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authorLinus Torvalds2022-03-22 17:03:12 -0700
committerLinus Torvalds2022-03-22 17:03:12 -0700
commit9030fb0bb9d607908d51f9ee02efdbe01da355ee (patch)
tree9ee1d9d47fbb4b30c7f5cbc291432e666e58967a /mm
parent3bf03b9a0839c9fb06927ae53ebd0f960b19d408 (diff)
parent2a3c4bce3edb0d54983384aa8a88c0da330638f4 (diff)
Merge tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache
Pull folio updates from Matthew Wilcox: - Rewrite how munlock works to massively reduce the contention on i_mmap_rwsem (Hugh Dickins): https://lore.kernel.org/linux-mm/8e4356d-9622-a7f0-b2c-f116b5f2efea@google.com/ - Sort out the page refcount mess for ZONE_DEVICE pages (Christoph Hellwig): https://lore.kernel.org/linux-mm/20220210072828.2930359-1-hch@lst.de/ - Convert GUP to use folios and make pincount available for order-1 pages. (Matthew Wilcox) - Convert a few more truncation functions to use folios (Matthew Wilcox) - Convert page_vma_mapped_walk to use PFNs instead of pages (Matthew Wilcox) - Convert rmap_walk to use folios (Matthew Wilcox) - Convert most of shrink_page_list() to use a folio (Matthew Wilcox) - Add support for creating large folios in readahead (Matthew Wilcox) * tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache: (114 commits) mm/damon: minor cleanup for damon_pa_young selftests/vm/transhuge-stress: Support file-backed PMD folios mm/filemap: Support VM_HUGEPAGE for file mappings mm/readahead: Switch to page_cache_ra_order mm/readahead: Align file mappings for non-DAX mm/readahead: Add large folio readahead mm: Support arbitrary THP sizes mm: Make large folios depend on THP mm: Fix READ_ONLY_THP warning mm/filemap: Allow large folios to be added to the page cache mm: Turn can_split_huge_page() into can_split_folio() mm/vmscan: Convert pageout() to take a folio mm/vmscan: Turn page_check_references() into folio_check_references() mm/vmscan: Account large folios correctly mm/vmscan: Optimise shrink_page_list for non-PMD-sized folios mm/vmscan: Free non-shmem folios without splitting them mm/rmap: Constify the rmap_walk_control argument mm/rmap: Convert rmap_walk() to take a folio mm: Turn page_anon_vma() into folio_anon_vma() mm/rmap: Turn page_lock_anon_vma_read() into folio_lock_anon_vma_read() ...
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig7
-rw-r--r--mm/Makefile1
-rw-r--r--mm/damon/paddr.c62
-rw-r--r--mm/debug.c18
-rw-r--r--mm/filemap.c59
-rw-r--r--mm/folio-compat.c13
-rw-r--r--mm/gup.c486
-rw-r--r--mm/huge_memory.c178
-rw-r--r--mm/hugetlb.c15
-rw-r--r--mm/internal.h117
-rw-r--r--mm/khugepaged.c15
-rw-r--r--mm/ksm.c32
-rw-r--r--mm/madvise.c5
-rw-r--r--mm/memcontrol.c37
-rw-r--r--mm/memory-failure.c12
-rw-r--r--mm/memory.c43
-rw-r--r--mm/memory_hotplug.c13
-rw-r--r--mm/memremap.c65
-rw-r--r--mm/migrate.c870
-rw-r--r--mm/migrate_device.c773
-rw-r--r--mm/mlock.c638
-rw-r--r--mm/mmap.c32
-rw-r--r--mm/mmzone.c7
-rw-r--r--mm/oom_kill.c2
-rw-r--r--mm/page_alloc.c3
-rw-r--r--mm/page_idle.c30
-rw-r--r--mm/page_vma_mapped.c58
-rw-r--r--mm/readahead.c108
-rw-r--r--mm/rmap.c578
-rw-r--r--mm/swap.c173
-rw-r--r--mm/truncate.c111
-rw-r--r--mm/userfaultfd.c14
-rw-r--r--mm/util.c36
-rw-r--r--mm/vmscan.c305
-rw-r--r--mm/workingset.c25
35 files changed, 2370 insertions, 2571 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 5ffb79162a72..761f5021ba51 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -249,6 +249,9 @@ config MIGRATION
pages as migration can relocate pages to satisfy a huge page
allocation instead of reclaiming.
+config DEVICE_MIGRATION
+ def_bool MIGRATION && ZONE_DEVICE
+
config ARCH_ENABLE_HUGEPAGE_MIGRATION
bool
@@ -791,9 +794,6 @@ config ZONE_DEVICE
If FS_DAX is enabled, then say Y.
-config DEV_PAGEMAP_OPS
- bool
-
#
# Helpers to mirror range of the CPU page tables of a process into device page
# tables.
@@ -805,7 +805,6 @@ config HMM_MIRROR
config DEVICE_PRIVATE
bool "Unaddressable device memory (GPU memory, ...)"
depends on ZONE_DEVICE
- select DEV_PAGEMAP_OPS
help
Allows creation of struct pages to represent unaddressable device
diff --git a/mm/Makefile b/mm/Makefile
index 70d4309c9ce3..4cc13f3179a5 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_KFENCE) += kfence/
obj-$(CONFIG_FAILSLAB) += failslab.o
obj-$(CONFIG_MEMTEST) += memtest.o
obj-$(CONFIG_MIGRATION) += migrate.o
+obj-$(CONFIG_DEVICE_MIGRATION) += migrate_device.o
obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o khugepaged.o
obj-$(CONFIG_PAGE_COUNTER) += page_counter.o
obj-$(CONFIG_MEMCG) += memcontrol.o vmpressure.o
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 7c263797a9a9..21474ae63bc7 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -16,14 +16,10 @@
#include "../internal.h"
#include "ops-common.h"
-static bool __damon_pa_mkold(struct page *page, struct vm_area_struct *vma,
+static bool __damon_pa_mkold(struct folio *folio, struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = addr,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
while (page_vma_mapped_walk(&pvmw)) {
addr = pvmw.address;
@@ -37,32 +33,34 @@ static bool __damon_pa_mkold(struct page *page, struct vm_area_struct *vma,
static void damon_pa_mkold(unsigned long paddr)
{
+ struct folio *folio;
struct page *page = damon_get_page(PHYS_PFN(paddr));
struct rmap_walk_control rwc = {
.rmap_one = __damon_pa_mkold,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
};
bool need_lock;
if (!page)
return;
+ folio = page_folio(page);
- if (!page_mapped(page) || !page_rmapping(page)) {
- set_page_idle(page);
+ if (!folio_mapped(folio) || !folio_raw_mapping(folio)) {
+ folio_set_idle(folio);
goto out;
}
- need_lock = !PageAnon(page) || PageKsm(page);
- if (need_lock && !trylock_page(page))
+ need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
+ if (need_lock && !folio_trylock(folio))
goto out;
- rmap_walk(page, &rwc);
+ rmap_walk(folio, &rwc);
if (need_lock)
- unlock_page(page);
+ folio_unlock(folio);
out:
- put_page(page);
+ folio_put(folio);
}
static void __damon_pa_prepare_access_check(struct damon_ctx *ctx,
@@ -89,15 +87,11 @@ struct damon_pa_access_chk_result {
bool accessed;
};
-static bool __damon_pa_young(struct page *page, struct vm_area_struct *vma,
+static bool __damon_pa_young(struct folio *folio, struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
struct damon_pa_access_chk_result *result = arg;
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = addr,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
result->accessed = false;
result->page_sz = PAGE_SIZE;
@@ -105,12 +99,12 @@ static bool __damon_pa_young(struct page *page, struct vm_area_struct *vma,
addr = pvmw.address;
if (pvmw.pte) {
result->accessed = pte_young(*pvmw.pte) ||
- !page_is_idle(page) ||
+ !folio_test_idle(folio) ||
mmu_notifier_test_young(vma->vm_mm, addr);
} else {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
result->accessed = pmd_young(*pvmw.pmd) ||
- !page_is_idle(page) ||
+ !folio_test_idle(folio) ||
mmu_notifier_test_young(vma->vm_mm, addr);
result->page_sz = ((1UL) << HPAGE_PMD_SHIFT);
#else
@@ -129,6 +123,7 @@ static bool __damon_pa_young(struct page *page, struct vm_area_struct *vma,
static bool damon_pa_young(unsigned long paddr, unsigned long *page_sz)
{
+ struct folio *folio;
struct page *page = damon_get_page(PHYS_PFN(paddr));
struct damon_pa_access_chk_result result = {
.page_sz = PAGE_SIZE,
@@ -137,33 +132,34 @@ static bool damon_pa_young(unsigned long paddr, unsigned long *page_sz)
struct rmap_walk_control rwc = {
.arg = &result,
.rmap_one = __damon_pa_young,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
};
bool need_lock;
if (!page)
return false;
+ folio = page_folio(page);
- if (!page_mapped(page) || !page_rmapping(page)) {
- if (page_is_idle(page))
+ if (!folio_mapped(folio) || !folio_raw_mapping(folio)) {
+ if (folio_test_idle(folio))
result.accessed = false;
else
result.accessed = true;
- put_page(page);
+ folio_put(folio);
goto out;
}
- need_lock = !PageAnon(page) || PageKsm(page);
- if (need_lock && !trylock_page(page)) {
- put_page(page);
- return NULL;
+ need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
+ if (need_lock && !folio_trylock(folio)) {
+ folio_put(folio);
+ return false;
}
- rmap_walk(page, &rwc);
+ rmap_walk(folio, &rwc);
if (need_lock)
- unlock_page(page);
- put_page(page);
+ folio_unlock(folio);
+ folio_put(folio);
out:
*page_sz = result.page_sz;
diff --git a/mm/debug.c b/mm/debug.c
index bc9ac87f0e08..eeb7ea3ca292 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -48,7 +48,8 @@ const struct trace_print_flags vmaflag_names[] = {
static void __dump_page(struct page *page)
{
- struct page *head = compound_head(page);
+ struct folio *folio = page_folio(page);
+ struct page *head = &folio->page;
struct address_space *mapping;
bool compound = PageCompound(page);
/*
@@ -76,6 +77,7 @@ static void __dump_page(struct page *page)
else
mapping = (void *)(tmp & ~PAGE_MAPPING_FLAGS);
head = page;
+ folio = (struct folio *)page;
compound = false;
} else {
mapping = page_mapping(page);
@@ -92,16 +94,10 @@ static void __dump_page(struct page *page)
page, page_ref_count(head), mapcount, mapping,
page_to_pgoff(page), page_to_pfn(page));
if (compound) {
- if (hpage_pincount_available(page)) {
- pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
- head, compound_order(head),
- head_compound_mapcount(head),
- head_compound_pincount(head));
- } else {
- pr_warn("head:%p order:%u compound_mapcount:%d\n",
- head, compound_order(head),
- head_compound_mapcount(head));
- }
+ pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
+ head, compound_order(head),
+ folio_entire_mapcount(folio),
+ head_compound_pincount(head));
}
#ifdef CONFIG_MEMCG
diff --git a/mm/filemap.c b/mm/filemap.c
index bd788bbe41b0..1752ef1266f3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -842,26 +842,27 @@ noinline int __filemap_add_folio(struct address_space *mapping,
{
XA_STATE(xas, &mapping->i_pages, index);
int huge = folio_test_hugetlb(folio);
- int error;
bool charged = false;
+ long nr = 1;
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
VM_BUG_ON_FOLIO(folio_test_swapbacked(folio), folio);
mapping_set_update(&xas, mapping);
- folio_get(folio);
- folio->mapping = mapping;
- folio->index = index;
-
if (!huge) {
- error = mem_cgroup_charge(folio, NULL, gfp);
+ int error = mem_cgroup_charge(folio, NULL, gfp);
VM_BUG_ON_FOLIO(index & (folio_nr_pages(folio) - 1), folio);
if (error)
- goto error;
+ return error;
charged = true;
+ xas_set_order(&xas, index, folio_order(folio));
+ nr = folio_nr_pages(folio);
}
gfp &= GFP_RECLAIM_MASK;
+ folio_ref_add(folio, nr);
+ folio->mapping = mapping;
+ folio->index = xas.xa_index;
do {
unsigned int order = xa_get_order(xas.xa, xas.xa_index);
@@ -885,6 +886,8 @@ noinline int __filemap_add_folio(struct address_space *mapping,
/* entry may have been split before we acquired lock */
order = xa_get_order(xas.xa, xas.xa_index);
if (order > folio_order(folio)) {
+ /* How to handle large swap entries? */
+ BUG_ON(shmem_mapping(mapping));
xas_split(&xas, old, order);
xas_reset(&xas);
}
@@ -894,29 +897,31 @@ noinline int __filemap_add_folio(struct address_space *mapping,
if (xas_error(&xas))
goto unlock;
- mapping->nrpages++;
+ mapping->nrpages += nr;
/* hugetlb pages do not participate in page cache accounting */
- if (!huge)
- __lruvec_stat_add_folio(folio, NR_FILE_PAGES);
+ if (!huge) {
+ __lruvec_stat_mod_folio(folio, NR_FILE_PAGES, nr);
+ if (folio_test_pmd_mappable(folio))
+ __lruvec_stat_mod_folio(folio,
+ NR_FILE_THPS, nr);
+ }
unlock:
xas_unlock_irq(&xas);
} while (xas_nomem(&xas, gfp));
- if (xas_error(&xas)) {
- error = xas_error(&xas);
- if (charged)
- mem_cgroup_uncharge(folio);
+ if (xas_error(&xas))
goto error;
- }
trace_mm_filemap_add_to_page_cache(folio);
return 0;
error:
+ if (charged)
+ mem_cgroup_uncharge(folio);
folio->mapping = NULL;
/* Leave page->index set: truncation relies upon it */
- folio_put(folio);
- return error;
+ folio_put_refs(folio, nr);
+ return xas_error(&xas);
}
ALLOW_ERROR_INJECTION(__filemap_add_folio, ERRNO);
@@ -2997,6 +3002,24 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf)
struct file *fpin = NULL;
unsigned int mmap_miss;
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ /* Use the readahead code, even if readahead is disabled */
+ if (vmf->vma->vm_flags & VM_HUGEPAGE) {
+ fpin = maybe_unlock_mmap_for_io(vmf, fpin);
+ ractl._index &= ~((unsigned long)HPAGE_PMD_NR - 1);
+ ra->size = HPAGE_PMD_NR;
+ /*
+ * Fetch two PMD folios, so we get the chance to actually
+ * readahead, unless we've been told not to.
+ */
+ if (!(vmf->vma->vm_flags & VM_RAND_READ))
+ ra->size *= 2;
+ ra->async_size = HPAGE_PMD_NR;
+ page_cache_ra_order(&ractl, ra, HPAGE_PMD_ORDER);
+ return fpin;
+ }
+#endif
+
/* If we don't want any read-ahead, don't bother */
if (vmf->vma->vm_flags & VM_RAND_READ)
return fpin;
@@ -3029,7 +3052,7 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf)
ra->size = ra->ra_pages;
ra->async_size = ra->ra_pages / 4;
ractl._index = ra->start;
- do_page_cache_ra(&ractl, ra->size, ra->async_size);
+ page_cache_ra_order(&ractl, ra, 0);
return fpin;
}
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index 749555a232a8..46fa179e32fb 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -7,6 +7,7 @@
#include <linux/migrate.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
+#include "internal.h"
struct address_space *page_mapping(struct page *page)
{
@@ -151,3 +152,15 @@ int try_to_release_page(struct page *page, gfp_t gfp)
return filemap_release_folio(page_folio(page), gfp);
}
EXPORT_SYMBOL(try_to_release_page);
+
+int isolate_lru_page(struct page *page)
+{
+ if (WARN_RATELIMIT(PageTail(page), "trying to isolate tail page"))
+ return -EBUSY;
+ return folio_isolate_lru((struct folio *)page);
+}
+
+void putback_lru_page(struct page *page)
+{
+ folio_putback_lru(page_folio(page));
+}
diff --git a/mm/gup.c b/mm/gup.c
index 85d59dc08644..271fbe8195d7 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -29,107 +29,71 @@ struct follow_page_context {
unsigned int page_mask;
};
-static void hpage_pincount_add(struct page *page, int refs)
-{
- VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
- VM_BUG_ON_PAGE(page != compound_head(page), page);
-
- atomic_add(refs, compound_pincount_ptr(page));
-}
-
-static void hpage_pincount_sub(struct page *page, int refs)
-{
- VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
- VM_BUG_ON_PAGE(page != compound_head(page), page);
-
- atomic_sub(refs, compound_pincount_ptr(page));
-}
-
-/* Equivalent to calling put_page() @refs times. */
-static void put_page_refs(struct page *page, int refs)
-{
-#ifdef CONFIG_DEBUG_VM
- if (VM_WARN_ON_ONCE_PAGE(page_ref_count(page) < refs, page))
- return;
-#endif
-
- /*
- * Calling put_page() for each ref is unnecessarily slow. Only the last
- * ref needs a put_page().
- */
- if (refs > 1)
- page_ref_sub(page, refs - 1);
- put_page(page);
-}
-
/*
- * Return the compound head page with ref appropriately incremented,
+ * Return the folio with ref appropriately incremented,
* or NULL if that failed.
*/
-static inline struct page *try_get_compound_head(struct page *page, int refs)
+static inline struct folio *try_get_folio(struct page *page, int refs)
{
- struct page *head = compound_head(page);
+ struct folio *folio;
- if (WARN_ON_ONCE(page_ref_count(head) < 0))
+retry:
+ folio = page_folio(page);
+ if (WARN_ON_ONCE(folio_ref_count(folio) < 0))
return NULL;
- if (unlikely(!page_cache_add_speculative(head, refs)))
+ if (unlikely(!folio_ref_try_add_rcu(folio, refs)))
return NULL;
/*
- * At this point we have a stable reference to the head page; but it
- * could be that between the compound_head() lookup and the refcount
- * increment, the compound page was split, in which case we'd end up
- * holding a reference on a page that has nothing to do with the page
+ * At this point we have a stable reference to the folio; but it
+ * could be that between calling page_folio() and the refcount
+ * increment, the folio was split, in which case we'd end up
+ * holding a reference on a folio that has nothing to do with the page
* we were given anymore.
- * So now that the head page is stable, recheck that the pages still
- * belong together.
+ * So now that the folio is stable, recheck that the page still
+ * belongs to this folio.
*/
- if (unlikely(compound_head(page) != head)) {
- put_page_refs(head, refs);
- return NULL;
+ if (unlikely(page_folio(page) != folio)) {
+ folio_put_refs(folio, refs);
+ goto retry;
}
- return head;
+ return folio;
}
/**
- * try_grab_compound_head() - attempt to elevate a page's refcount, by a
- * flags-dependent amount.
- *
- * Even though the name includes "compound_head", this function is still
- * appropriate for callers that have a non-compound @page to get.
- *
+ * try_grab_folio() - Attempt to get or pin a folio.
* @page: pointer to page to be grabbed
- * @refs: the value to (effectively) add to the page's refcount
+ * @refs: the value to (effectively) add to the folio's refcount
* @flags: gup flags: these are the FOLL_* flag values.
*
* "grab" names in this file mean, "look at flags to decide whether to use
- * FOLL_PIN or FOLL_GET behavior, when incrementing the page's refcount.
+ * FOLL_PIN or FOLL_GET behavior, when incrementing the folio's refcount.
*
* Either FOLL_PIN or FOLL_GET (or neither) must be set, but not both at the
* same time. (That's true throughout the get_user_pages*() and
* pin_user_pages*() APIs.) Cases:
*
- * FOLL_GET: page's refcount will be incremented by @refs.
+ * FOLL_GET: folio's refcount will be incremented by @refs.
*
- * FOLL_PIN on compound pages that are > two pages long: page's refcount will
- * be incremented by @refs, and page[2].hpage_pinned_refcount will be
- * incremented by @refs * GUP_PIN_COUNTING_BIAS.
+ * FOLL_PIN on large folios: folio's refcount will be incremented by
+ * @refs, and its compound_pincount will be incremented by @refs.
*
- * FOLL_PIN on normal pages, or compound pages that are two pages long:
- * page's refcount will be incremented by @refs * GUP_PIN_COUNTING_BIAS.
+ * FOLL_PIN on single-page folios: folio's refcount will be incremented by
+ * @refs * GUP_PIN_COUNTING_BIAS.
*
- * Return: head page (with refcount appropriately incremented) for success, or
- * NULL upon failure. If neither FOLL_GET nor FOLL_PIN was set, that's
- * considered failure, and furthermore, a likely bug in the caller, so a warning
- * is also emitted.
+ * Return: The folio containing @page (with refcount appropriately
+ * incremented) for success, or NULL upon failure. If neither FOLL_GET
+ * nor FOLL_PIN was set, that's considered failure, and furthermore,
+ * a likely bug in the caller, so a warning is also emitted.
*/
-__maybe_unused struct page *try_grab_compound_head(struct page *page,
- int refs, unsigned int flags)
+struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags)
{
if (flags & FOLL_GET)
- return try_get_compound_head(page, refs);
+ return try_get_folio(page, refs);
else if (flags & FOLL_PIN) {
+ struct folio *folio;
+
/*
* Can't do FOLL_LONGTERM + FOLL_PIN gup fast path if not in a
* right zone, so fail and let the caller fall back to the slow
@@ -143,63 +107,57 @@ __maybe_unused struct page *try_grab_compound_head(struct page *page,
* CAUTION: Don't use compound_head() on the page before this
* point, the result won't be stable.
*/
- page = try_get_compound_head(page, refs);
- if (!page)
+ folio = try_get_folio(page, refs);
+ if (!folio)
return NULL;
/*
- * When pinning a compound page of order > 1 (which is what
- * hpage_pincount_available() checks for), use an exact count to
- * track it, via hpage_pincount_add/_sub().
+ * When pinning a large folio, use an exact count to track it.
*
- * However, be sure to *also* increment the normal page refcount
- * field at least once, so that the page really is pinned.
- * That's why the refcount from the earlier
- * try_get_compound_head() is left intact.
+ * However, be sure to *also* increment the normal folio
+ * refcount field at least once, so that the folio really
+ * is pinned. That's why the refcount from the earlier
+ * try_get_folio() is left intact.
*/
- if (hpage_pincount_available(page))
- hpage_pincount_add(page, refs);
+ if (folio_test_large(folio))
+ atomic_add(refs, folio_pincount_ptr(folio));
else
- page_ref_add(page, refs * (GUP_PIN_COUNTING_BIAS - 1));
-
- mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_ACQUIRED,
- refs);
+ folio_ref_add(folio,
+ refs * (GUP_PIN_COUNTING_BIAS - 1));
+ node_stat_mod_folio(folio, NR_FOLL_PIN_ACQUIRED, refs);
- return page;
+ return folio;
}
WARN_ON_ONCE(1);
return NULL;
}
-static void put_compound_head(struct page *page, int refs, unsigned int flags)
+static void gup_put_folio(struct folio *folio, int refs, unsigned int flags)
{
if (flags & FOLL_PIN) {
- mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_RELEASED,
- refs);
-
- if (hpage_pincount_available(page))
- hpage_pincount_sub(page, refs);
+ node_stat_mod_folio(folio, NR_FOLL_PIN_RELEASED, refs);
+ if (folio_test_large(folio))
+ atomic_sub(refs, folio_pincount_ptr(folio));
else
refs *= GUP_PIN_COUNTING_BIAS;
}
- put_page_refs(page, refs);
+ folio_put_refs(folio, refs);
}
/**
* try_grab_page() - elevate a page's refcount by a flag-dependent amount
+ * @page: pointer to page to be grabbed
+ * @flags: gup flags: these are the FOLL_* flag values.
*
* This might not do anything at all, depending on the flags argument.
*
* "grab" names in this file mean, "look at flags to decide whether to use
* FOLL_PIN or FOLL_GET behavior, when incrementing the page's refcount.
*
- * @page: pointer to page to be grabbed
- * @flags: gup flags: these are the FOLL_* flag values.
- *
* Either FOLL_PIN or FOLL_GET (or neither) may be set, but not both at the same
- * time. Cases: please see the try_grab_compound_head() documentation, with
+ * time. Cases: please see the try_grab_folio() documentation, with
* "refs=1".
*
* Return: true for success, or if no action was required (if neither FOLL_PIN
@@ -208,32 +166,28 @@ static void put_compound_head(struct page *page, int refs, unsigned int flags)
*/
bool __must_check try_grab_page(struct page *page, unsigned int flags)
{
+ struct folio *folio = page_folio(page);
+
WARN_ON_ONCE((flags & (FOLL_GET | FOLL_PIN)) == (FOLL_GET | FOLL_PIN));
+ if (WARN_ON_ONCE(folio_ref_count(folio) <= 0))
+ return false;
if (flags & FOLL_GET)
- return try_get_page(page);
+ folio_ref_inc(folio);
else if (flags & FOLL_PIN) {
- int refs = 1;
-
- page = compound_head(page);
-
- if (WARN_ON_ONCE(page_ref_count(page) <= 0))
- return false;
-
- if (hpage_pincount_available(page))
- hpage_pincount_add(page, 1);
- else
- refs = GUP_PIN_COUNTING_BIAS;
-
/*
- * Similar to try_grab_compound_head(): even if using the
- * hpage_pincount_add/_sub() routines, be sure to
- * *also* increment the normal page refcount field at least
- * once, so that the page really is pinned.
+ * Similar to try_grab_folio(): be sure to *also*
+ * increment the normal page refcount field at least once,
+ * so that the page really is pinned.
*/
- page_ref_add(page, refs);
+ if (folio_test_large(folio)) {
+ folio_ref_add(folio, 1);
+ atomic_add(1, folio_pincount_ptr(folio));
+ } else {
+ folio_ref_add(folio, GUP_PIN_COUNTING_BIAS);
+ }
- mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_ACQUIRED, 1);
+ node_stat_mod_folio(folio, NR_FOLL_PIN_ACQUIRED, 1);
}
return true;
@@ -250,62 +204,40 @@ bool __must_check try_grab_page(struct page *page, unsigned int flags)
*/
void unpin_user_page(struct page *page)
{
- put_compound_head(compound_head(page), 1, FOLL_PIN);
+ gup_put_folio(page_folio(page), 1, FOLL_PIN);
}
EXPORT_SYMBOL(unpin_user_page);
-static inline void compound_range_next(unsigned long i, unsigned long npages,
- struct page **list, struct page **head,
- unsigned int *ntails)
+static inline struct folio *gup_folio_range_next(struct page *start,
+ unsigned long npages, unsigned long i, unsigned int *ntails)
{
- struct page *next, *page;
+ struct page *next = nth_page(start, i);
+ struct folio *folio = page_folio(next);
unsigned int nr = 1;
- if (i >= npages)
- return;
-
- next = *list + i;
- page = compound_head(next);
- if (PageCompound(page) && compound_order(page) >= 1)
- nr = min_t(unsigned int,
- page + compound_nr(page) - next, npages - i);
+ if (folio_test_large(folio))
+ nr = min_t(unsigned int, npages - i,
+ folio_nr_pages(folio) - folio_page_idx(folio, next));
- *head = page;
*ntails = nr;
+ return folio;
}
-#define for_each_compound_range(__i, __list, __npages, __head, __ntails) \
- for (__i = 0, \
- compound_range_next(__i, __npages, __list, &(__head), &(__ntails)); \
- __i < __npages; __i += __ntails, \
- compound_range_next(__i, __npages, __list, &(__head), &(__ntails)))
-
-static inline void compound_next(unsigned long i, unsigned long npages,
- struct page **list, struct page **head,
- unsigned int *ntails)
+static inline struct folio *gup_folio_next(struct page **list,
+ unsigned long npages, unsigned long i, unsigned int *ntails)
{
- struct page *page;
+ struct folio *folio = page_folio(list[i]);
unsigned int nr;
- if (i >= npages)
- return;
-
- page = compound_head(list[i]);
for (nr = i + 1; nr < npages; nr++) {
- if (compound_head(list[nr]) != page)
+ if (page_folio(list[nr]) != folio)
break;
}
- *head = page;
*ntails = nr - i;
+ return folio;
}
-#define for_each_compound_head(__i, __list, __npages, __head, __ntails) \
- for (__i = 0, \
- compound_next(__i, __npages, __list, &(__head), &(__ntails)); \
- __i < __npages; __i += __ntails, \
- compound_next(__i, __npages, __list, &(__head), &(__ntails)))
-
/**
* unpin_user_pages_dirty_lock() - release and optionally dirty gup-pinned pages
* @pages: array of pages to be maybe marked dirty, and definitely released.
@@ -331,16 +263,17 @@ static inline void compound_next(unsigned long i, unsigned long npages,
void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
bool make_dirty)
{
- unsigned long index;
- struct page *head;
- unsigned int ntails;
+ unsigned long i;
+ struct folio *folio;
+ unsigned int nr;
if (!make_dirty) {
unpin_user_pages(pages, npages);
return;
}
- for_each_compound_head(index, pages, npages, head, ntails) {
+ for (i = 0; i < npages; i += nr) {
+ folio = gup_folio_next(pages, npages, i, &nr);
/*
* Checking PageDirty at this point may race with
* clear_page_dirty_for_io(), but that's OK. Two key
@@ -361,9 +294,12 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
* written back, so it gets written back again in the
* next writeback cycle. This is harmless.
*/
- if (!PageDirty(head))
- set_page_dirty_lock(head);
- put_compound_head(head, ntails, FOLL_PIN);
+ if (!folio_test_dirty(folio)) {
+ folio_lock(folio);
+ folio_mark_dirty(folio);
+ folio_unlock(folio);
+ }
+ gup_put_folio(folio, nr, FOLL_PIN);
}
}
EXPORT_SYMBOL(unpin_user_pages_dirty_lock);
@@ -392,14 +328,18 @@ EXPORT_SYMBOL(unpin_user_pages_dirty_lock);
void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages,
bool make_dirty)
{
- unsigned long index;
- struct page *head;
- unsigned int ntails;
+ unsigned long i;
+ struct folio *folio;
+ unsigned int nr;
- for_each_compound_range(index, &page, npages, head, ntails) {
- if (make_dirty && !PageDirty(head))
- set_page_dirty_lock(head);
- put_compound_head(head, ntails, FOLL_PIN);
+ for (i = 0; i < npages; i += nr) {
+ folio = gup_folio_range_next(page, npages, i, &nr);
+ if (make_dirty && !folio_test_dirty(folio)) {
+ folio_lock(folio);
+ folio_mark_dirty(folio);
+ folio_unlock(folio);
+ }
+ gup_put_folio(folio, nr, FOLL_PIN);
}
}
EXPORT_SYMBOL(unpin_user_page_range_dirty_lock);
@@ -415,9 +355,9 @@ EXPORT_SYMBOL(unpin_user_page_range_dirty_lock);
*/
void unpin_user_pages(struct page **pages, unsigned long npages)
{
- unsigned long index;
- struct page *head;
- unsigned int ntails;
+ unsigned long i;
+ struct folio *folio;
+ unsigned int nr;
/*
* If this WARN_ON() fires, then the system *might* be leaking pages (by
@@ -427,8 +367,10 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
if (WARN_ON(IS_ERR_VALUE(npages)))
return;
- for_each_compound_head(index, pages, npages, head, ntails)
- put_compound_head(head, ntails, FOLL_PIN);
+ for (i = 0; i < npages; i += nr) {
+ folio = gup_folio_next(pages, npages, i, &nr);
+ gup_put_folio(folio, nr, FOLL_PIN);
+ }
}
EXPORT_SYMBOL(unpin_user_pages);
@@ -593,32 +535,6 @@ retry:
*/
mark_page_accessed(page);
}
- if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
- /* Do not mlock pte-mapped THP */
- if (PageTransCompound(page))
- goto out;
-
- /*
- * The preliminary mapping check is mainly to avoid the
- * pointless overhead of lock_page on the ZERO_PAGE
- * which might bounce very badly if there is contention.
- *
- * If the page is already locked, we don't need to
- * handle it now - vmscan will handle it later if and
- * when it attempts to reclaim the page.
- */
- if (page->mapping && trylock_page(page)) {
- lru_add_drain(); /* push cached pages to LRU */
- /*
- * Because we lock page here, and migration is
- * blocked by the pte's page reference, and we
- * know the page is still mapped, we don't even
- * need to check for file-cache page truncation.
- */
- mlock_vma_page(page);
- unlock_page(page);
- }
- }
out:
pte_unmap_unlock(ptep, ptl);
return page;
@@ -941,9 +857,6 @@ static int faultin_page(struct vm_area_struct *vma,
unsigned int fault_flags = 0;
vm_fault_t ret;
- /* mlock all present pages, but do not fault in new pages */
- if ((*flags & (FOLL_POPULATE | FOLL_MLOCK)) == FOLL_MLOCK)
- return -ENOENT;
if (*flags & FOLL_NOFAULT)
return -EFAULT;
if (*flags & FOLL_WRITE)
@@ -1194,8 +1107,6 @@ retry:
case -ENOMEM:
case -EHWPOISON:
goto out;
- case -ENOENT:
- goto next_page;
}
BUG();
} else if (PTR_ERR(page) == -EEXIST) {
@@ -1500,9 +1411,14 @@ long populate_vma_page_range(struct vm_area_struct *vma,
VM_BUG_ON_VMA(end > vma->vm_end, vma);
mmap_assert_locked(mm);
- gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK;
+ /*
+ * Rightly or wrongly, the VM_LOCKONFAULT case has never used
+ * faultin_page() to break COW, so it has no work to do here.
+ */
if (vma->vm_flags & VM_LOCKONFAULT)
- gup_flags &= ~FOLL_POPULATE;
+ return nr_pages;
+
+ gup_flags = FOLL_TOUCH;
/*
* We want to touch writable mappings with a write fault in order
* to break COW, except for shared mappings because these don't COW
@@ -1569,10 +1485,9 @@ long faultin_vma_page_range(struct vm_area_struct *vma, unsigned long start,
* in the page table.
* FOLL_HWPOISON: Return -EHWPOISON instead of -EFAULT when we hit
* a poisoned page.
- * FOLL_POPULATE: Always populate memory with VM_LOCKONFAULT.
* !FOLL_FORCE: Require proper access permissions.
*/
- gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK | FOLL_HWPOISON;
+ gup_flags = FOLL_TOUCH | FOLL_HWPOISON;
if (write)
gup_flags |= FOLL_WRITE;
@@ -1852,72 +1767,80 @@ static long check_and_migrate_movable_pages(unsigned long nr_pages,
struct page **pages,
unsigned int gup_flags)
{
- unsigned long i;
- unsigned long isolation_error_count = 0;
- bool drain_allow = true;
+ unsigned long isolation_error_count = 0, i;
+ struct folio *prev_folio = NULL;
LIST_HEAD(movable_page_list);
- long ret = 0;
- struct page *prev_head = NULL;
- struct page *head;
- struct migration_target_control mtc = {
- .nid = NUMA_NO_NODE,
- .gfp_mask = GFP_USER | __GFP_NOWARN,
- };
+ bool drain_allow = true;
+ int ret = 0;
for (i = 0; i < nr_pages; i++) {
- head = compound_head(pages[i]);
- if (head == prev_head)
+ struct folio *folio = page_folio(pages[i]);
+
+ if (folio == prev_folio)
continue;
- prev_head = head;
+ prev_folio = folio;
+
+ if (folio_is_pinnable(folio))
+ continue;
+
/*
- * If we get a movable page, since we are going to be pinning
- * these entries, try to move them out if possible.
+ * Try to move out any movable page before pinning the range.
*/
- if (!is_pinnable_page(head)) {
- if (PageHuge(head)) {
- if (!isolate_huge_page(head, &movable_page_list))
- isolation_error_count++;
- } else {
- if (!PageLRU(head) && drain_allow) {
- lru_add_drain_all();
- drain_allow = false;
- }
+ if (folio_test_hugetlb(folio)) {
+ if (!isolate_huge_page(&folio->page,
+ &movable_page_list))
+ isolation_error_count++;
+ continue;
+ }
- if (isolate_lru_page(head)) {
- isolation_error_count++;
- continue;
- }
- list_add_tail(&head->lru, &movable_page_list);
- mod_node_page_state(page_pgdat(head),
- NR_ISOLATED_ANON +
- page_is_file_lru(head),
- thp_nr_pages(head));
- }
+ if (!folio_test_lru(folio) && drain_allow) {
+ lru_add_drain_all();
+ drain_allow = false;
+ }
+
+ if (folio_isolate_lru(folio)) {
+ isolation_error_count++;
+ continue;
}
+ list_add_tail(&folio->lru, &movable_page_list);
+ node_stat_mod_folio(folio,
+ NR_ISOLATED_ANON + folio_is_file_lru(folio),
+ folio_nr_pages(folio));
}
+ if (!list_empty(&movable_page_list) || isolation_error_count)
+ goto unpin_pages;
+
/*
* If list is empty, and no isolation errors, means that all pages are
* in the correct zone.
*/
- if (list_empty(&movable_page_list) && !isolation_error_count)
- return nr_pages;
+ return nr_pages;
+unpin_pages:
if (gup_flags & FOLL_PIN) {
unpin_user_pages(pages, nr_pages);
} else {
for (i = 0; i < nr_pages; i++)
put_page(pages[i]);
}
+
if (!list_empty(&movable_page_list)) {
+ struct migration_target_control mtc = {
+ .nid = NUMA_NO_NODE,
+ .gfp_mask = GFP_USER | __GFP_NOWARN,
+ };
+
ret = migrate_pages(&movable_page_list, alloc_migration_target,
NULL, (unsigned long)&mtc, MIGRATE_SYNC,
MR_LONGTERM_PIN, NULL);
- if (ret && !list_empty(&movable_page_list))
- putback_movable_pages(&movable_page_list);
+ if (ret > 0) /* number of pages not migrated */
+ ret = -ENOMEM;
}
- return ret > 0 ? -ENOMEM : ret;
+ if (ret && !list_empty(&movable_page_list))
+ putback_movable_pages(&movable_page_list);
+ return ret;
}
#else
static long check_and_migrate_movable_pages(unsigned long nr_pages,
@@ -2227,7 +2150,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
ptem = ptep = pte_offset_map(&pmd, addr);
do {
pte_t pte = ptep_get_lockless(ptep);
- struct page *head, *page;
+ struct page *page;
+ struct folio *folio;
/*
* Similar to the PMD case below, NUMA hinting must take slow
@@ -2254,22 +2178,20 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
page = pte_page(pte);
- head = try_grab_compound_head(page, 1, flags);
- if (!head)
+ folio = try_grab_folio(page, 1, flags);
+ if (!folio)
goto pte_unmap;
if (unlikely(page_is_secretmem(page))) {
- put_compound_head(head, 1, flags);
+ gup_put_folio(folio, 1, flags);
goto pte_unmap;
}
if (unlikely(pte_val(pte) != pte_val(*ptep))) {
- put_compound_head(head, 1, flags);
+ gup_put_folio(folio, 1, flags);
goto pte_unmap;
}
- VM_BUG_ON_PAGE(compound_head(page) != head, page);
-
/*
* We need to make the page accessible if and only if we are
* going to access its content (the FOLL_PIN case). Please
@@ -2279,14 +2201,13 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
if (flags & FOLL_PIN) {
ret = arch_make_page_accessible(page);
if (ret) {
- unpin_user_page(page);
+ gup_put_folio(folio, 1, flags);
goto pte_unmap;
}
}
- SetPageReferenced(page);
+ folio_set_referenced(folio);
pages[*nr] = page;
(*nr)++;
-
} while (ptep++, addr += PAGE_SIZE, addr != end);
ret = 1;
@@ -2403,8 +2324,8 @@ static int record_subpages(struct page *page, unsigned long addr,
{
int nr;
- for (nr = 0; addr != end; addr += PAGE_SIZE)
- pages[nr++] = page++;
+ for (nr = 0; addr != end; nr++, addr += PAGE_SIZE)
+ pages[nr] = nth_page(page, nr);
return nr;
}
@@ -2422,7 +2343,8 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
struct page **pages, int *nr)
{
unsigned long pte_end;
- struct page *head, *page;
+ struct page *page;
+ struct folio *folio;
pte_t pte;
int refs;
@@ -2438,21 +2360,20 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
/* hugepages are never "special" */
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
- head = pte_page(pte);
- page = head + ((addr & (sz-1)) >> PAGE_SHIFT);
+ page = nth_page(pte_page(pte), (addr & (sz - 1)) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
- head = try_grab_compound_head(head, refs, flags);
- if (!head)
+ folio = try_grab_folio(page, refs, flags);
+ if (!folio)
return 0;
if (unlikely(pte_val(pte) != pte_val(*ptep))) {
- put_compound_head(head, refs, flags);
+ gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
- SetPageReferenced(head);
+ folio_set_referenced(folio);
return 1;
}
@@ -2486,7 +2407,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
unsigned long end, unsigned int flags,
struct page **pages, int *nr)
{
- struct page *head, *page;
+ struct page *page;
+ struct folio *folio;
int refs;
if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
@@ -2499,20 +2421,20 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
pages, nr);
}
- page = pmd_page(orig) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
+ page = nth_page(pmd_page(orig), (addr & ~PMD_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
- head = try_grab_compound_head(pmd_page(orig), refs, flags);
- if (!head)
+ folio = try_grab_folio(page, refs, flags);
+ if (!folio)
return 0;
if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) {
- put_compound_head(head, refs, flags);
+ gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
- SetPageReferenced(head);
+ folio_set_referenced(folio);
return 1;
}
@@ -2520,7 +2442,8 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
unsigned long end, unsigned int flags,
struct page **pages, int *nr)
{
- struct page *head, *page;
+ struct page *page;
+ struct folio *folio;
int refs;
if (!pud_access_permitted(orig, flags & FOLL_WRITE))
@@ -2533,20 +2456,20 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
pages, nr);
}
- page = pud_page(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
+ page = nth_page(pud_page(orig), (addr & ~PUD_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
- head = try_grab_compound_head(pud_page(orig), refs, flags);
- if (!head)
+ folio = try_grab_folio(page, refs, flags);
+ if (!folio)
return 0;
if (unlikely(pud_val(orig) != pud_val(*pudp))) {
- put_compound_head(head, refs, flags);
+ gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
- SetPageReferenced(head);
+ folio_set_referenced(folio);
return 1;
}
@@ -2555,27 +2478,28 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr,
struct page **pages, int *nr)
{
int refs;
- struct page *head, *page;
+ struct page *page;
+ struct folio *folio;
if (!pgd_access_permitted(orig, flags & FOLL_WRITE))
return 0;
BUILD_BUG_ON(pgd_devmap(orig));
- page = pgd_page(orig) + ((addr & ~PGDIR_MASK) >> PAGE_SHIFT);
+ page = nth_page(pgd_page(orig), (addr & ~PGDIR_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
- head = try_grab_compound_head(pgd_page(orig), refs, flags);
- if (!head)
+ folio = try_grab_folio(page, refs, flags);
+ if (!folio)
return 0;
if (unlikely(pgd_val(orig) != pgd_val(*pgdp))) {
- put_compound_head(head, refs, flags);
+ gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
- SetPageReferenced(head);
+ folio_set_referenced(folio);
return 1;
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 88c83c84325c..005fab2f3b73 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -583,13 +583,10 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long ret;
loff_t off = (loff_t)pgoff << PAGE_SHIFT;
- if (!IS_DAX(filp->f_mapping->host) || !IS_ENABLED(CONFIG_FS_DAX_PMD))
- goto out;
-
ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE);
if (ret)
return ret;
-out:
+
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
@@ -1381,39 +1378,6 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
if (flags & FOLL_TOUCH)
touch_pmd(vma, addr, pmd, flags);
- if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
- /*
- * We don't mlock() pte-mapped THPs. This way we can avoid
- * leaking mlocked pages into non-VM_LOCKED VMAs.
- *
- * For anon THP:
- *
- * In most cases the pmd is the only mapping of the page as we
- * break COW for the mlock() -- see gup_flags |= FOLL_WRITE for
- * writable private mappings in populate_vma_page_range().
- *
- * The only scenario when we have the page shared here is if we
- * mlocking read-only mapping shared over fork(). We skip
- * mlocking such pages.
- *
- * For file THP:
- *
- * We can expect PageDoubleMap() to be stable under page lock:
- * for file pages we set it in page_add_file_rmap(), which
- * requires page to be locked.
- */
-
- if (PageAnon(page) && compound_mapcount(page) != 1)
- goto skip_mlock;
- if (PageDoubleMap(page) || !page->mapping)
- goto skip_mlock;
- if (!trylock_page(page))
- goto skip_mlock;
- if (page->mapping && !PageDoubleMap(page))
- mlock_vma_page(page);
- unlock_page(page);
- }
-skip_mlock:
page += (addr & ~HPAGE_PMD_MASK) >> PAGE_SHIFT;
VM_BUG_ON_PAGE(!PageCompound(page) && !is_zone_device_page(page), page);
@@ -1611,7 +1575,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (pmd_present(orig_pmd)) {
page = pmd_page(orig_pmd);
- page_remove_rmap(page, true);
+ page_remove_rmap(page, vma, true);
VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
VM_BUG_ON_PAGE(!PageHead(page), page);
} else if (thp_migration_supported()) {
@@ -2007,7 +1971,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
set_page_dirty(page);
if (!PageReferenced(page) && pmd_young(old_pmd))
SetPageReferenced(page);
- page_remove_rmap(page, true);
+ page_remove_rmap(page, vma, true);
put_page(page);
}
add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR);
@@ -2141,6 +2105,9 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
}
}
unlock_page_memcg(page);
+
+ /* Above is effectively page_remove_rmap(page, vma, true) */
+ munlock_vma_page(page, vma, true);
}
smp_wmb(); /* make pte visible before pmd */
@@ -2148,18 +2115,18 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
if (freeze) {
for (i = 0; i < HPAGE_PMD_NR; i++) {
- page_remove_rmap(page + i, false);
+ page_remove_rmap(page + i, vma, false);
put_page(page + i);
}
}
}
void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long address, bool freeze, struct page *page)
+ unsigned long address, bool freeze, struct folio *folio)
{
spinlock_t *ptl;
struct mmu_notifier_range range;
- bool do_unlock_page = false;
+ bool do_unlock_folio = false;
pmd_t _pmd;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
@@ -2169,20 +2136,20 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
ptl = pmd_lock(vma->vm_mm, pmd);
/*
- * If caller asks to setup a migration entries, we need a page to check
- * pmd against. Otherwise we can end up replacing wrong page.
+ * If caller asks to setup a migration entry, we need a folio to check
+ * pmd against. Otherwise we can end up replacing wrong folio.
*/
- VM_BUG_ON(freeze && !page);
- if (page) {
- VM_WARN_ON_ONCE(!PageLocked(page));
- if (page != pmd_page(*pmd))
+ VM_BUG_ON(freeze && !folio);
+ if (folio) {
+ VM_WARN_ON_ONCE(!folio_test_locked(folio));
+ if (folio != page_folio(pmd_page(*pmd)))
goto out;
}
repeat:
if (pmd_trans_huge(*pmd)) {
- if (!page) {
- page = pmd_page(*pmd);
+ if (!folio) {
+ folio = page_folio(pmd_page(*pmd));
/*
* An anonymous page must be locked, to ensure that a
* concurrent reuse_swap_page() sees stable mapcount;
@@ -2190,33 +2157,31 @@ repeat:
* and page lock must not be taken when zap_pmd_range()
* calls __split_huge_pmd() while i_mmap_lock is held.
*/
- if (PageAnon(page)) {
- if (unlikely(!trylock_page(page))) {
- get_page(page);
+ if (folio_test_anon(folio)) {
+ if (unlikely(!folio_trylock(folio))) {
+ folio_get(folio);
_pmd = *pmd;
spin_unlock(ptl);
- lock_page(page);
+ folio_lock(folio);
spin_lock(ptl);
if (unlikely(!pmd_same(*pmd, _pmd))) {
- unlock_page(page);
- put_page(page);
- page = NULL;
+ folio_unlock(folio);
+ folio_put(folio);
+ folio = NULL;
goto repeat;
}
- put_page(page);
+ folio_put(folio);
}
- do_unlock_page = true;
+ do_unlock_folio = true;
}
}
- if (PageMlocked(page))
- clear_page_mlock(page);
} else if (!(pmd_devmap(*pmd) || is_pmd_migration_entry(*pmd)))
goto out;
__split_huge_pmd_locked(vma, pmd, range.start, freeze);
out:
spin_unlock(ptl);
- if (do_unlock_page)
- unlock_page(page);
+ if (do_unlock_folio)
+ folio_unlock(folio);
/*
* No need to double call mmu_notifier->invalidate_range() callback.
* They are 3 cases to consider inside __split_huge_pmd_locked():
@@ -2234,7 +2199,7 @@ out:
}
void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
- bool freeze, struct page *page)
+ bool freeze, struct folio *folio)
{
pgd_t *pgd;
p4d_t *p4d;
@@ -2255,7 +2220,7 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
pmd = pmd_offset(pud, address);
- __split_huge_pmd(vma, pmd, address, freeze, page);
+ __split_huge_pmd(vma, pmd, address, freeze, folio);
}
static inline void split_huge_pmd_if_needed(struct vm_area_struct *vma, unsigned long address)
@@ -2295,6 +2260,7 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
static void unmap_page(struct page *page)
{
+ struct folio *folio = page_folio(page);
enum ttu_flags ttu_flags = TTU_RMAP_LOCKED | TTU_SPLIT_HUGE_PMD |
TTU_SYNC;
@@ -2305,26 +2271,27 @@ static void unmap_page(struct page *page)
* pages can simply be left unmapped, then faulted back on demand.
* If that is ever changed (perhaps for mlock), update remap_page().
*/
- if (PageAnon(page))
- try_to_migrate(page, ttu_flags);
+ if (folio_test_anon(folio))
+ try_to_migrate(folio, ttu_flags);
else
- try_to_unmap(page, ttu_flags | TTU_IGNORE_MLOCK);
+ try_to_unmap(folio, ttu_flags | TTU_IGNORE_MLOCK);
VM_WARN_ON_ONCE_PAGE(page_mapped(page), page);
}
-static void remap_page(struct page *page, unsigned int nr)
+static void remap_page(struct folio *folio, unsigned long nr)
{
- int i;
+ int i = 0;
/* If unmap_page() uses try_to_migrate() on file, remove this check */
- if (!PageAnon(page))
+ if (!folio_test_anon(folio))
return;
- if (PageTransHuge(page)) {
- remove_migration_ptes(page, page, true);
- } else {
- for (i = 0; i < nr; i++)
- remove_migration_ptes(page + i, page + i, true);
+ for (;;) {
+ remove_migration_ptes(folio, folio, true);
+ i += folio_nr_pages(folio);
+ if (i >= nr)
+ break;
+ folio = folio_next(folio);
}
}
@@ -2344,8 +2311,11 @@ static void lru_add_page_tail(struct page *head, struct page *tail,
} else {
/* head is still on lru (and we have it frozen) */
VM_WARN_ON(!PageLRU(head));
+ if (PageUnevictable(tail))
+ tail->mlock_count = 0;
+ else
+ list_add_tail(&tail->lru, &head->lru);
SetPageLRU(tail);
- list_add_tail(&tail->lru, &head->lru);
}
}
@@ -2481,7 +2451,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
}
local_irq_enable();
- remap_page(head, nr);
+ remap_page(folio, nr);
if (PageSwapCache(head)) {
swp_entry_t entry = { .val = page_private(head) };
@@ -2506,30 +2476,6 @@ static void __split_huge_page(struct page *page, struct list_head *list,
}
}
-int total_mapcount(struct page *page)
-{
- int i, compound, nr, ret;
-
- VM_BUG_ON_PAGE(PageTail(page), page);
-
- if (likely(!PageCompound(page)))
- return atomic_read(&page->_mapcount) + 1;
-
- compound = compound_mapcount(page);
- nr = compound_nr(page);
- if (PageHuge(page))
- return compound;
- ret = compound;
- for (i = 0; i < nr; i++)
- ret += atomic_read(&page[i]._mapcount) + 1;
- /* File pages has compound_mapcount included in _mapcount */
- if (!PageAnon(page))
- return ret - compound * nr;
- if (PageDoubleMap(page))
- ret -= nr;
- return ret;
-}
-
/*
* This calculates accurately how many mappings a transparent hugepage
* has (unlike page_mapcount() which isn't fully accurate). This full
@@ -2579,18 +2525,19 @@ int page_trans_huge_mapcount(struct page *page)
}
/* Racy check whether the huge page can be split */
-bool can_split_huge_page(struct page *page, int *pextra_pins)
+bool can_split_folio(struct folio *folio, int *pextra_pins)
{
int extra_pins;
/* Additional pins from page cache */
- if (PageAnon(page))
- extra_pins = PageSwapCache(page) ? thp_nr_pages(page) : 0;
+ if (folio_test_anon(folio))
+ extra_pins = folio_test_swapcache(folio) ?
+ folio_nr_pages(folio) : 0;
else
- extra_pins = thp_nr_pages(page);
+ extra_pins = folio_nr_pages(folio);
if (pextra_pins)
*pextra_pins = extra_pins;
- return total_mapcount(page) == page_count(page) - extra_pins - 1;
+ return folio_mapcount(folio) == folio_ref_count(folio) - extra_pins - 1;
}
/*
@@ -2614,7 +2561,8 @@ bool can_split_huge_page(struct page *page, int *pextra_pins)
*/
int split_huge_page_to_list(struct page *page, struct list_head *list)
{
- struct page *head = compound_head(page);
+ struct folio *folio = page_folio(page);
+ struct page *head = &folio->page;
struct deferred_split *ds_queue = get_deferred_split_queue(head);
XA_STATE(xas, &head->mapping->i_pages, head->index);
struct anon_vma *anon_vma = NULL;
@@ -2634,7 +2582,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
* The caller does not necessarily hold an mmap_lock that would
* prevent the anon_vma disappearing so we first we take a
* reference to it and then lock the anon_vma for write. This
- * is similar to page_lock_anon_vma_read except the write lock
+ * is similar to folio_lock_anon_vma_read except the write lock
* is taken to serialise against parallel split or collapse
* operations.
*/
@@ -2681,7 +2629,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
* Racy check if we can split the page, before unmap_page() will
* split PMDs
*/
- if (!can_split_huge_page(head, &extra_pins)) {
+ if (!can_split_folio(folio, &extra_pins)) {
ret = -EBUSY;
goto out_unlock;
}
@@ -2731,7 +2679,7 @@ fail:
if (mapping)
xas_unlock(&xas);
local_irq_enable();
- remap_page(head, thp_nr_pages(head));
+ remap_page(folio, folio_nr_pages(folio));
ret = -EBUSY;
}
@@ -2988,7 +2936,7 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
goto next;
total++;
- if (!can_split_huge_page(compound_head(page), NULL))
+ if (!can_split_folio(page_folio(page), NULL))
goto next;
if (!trylock_page(page))
@@ -3181,7 +3129,7 @@ void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
if (pmd_soft_dirty(pmdval))
pmdswp = pmd_swp_mksoft_dirty(pmdswp);
set_pmd_at(mm, address, pvmw->pmd, pmdswp);
- page_remove_rmap(page, true);
+ page_remove_rmap(page, vma, true);
put_page(page);
}
@@ -3210,10 +3158,8 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
if (PageAnon(new))
page_add_anon_rmap(new, vma, mmun_start, true);
else
- page_add_file_rmap(new, true);
+ page_add_file_rmap(new, vma, true);
set_pmd_at(mm, mmun_start, pvmw->pmd, pmde);
- if ((vma->vm_flags & VM_LOCKED) && !PageDoubleMap(new))
- mlock_vma_page(new);
/* No need to invalidate - it was non-present before */
update_mmu_cache_pmd(vma, address, pvmw->pmd);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 75b41879e9e9..b34f50156f7e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1321,7 +1321,9 @@ static void __destroy_compound_gigantic_page(struct page *page,
}
set_compound_order(page, 0);
+#ifdef CONFIG_64BIT
page[1].compound_nr = 0;
+#endif
__ClearPageHead(page);
}
@@ -1813,7 +1815,9 @@ out_error:
for (; j < nr_pages; j++, p = mem_map_next(p, page, j))
__ClearPageReserved(p);
set_compound_order(page, 0);
+#ifdef CONFIG_64BIT
page[1].compound_nr = 0;
+#endif
__ClearPageHead(page);
return false;
}
@@ -5013,7 +5017,7 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct
set_page_dirty(page);
hugetlb_count_sub(pages_per_huge_page(h), mm);
- page_remove_rmap(page, true);
+ page_remove_rmap(page, vma, true);
spin_unlock(ptl);
tlb_remove_page_size(tlb, page, huge_page_size(h));
@@ -5258,7 +5262,7 @@ retry_avoidcopy:
/* Break COW */
huge_ptep_clear_flush(vma, haddr, ptep);
mmu_notifier_invalidate_range(mm, range.start, range.end);
- page_remove_rmap(old_page, true);
+ page_remove_rmap(old_page, vma, true);
hugepage_add_new_anon_rmap(new_page, vma, haddr);
set_huge_pte_at(mm, haddr, ptep,
make_huge_pte(vma, new_page, 1));
@@ -6074,7 +6078,7 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (pages) {
/*
- * try_grab_compound_head() should always succeed here,
+ * try_grab_folio() should always succeed here,
* because: a) we hold the ptl lock, and b) we've just
* checked that the huge page is present in the page
* tables. If the huge page is present, then the tail
@@ -6083,9 +6087,8 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
* any way. So this page must be available at this
* point, unless the page refcount overflowed:
*/
- if (WARN_ON_ONCE(!try_grab_compound_head(pages[i],
- refs,
- flags))) {
+ if (WARN_ON_ONCE(!try_grab_folio(pages[i], refs,
+ flags))) {
spin_unlock(ptl);
remainder = 0;
err = -ENOMEM;
diff --git a/mm/internal.h b/mm/internal.h
index 00d6e3e3ec45..58dc6adc19c5 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -10,6 +10,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
+#include <linux/rmap.h>
#include <linux/tracepoint-defs.h>
struct folio_batch;
@@ -66,24 +67,20 @@ static inline void wake_throttle_isolated(pg_data_t *pgdat)
vm_fault_t do_swap_page(struct vm_fault *vmf);
void folio_rotate_reclaimable(struct folio *folio);
bool __folio_end_writeback(struct folio *folio);
+void deactivate_file_folio(struct folio *folio);
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte);
-static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
-{
- return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
-}
-
struct zap_details;
void unmap_page_range(struct mmu_gather *tlb,
struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
struct zap_details *details);
-void do_page_cache_ra(struct readahead_control *, unsigned long nr_to_read,
- unsigned long lookahead_size);
+void page_cache_ra_order(struct readahead_control *, struct file_ra_state *,
+ unsigned int order);
void force_page_cache_ra(struct readahead_control *, unsigned long nr);
static inline void force_page_cache_readahead(struct address_space *mapping,
struct file *file, pgoff_t index, unsigned long nr_to_read)
@@ -100,6 +97,9 @@ void filemap_free_folio(struct address_space *mapping, struct folio *folio);
int truncate_inode_folio(struct address_space *mapping, struct folio *folio);
bool truncate_inode_partial_folio(struct folio *folio, loff_t start,
loff_t end);
+long invalidate_inode_page(struct page *page);
+unsigned long invalidate_mapping_pagevec(struct address_space *mapping,
+ pgoff_t start, pgoff_t end, unsigned long *nr_pagevec);
/**
* folio_evictable - Test whether a folio is evictable.
@@ -163,8 +163,10 @@ pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
/*
* in mm/vmscan.c:
*/
-extern int isolate_lru_page(struct page *page);
-extern void putback_lru_page(struct page *page);
+int isolate_lru_page(struct page *page);
+int folio_isolate_lru(struct folio *folio);
+void putback_lru_page(struct page *page);
+void folio_putback_lru(struct folio *folio);
extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason);
/*
@@ -396,6 +398,7 @@ static inline bool is_data_mapping(vm_flags_t flags)
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
struct vm_area_struct *prev);
void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
+struct anon_vma *folio_anon_vma(struct folio *folio);
#ifdef CONFIG_MMU
void unmap_mapping_folio(struct folio *folio);
@@ -404,32 +407,56 @@ extern long populate_vma_page_range(struct vm_area_struct *vma,
extern long faultin_vma_page_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
bool write, int *locked);
-extern void munlock_vma_pages_range(struct vm_area_struct *vma,
- unsigned long start, unsigned long end);
-static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
-{
- munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
-}
-
-/*
- * must be called with vma's mmap_lock held for read or write, and page locked.
- */
-extern void mlock_vma_page(struct page *page);
-extern unsigned int munlock_vma_page(struct page *page);
-
extern int mlock_future_check(struct mm_struct *mm, unsigned long flags,
unsigned long len);
-
/*
- * Clear the page's PageMlocked(). This can be useful in a situation where
- * we want to unconditionally remove a page from the pagecache -- e.g.,
- * on truncation or freeing.
+ * mlock_vma_page() and munlock_vma_page():
+ * should be called with vma's mmap_lock held for read or write,
+ * under page table lock for the pte/pmd being added or removed.
*
- * It is legal to call this function for any page, mlocked or not.
- * If called for a page that is still mapped by mlocked vmas, all we do
- * is revert to lazy LRU behaviour -- semantics are not broken.
+ * mlock is usually called at the end of page_add_*_rmap(),
+ * munlock at the end of page_remove_rmap(); but new anon
+ * pages are managed by lru_cache_add_inactive_or_unevictable()
+ * calling mlock_new_page().
+ *
+ * @compound is used to include pmd mappings of THPs, but filter out
+ * pte mappings of THPs, which cannot be consistently counted: a pte
+ * mapping of the THP head cannot be distinguished by the page alone.
*/
-extern void clear_page_mlock(struct page *page);
+void mlock_folio(struct folio *folio);
+static inline void mlock_vma_folio(struct folio *folio,
+ struct vm_area_struct *vma, bool compound)
+{
+ /*
+ * The VM_SPECIAL check here serves two purposes.
+ * 1) VM_IO check prevents migration from double-counting during mlock.
+ * 2) Although mmap_region() and mlock_fixup() take care that VM_LOCKED
+ * is never left set on a VM_SPECIAL vma, there is an interval while
+ * file->f_op->mmap() is using vm_insert_page(s), when VM_LOCKED may
+ * still be set while VM_SPECIAL bits are added: so ignore it then.
+ */
+ if (unlikely((vma->vm_flags & (VM_LOCKED|VM_SPECIAL)) == VM_LOCKED) &&
+ (compound || !folio_test_large(folio)))
+ mlock_folio(folio);
+}
+
+static inline void mlock_vma_page(struct page *page,
+ struct vm_area_struct *vma, bool compound)
+{
+ mlock_vma_folio(page_folio(page), vma, compound);
+}
+
+void munlock_page(struct page *page);
+static inline void munlock_vma_page(struct page *page,
+ struct vm_area_struct *vma, bool compound)
+{
+ if (unlikely(vma->vm_flags & VM_LOCKED) &&
+ (compound || !PageTransCompound(page)))
+ munlock_page(page);
+}
+void mlock_new_page(struct page *page);
+bool need_mlock_page_drain(int cpu);
+void mlock_page_drain(int cpu);
extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
@@ -463,18 +490,20 @@ vma_address(struct page *page, struct vm_area_struct *vma)
}
/*
- * Then at what user virtual address will none of the page be found in vma?
+ * Then at what user virtual address will none of the range be found in vma?
* Assumes that vma_address() already returned a good starting address.
- * If page is a compound head, the entire compound page is considered.
*/
-static inline unsigned long
-vma_address_end(struct page *page, struct vm_area_struct *vma)
+static inline unsigned long vma_address_end(struct page_vma_mapped_walk *pvmw)
{
+ struct vm_area_struct *vma = pvmw->vma;
pgoff_t pgoff;
unsigned long address;
- VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */
- pgoff = page_to_pgoff(page) + compound_nr(page);
+ /* Common case, plus ->pgoff is invalid for KSM */
+ if (pvmw->nr_pages == 1)
+ return pvmw->address + PAGE_SIZE;
+
+ pgoff = pvmw->pgoff + pvmw->nr_pages;
address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
/* Check for address beyond vma (or wrapped through 0?) */
if (address < vma->vm_start || address > vma->vm_end)
@@ -504,8 +533,13 @@ static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
}
#else /* !CONFIG_MMU */
static inline void unmap_mapping_folio(struct folio *folio) { }
-static inline void clear_page_mlock(struct page *page) { }
-static inline void mlock_vma_page(struct page *page) { }
+static inline void mlock_vma_page(struct page *page,
+ struct vm_area_struct *vma, bool compound) { }
+static inline void munlock_vma_page(struct page *page,
+ struct vm_area_struct *vma, bool compound) { }
+static inline void mlock_new_page(struct page *page) { }
+static inline bool need_mlock_page_drain(int cpu) { return false; }
+static inline void mlock_page_drain(int cpu) { }
static inline void vunmap_range_noflush(unsigned long start, unsigned long end)
{
}
@@ -713,6 +747,13 @@ void vunmap_range_noflush(unsigned long start, unsigned long end);
int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
unsigned long addr, int page_nid, int *flags);
+void free_zone_device_page(struct page *page);
+
+/*
+ * mm/gup.c
+ */
+struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags);
+
DECLARE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
#endif /* __MM_INTERNAL_H */
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 131492fd1148..1cdf7c38b9e5 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -774,7 +774,7 @@ static void __collapse_huge_page_copy(pte_t *pte, struct page *page,
*/
spin_lock(ptl);
ptep_clear(vma->vm_mm, address, _pte);
- page_remove_rmap(src_page, false);
+ page_remove_rmap(src_page, vma, false);
spin_unlock(ptl);
free_page_and_swap_cache(src_page);
}
@@ -1513,7 +1513,7 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr)
if (pte_none(*pte))
continue;
page = vm_normal_page(vma, addr, *pte);
- page_remove_rmap(page, false);
+ page_remove_rmap(page, vma, false);
}
pte_unmap_unlock(start_pte, ptl);
@@ -1834,13 +1834,13 @@ static void collapse_file(struct mm_struct *mm,
}
if (page_mapped(page))
- unmap_mapping_pages(mapping, index, 1, false);
+ try_to_unmap(page_folio(page),
+ TTU_IGNORE_MLOCK | TTU_BATCH_FLUSH);
xas_lock_irq(&xas);
xas_set(&xas, index);
VM_BUG_ON_PAGE(page != xas_load(&xas), page);
- VM_BUG_ON_PAGE(page_mapped(page), page);
/*
* The page is expected to have page_count() == 3:
@@ -1904,6 +1904,13 @@ xa_locked:
xas_unlock_irq(&xas);
xa_unlocked:
+ /*
+ * If collapse is successful, flush must be done now before copying.
+ * If collapse is unsuccessful, does flush actually need to be done?
+ * Do it anyway, to clear the state.
+ */
+ try_to_unmap_flush();
+
if (result == SCAN_SUCCEED) {
struct page *page, *tmp;
diff --git a/mm/ksm.c b/mm/ksm.c
index 03d599bbc155..063a48eeb5ee 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1034,10 +1034,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
pte_t *orig_pte)
{
struct mm_struct *mm = vma->vm_mm;
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- };
+ DEFINE_PAGE_VMA_WALK(pvmw, page, vma, 0, 0);
int swapped;
int err = -EFAULT;
struct mmu_notifier_range range;
@@ -1177,7 +1174,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
ptep_clear_flush(vma, addr, ptep);
set_pte_at_notify(mm, addr, ptep, newpte);
- page_remove_rmap(page, false);
+ page_remove_rmap(page, vma, false);
if (!page_mapped(page))
try_to_free_swap(page);
put_page(page);
@@ -1252,16 +1249,6 @@ static int try_to_merge_one_page(struct vm_area_struct *vma,
err = replace_page(vma, page, kpage, orig_pte);
}
- if ((vma->vm_flags & VM_LOCKED) && kpage && !err) {
- munlock_vma_page(page);
- if (!PageMlocked(kpage)) {
- unlock_page(page);
- lock_page(kpage);
- mlock_vma_page(kpage);
- page = kpage; /* for final unlock */
- }
- }
-
out_unlock:
unlock_page(page);
out:
@@ -2567,7 +2554,8 @@ void __ksm_exit(struct mm_struct *mm)
struct page *ksm_might_need_to_copy(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
- struct anon_vma *anon_vma = page_anon_vma(page);
+ struct folio *folio = page_folio(page);
+ struct anon_vma *anon_vma = folio_anon_vma(folio);
struct page *new_page;
if (PageKsm(page)) {
@@ -2603,21 +2591,21 @@ struct page *ksm_might_need_to_copy(struct page *page,
return new_page;
}
-void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
+void rmap_walk_ksm(struct folio *folio, const struct rmap_walk_control *rwc)
{
struct stable_node *stable_node;
struct rmap_item *rmap_item;
int search_new_forks = 0;
- VM_BUG_ON_PAGE(!PageKsm(page), page);
+ VM_BUG_ON_FOLIO(!folio_test_ksm(folio), folio);
/*
* Rely on the page lock to protect against concurrent modifications
* to that page's node of the stable tree.
*/
- VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
- stable_node = page_stable_node(page);
+ stable_node = folio_stable_node(folio);
if (!stable_node)
return;
again:
@@ -2652,11 +2640,11 @@ again:
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
continue;
- if (!rwc->rmap_one(page, vma, addr, rwc->arg)) {
+ if (!rwc->rmap_one(folio, vma, addr, rwc->arg)) {
anon_vma_unlock_read(anon_vma);
return;
}
- if (rwc->done && rwc->done(page)) {
+ if (rwc->done && rwc->done(folio)) {
anon_vma_unlock_read(anon_vma);
return;
}
diff --git a/mm/madvise.c b/mm/madvise.c
index 89490c859c3f..39b712fd8300 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -502,6 +502,11 @@ static void madvise_cold_page_range(struct mmu_gather *tlb,
tlb_end_vma(tlb, vma);
}
+static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
+{
+ return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
+}
+
static long madvise_cold(struct vm_area_struct *vma,
struct vm_area_struct **prev,
unsigned long start_addr, unsigned long end_addr)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f5ad1a680494..d495c2acb9f0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -53,6 +53,7 @@
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/vmpressure.h>
+#include <linux/memremap.h>
#include <linux/mm_inline.h>
#include <linux/swap_cgroup.h>
#include <linux/cpu.h>
@@ -1271,8 +1272,7 @@ struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
* @nr_pages: positive when adding or negative when removing
*
* This function must be called under lru_lock, just before a page is added
- * to or just after a page is removed from an lru list (that ordering being
- * so as to allow it to check that lru_size 0 is consistent with list_empty).
+ * to or just after a page is removed from an lru list.
*/
void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
int zid, int nr_pages)
@@ -5436,17 +5436,12 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
return NULL;
/*
- * Handle MEMORY_DEVICE_PRIVATE which are ZONE_DEVICE page belonging to
- * a device and because they are not accessible by CPU they are store
- * as special swap entry in the CPU page table.
+ * Handle device private pages that are not accessible by the CPU, but
+ * stored as special swap entries in the page table.
*/
if (is_device_private_entry(ent)) {
page = pfn_swap_entry_to_page(ent);
- /*
- * MEMORY_DEVICE_PRIVATE means ZONE_DEVICE page and which have
- * a refcount of 1 when free (unlike normal page)
- */
- if (!page_ref_add_unless(page, 1, 1))
+ if (!get_page_unless_zero(page))
return NULL;
return page;
}
@@ -7053,19 +7048,19 @@ static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
/**
* mem_cgroup_swapout - transfer a memsw charge to swap
- * @page: page whose memsw charge to transfer
+ * @folio: folio whose memsw charge to transfer
* @entry: swap entry to move the charge to
*
- * Transfer the memsw charge of @page to @entry.
+ * Transfer the memsw charge of @folio to @entry.
*/
-void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
+void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry)
{
struct mem_cgroup *memcg, *swap_memcg;
unsigned int nr_entries;
unsigned short oldid;
- VM_BUG_ON_PAGE(PageLRU(page), page);
- VM_BUG_ON_PAGE(page_count(page), page);
+ VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
+ VM_BUG_ON_FOLIO(folio_ref_count(folio), folio);
if (mem_cgroup_disabled())
return;
@@ -7073,9 +7068,9 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
return;
- memcg = page_memcg(page);
+ memcg = folio_memcg(folio);
- VM_WARN_ON_ONCE_PAGE(!memcg, page);
+ VM_WARN_ON_ONCE_FOLIO(!memcg, folio);
if (!memcg)
return;
@@ -7085,16 +7080,16 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
* ancestor for the swap instead and transfer the memory+swap charge.
*/
swap_memcg = mem_cgroup_id_get_online(memcg);
- nr_entries = thp_nr_pages(page);
+ nr_entries = folio_nr_pages(folio);
/* Get references for the tail pages, too */
if (nr_entries > 1)
mem_cgroup_id_get_many(swap_memcg, nr_entries - 1);
oldid = swap_cgroup_record(entry, mem_cgroup_id(swap_memcg),
nr_entries);
- VM_BUG_ON_PAGE(oldid, page);
+ VM_BUG_ON_FOLIO(oldid, folio);
mod_memcg_state(swap_memcg, MEMCG_SWAP, nr_entries);
- page->memcg_data = 0;
+ folio->memcg_data = 0;
if (!mem_cgroup_is_root(memcg))
page_counter_uncharge(&memcg->memory, nr_entries);
@@ -7114,7 +7109,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
memcg_stats_lock();
mem_cgroup_charge_statistics(memcg, -nr_entries);
memcg_stats_unlock();
- memcg_check_events(memcg, page_to_nid(page));
+ memcg_check_events(memcg, folio_nid(folio));
css_put(&memcg->css);
}
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 1434e0608d5a..dcb6bb9cf731 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -478,12 +478,13 @@ static struct task_struct *task_early_kill(struct task_struct *tsk,
static void collect_procs_anon(struct page *page, struct list_head *to_kill,
int force_early)
{
+ struct folio *folio = page_folio(page);
struct vm_area_struct *vma;
struct task_struct *tsk;
struct anon_vma *av;
pgoff_t pgoff;
- av = page_lock_anon_vma_read(page);
+ av = folio_lock_anon_vma_read(folio);
if (av == NULL) /* Not actually mapped anymore */
return;
@@ -1347,6 +1348,7 @@ static int get_hwpoison_page(struct page *p, unsigned long flags)
static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
int flags, struct page *hpage)
{
+ struct folio *folio = page_folio(hpage);
enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC;
struct address_space *mapping;
LIST_HEAD(tokill);
@@ -1421,12 +1423,12 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
*/
mapping = hugetlb_page_mapping_lock_write(hpage);
if (mapping) {
- try_to_unmap(hpage, ttu|TTU_RMAP_LOCKED);
+ try_to_unmap(folio, ttu|TTU_RMAP_LOCKED);
i_mmap_unlock_write(mapping);
} else
pr_info("Memory failure: %#lx: could not lock mapping for mapped huge page\n", pfn);
} else {
- try_to_unmap(hpage, ttu);
+ try_to_unmap(folio, ttu);
}
unmap_success = !page_mapped(hpage);
@@ -2169,7 +2171,7 @@ static bool isolate_page(struct page *page, struct list_head *pagelist)
*/
static int __soft_offline_page(struct page *page)
{
- int ret = 0;
+ long ret = 0;
unsigned long pfn = page_to_pfn(page);
struct page *hpage = compound_head(page);
char const *msg_page[] = {"page", "hugepage"};
@@ -2216,7 +2218,7 @@ static int __soft_offline_page(struct page *page)
if (!list_empty(&pagelist))
putback_movable_pages(&pagelist);
- pr_info("soft offline: %#lx: %s migration failed %d, type %pGp\n",
+ pr_info("soft offline: %#lx: %s migration failed %ld, type %pGp\n",
pfn, msg_page[huge], ret, &page->flags);
if (ret > 0)
ret = -EBUSY;
diff --git a/mm/memory.c b/mm/memory.c
index e0f3410fa70c..7c40850b7124 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -735,9 +735,6 @@ static void restore_exclusive_pte(struct vm_area_struct *vma,
set_pte_at(vma->vm_mm, address, ptep, pte);
- if (vma->vm_flags & VM_LOCKED)
- mlock_vma_page(page);
-
/*
* No need to invalidate - it was non-present before. However
* secondary CPUs may have mappings that need invalidating.
@@ -1389,7 +1386,7 @@ again:
mark_page_accessed(page);
}
rss[mm_counter(page)]--;
- page_remove_rmap(page, false);
+ page_remove_rmap(page, vma, false);
if (unlikely(page_mapcount(page) < 0))
print_bad_pte(vma, addr, ptent, page);
if (unlikely(__tlb_remove_page(tlb, page))) {
@@ -1408,7 +1405,7 @@ again:
continue;
rss[mm_counter(page)]--;
if (is_device_private_entry(entry))
- page_remove_rmap(page, false);
+ page_remove_rmap(page, vma, false);
put_page(page);
} else if (!non_swap_entry(entry)) {
/* Genuine swap entry, hence a private anon page */
@@ -1763,16 +1760,16 @@ static int validate_page_before_insert(struct page *page)
return 0;
}
-static int insert_page_into_pte_locked(struct mm_struct *mm, pte_t *pte,
+static int insert_page_into_pte_locked(struct vm_area_struct *vma, pte_t *pte,
unsigned long addr, struct page *page, pgprot_t prot)
{
if (!pte_none(*pte))
return -EBUSY;
/* Ok, finally just insert the thing.. */
get_page(page);
- inc_mm_counter_fast(mm, mm_counter_file(page));
- page_add_file_rmap(page, false);
- set_pte_at(mm, addr, pte, mk_pte(page, prot));
+ inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
+ page_add_file_rmap(page, vma, false);
+ set_pte_at(vma->vm_mm, addr, pte, mk_pte(page, prot));
return 0;
}
@@ -1786,7 +1783,6 @@ static int insert_page_into_pte_locked(struct mm_struct *mm, pte_t *pte,
static int insert_page(struct vm_area_struct *vma, unsigned long addr,
struct page *page, pgprot_t prot)
{
- struct mm_struct *mm = vma->vm_mm;
int retval;
pte_t *pte;
spinlock_t *ptl;
@@ -1795,17 +1791,17 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
if (retval)
goto out;
retval = -ENOMEM;
- pte = get_locked_pte(mm, addr, &ptl);
+ pte = get_locked_pte(vma->vm_mm, addr, &ptl);
if (!pte)
goto out;
- retval = insert_page_into_pte_locked(mm, pte, addr, page, prot);
+ retval = insert_page_into_pte_locked(vma, pte, addr, page, prot);
pte_unmap_unlock(pte, ptl);
out:
return retval;
}
#ifdef pte_index
-static int insert_page_in_batch_locked(struct mm_struct *mm, pte_t *pte,
+static int insert_page_in_batch_locked(struct vm_area_struct *vma, pte_t *pte,
unsigned long addr, struct page *page, pgprot_t prot)
{
int err;
@@ -1815,7 +1811,7 @@ static int insert_page_in_batch_locked(struct mm_struct *mm, pte_t *pte,
err = validate_page_before_insert(page);
if (err)
return err;
- return insert_page_into_pte_locked(mm, pte, addr, page, prot);
+ return insert_page_into_pte_locked(vma, pte, addr, page, prot);
}
/* insert_pages() amortizes the cost of spinlock operations
@@ -1852,7 +1848,7 @@ more:
start_pte = pte_offset_map_lock(mm, pmd, addr, &pte_lock);
for (pte = start_pte; pte_idx < batch_size; ++pte, ++pte_idx) {
- int err = insert_page_in_batch_locked(mm, pte,
+ int err = insert_page_in_batch_locked(vma, pte,
addr, pages[curr_page_idx], prot);
if (unlikely(err)) {
pte_unmap_unlock(start_pte, pte_lock);
@@ -3108,7 +3104,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
* mapcount is visible. So transitively, TLBs to
* old page will be flushed before it can be reused.
*/
- page_remove_rmap(old_page, false);
+ page_remove_rmap(old_page, vma, false);
}
/* Free the old page.. */
@@ -3128,16 +3124,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
*/
mmu_notifier_invalidate_range_only_end(&range);
if (old_page) {
- /*
- * Don't let another task, with possibly unlocked vma,
- * keep the mlocked page.
- */
- if (page_copied && (vma->vm_flags & VM_LOCKED)) {
- lock_page(old_page); /* LRU manipulation */
- if (PageMlocked(old_page))
- munlock_vma_page(old_page);
- unlock_page(old_page);
- }
if (page_copied)
free_swap_cache(old_page);
put_page(old_page);
@@ -3958,7 +3944,8 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
add_mm_counter(vma->vm_mm, mm_counter_file(page), HPAGE_PMD_NR);
- page_add_file_rmap(page, true);
+ page_add_file_rmap(page, vma, true);
+
/*
* deposit and withdraw with pmd lock held
*/
@@ -4007,7 +3994,7 @@ void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr)
lru_cache_add_inactive_or_unevictable(page, vma);
} else {
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
- page_add_file_rmap(page, false);
+ page_add_file_rmap(page, vma, false);
}
set_pte_at(vma->vm_mm, addr, vmf->pte, entry);
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index aee69281dad6..416b38ca8def 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1617,10 +1617,13 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
DEFAULT_RATELIMIT_BURST);
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
+ struct folio *folio;
+
if (!pfn_valid(pfn))
continue;
page = pfn_to_page(pfn);
- head = compound_head(page);
+ folio = page_folio(page);
+ head = &folio->page;
if (PageHuge(page)) {
pfn = page_to_pfn(head) + compound_nr(head) - 1;
@@ -1637,10 +1640,10 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
* the unmap as the catch all safety net).
*/
if (PageHWPoison(page)) {
- if (WARN_ON(PageLRU(page)))
- isolate_lru_page(page);
- if (page_mapped(page))
- try_to_unmap(page, TTU_IGNORE_MLOCK);
+ if (WARN_ON(folio_test_lru(folio)))
+ folio_isolate_lru(folio);
+ if (folio_mapped(folio))
+ try_to_unmap(folio, TTU_IGNORE_MLOCK);
continue;
}
diff --git a/mm/memremap.c b/mm/memremap.c
index 4d73533d8ca7..c17eca4a48ca 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -4,7 +4,7 @@
#include <linux/io.h>
#include <linux/kasan.h>
#include <linux/memory_hotplug.h>
-#include <linux/mm.h>
+#include <linux/memremap.h>
#include <linux/pfn_t.h>
#include <linux/swap.h>
#include <linux/mmzone.h>
@@ -12,6 +12,7 @@
#include <linux/types.h>
#include <linux/wait_bit.h>
#include <linux/xarray.h>
+#include "internal.h"
static DEFINE_XARRAY(pgmap_array);
@@ -37,21 +38,19 @@ unsigned long memremap_compat_align(void)
EXPORT_SYMBOL_GPL(memremap_compat_align);
#endif
-#ifdef CONFIG_DEV_PAGEMAP_OPS
+#ifdef CONFIG_FS_DAX
DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
EXPORT_SYMBOL(devmap_managed_key);
static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
{
- if (pgmap->type == MEMORY_DEVICE_PRIVATE ||
- pgmap->type == MEMORY_DEVICE_FS_DAX)
+ if (pgmap->type == MEMORY_DEVICE_FS_DAX)
static_branch_dec(&devmap_managed_key);
}
static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
{
- if (pgmap->type == MEMORY_DEVICE_PRIVATE ||
- pgmap->type == MEMORY_DEVICE_FS_DAX)
+ if (pgmap->type == MEMORY_DEVICE_FS_DAX)
static_branch_inc(&devmap_managed_key);
}
#else
@@ -61,7 +60,7 @@ static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
{
}
-#endif /* CONFIG_DEV_PAGEMAP_OPS */
+#endif /* CONFIG_FS_DAX */
static void pgmap_array_delete(struct range *range)
{
@@ -102,23 +101,12 @@ static unsigned long pfn_end(struct dev_pagemap *pgmap, int range_id)
return (range->start + range_len(range)) >> PAGE_SHIFT;
}
-static unsigned long pfn_next(struct dev_pagemap *pgmap, unsigned long pfn)
-{
- if (pfn % (1024 << pgmap->vmemmap_shift))
- cond_resched();
- return pfn + pgmap_vmemmap_nr(pgmap);
-}
-
static unsigned long pfn_len(struct dev_pagemap *pgmap, unsigned long range_id)
{
return (pfn_end(pgmap, range_id) -
pfn_first(pgmap, range_id)) >> pgmap->vmemmap_shift;
}
-#define for_each_device_pfn(pfn, map, i) \
- for (pfn = pfn_first(map, i); pfn < pfn_end(map, i); \
- pfn = pfn_next(map, pfn))
-
static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
{
struct range *range = &pgmap->ranges[range_id];
@@ -147,13 +135,11 @@ static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
void memunmap_pages(struct dev_pagemap *pgmap)
{
- unsigned long pfn;
int i;
percpu_ref_kill(&pgmap->ref);
for (i = 0; i < pgmap->nr_range; i++)
- for_each_device_pfn(pfn, pgmap, i)
- put_page(pfn_to_page(pfn));
+ percpu_ref_put_many(&pgmap->ref, pfn_len(pgmap, i));
wait_for_completion(&pgmap->done);
percpu_ref_exit(&pgmap->ref);
@@ -329,8 +315,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
}
break;
case MEMORY_DEVICE_FS_DAX:
- if (!IS_ENABLED(CONFIG_ZONE_DEVICE) ||
- IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
+ if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
WARN(1, "File system DAX not supported\n");
return ERR_PTR(-EINVAL);
}
@@ -466,21 +451,17 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
}
EXPORT_SYMBOL_GPL(get_dev_pagemap);
-#ifdef CONFIG_DEV_PAGEMAP_OPS
-void free_devmap_managed_page(struct page *page)
+void free_zone_device_page(struct page *page)
{
- /* notify page idle for dax */
- if (!is_device_private_page(page)) {
- wake_up_var(&page->_refcount);
+ if (WARN_ON_ONCE(!page->pgmap->ops || !page->pgmap->ops->page_free))
return;
- }
__ClearPageWaiters(page);
mem_cgroup_uncharge(page_folio(page));
/*
- * When a device_private page is freed, the page->mapping field
+ * When a device managed page is freed, the page->mapping field
* may still contain a (stale) mapping value. For example, the
* lower bits of page->mapping may still identify the page as an
* anonymous page. Ultimately, this entire field is just stale
@@ -502,5 +483,27 @@ void free_devmap_managed_page(struct page *page)
*/
page->mapping = NULL;
page->pgmap->ops->page_free(page);
+
+ /*
+ * Reset the page count to 1 to prepare for handing out the page again.
+ */
+ set_page_count(page, 1);
+}
+
+#ifdef CONFIG_FS_DAX
+bool __put_devmap_managed_page(struct page *page)
+{
+ if (page->pgmap->type != MEMORY_DEVICE_FS_DAX)
+ return false;
+
+ /*
+ * fsdax page refcounts are 1-based, rather than 0-based: if
+ * refcount is 1, then the page is free and the refcount is
+ * stable because nobody holds a reference on the page.
+ */
+ if (page_ref_dec_return(page) == 1)
+ wake_up_var(&page->_refcount);
+ return true;
}
-#endif /* CONFIG_DEV_PAGEMAP_OPS */
+EXPORT_SYMBOL(__put_devmap_managed_page);
+#endif /* CONFIG_FS_DAX */
diff --git a/mm/migrate.c b/mm/migrate.c
index bc9da3fd01aa..4f30ed37856f 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -38,12 +38,10 @@
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/gfp.h>
-#include <linux/pagewalk.h>
#include <linux/pfn_t.h>
#include <linux/memremap.h>
#include <linux/userfaultfd_k.h>
#include <linux/balloon_compaction.h>
-#include <linux/mmu_notifier.h>
#include <linux/page_idle.h>
#include <linux/page_owner.h>
#include <linux/sched/mm.h>
@@ -174,37 +172,33 @@ void putback_movable_pages(struct list_head *l)
/*
* Restore a potential migration pte to a working pte entry
*/
-static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
- unsigned long addr, void *old)
+static bool remove_migration_pte(struct folio *folio,
+ struct vm_area_struct *vma, unsigned long addr, void *old)
{
- struct page_vma_mapped_walk pvmw = {
- .page = old,
- .vma = vma,
- .address = addr,
- .flags = PVMW_SYNC | PVMW_MIGRATION,
- };
- struct page *new;
- pte_t pte;
- swp_entry_t entry;
+ DEFINE_FOLIO_VMA_WALK(pvmw, old, vma, addr, PVMW_SYNC | PVMW_MIGRATION);
- VM_BUG_ON_PAGE(PageTail(page), page);
while (page_vma_mapped_walk(&pvmw)) {
- if (PageKsm(page))
- new = page;
- else
- new = page - pvmw.page->index +
- linear_page_index(vma, pvmw.address);
+ pte_t pte;
+ swp_entry_t entry;
+ struct page *new;
+ unsigned long idx = 0;
+
+ /* pgoff is invalid for ksm pages, but they are never large */
+ if (folio_test_large(folio) && !folio_test_hugetlb(folio))
+ idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;
+ new = folio_page(folio, idx);
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
/* PMD-mapped THP migration entry */
if (!pvmw.pte) {
- VM_BUG_ON_PAGE(PageHuge(page) || !PageTransCompound(page), page);
+ VM_BUG_ON_FOLIO(folio_test_hugetlb(folio) ||
+ !folio_test_pmd_mappable(folio), folio);
remove_migration_pmd(&pvmw, new);
continue;
}
#endif
- get_page(new);
+ folio_get(folio);
pte = pte_mkold(mk_pte(new, READ_ONCE(vma->vm_page_prot)));
if (pte_swp_soft_dirty(*pvmw.pte))
pte = pte_mksoft_dirty(pte);
@@ -233,12 +227,12 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
}
#ifdef CONFIG_HUGETLB_PAGE
- if (PageHuge(new)) {
+ if (folio_test_hugetlb(folio)) {
unsigned int shift = huge_page_shift(hstate_vma(vma));
pte = pte_mkhuge(pte);
pte = arch_make_huge_pte(pte, shift, vma->vm_flags);
- if (PageAnon(new))
+ if (folio_test_anon(folio))
hugepage_add_anon_rmap(new, vma, pvmw.address);
else
page_dup_rmap(new, true);
@@ -246,17 +240,14 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
} else
#endif
{
- if (PageAnon(new))
+ if (folio_test_anon(folio))
page_add_anon_rmap(new, vma, pvmw.address, false);
else
- page_add_file_rmap(new, false);
+ page_add_file_rmap(new, vma, false);
set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte);
}
- if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new))
- mlock_vma_page(new);
-
- if (PageTransHuge(page) && PageMlocked(page))
- clear_page_mlock(page);
+ if (vma->vm_flags & VM_LOCKED)
+ mlock_page_drain(smp_processor_id());
/* No need to invalidate - it was non-present before */
update_mmu_cache(vma, pvmw.address, pvmw.pte);
@@ -269,17 +260,17 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
* Get rid of all migration entries and replace them by
* references to the indicated page.
*/
-void remove_migration_ptes(struct page *old, struct page *new, bool locked)
+void remove_migration_ptes(struct folio *src, struct folio *dst, bool locked)
{
struct rmap_walk_control rwc = {
.rmap_one = remove_migration_pte,
- .arg = old,
+ .arg = src,
};
if (locked)
- rmap_walk_locked(new, &rwc);
+ rmap_walk_locked(dst, &rwc);
else
- rmap_walk(new, &rwc);
+ rmap_walk(dst, &rwc);
}
/*
@@ -342,14 +333,8 @@ static int expected_page_refs(struct address_space *mapping, struct page *page)
{
int expected_count = 1;
- /*
- * Device private pages have an extra refcount as they are
- * ZONE_DEVICE pages.
- */
- expected_count += is_device_private_page(page);
if (mapping)
expected_count += compound_nr(page) + page_has_private(page);
-
return expected_count;
}
@@ -772,6 +757,7 @@ int buffer_migrate_page_norefs(struct address_space *mapping,
*/
static int writeout(struct address_space *mapping, struct page *page)
{
+ struct folio *folio = page_folio(page);
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
.nr_to_write = 1,
@@ -797,7 +783,7 @@ static int writeout(struct address_space *mapping, struct page *page)
* At this point we know that the migration attempt cannot
* be successful.
*/
- remove_migration_ptes(page, page, false);
+ remove_migration_ptes(folio, folio, false);
rc = mapping->a_ops->writepage(page, &wbc);
@@ -927,6 +913,8 @@ out:
static int __unmap_and_move(struct page *page, struct page *newpage,
int force, enum migrate_mode mode)
{
+ struct folio *folio = page_folio(page);
+ struct folio *dst = page_folio(newpage);
int rc = -EAGAIN;
bool page_was_mapped = false;
struct anon_vma *anon_vma = NULL;
@@ -1030,16 +1018,31 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
/* Establish migration ptes */
VM_BUG_ON_PAGE(PageAnon(page) && !PageKsm(page) && !anon_vma,
page);
- try_to_migrate(page, 0);
+ try_to_migrate(folio, 0);
page_was_mapped = true;
}
if (!page_mapped(page))
rc = move_to_new_page(newpage, page, mode);
+ /*
+ * When successful, push newpage to LRU immediately: so that if it
+ * turns out to be an mlocked page, remove_migration_ptes() will
+ * automatically build up the correct newpage->mlock_count for it.
+ *
+ * We would like to do something similar for the old page, when
+ * unsuccessful, and other cases when a page has been temporarily
+ * isolated from the unevictable LRU: but this case is the easiest.
+ */
+ if (rc == MIGRATEPAGE_SUCCESS) {
+ lru_cache_add(newpage);
+ if (page_was_mapped)
+ lru_add_drain();
+ }
+
if (page_was_mapped)
- remove_migration_ptes(page,
- rc == MIGRATEPAGE_SUCCESS ? newpage : page, false);
+ remove_migration_ptes(folio,
+ rc == MIGRATEPAGE_SUCCESS ? dst : folio, false);
out_unlock_both:
unlock_page(newpage);
@@ -1050,20 +1053,12 @@ out_unlock:
unlock_page(page);
out:
/*
- * If migration is successful, decrease refcount of the newpage
+ * If migration is successful, decrease refcount of the newpage,
* which will not free the page because new page owner increased
- * refcounter. As well, if it is LRU page, add the page to LRU
- * list in here. Use the old state of the isolated source page to
- * determine if we migrated a LRU page. newpage was already unlocked
- * and possibly modified by its owner - don't rely on the page
- * state.
+ * refcounter.
*/
- if (rc == MIGRATEPAGE_SUCCESS) {
- if (unlikely(!is_lru))
- put_page(newpage);
- else
- putback_lru_page(newpage);
- }
+ if (rc == MIGRATEPAGE_SUCCESS)
+ put_page(newpage);
return rc;
}
@@ -1173,6 +1168,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
enum migrate_mode mode, int reason,
struct list_head *ret)
{
+ struct folio *dst, *src = page_folio(hpage);
int rc = -EAGAIN;
int page_was_mapped = 0;
struct page *new_hpage;
@@ -1200,6 +1196,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
new_hpage = get_new_page(hpage, private);
if (!new_hpage)
return -ENOMEM;
+ dst = page_folio(new_hpage);
if (!trylock_page(hpage)) {
if (!force)
@@ -1249,7 +1246,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
ttu |= TTU_RMAP_LOCKED;
}
- try_to_migrate(hpage, ttu);
+ try_to_migrate(src, ttu);
page_was_mapped = 1;
if (mapping_locked)
@@ -1260,8 +1257,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
rc = move_to_new_page(new_hpage, hpage, mode);
if (page_was_mapped)
- remove_migration_ptes(hpage,
- rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage, false);
+ remove_migration_ptes(src,
+ rc == MIGRATEPAGE_SUCCESS ? dst : src, false);
unlock_put_anon:
unlock_page(new_hpage);
@@ -2147,761 +2144,6 @@ out:
#endif /* CONFIG_NUMA_BALANCING */
#endif /* CONFIG_NUMA */
-#ifdef CONFIG_DEVICE_PRIVATE
-static int migrate_vma_collect_skip(unsigned long start,
- unsigned long end,
- struct mm_walk *walk)
-{
- struct migrate_vma *migrate = walk->private;
- unsigned long addr;
-
- for (addr = start; addr < end; addr += PAGE_SIZE) {
- migrate->dst[migrate->npages] = 0;
- migrate->src[migrate->npages++] = 0;
- }
-
- return 0;
-}
-
-static int migrate_vma_collect_hole(unsigned long start,
- unsigned long end,
- __always_unused int depth,
- struct mm_walk *walk)
-{
- struct migrate_vma *migrate = walk->private;
- unsigned long addr;
-
- /* Only allow populating anonymous memory. */
- if (!vma_is_anonymous(walk->vma))
- return migrate_vma_collect_skip(start, end, walk);
-
- for (addr = start; addr < end; addr += PAGE_SIZE) {
- migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE;
- migrate->dst[migrate->npages] = 0;
- migrate->npages++;
- migrate->cpages++;
- }
-
- return 0;
-}
-
-static int migrate_vma_collect_pmd(pmd_t *pmdp,
- unsigned long start,
- unsigned long end,
- struct mm_walk *walk)
-{
- struct migrate_vma *migrate = walk->private;
- struct vm_area_struct *vma = walk->vma;
- struct mm_struct *mm = vma->vm_mm;
- unsigned long addr = start, unmapped = 0;
- spinlock_t *ptl;
- pte_t *ptep;
-
-again:
- if (pmd_none(*pmdp))
- return migrate_vma_collect_hole(start, end, -1, walk);
-
- if (pmd_trans_huge(*pmdp)) {
- struct page *page;
-
- ptl = pmd_lock(mm, pmdp);
- if (unlikely(!pmd_trans_huge(*pmdp))) {
- spin_unlock(ptl);
- goto again;
- }
-
- page = pmd_page(*pmdp);
- if (is_huge_zero_page(page)) {
- spin_unlock(ptl);
- split_huge_pmd(vma, pmdp, addr);
- if (pmd_trans_unstable(pmdp))
- return migrate_vma_collect_skip(start, end,
- walk);
- } else {
- int ret;
-
- get_page(page);
- spin_unlock(ptl);
- if (unlikely(!trylock_page(page)))
- return migrate_vma_collect_skip(start, end,
- walk);
- ret = split_huge_page(page);
- unlock_page(page);
- put_page(page);
- if (ret)
- return migrate_vma_collect_skip(start, end,
- walk);
- if (pmd_none(*pmdp))
- return migrate_vma_collect_hole(start, end, -1,
- walk);
- }
- }
-
- if (unlikely(pmd_bad(*pmdp)))
- return migrate_vma_collect_skip(start, end, walk);
-
- ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
- arch_enter_lazy_mmu_mode();
-
- for (; addr < end; addr += PAGE_SIZE, ptep++) {
- unsigned long mpfn = 0, pfn;
- struct page *page;
- swp_entry_t entry;
- pte_t pte;
-
- pte = *ptep;
-
- if (pte_none(pte)) {
- if (vma_is_anonymous(vma)) {
- mpfn = MIGRATE_PFN_MIGRATE;
- migrate->cpages++;
- }
- goto next;
- }
-
- if (!pte_present(pte)) {
- /*
- * Only care about unaddressable device page special
- * page table entry. Other special swap entries are not
- * migratable, and we ignore regular swapped page.
- */
- entry = pte_to_swp_entry(pte);
- if (!is_device_private_entry(entry))
- goto next;
-
- page = pfn_swap_entry_to_page(entry);
- if (!(migrate->flags &
- MIGRATE_VMA_SELECT_DEVICE_PRIVATE) ||
- page->pgmap->owner != migrate->pgmap_owner)
- goto next;
-
- mpfn = migrate_pfn(page_to_pfn(page)) |
- MIGRATE_PFN_MIGRATE;
- if (is_writable_device_private_entry(entry))
- mpfn |= MIGRATE_PFN_WRITE;
- } else {
- if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM))
- goto next;
- pfn = pte_pfn(pte);
- if (is_zero_pfn(pfn)) {
- mpfn = MIGRATE_PFN_MIGRATE;
- migrate->cpages++;
- goto next;
- }
- page = vm_normal_page(migrate->vma, addr, pte);
- mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE;
- mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
- }
-
- /* FIXME support THP */
- if (!page || !page->mapping || PageTransCompound(page)) {
- mpfn = 0;
- goto next;
- }
-
- /*
- * By getting a reference on the page we pin it and that blocks
- * any kind of migration. Side effect is that it "freezes" the
- * pte.
- *
- * We drop this reference after isolating the page from the lru
- * for non device page (device page are not on the lru and thus
- * can't be dropped from it).
- */
- get_page(page);
-
- /*
- * Optimize for the common case where page is only mapped once
- * in one process. If we can lock the page, then we can safely
- * set up a special migration page table entry now.
- */
- if (trylock_page(page)) {
- pte_t swp_pte;
-
- migrate->cpages++;
- ptep_get_and_clear(mm, addr, ptep);
-
- /* Setup special migration page table entry */
- if (mpfn & MIGRATE_PFN_WRITE)
- entry = make_writable_migration_entry(
- page_to_pfn(page));
- else
- entry = make_readable_migration_entry(
- page_to_pfn(page));
- swp_pte = swp_entry_to_pte(entry);
- if (pte_present(pte)) {
- if (pte_soft_dirty(pte))
- swp_pte = pte_swp_mksoft_dirty(swp_pte);
- if (pte_uffd_wp(pte))
- swp_pte = pte_swp_mkuffd_wp(swp_pte);
- } else {
- if (pte_swp_soft_dirty(pte))
- swp_pte = pte_swp_mksoft_dirty(swp_pte);
- if (pte_swp_uffd_wp(pte))
- swp_pte = pte_swp_mkuffd_wp(swp_pte);
- }
- set_pte_at(mm, addr, ptep, swp_pte);
-
- /*
- * This is like regular unmap: we remove the rmap and
- * drop page refcount. Page won't be freed, as we took
- * a reference just above.
- */
- page_remove_rmap(page, false);
- put_page(page);
-
- if (pte_present(pte))
- unmapped++;
- } else {
- put_page(page);
- mpfn = 0;
- }
-
-next:
- migrate->dst[migrate->npages] = 0;
- migrate->src[migrate->npages++] = mpfn;
- }
- arch_leave_lazy_mmu_mode();
- pte_unmap_unlock(ptep - 1, ptl);
-
- /* Only flush the TLB if we actually modified any entries */
- if (unmapped)
- flush_tlb_range(walk->vma, start, end);
-
- return 0;
-}
-
-static const struct mm_walk_ops migrate_vma_walk_ops = {
- .pmd_entry = migrate_vma_collect_pmd,
- .pte_hole = migrate_vma_collect_hole,
-};
-
-/*
- * migrate_vma_collect() - collect pages over a range of virtual addresses
- * @migrate: migrate struct containing all migration information
- *
- * This will walk the CPU page table. For each virtual address backed by a
- * valid page, it updates the src array and takes a reference on the page, in
- * order to pin the page until we lock it and unmap it.
- */
-static void migrate_vma_collect(struct migrate_vma *migrate)
-{
- struct mmu_notifier_range range;
-
- /*
- * Note that the pgmap_owner is passed to the mmu notifier callback so
- * that the registered device driver can skip invalidating device
- * private page mappings that won't be migrated.
- */
- mmu_notifier_range_init_owner(&range, MMU_NOTIFY_MIGRATE, 0,
- migrate->vma, migrate->vma->vm_mm, migrate->start, migrate->end,
- migrate->pgmap_owner);
- mmu_notifier_invalidate_range_start(&range);
-
- walk_page_range(migrate->vma->vm_mm, migrate->start, migrate->end,
- &migrate_vma_walk_ops, migrate);
-
- mmu_notifier_invalidate_range_end(&range);
- migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
-}
-
-/*
- * migrate_vma_check_page() - check if page is pinned or not
- * @page: struct page to check
- *
- * Pinned pages cannot be migrated. This is the same test as in
- * folio_migrate_mapping(), except that here we allow migration of a
- * ZONE_DEVICE page.
- */
-static bool migrate_vma_check_page(struct page *page)
-{
- /*
- * One extra ref because caller holds an extra reference, either from
- * isolate_lru_page() for a regular page, or migrate_vma_collect() for
- * a device page.
- */
- int extra = 1;
-
- /*
- * FIXME support THP (transparent huge page), it is bit more complex to
- * check them than regular pages, because they can be mapped with a pmd
- * or with a pte (split pte mapping).
- */
- if (PageCompound(page))
- return false;
-
- /* Page from ZONE_DEVICE have one extra reference */
- if (is_zone_device_page(page))
- extra++;
-
- /* For file back page */
- if (page_mapping(page))
- extra += 1 + page_has_private(page);
-
- if ((page_count(page) - extra) > page_mapcount(page))
- return false;
-
- return true;
-}
-
-/*
- * migrate_vma_unmap() - replace page mapping with special migration pte entry
- * @migrate: migrate struct containing all migration information
- *
- * Isolate pages from the LRU and replace mappings (CPU page table pte) with a
- * special migration pte entry and check if it has been pinned. Pinned pages are
- * restored because we cannot migrate them.
- *
- * This is the last step before we call the device driver callback to allocate
- * destination memory and copy contents of original page over to new page.
- */
-static void migrate_vma_unmap(struct migrate_vma *migrate)
-{
- const unsigned long npages = migrate->npages;
- unsigned long i, restore = 0;
- bool allow_drain = true;
-
- lru_add_drain();
-
- for (i = 0; i < npages; i++) {
- struct page *page = migrate_pfn_to_page(migrate->src[i]);
-
- if (!page)
- continue;
-
- /* ZONE_DEVICE pages are not on LRU */
- if (!is_zone_device_page(page)) {
- if (!PageLRU(page) && allow_drain) {
- /* Drain CPU's pagevec */
- lru_add_drain_all();
- allow_drain = false;
- }
-
- if (isolate_lru_page(page)) {
- migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
- migrate->cpages--;
- restore++;
- continue;
- }
-
- /* Drop the reference we took in collect */
- put_page(page);
- }
-
- if (page_mapped(page))
- try_to_migrate(page, 0);
-
- if (page_mapped(page) || !migrate_vma_check_page(page)) {
- if (!is_zone_device_page(page)) {
- get_page(page);
- putback_lru_page(page);
- }
-
- migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
- migrate->cpages--;
- restore++;
- continue;
- }
- }
-
- for (i = 0; i < npages && restore; i++) {
- struct page *page = migrate_pfn_to_page(migrate->src[i]);
-
- if (!page || (migrate->src[i] & MIGRATE_PFN_MIGRATE))
- continue;
-
- remove_migration_ptes(page, page, false);
-
- migrate->src[i] = 0;
- unlock_page(page);
- put_page(page);
- restore--;
- }
-}
-
-/**
- * migrate_vma_setup() - prepare to migrate a range of memory
- * @args: contains the vma, start, and pfns arrays for the migration
- *
- * Returns: negative errno on failures, 0 when 0 or more pages were migrated
- * without an error.
- *
- * Prepare to migrate a range of memory virtual address range by collecting all
- * the pages backing each virtual address in the range, saving them inside the
- * src array. Then lock those pages and unmap them. Once the pages are locked
- * and unmapped, check whether each page is pinned or not. Pages that aren't
- * pinned have the MIGRATE_PFN_MIGRATE flag set (by this function) in the
- * corresponding src array entry. Then restores any pages that are pinned, by
- * remapping and unlocking those pages.
- *
- * The caller should then allocate destination memory and copy source memory to
- * it for all those entries (ie with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE
- * flag set). Once these are allocated and copied, the caller must update each
- * corresponding entry in the dst array with the pfn value of the destination
- * page and with MIGRATE_PFN_VALID. Destination pages must be locked via
- * lock_page().
- *
- * Note that the caller does not have to migrate all the pages that are marked
- * with MIGRATE_PFN_MIGRATE flag in src array unless this is a migration from
- * device memory to system memory. If the caller cannot migrate a device page
- * back to system memory, then it must return VM_FAULT_SIGBUS, which has severe
- * consequences for the userspace process, so it must be avoided if at all
- * possible.
- *
- * For empty entries inside CPU page table (pte_none() or pmd_none() is true) we
- * do set MIGRATE_PFN_MIGRATE flag inside the corresponding source array thus
- * allowing the caller to allocate device memory for those unbacked virtual
- * addresses. For this the caller simply has to allocate device memory and
- * properly set the destination entry like for regular migration. Note that
- * this can still fail, and thus inside the device driver you must check if the
- * migration was successful for those entries after calling migrate_vma_pages(),
- * just like for regular migration.
- *
- * After that, the callers must call migrate_vma_pages() to go over each entry
- * in the src array that has the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag
- * set. If the corresponding entry in dst array has MIGRATE_PFN_VALID flag set,
- * then migrate_vma_pages() to migrate struct page information from the source
- * struct page to the destination struct page. If it fails to migrate the
- * struct page information, then it clears the MIGRATE_PFN_MIGRATE flag in the
- * src array.
- *
- * At this point all successfully migrated pages have an entry in the src
- * array with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set and the dst
- * array entry with MIGRATE_PFN_VALID flag set.
- *
- * Once migrate_vma_pages() returns the caller may inspect which pages were
- * successfully migrated, and which were not. Successfully migrated pages will
- * have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
- *
- * It is safe to update device page table after migrate_vma_pages() because
- * both destination and source page are still locked, and the mmap_lock is held
- * in read mode (hence no one can unmap the range being migrated).
- *
- * Once the caller is done cleaning up things and updating its page table (if it
- * chose to do so, this is not an obligation) it finally calls
- * migrate_vma_finalize() to update the CPU page table to point to new pages
- * for successfully migrated pages or otherwise restore the CPU page table to
- * point to the original source pages.
- */
-int migrate_vma_setup(struct migrate_vma *args)
-{
- long nr_pages = (args->end - args->start) >> PAGE_SHIFT;
-
- args->start &= PAGE_MASK;
- args->end &= PAGE_MASK;
- if (!args->vma || is_vm_hugetlb_page(args->vma) ||
- (args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma))
- return -EINVAL;
- if (nr_pages <= 0)
- return -EINVAL;
- if (args->start < args->vma->vm_start ||
- args->start >= args->vma->vm_end)
- return -EINVAL;
- if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end)
- return -EINVAL;
- if (!args->src || !args->dst)
- return -EINVAL;
-
- memset(args->src, 0, sizeof(*args->src) * nr_pages);
- args->cpages = 0;
- args->npages = 0;
-
- migrate_vma_collect(args);
-
- if (args->cpages)
- migrate_vma_unmap(args);
-
- /*
- * At this point pages are locked and unmapped, and thus they have
- * stable content and can safely be copied to destination memory that
- * is allocated by the drivers.
- */
- return 0;
-
-}
-EXPORT_SYMBOL(migrate_vma_setup);
-
-/*
- * This code closely matches the code in:
- * __handle_mm_fault()
- * handle_pte_fault()
- * do_anonymous_page()
- * to map in an anonymous zero page but the struct page will be a ZONE_DEVICE
- * private page.
- */
-static void migrate_vma_insert_page(struct migrate_vma *migrate,
- unsigned long addr,
- struct page *page,
- unsigned long *src)
-{
- struct vm_area_struct *vma = migrate->vma;
- struct mm_struct *mm = vma->vm_mm;
- bool flush = false;
- spinlock_t *ptl;
- pte_t entry;
- pgd_t *pgdp;
- p4d_t *p4dp;
- pud_t *pudp;
- pmd_t *pmdp;
- pte_t *ptep;
-
- /* Only allow populating anonymous memory */
- if (!vma_is_anonymous(vma))
- goto abort;
-
- pgdp = pgd_offset(mm, addr);
- p4dp = p4d_alloc(mm, pgdp, addr);
- if (!p4dp)
- goto abort;
- pudp = pud_alloc(mm, p4dp, addr);
- if (!pudp)
- goto abort;
- pmdp = pmd_alloc(mm, pudp, addr);
- if (!pmdp)
- goto abort;
-
- if (pmd_trans_huge(*pmdp) || pmd_devmap(*pmdp))
- goto abort;
-
- /*
- * Use pte_alloc() instead of pte_alloc_map(). We can't run
- * pte_offset_map() on pmds where a huge pmd might be created
- * from a different thread.
- *
- * pte_alloc_map() is safe to use under mmap_write_lock(mm) or when
- * parallel threads are excluded by other means.
- *
- * Here we only have mmap_read_lock(mm).
- */
- if (pte_alloc(mm, pmdp))
- goto abort;
-
- /* See the comment in pte_alloc_one_map() */
- if (unlikely(pmd_trans_unstable(pmdp)))
- goto abort;
-
- if (unlikely(anon_vma_prepare(vma)))
- goto abort;
- if (mem_cgroup_charge(page_folio(page), vma->vm_mm, GFP_KERNEL))
- goto abort;
-
- /*
- * The memory barrier inside __SetPageUptodate makes sure that
- * preceding stores to the page contents become visible before
- * the set_pte_at() write.
- */
- __SetPageUptodate(page);
-
- if (is_zone_device_page(page)) {
- if (is_device_private_page(page)) {
- swp_entry_t swp_entry;
-
- if (vma->vm_flags & VM_WRITE)
- swp_entry = make_writable_device_private_entry(
- page_to_pfn(page));
- else
- swp_entry = make_readable_device_private_entry(
- page_to_pfn(page));
- entry = swp_entry_to_pte(swp_entry);
- } else {
- /*
- * For now we only support migrating to un-addressable
- * device memory.
- */
- pr_warn_once("Unsupported ZONE_DEVICE page type.\n");
- goto abort;
- }
- } else {
- entry = mk_pte(page, vma->vm_page_prot);
- if (vma->vm_flags & VM_WRITE)
- entry = pte_mkwrite(pte_mkdirty(entry));
- }
-
- ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
-
- if (check_stable_address_space(mm))
- goto unlock_abort;
-
- if (pte_present(*ptep)) {
- unsigned long pfn = pte_pfn(*ptep);
-
- if (!is_zero_pfn(pfn))
- goto unlock_abort;
- flush = true;
- } else if (!pte_none(*ptep))
- goto unlock_abort;
-
- /*
- * Check for userfaultfd but do not deliver the fault. Instead,
- * just back off.
- */
- if (userfaultfd_missing(vma))
- goto unlock_abort;
-
- inc_mm_counter(mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, addr, false);
- if (!is_zone_device_page(page))
- lru_cache_add_inactive_or_unevictable(page, vma);
- get_page(page);
-
- if (flush) {
- flush_cache_page(vma, addr, pte_pfn(*ptep));
- ptep_clear_flush_notify(vma, addr, ptep);
- set_pte_at_notify(mm, addr, ptep, entry);
- update_mmu_cache(vma, addr, ptep);
- } else {
- /* No need to invalidate - it was non-present before */
- set_pte_at(mm, addr, ptep, entry);
- update_mmu_cache(vma, addr, ptep);
- }
-
- pte_unmap_unlock(ptep, ptl);
- *src = MIGRATE_PFN_MIGRATE;
- return;
-
-unlock_abort:
- pte_unmap_unlock(ptep, ptl);
-abort:
- *src &= ~MIGRATE_PFN_MIGRATE;
-}
-
-/**
- * migrate_vma_pages() - migrate meta-data from src page to dst page
- * @migrate: migrate struct containing all migration information
- *
- * This migrates struct page meta-data from source struct page to destination
- * struct page. This effectively finishes the migration from source page to the
- * destination page.
- */
-void migrate_vma_pages(struct migrate_vma *migrate)
-{
- const unsigned long npages = migrate->npages;
- const unsigned long start = migrate->start;
- struct mmu_notifier_range range;
- unsigned long addr, i;
- bool notified = false;
-
- for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
- struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
- struct page *page = migrate_pfn_to_page(migrate->src[i]);
- struct address_space *mapping;
- int r;
-
- if (!newpage) {
- migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
- continue;
- }
-
- if (!page) {
- if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE))
- continue;
- if (!notified) {
- notified = true;
-
- mmu_notifier_range_init_owner(&range,
- MMU_NOTIFY_MIGRATE, 0, migrate->vma,
- migrate->vma->vm_mm, addr, migrate->end,
- migrate->pgmap_owner);
- mmu_notifier_invalidate_range_start(&range);
- }
- migrate_vma_insert_page(migrate, addr, newpage,
- &migrate->src[i]);
- continue;
- }
-
- mapping = page_mapping(page);
-
- if (is_zone_device_page(newpage)) {
- if (is_device_private_page(newpage)) {
- /*
- * For now only support private anonymous when
- * migrating to un-addressable device memory.
- */
- if (mapping) {
- migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
- continue;
- }
- } else {
- /*
- * Other types of ZONE_DEVICE page are not
- * supported.
- */
- migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
- continue;
- }
- }
-
- r = migrate_page(mapping, newpage, page, MIGRATE_SYNC_NO_COPY);
- if (r != MIGRATEPAGE_SUCCESS)
- migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
- }
-
- /*
- * No need to double call mmu_notifier->invalidate_range() callback as
- * the above ptep_clear_flush_notify() inside migrate_vma_insert_page()
- * did already call it.
- */
- if (notified)
- mmu_notifier_invalidate_range_only_end(&range);
-}
-EXPORT_SYMBOL(migrate_vma_pages);
-
-/**
- * migrate_vma_finalize() - restore CPU page table entry
- * @migrate: migrate struct containing all migration information
- *
- * This replaces the special migration pte entry with either a mapping to the
- * new page if migration was successful for that page, or to the original page
- * otherwise.
- *
- * This also unlocks the pages and puts them back on the lru, or drops the extra
- * refcount, for device pages.
- */
-void migrate_vma_finalize(struct migrate_vma *migrate)
-{
- const unsigned long npages = migrate->npages;
- unsigned long i;
-
- for (i = 0; i < npages; i++) {
- struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
- struct page *page = migrate_pfn_to_page(migrate->src[i]);
-
- if (!page) {
- if (newpage) {
- unlock_page(newpage);
- put_page(newpage);
- }
- continue;
- }
-
- if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE) || !newpage) {
- if (newpage) {
- unlock_page(newpage);
- put_page(newpage);
- }
- newpage = page;
- }
-
- remove_migration_ptes(page, newpage, false);
- unlock_page(page);
-
- if (is_zone_device_page(page))
- put_page(page);
- else
- putback_lru_page(page);
-
- if (newpage != page) {
- unlock_page(newpage);
- if (is_zone_device_page(newpage))
- put_page(newpage);
- else
- putback_lru_page(newpage);
- }
- }
-}
-EXPORT_SYMBOL(migrate_vma_finalize);
-#endif /* CONFIG_DEVICE_PRIVATE */
-
/*
* node_demotion[] example:
*
diff --git a/mm/migrate_device.c b/mm/migrate_device.c
new file mode 100644
index 000000000000..70c7dc05bbfc
--- /dev/null
+++ b/mm/migrate_device.c
@@ -0,0 +1,773 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Memory Migration functionality.
+ *
+ * Originally written by Jérôme Glisse.
+ */
+#include <linux/export.h>
+#include <linux/memremap.h>
+#include <linux/migrate.h>
+#include <linux/mm_inline.h>
+#include <linux/mmu_notifier.h>
+#include <linux/oom.h>
+#include <linux/pagewalk.h>
+#include <linux/rmap.h>
+#include <linux/swapops.h>
+#include <asm/tlbflush.h>
+#include "internal.h"
+
+static int migrate_vma_collect_skip(unsigned long start,
+ unsigned long end,
+ struct mm_walk *walk)
+{
+ struct migrate_vma *migrate = walk->private;
+ unsigned long addr;
+
+ for (addr = start; addr < end; addr += PAGE_SIZE) {
+ migrate->dst[migrate->npages] = 0;
+ migrate->src[migrate->npages++] = 0;
+ }
+
+ return 0;
+}
+
+static int migrate_vma_collect_hole(unsigned long start,
+ unsigned long end,
+ __always_unused int depth,
+ struct mm_walk *walk)
+{
+ struct migrate_vma *migrate = walk->private;
+ unsigned long addr;
+
+ /* Only allow populating anonymous memory. */
+ if (!vma_is_anonymous(walk->vma))
+ return migrate_vma_collect_skip(start, end, walk);
+
+ for (addr = start; addr < end; addr += PAGE_SIZE) {
+ migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE;
+ migrate->dst[migrate->npages] = 0;
+ migrate->npages++;
+ migrate->cpages++;
+ }
+
+ return 0;
+}
+
+static int migrate_vma_collect_pmd(pmd_t *pmdp,
+ unsigned long start,
+ unsigned long end,
+ struct mm_walk *walk)
+{
+ struct migrate_vma *migrate = walk->private;
+ struct vm_area_struct *vma = walk->vma;
+ struct mm_struct *mm = vma->vm_mm;
+ unsigned long addr = start, unmapped = 0;
+ spinlock_t *ptl;
+ pte_t *ptep;
+
+again:
+ if (pmd_none(*pmdp))
+ return migrate_vma_collect_hole(start, end, -1, walk);
+
+ if (pmd_trans_huge(*pmdp)) {
+ struct page *page;
+
+ ptl = pmd_lock(mm, pmdp);
+ if (unlikely(!pmd_trans_huge(*pmdp))) {
+ spin_unlock(ptl);
+ goto again;
+ }
+
+ page = pmd_page(*pmdp);
+ if (is_huge_zero_page(page)) {
+ spin_unlock(ptl);
+ split_huge_pmd(vma, pmdp, addr);
+ if (pmd_trans_unstable(pmdp))
+ return migrate_vma_collect_skip(start, end,
+ walk);
+ } else {
+ int ret;
+
+ get_page(page);
+ spin_unlock(ptl);
+ if (unlikely(!trylock_page(page)))
+ return migrate_vma_collect_skip(start, end,
+ walk);
+ ret = split_huge_page(page);
+ unlock_page(page);
+ put_page(page);
+ if (ret)
+ return migrate_vma_collect_skip(start, end,
+ walk);
+ if (pmd_none(*pmdp))
+ return migrate_vma_collect_hole(start, end, -1,
+ walk);
+ }
+ }
+
+ if (unlikely(pmd_bad(*pmdp)))
+ return migrate_vma_collect_skip(start, end, walk);
+
+ ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
+ arch_enter_lazy_mmu_mode();
+
+ for (; addr < end; addr += PAGE_SIZE, ptep++) {
+ unsigned long mpfn = 0, pfn;
+ struct page *page;
+ swp_entry_t entry;
+ pte_t pte;
+
+ pte = *ptep;
+
+ if (pte_none(pte)) {
+ if (vma_is_anonymous(vma)) {
+ mpfn = MIGRATE_PFN_MIGRATE;
+ migrate->cpages++;
+ }
+ goto next;
+ }
+
+ if (!pte_present(pte)) {
+ /*
+ * Only care about unaddressable device page special
+ * page table entry. Other special swap entries are not
+ * migratable, and we ignore regular swapped page.
+ */
+ entry = pte_to_swp_entry(pte);
+ if (!is_device_private_entry(entry))
+ goto next;
+
+ page = pfn_swap_entry_to_page(entry);
+ if (!(migrate->flags &
+ MIGRATE_VMA_SELECT_DEVICE_PRIVATE) ||
+ page->pgmap->owner != migrate->pgmap_owner)
+ goto next;
+
+ mpfn = migrate_pfn(page_to_pfn(page)) |
+ MIGRATE_PFN_MIGRATE;
+ if (is_writable_device_private_entry(entry))
+ mpfn |= MIGRATE_PFN_WRITE;
+ } else {
+ if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM))
+ goto next;
+ pfn = pte_pfn(pte);
+ if (is_zero_pfn(pfn)) {
+ mpfn = MIGRATE_PFN_MIGRATE;
+ migrate->cpages++;
+ goto next;
+ }
+ page = vm_normal_page(migrate->vma, addr, pte);
+ mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE;
+ mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
+ }
+
+ /* FIXME support THP */
+ if (!page || !page->mapping || PageTransCompound(page)) {
+ mpfn = 0;
+ goto next;
+ }
+
+ /*
+ * By getting a reference on the page we pin it and that blocks
+ * any kind of migration. Side effect is that it "freezes" the
+ * pte.
+ *
+ * We drop this reference after isolating the page from the lru
+ * for non device page (device page are not on the lru and thus
+ * can't be dropped from it).
+ */
+ get_page(page);
+
+ /*
+ * Optimize for the common case where page is only mapped once
+ * in one process. If we can lock the page, then we can safely
+ * set up a special migration page table entry now.
+ */
+ if (trylock_page(page)) {
+ pte_t swp_pte;
+
+ migrate->cpages++;
+ ptep_get_and_clear(mm, addr, ptep);
+
+ /* Setup special migration page table entry */
+ if (mpfn & MIGRATE_PFN_WRITE)
+ entry = make_writable_migration_entry(
+ page_to_pfn(page));
+ else
+ entry = make_readable_migration_entry(
+ page_to_pfn(page));
+ swp_pte = swp_entry_to_pte(entry);
+ if (pte_present(pte)) {
+ if (pte_soft_dirty(pte))
+ swp_pte = pte_swp_mksoft_dirty(swp_pte);
+ if (pte_uffd_wp(pte))
+ swp_pte = pte_swp_mkuffd_wp(swp_pte);
+ } else {
+ if (pte_swp_soft_dirty(pte))
+ swp_pte = pte_swp_mksoft_dirty(swp_pte);
+ if (pte_swp_uffd_wp(pte))
+ swp_pte = pte_swp_mkuffd_wp(swp_pte);
+ }
+ set_pte_at(mm, addr, ptep, swp_pte);
+
+ /*
+ * This is like regular unmap: we remove the rmap and
+ * drop page refcount. Page won't be freed, as we took
+ * a reference just above.
+ */
+ page_remove_rmap(page, vma, false);
+ put_page(page);
+
+ if (pte_present(pte))
+ unmapped++;
+ } else {
+ put_page(page);
+ mpfn = 0;
+ }
+
+next:
+ migrate->dst[migrate->npages] = 0;
+ migrate->src[migrate->npages++] = mpfn;
+ }
+ arch_leave_lazy_mmu_mode();
+ pte_unmap_unlock(ptep - 1, ptl);
+
+ /* Only flush the TLB if we actually modified any entries */
+ if (unmapped)
+ flush_tlb_range(walk->vma, start, end);
+
+ return 0;
+}
+
+static const struct mm_walk_ops migrate_vma_walk_ops = {
+ .pmd_entry = migrate_vma_collect_pmd,
+ .pte_hole = migrate_vma_collect_hole,
+};
+
+/*
+ * migrate_vma_collect() - collect pages over a range of virtual addresses
+ * @migrate: migrate struct containing all migration information
+ *
+ * This will walk the CPU page table. For each virtual address backed by a
+ * valid page, it updates the src array and takes a reference on the page, in
+ * order to pin the page until we lock it and unmap it.
+ */
+static void migrate_vma_collect(struct migrate_vma *migrate)
+{
+ struct mmu_notifier_range range;
+
+ /*
+ * Note that the pgmap_owner is passed to the mmu notifier callback so
+ * that the registered device driver can skip invalidating device
+ * private page mappings that won't be migrated.
+ */
+ mmu_notifier_range_init_owner(&range, MMU_NOTIFY_MIGRATE, 0,
+ migrate->vma, migrate->vma->vm_mm, migrate->start, migrate->end,
+ migrate->pgmap_owner);
+ mmu_notifier_invalidate_range_start(&range);
+
+ walk_page_range(migrate->vma->vm_mm, migrate->start, migrate->end,
+ &migrate_vma_walk_ops, migrate);
+
+ mmu_notifier_invalidate_range_end(&range);
+ migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
+}
+
+/*
+ * migrate_vma_check_page() - check if page is pinned or not
+ * @page: struct page to check
+ *
+ * Pinned pages cannot be migrated. This is the same test as in
+ * folio_migrate_mapping(), except that here we allow migration of a
+ * ZONE_DEVICE page.
+ */
+static bool migrate_vma_check_page(struct page *page)
+{
+ /*
+ * One extra ref because caller holds an extra reference, either from
+ * isolate_lru_page() for a regular page, or migrate_vma_collect() for
+ * a device page.
+ */
+ int extra = 1;
+
+ /*
+ * FIXME support THP (transparent huge page), it is bit more complex to
+ * check them than regular pages, because they can be mapped with a pmd
+ * or with a pte (split pte mapping).
+ */
+ if (PageCompound(page))
+ return false;
+
+ /* Page from ZONE_DEVICE have one extra reference */
+ if (is_zone_device_page(page))
+ extra++;
+
+ /* For file back page */
+ if (page_mapping(page))
+ extra += 1 + page_has_private(page);
+
+ if ((page_count(page) - extra) > page_mapcount(page))
+ return false;
+
+ return true;
+}
+
+/*
+ * migrate_vma_unmap() - replace page mapping with special migration pte entry
+ * @migrate: migrate struct containing all migration information
+ *
+ * Isolate pages from the LRU and replace mappings (CPU page table pte) with a
+ * special migration pte entry and check if it has been pinned. Pinned pages are
+ * restored because we cannot migrate them.
+ *
+ * This is the last step before we call the device driver callback to allocate
+ * destination memory and copy contents of original page over to new page.
+ */
+static void migrate_vma_unmap(struct migrate_vma *migrate)
+{
+ const unsigned long npages = migrate->npages;
+ unsigned long i, restore = 0;
+ bool allow_drain = true;
+
+ lru_add_drain();
+
+ for (i = 0; i < npages; i++) {
+ struct page *page = migrate_pfn_to_page(migrate->src[i]);
+ struct folio *folio;
+
+ if (!page)
+ continue;
+
+ /* ZONE_DEVICE pages are not on LRU */
+ if (!is_zone_device_page(page)) {
+ if (!PageLRU(page) && allow_drain) {
+ /* Drain CPU's pagevec */
+ lru_add_drain_all();
+ allow_drain = false;
+ }
+
+ if (isolate_lru_page(page)) {
+ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+ migrate->cpages--;
+ restore++;
+ continue;
+ }
+
+ /* Drop the reference we took in collect */
+ put_page(page);
+ }
+
+ folio = page_folio(page);
+ if (folio_mapped(folio))
+ try_to_migrate(folio, 0);
+
+ if (page_mapped(page) || !migrate_vma_check_page(page)) {
+ if (!is_zone_device_page(page)) {
+ get_page(page);
+ putback_lru_page(page);
+ }
+
+ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+ migrate->cpages--;
+ restore++;
+ continue;
+ }
+ }
+
+ for (i = 0; i < npages && restore; i++) {
+ struct page *page = migrate_pfn_to_page(migrate->src[i]);
+ struct folio *folio;
+
+ if (!page || (migrate->src[i] & MIGRATE_PFN_MIGRATE))
+ continue;
+
+ folio = page_folio(page);
+ remove_migration_ptes(folio, folio, false);
+
+ migrate->src[i] = 0;
+ folio_unlock(folio);
+ folio_put(folio);
+ restore--;
+ }
+}
+
+/**
+ * migrate_vma_setup() - prepare to migrate a range of memory
+ * @args: contains the vma, start, and pfns arrays for the migration
+ *
+ * Returns: negative errno on failures, 0 when 0 or more pages were migrated
+ * without an error.
+ *
+ * Prepare to migrate a range of memory virtual address range by collecting all
+ * the pages backing each virtual address in the range, saving them inside the
+ * src array. Then lock those pages and unmap them. Once the pages are locked
+ * and unmapped, check whether each page is pinned or not. Pages that aren't
+ * pinned have the MIGRATE_PFN_MIGRATE flag set (by this function) in the
+ * corresponding src array entry. Then restores any pages that are pinned, by
+ * remapping and unlocking those pages.
+ *
+ * The caller should then allocate destination memory and copy source memory to
+ * it for all those entries (ie with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE
+ * flag set). Once these are allocated and copied, the caller must update each
+ * corresponding entry in the dst array with the pfn value of the destination
+ * page and with MIGRATE_PFN_VALID. Destination pages must be locked via
+ * lock_page().
+ *
+ * Note that the caller does not have to migrate all the pages that are marked
+ * with MIGRATE_PFN_MIGRATE flag in src array unless this is a migration from
+ * device memory to system memory. If the caller cannot migrate a device page
+ * back to system memory, then it must return VM_FAULT_SIGBUS, which has severe
+ * consequences for the userspace process, so it must be avoided if at all
+ * possible.
+ *
+ * For empty entries inside CPU page table (pte_none() or pmd_none() is true) we
+ * do set MIGRATE_PFN_MIGRATE flag inside the corresponding source array thus
+ * allowing the caller to allocate device memory for those unbacked virtual
+ * addresses. For this the caller simply has to allocate device memory and
+ * properly set the destination entry like for regular migration. Note that
+ * this can still fail, and thus inside the device driver you must check if the
+ * migration was successful for those entries after calling migrate_vma_pages(),
+ * just like for regular migration.
+ *
+ * After that, the callers must call migrate_vma_pages() to go over each entry
+ * in the src array that has the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag
+ * set. If the corresponding entry in dst array has MIGRATE_PFN_VALID flag set,
+ * then migrate_vma_pages() to migrate struct page information from the source
+ * struct page to the destination struct page. If it fails to migrate the
+ * struct page information, then it clears the MIGRATE_PFN_MIGRATE flag in the
+ * src array.
+ *
+ * At this point all successfully migrated pages have an entry in the src
+ * array with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set and the dst
+ * array entry with MIGRATE_PFN_VALID flag set.
+ *
+ * Once migrate_vma_pages() returns the caller may inspect which pages were
+ * successfully migrated, and which were not. Successfully migrated pages will
+ * have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
+ *
+ * It is safe to update device page table after migrate_vma_pages() because
+ * both destination and source page are still locked, and the mmap_lock is held
+ * in read mode (hence no one can unmap the range being migrated).
+ *
+ * Once the caller is done cleaning up things and updating its page table (if it
+ * chose to do so, this is not an obligation) it finally calls
+ * migrate_vma_finalize() to update the CPU page table to point to new pages
+ * for successfully migrated pages or otherwise restore the CPU page table to
+ * point to the original source pages.
+ */
+int migrate_vma_setup(struct migrate_vma *args)
+{
+ long nr_pages = (args->end - args->start) >> PAGE_SHIFT;
+
+ args->start &= PAGE_MASK;
+ args->end &= PAGE_MASK;
+ if (!args->vma || is_vm_hugetlb_page(args->vma) ||
+ (args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma))
+ return -EINVAL;
+ if (nr_pages <= 0)
+ return -EINVAL;
+ if (args->start < args->vma->vm_start ||
+ args->start >= args->vma->vm_end)
+ return -EINVAL;
+ if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end)
+ return -EINVAL;
+ if (!args->src || !args->dst)
+ return -EINVAL;
+
+ memset(args->src, 0, sizeof(*args->src) * nr_pages);
+ args->cpages = 0;
+ args->npages = 0;
+
+ migrate_vma_collect(args);
+
+ if (args->cpages)
+ migrate_vma_unmap(args);
+
+ /*
+ * At this point pages are locked and unmapped, and thus they have
+ * stable content and can safely be copied to destination memory that
+ * is allocated by the drivers.
+ */
+ return 0;
+
+}
+EXPORT_SYMBOL(migrate_vma_setup);
+
+/*
+ * This code closely matches the code in:
+ * __handle_mm_fault()
+ * handle_pte_fault()
+ * do_anonymous_page()
+ * to map in an anonymous zero page but the struct page will be a ZONE_DEVICE
+ * private page.
+ */
+static void migrate_vma_insert_page(struct migrate_vma *migrate,
+ unsigned long addr,
+ struct page *page,
+ unsigned long *src)
+{
+ struct vm_area_struct *vma = migrate->vma;
+ struct mm_struct *mm = vma->vm_mm;
+ bool flush = false;
+ spinlock_t *ptl;
+ pte_t entry;
+ pgd_t *pgdp;
+ p4d_t *p4dp;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep;
+
+ /* Only allow populating anonymous memory */
+ if (!vma_is_anonymous(vma))
+ goto abort;
+
+ pgdp = pgd_offset(mm, addr);
+ p4dp = p4d_alloc(mm, pgdp, addr);
+ if (!p4dp)
+ goto abort;
+ pudp = pud_alloc(mm, p4dp, addr);
+ if (!pudp)
+ goto abort;
+ pmdp = pmd_alloc(mm, pudp, addr);
+ if (!pmdp)
+ goto abort;
+
+ if (pmd_trans_huge(*pmdp) || pmd_devmap(*pmdp))
+ goto abort;
+
+ /*
+ * Use pte_alloc() instead of pte_alloc_map(). We can't run
+ * pte_offset_map() on pmds where a huge pmd might be created
+ * from a different thread.
+ *
+ * pte_alloc_map() is safe to use under mmap_write_lock(mm) or when
+ * parallel threads are excluded by other means.
+ *
+ * Here we only have mmap_read_lock(mm).
+ */
+ if (pte_alloc(mm, pmdp))
+ goto abort;
+
+ /* See the comment in pte_alloc_one_map() */
+ if (unlikely(pmd_trans_unstable(pmdp)))
+ goto abort;
+
+ if (unlikely(anon_vma_prepare(vma)))
+ goto abort;
+ if (mem_cgroup_charge(page_folio(page), vma->vm_mm, GFP_KERNEL))
+ goto abort;
+
+ /*
+ * The memory barrier inside __SetPageUptodate makes sure that
+ * preceding stores to the page contents become visible before
+ * the set_pte_at() write.
+ */
+ __SetPageUptodate(page);
+
+ if (is_device_private_page(page)) {
+ swp_entry_t swp_entry;
+
+ if (vma->vm_flags & VM_WRITE)
+ swp_entry = make_writable_device_private_entry(
+ page_to_pfn(page));
+ else
+ swp_entry = make_readable_device_private_entry(
+ page_to_pfn(page));
+ entry = swp_entry_to_pte(swp_entry);
+ } else {
+ /*
+ * For now we only support migrating to un-addressable device
+ * memory.
+ */
+ if (is_zone_device_page(page)) {
+ pr_warn_once("Unsupported ZONE_DEVICE page type.\n");
+ goto abort;
+ }
+ entry = mk_pte(page, vma->vm_page_prot);
+ if (vma->vm_flags & VM_WRITE)
+ entry = pte_mkwrite(pte_mkdirty(entry));
+ }
+
+ ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
+
+ if (check_stable_address_space(mm))
+ goto unlock_abort;
+
+ if (pte_present(*ptep)) {
+ unsigned long pfn = pte_pfn(*ptep);
+
+ if (!is_zero_pfn(pfn))
+ goto unlock_abort;
+ flush = true;
+ } else if (!pte_none(*ptep))
+ goto unlock_abort;
+
+ /*
+ * Check for userfaultfd but do not deliver the fault. Instead,
+ * just back off.
+ */
+ if (userfaultfd_missing(vma))
+ goto unlock_abort;
+
+ inc_mm_counter(mm, MM_ANONPAGES);
+ page_add_new_anon_rmap(page, vma, addr, false);
+ if (!is_zone_device_page(page))
+ lru_cache_add_inactive_or_unevictable(page, vma);
+ get_page(page);
+
+ if (flush) {
+ flush_cache_page(vma, addr, pte_pfn(*ptep));
+ ptep_clear_flush_notify(vma, addr, ptep);
+ set_pte_at_notify(mm, addr, ptep, entry);
+ update_mmu_cache(vma, addr, ptep);
+ } else {
+ /* No need to invalidate - it was non-present before */
+ set_pte_at(mm, addr, ptep, entry);
+ update_mmu_cache(vma, addr, ptep);
+ }
+
+ pte_unmap_unlock(ptep, ptl);
+ *src = MIGRATE_PFN_MIGRATE;
+ return;
+
+unlock_abort:
+ pte_unmap_unlock(ptep, ptl);
+abort:
+ *src &= ~MIGRATE_PFN_MIGRATE;
+}
+
+/**
+ * migrate_vma_pages() - migrate meta-data from src page to dst page
+ * @migrate: migrate struct containing all migration information
+ *
+ * This migrates struct page meta-data from source struct page to destination
+ * struct page. This effectively finishes the migration from source page to the
+ * destination page.
+ */
+void migrate_vma_pages(struct migrate_vma *migrate)
+{
+ const unsigned long npages = migrate->npages;
+ const unsigned long start = migrate->start;
+ struct mmu_notifier_range range;
+ unsigned long addr, i;
+ bool notified = false;
+
+ for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
+ struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
+ struct page *page = migrate_pfn_to_page(migrate->src[i]);
+ struct address_space *mapping;
+ int r;
+
+ if (!newpage) {
+ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+ continue;
+ }
+
+ if (!page) {
+ if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE))
+ continue;
+ if (!notified) {
+ notified = true;
+
+ mmu_notifier_range_init_owner(&range,
+ MMU_NOTIFY_MIGRATE, 0, migrate->vma,
+ migrate->vma->vm_mm, addr, migrate->end,
+ migrate->pgmap_owner);
+ mmu_notifier_invalidate_range_start(&range);
+ }
+ migrate_vma_insert_page(migrate, addr, newpage,
+ &migrate->src[i]);
+ continue;
+ }
+
+ mapping = page_mapping(page);
+
+ if (is_device_private_page(newpage)) {
+ /*
+ * For now only support private anonymous when migrating
+ * to un-addressable device memory.
+ */
+ if (mapping) {
+ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+ continue;
+ }
+ } else if (is_zone_device_page(newpage)) {
+ /*
+ * Other types of ZONE_DEVICE page are not supported.
+ */
+ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+ continue;
+ }
+
+ r = migrate_page(mapping, newpage, page, MIGRATE_SYNC_NO_COPY);
+ if (r != MIGRATEPAGE_SUCCESS)
+ migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
+ }
+
+ /*
+ * No need to double call mmu_notifier->invalidate_range() callback as
+ * the above ptep_clear_flush_notify() inside migrate_vma_insert_page()
+ * did already call it.
+ */
+ if (notified)
+ mmu_notifier_invalidate_range_only_end(&range);
+}
+EXPORT_SYMBOL(migrate_vma_pages);
+
+/**
+ * migrate_vma_finalize() - restore CPU page table entry
+ * @migrate: migrate struct containing all migration information
+ *
+ * This replaces the special migration pte entry with either a mapping to the
+ * new page if migration was successful for that page, or to the original page
+ * otherwise.
+ *
+ * This also unlocks the pages and puts them back on the lru, or drops the extra
+ * refcount, for device pages.
+ */
+void migrate_vma_finalize(struct migrate_vma *migrate)
+{
+ const unsigned long npages = migrate->npages;
+ unsigned long i;
+
+ for (i = 0; i < npages; i++) {
+ struct folio *dst, *src;
+ struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
+ struct page *page = migrate_pfn_to_page(migrate->src[i]);
+
+ if (!page) {
+ if (newpage) {
+ unlock_page(newpage);
+ put_page(newpage);
+ }
+ continue;
+ }
+
+ if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE) || !newpage) {
+ if (newpage) {
+ unlock_page(newpage);
+ put_page(newpage);
+ }
+ newpage = page;
+ }
+
+ src = page_folio(page);
+ dst = page_folio(newpage);
+ remove_migration_ptes(src, dst, false);
+ folio_unlock(src);
+
+ if (is_zone_device_page(page))
+ put_page(page);
+ else
+ putback_lru_page(page);
+
+ if (newpage != page) {
+ unlock_page(newpage);
+ if (is_zone_device_page(newpage))
+ put_page(newpage);
+ else
+ putback_lru_page(newpage);
+ }
+ }
+}
+EXPORT_SYMBOL(migrate_vma_finalize);
diff --git a/mm/mlock.c b/mm/mlock.c
index 349e2cda8c50..efd2dd2943de 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -14,6 +14,7 @@
#include <linux/swapops.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
+#include <linux/pagewalk.h>
#include <linux/mempolicy.h>
#include <linux/syscalls.h>
#include <linux/sched.h>
@@ -27,6 +28,8 @@
#include "internal.h"
+static DEFINE_PER_CPU(struct pagevec, mlock_pvec);
+
bool can_do_mlock(void)
{
if (rlimit(RLIMIT_MEMLOCK) != 0)
@@ -46,441 +49,320 @@ EXPORT_SYMBOL(can_do_mlock);
* be placed on the LRU "unevictable" list, rather than the [in]active lists.
* The unevictable list is an LRU sibling list to the [in]active lists.
* PageUnevictable is set to indicate the unevictable state.
- *
- * When lazy mlocking via vmscan, it is important to ensure that the
- * vma's VM_LOCKED status is not concurrently being modified, otherwise we
- * may have mlocked a page that is being munlocked. So lazy mlock must take
- * the mmap_lock for read, and verify that the vma really is locked
- * (see mm/rmap.c).
*/
-/*
- * LRU accounting for clear_page_mlock()
- */
-void clear_page_mlock(struct page *page)
+static struct lruvec *__mlock_page(struct page *page, struct lruvec *lruvec)
{
- int nr_pages;
+ /* There is nothing more we can do while it's off LRU */
+ if (!TestClearPageLRU(page))
+ return lruvec;
- if (!TestClearPageMlocked(page))
- return;
+ lruvec = folio_lruvec_relock_irq(page_folio(page), lruvec);
- nr_pages = thp_nr_pages(page);
- mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
- count_vm_events(UNEVICTABLE_PGCLEARED, nr_pages);
- /*
- * The previous TestClearPageMlocked() corresponds to the smp_mb()
- * in __pagevec_lru_add_fn().
- *
- * See __pagevec_lru_add_fn for more explanation.
- */
- if (!isolate_lru_page(page)) {
- putback_lru_page(page);
- } else {
+ if (unlikely(page_evictable(page))) {
/*
- * We lost the race. the page already moved to evictable list.
+ * This is a little surprising, but quite possible:
+ * PageMlocked must have got cleared already by another CPU.
+ * Could this page be on the Unevictable LRU? I'm not sure,
+ * but move it now if so.
*/
- if (PageUnevictable(page))
- count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
+ if (PageUnevictable(page)) {
+ del_page_from_lru_list(page, lruvec);
+ ClearPageUnevictable(page);
+ add_page_to_lru_list(page, lruvec);
+ __count_vm_events(UNEVICTABLE_PGRESCUED,
+ thp_nr_pages(page));
+ }
+ goto out;
}
+
+ if (PageUnevictable(page)) {
+ if (PageMlocked(page))
+ page->mlock_count++;
+ goto out;
+ }
+
+ del_page_from_lru_list(page, lruvec);
+ ClearPageActive(page);
+ SetPageUnevictable(page);
+ page->mlock_count = !!PageMlocked(page);
+ add_page_to_lru_list(page, lruvec);
+ __count_vm_events(UNEVICTABLE_PGCULLED, thp_nr_pages(page));
+out:
+ SetPageLRU(page);
+ return lruvec;
}
-/*
- * Mark page as mlocked if not already.
- * If page on LRU, isolate and putback to move to unevictable list.
- */
-void mlock_vma_page(struct page *page)
+static struct lruvec *__mlock_new_page(struct page *page, struct lruvec *lruvec)
{
- /* Serialize with page migration */
- BUG_ON(!PageLocked(page));
+ VM_BUG_ON_PAGE(PageLRU(page), page);
- VM_BUG_ON_PAGE(PageTail(page), page);
- VM_BUG_ON_PAGE(PageCompound(page) && PageDoubleMap(page), page);
+ lruvec = folio_lruvec_relock_irq(page_folio(page), lruvec);
- if (!TestSetPageMlocked(page)) {
- int nr_pages = thp_nr_pages(page);
+ /* As above, this is a little surprising, but possible */
+ if (unlikely(page_evictable(page)))
+ goto out;
- mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
- count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
- if (!isolate_lru_page(page))
- putback_lru_page(page);
- }
+ SetPageUnevictable(page);
+ page->mlock_count = !!PageMlocked(page);
+ __count_vm_events(UNEVICTABLE_PGCULLED, thp_nr_pages(page));
+out:
+ add_page_to_lru_list(page, lruvec);
+ SetPageLRU(page);
+ return lruvec;
}
-/*
- * Finish munlock after successful page isolation
- *
- * Page must be locked. This is a wrapper for page_mlock()
- * and putback_lru_page() with munlock accounting.
- */
-static void __munlock_isolated_page(struct page *page)
+static struct lruvec *__munlock_page(struct page *page, struct lruvec *lruvec)
{
- /*
- * Optimization: if the page was mapped just once, that's our mapping
- * and we don't need to check all the other vmas.
- */
- if (page_mapcount(page) > 1)
- page_mlock(page);
+ int nr_pages = thp_nr_pages(page);
+ bool isolated = false;
+
+ if (!TestClearPageLRU(page))
+ goto munlock;
- /* Did try_to_unlock() succeed or punt? */
- if (!PageMlocked(page))
- count_vm_events(UNEVICTABLE_PGMUNLOCKED, thp_nr_pages(page));
+ isolated = true;
+ lruvec = folio_lruvec_relock_irq(page_folio(page), lruvec);
- putback_lru_page(page);
+ if (PageUnevictable(page)) {
+ /* Then mlock_count is maintained, but might undercount */
+ if (page->mlock_count)
+ page->mlock_count--;
+ if (page->mlock_count)
+ goto out;
+ }
+ /* else assume that was the last mlock: reclaim will fix it if not */
+
+munlock:
+ if (TestClearPageMlocked(page)) {
+ __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
+ if (isolated || !PageUnevictable(page))
+ __count_vm_events(UNEVICTABLE_PGMUNLOCKED, nr_pages);
+ else
+ __count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
+ }
+
+ /* page_evictable() has to be checked *after* clearing Mlocked */
+ if (isolated && PageUnevictable(page) && page_evictable(page)) {
+ del_page_from_lru_list(page, lruvec);
+ ClearPageUnevictable(page);
+ add_page_to_lru_list(page, lruvec);
+ __count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
+ }
+out:
+ if (isolated)
+ SetPageLRU(page);
+ return lruvec;
}
/*
- * Accounting for page isolation fail during munlock
- *
- * Performs accounting when page isolation fails in munlock. There is nothing
- * else to do because it means some other task has already removed the page
- * from the LRU. putback_lru_page() will take care of removing the page from
- * the unevictable list, if necessary. vmscan [page_referenced()] will move
- * the page back to the unevictable list if some other vma has it mlocked.
+ * Flags held in the low bits of a struct page pointer on the mlock_pvec.
*/
-static void __munlock_isolation_failed(struct page *page)
+#define LRU_PAGE 0x1
+#define NEW_PAGE 0x2
+static inline struct page *mlock_lru(struct page *page)
{
- int nr_pages = thp_nr_pages(page);
+ return (struct page *)((unsigned long)page + LRU_PAGE);
+}
- if (PageUnevictable(page))
- __count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
- else
- __count_vm_events(UNEVICTABLE_PGMUNLOCKED, nr_pages);
+static inline struct page *mlock_new(struct page *page)
+{
+ return (struct page *)((unsigned long)page + NEW_PAGE);
}
-/**
- * munlock_vma_page - munlock a vma page
- * @page: page to be unlocked, either a normal page or THP page head
- *
- * returns the size of the page as a page mask (0 for normal page,
- * HPAGE_PMD_NR - 1 for THP head page)
- *
- * called from munlock()/munmap() path with page supposedly on the LRU.
- * When we munlock a page, because the vma where we found the page is being
- * munlock()ed or munmap()ed, we want to check whether other vmas hold the
- * page locked so that we can leave it on the unevictable lru list and not
- * bother vmscan with it. However, to walk the page's rmap list in
- * page_mlock() we must isolate the page from the LRU. If some other
- * task has removed the page from the LRU, we won't be able to do that.
- * So we clear the PageMlocked as we might not get another chance. If we
- * can't isolate the page, we leave it for putback_lru_page() and vmscan
- * [page_referenced()/try_to_unmap()] to deal with.
+/*
+ * mlock_pagevec() is derived from pagevec_lru_move_fn():
+ * perhaps that can make use of such page pointer flags in future,
+ * but for now just keep it for mlock. We could use three separate
+ * pagevecs instead, but one feels better (munlocking a full pagevec
+ * does not need to drain mlocking pagevecs first).
*/
-unsigned int munlock_vma_page(struct page *page)
+static void mlock_pagevec(struct pagevec *pvec)
{
- int nr_pages;
-
- /* For page_mlock() and to serialize with page migration */
- BUG_ON(!PageLocked(page));
- VM_BUG_ON_PAGE(PageTail(page), page);
+ struct lruvec *lruvec = NULL;
+ unsigned long mlock;
+ struct page *page;
+ int i;
- if (!TestClearPageMlocked(page)) {
- /* Potentially, PTE-mapped THP: do not skip the rest PTEs */
- return 0;
+ for (i = 0; i < pagevec_count(pvec); i++) {
+ page = pvec->pages[i];
+ mlock = (unsigned long)page & (LRU_PAGE | NEW_PAGE);
+ page = (struct page *)((unsigned long)page - mlock);
+ pvec->pages[i] = page;
+
+ if (mlock & LRU_PAGE)
+ lruvec = __mlock_page(page, lruvec);
+ else if (mlock & NEW_PAGE)
+ lruvec = __mlock_new_page(page, lruvec);
+ else
+ lruvec = __munlock_page(page, lruvec);
}
- nr_pages = thp_nr_pages(page);
- mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
+ if (lruvec)
+ unlock_page_lruvec_irq(lruvec);
+ release_pages(pvec->pages, pvec->nr);
+ pagevec_reinit(pvec);
+}
- if (!isolate_lru_page(page))
- __munlock_isolated_page(page);
- else
- __munlock_isolation_failed(page);
+void mlock_page_drain(int cpu)
+{
+ struct pagevec *pvec;
- return nr_pages - 1;
+ pvec = &per_cpu(mlock_pvec, cpu);
+ if (pagevec_count(pvec))
+ mlock_pagevec(pvec);
}
-/*
- * convert get_user_pages() return value to posix mlock() error
- */
-static int __mlock_posix_error_return(long retval)
+bool need_mlock_page_drain(int cpu)
{
- if (retval == -EFAULT)
- retval = -ENOMEM;
- else if (retval == -ENOMEM)
- retval = -EAGAIN;
- return retval;
+ return pagevec_count(&per_cpu(mlock_pvec, cpu));
}
-/*
- * Prepare page for fast batched LRU putback via putback_lru_evictable_pagevec()
- *
- * The fast path is available only for evictable pages with single mapping.
- * Then we can bypass the per-cpu pvec and get better performance.
- * when mapcount > 1 we need page_mlock() which can fail.
- * when !page_evictable(), we need the full redo logic of putback_lru_page to
- * avoid leaving evictable page in unevictable list.
- *
- * In case of success, @page is added to @pvec and @pgrescued is incremented
- * in case that the page was previously unevictable. @page is also unlocked.
+/**
+ * mlock_folio - mlock a folio already on (or temporarily off) LRU
+ * @folio: folio to be mlocked.
*/
-static bool __putback_lru_fast_prepare(struct page *page, struct pagevec *pvec,
- int *pgrescued)
+void mlock_folio(struct folio *folio)
{
- VM_BUG_ON_PAGE(PageLRU(page), page);
- VM_BUG_ON_PAGE(!PageLocked(page), page);
+ struct pagevec *pvec = &get_cpu_var(mlock_pvec);
- if (page_mapcount(page) <= 1 && page_evictable(page)) {
- pagevec_add(pvec, page);
- if (TestClearPageUnevictable(page))
- (*pgrescued)++;
- unlock_page(page);
- return true;
+ if (!folio_test_set_mlocked(folio)) {
+ int nr_pages = folio_nr_pages(folio);
+
+ zone_stat_mod_folio(folio, NR_MLOCK, nr_pages);
+ __count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
}
- return false;
+ folio_get(folio);
+ if (!pagevec_add(pvec, mlock_lru(&folio->page)) ||
+ folio_test_large(folio) || lru_cache_disabled())
+ mlock_pagevec(pvec);
+ put_cpu_var(mlock_pvec);
}
-/*
- * Putback multiple evictable pages to the LRU
- *
- * Batched putback of evictable pages that bypasses the per-cpu pvec. Some of
- * the pages might have meanwhile become unevictable but that is OK.
+/**
+ * mlock_new_page - mlock a newly allocated page not yet on LRU
+ * @page: page to be mlocked, either a normal page or a THP head.
*/
-static void __putback_lru_fast(struct pagevec *pvec, int pgrescued)
+void mlock_new_page(struct page *page)
{
- count_vm_events(UNEVICTABLE_PGMUNLOCKED, pagevec_count(pvec));
- /*
- *__pagevec_lru_add() calls release_pages() so we don't call
- * put_page() explicitly
- */
- __pagevec_lru_add(pvec);
- count_vm_events(UNEVICTABLE_PGRESCUED, pgrescued);
+ struct pagevec *pvec = &get_cpu_var(mlock_pvec);
+ int nr_pages = thp_nr_pages(page);
+
+ SetPageMlocked(page);
+ mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
+ __count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
+
+ get_page(page);
+ if (!pagevec_add(pvec, mlock_new(page)) ||
+ PageHead(page) || lru_cache_disabled())
+ mlock_pagevec(pvec);
+ put_cpu_var(mlock_pvec);
}
-/*
- * Munlock a batch of pages from the same zone
- *
- * The work is split to two main phases. First phase clears the Mlocked flag
- * and attempts to isolate the pages, all under a single zone lru lock.
- * The second phase finishes the munlock only for pages where isolation
- * succeeded.
- *
- * Note that the pagevec may be modified during the process.
+/**
+ * munlock_page - munlock a page
+ * @page: page to be munlocked, either a normal page or a THP head.
*/
-static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
+void munlock_page(struct page *page)
{
- int i;
- int nr = pagevec_count(pvec);
- int delta_munlocked = -nr;
- struct pagevec pvec_putback;
- struct lruvec *lruvec = NULL;
- int pgrescued = 0;
-
- pagevec_init(&pvec_putback);
-
- /* Phase 1: page isolation */
- for (i = 0; i < nr; i++) {
- struct page *page = pvec->pages[i];
- struct folio *folio = page_folio(page);
-
- if (TestClearPageMlocked(page)) {
- /*
- * We already have pin from follow_page_mask()
- * so we can spare the get_page() here.
- */
- if (TestClearPageLRU(page)) {
- lruvec = folio_lruvec_relock_irq(folio, lruvec);
- del_page_from_lru_list(page, lruvec);
- continue;
- } else
- __munlock_isolation_failed(page);
- } else {
- delta_munlocked++;
- }
-
- /*
- * We won't be munlocking this page in the next phase
- * but we still need to release the follow_page_mask()
- * pin. We cannot do it under lru_lock however. If it's
- * the last pin, __page_cache_release() would deadlock.
- */
- pagevec_add(&pvec_putback, pvec->pages[i]);
- pvec->pages[i] = NULL;
- }
- if (lruvec) {
- __mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
- unlock_page_lruvec_irq(lruvec);
- } else if (delta_munlocked) {
- mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
- }
-
- /* Now we can release pins of pages that we are not munlocking */
- pagevec_release(&pvec_putback);
-
- /* Phase 2: page munlock */
- for (i = 0; i < nr; i++) {
- struct page *page = pvec->pages[i];
-
- if (page) {
- lock_page(page);
- if (!__putback_lru_fast_prepare(page, &pvec_putback,
- &pgrescued)) {
- /*
- * Slow path. We don't want to lose the last
- * pin before unlock_page()
- */
- get_page(page); /* for putback_lru_page() */
- __munlock_isolated_page(page);
- unlock_page(page);
- put_page(page); /* from follow_page_mask() */
- }
- }
- }
+ struct pagevec *pvec = &get_cpu_var(mlock_pvec);
/*
- * Phase 3: page putback for pages that qualified for the fast path
- * This will also call put_page() to return pin from follow_page_mask()
+ * TestClearPageMlocked(page) must be left to __munlock_page(),
+ * which will check whether the page is multiply mlocked.
*/
- if (pagevec_count(&pvec_putback))
- __putback_lru_fast(&pvec_putback, pgrescued);
+
+ get_page(page);
+ if (!pagevec_add(pvec, page) ||
+ PageHead(page) || lru_cache_disabled())
+ mlock_pagevec(pvec);
+ put_cpu_var(mlock_pvec);
}
-/*
- * Fill up pagevec for __munlock_pagevec using pte walk
- *
- * The function expects that the struct page corresponding to @start address is
- * a non-TPH page already pinned and in the @pvec, and that it belongs to @zone.
- *
- * The rest of @pvec is filled by subsequent pages within the same pmd and same
- * zone, as long as the pte's are present and vm_normal_page() succeeds. These
- * pages also get pinned.
- *
- * Returns the address of the next page that should be scanned. This equals
- * @start + PAGE_SIZE when no page could be added by the pte walk.
- */
-static unsigned long __munlock_pagevec_fill(struct pagevec *pvec,
- struct vm_area_struct *vma, struct zone *zone,
- unsigned long start, unsigned long end)
+static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, struct mm_walk *walk)
+
{
- pte_t *pte;
+ struct vm_area_struct *vma = walk->vma;
spinlock_t *ptl;
+ pte_t *start_pte, *pte;
+ struct page *page;
- /*
- * Initialize pte walk starting at the already pinned page where we
- * are sure that there is a pte, as it was pinned under the same
- * mmap_lock write op.
- */
- pte = get_locked_pte(vma->vm_mm, start, &ptl);
- /* Make sure we do not cross the page table boundary */
- end = pgd_addr_end(start, end);
- end = p4d_addr_end(start, end);
- end = pud_addr_end(start, end);
- end = pmd_addr_end(start, end);
-
- /* The page next to the pinned page is the first we will try to get */
- start += PAGE_SIZE;
- while (start < end) {
- struct page *page = NULL;
- pte++;
- if (pte_present(*pte))
- page = vm_normal_page(vma, start, *pte);
- /*
- * Break if page could not be obtained or the page's node+zone does not
- * match
- */
- if (!page || page_zone(page) != zone)
- break;
+ ptl = pmd_trans_huge_lock(pmd, vma);
+ if (ptl) {
+ if (!pmd_present(*pmd))
+ goto out;
+ if (is_huge_zero_pmd(*pmd))
+ goto out;
+ page = pmd_page(*pmd);
+ if (vma->vm_flags & VM_LOCKED)
+ mlock_folio(page_folio(page));
+ else
+ munlock_page(page);
+ goto out;
+ }
- /*
- * Do not use pagevec for PTE-mapped THP,
- * munlock_vma_pages_range() will handle them.
- */
+ start_pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+ for (pte = start_pte; addr != end; pte++, addr += PAGE_SIZE) {
+ if (!pte_present(*pte))
+ continue;
+ page = vm_normal_page(vma, addr, *pte);
+ if (!page)
+ continue;
if (PageTransCompound(page))
- break;
-
- get_page(page);
- /*
- * Increase the address that will be returned *before* the
- * eventual break due to pvec becoming full by adding the page
- */
- start += PAGE_SIZE;
- if (pagevec_add(pvec, page) == 0)
- break;
+ continue;
+ if (vma->vm_flags & VM_LOCKED)
+ mlock_folio(page_folio(page));
+ else
+ munlock_page(page);
}
- pte_unmap_unlock(pte, ptl);
- return start;
+ pte_unmap(start_pte);
+out:
+ spin_unlock(ptl);
+ cond_resched();
+ return 0;
}
/*
- * munlock_vma_pages_range() - munlock all pages in the vma range.'
- * @vma - vma containing range to be munlock()ed.
+ * mlock_vma_pages_range() - mlock any pages already in the range,
+ * or munlock all pages in the range.
+ * @vma - vma containing range to be mlock()ed or munlock()ed
* @start - start address in @vma of the range
- * @end - end of range in @vma.
+ * @end - end of range in @vma
+ * @newflags - the new set of flags for @vma.
*
- * For mremap(), munmap() and exit().
- *
- * Called with @vma VM_LOCKED.
- *
- * Returns with VM_LOCKED cleared. Callers must be prepared to
- * deal with this.
- *
- * We don't save and restore VM_LOCKED here because pages are
- * still on lru. In unmap path, pages might be scanned by reclaim
- * and re-mlocked by page_mlock/try_to_unmap before we unmap and
- * free them. This will result in freeing mlocked pages.
+ * Called for mlock(), mlock2() and mlockall(), to set @vma VM_LOCKED;
+ * called for munlock() and munlockall(), to clear VM_LOCKED from @vma.
*/
-void munlock_vma_pages_range(struct vm_area_struct *vma,
- unsigned long start, unsigned long end)
+static void mlock_vma_pages_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end, vm_flags_t newflags)
{
- vma->vm_flags &= VM_LOCKED_CLEAR_MASK;
+ static const struct mm_walk_ops mlock_walk_ops = {
+ .pmd_entry = mlock_pte_range,
+ };
- while (start < end) {
- struct page *page;
- unsigned int page_mask = 0;
- unsigned long page_increm;
- struct pagevec pvec;
- struct zone *zone;
+ /*
+ * There is a slight chance that concurrent page migration,
+ * or page reclaim finding a page of this now-VM_LOCKED vma,
+ * will call mlock_vma_page() and raise page's mlock_count:
+ * double counting, leaving the page unevictable indefinitely.
+ * Communicate this danger to mlock_vma_page() with VM_IO,
+ * which is a VM_SPECIAL flag not allowed on VM_LOCKED vmas.
+ * mmap_lock is held in write mode here, so this weird
+ * combination should not be visible to other mmap_lock users;
+ * but WRITE_ONCE so rmap walkers must see VM_IO if VM_LOCKED.
+ */
+ if (newflags & VM_LOCKED)
+ newflags |= VM_IO;
+ WRITE_ONCE(vma->vm_flags, newflags);
- pagevec_init(&pvec);
- /*
- * Although FOLL_DUMP is intended for get_dump_page(),
- * it just so happens that its special treatment of the
- * ZERO_PAGE (returning an error instead of doing get_page)
- * suits munlock very well (and if somehow an abnormal page
- * has sneaked into the range, we won't oops here: great).
- */
- page = follow_page(vma, start, FOLL_GET | FOLL_DUMP);
-
- if (page && !IS_ERR(page)) {
- if (PageTransTail(page)) {
- VM_BUG_ON_PAGE(PageMlocked(page), page);
- put_page(page); /* follow_page_mask() */
- } else if (PageTransHuge(page)) {
- lock_page(page);
- /*
- * Any THP page found by follow_page_mask() may
- * have gotten split before reaching
- * munlock_vma_page(), so we need to compute
- * the page_mask here instead.
- */
- page_mask = munlock_vma_page(page);
- unlock_page(page);
- put_page(page); /* follow_page_mask() */
- } else {
- /*
- * Non-huge pages are handled in batches via
- * pagevec. The pin from follow_page_mask()
- * prevents them from collapsing by THP.
- */
- pagevec_add(&pvec, page);
- zone = page_zone(page);
-
- /*
- * Try to fill the rest of pagevec using fast
- * pte walk. This will also update start to
- * the next page to process. Then munlock the
- * pagevec.
- */
- start = __munlock_pagevec_fill(&pvec, vma,
- zone, start, end);
- __munlock_pagevec(&pvec, zone);
- goto next;
- }
- }
- page_increm = 1 + page_mask;
- start += page_increm * PAGE_SIZE;
-next:
- cond_resched();
+ lru_add_drain();
+ walk_page_range(vma->vm_mm, start, end, &mlock_walk_ops, NULL);
+ lru_add_drain();
+
+ if (newflags & VM_IO) {
+ newflags &= ~VM_IO;
+ WRITE_ONCE(vma->vm_flags, newflags);
}
}
@@ -500,10 +382,9 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
pgoff_t pgoff;
int nr_pages;
int ret = 0;
- int lock = !!(newflags & VM_LOCKED);
- vm_flags_t old_flags = vma->vm_flags;
+ vm_flags_t oldflags = vma->vm_flags;
- if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) ||
+ if (newflags == oldflags || (oldflags & VM_SPECIAL) ||
is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm) ||
vma_is_dax(vma) || vma_is_secretmem(vma))
/* don't set VM_LOCKED or VM_LOCKONFAULT and don't count */
@@ -535,9 +416,9 @@ success:
* Keep track of amount of locked VM.
*/
nr_pages = (end - start) >> PAGE_SHIFT;
- if (!lock)
+ if (!(newflags & VM_LOCKED))
nr_pages = -nr_pages;
- else if (old_flags & VM_LOCKED)
+ else if (oldflags & VM_LOCKED)
nr_pages = 0;
mm->locked_vm += nr_pages;
@@ -547,11 +428,12 @@ success:
* set VM_LOCKED, populate_vma_page_range will bring it back.
*/
- if (lock)
+ if ((newflags & VM_LOCKED) && (oldflags & VM_LOCKED)) {
+ /* No work to do, and mlocking twice would be wrong */
vma->vm_flags = newflags;
- else
- munlock_vma_pages_range(vma, start, end);
-
+ } else {
+ mlock_vma_pages_range(vma, start, end, newflags);
+ }
out:
*prev = vma;
return ret;
@@ -645,6 +527,18 @@ static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
return count >> PAGE_SHIFT;
}
+/*
+ * convert get_user_pages() return value to posix mlock() error
+ */
+static int __mlock_posix_error_return(long retval)
+{
+ if (retval == -EFAULT)
+ retval = -ENOMEM;
+ else if (retval == -ENOMEM)
+ retval = -EAGAIN;
+ return retval;
+}
+
static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
{
unsigned long locked;
diff --git a/mm/mmap.c b/mm/mmap.c
index bd3416eb5fbc..3aa839f81e63 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2672,6 +2672,8 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
vma->vm_prev = NULL;
do {
vma_rb_erase(vma, &mm->mm_rb);
+ if (vma->vm_flags & VM_LOCKED)
+ mm->locked_vm -= vma_pages(vma);
mm->map_count--;
tail_vma = vma;
vma = vma->vm_next;
@@ -2776,22 +2778,6 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
return __split_vma(mm, vma, addr, new_below);
}
-static inline void
-unlock_range(struct vm_area_struct *start, unsigned long limit)
-{
- struct mm_struct *mm = start->vm_mm;
- struct vm_area_struct *tmp = start;
-
- while (tmp && tmp->vm_start < limit) {
- if (tmp->vm_flags & VM_LOCKED) {
- mm->locked_vm -= vma_pages(tmp);
- munlock_vma_pages_all(tmp);
- }
-
- tmp = tmp->vm_next;
- }
-}
-
/* Munmap is split into 2 main parts -- this part which finds
* what needs doing, and the areas themselves, which do the
* work. This now handles partial unmappings.
@@ -2872,12 +2858,6 @@ int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
return error;
}
- /*
- * unlock any mlock()ed ranges before detaching vmas
- */
- if (mm->locked_vm)
- unlock_range(vma, end);
-
/* Detach vmas from rbtree */
if (!detach_vmas_to_be_unmapped(mm, vma, prev, end))
downgrade = false;
@@ -3145,20 +3125,12 @@ void exit_mmap(struct mm_struct *mm)
* Nothing can be holding mm->mmap_lock here and the above call
* to mmu_notifier_release(mm) ensures mmu notifier callbacks in
* __oom_reap_task_mm() will not block.
- *
- * This needs to be done before calling unlock_range(),
- * which clears VM_LOCKED, otherwise the oom reaper cannot
- * reliably test it.
*/
(void)__oom_reap_task_mm(mm);
-
set_bit(MMF_OOM_SKIP, &mm->flags);
}
mmap_write_lock(mm);
- if (mm->locked_vm)
- unlock_range(mm->mmap, ULONG_MAX);
-
arch_exit_mmap(mm);
vma = mm->mmap;
diff --git a/mm/mmzone.c b/mm/mmzone.c
index d8a9b0e1b526..0ae7571e35ab 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -81,6 +81,13 @@ void lruvec_init(struct lruvec *lruvec)
for_each_lru(lru)
INIT_LIST_HEAD(&lruvec->lists[lru]);
+ /*
+ * The "Unevictable LRU" is imaginary: though its size is maintained,
+ * it is never scanned, and unevictable pages are not threaded on it
+ * (so that their lru fields can be reused to hold mlock_count).
+ * Poison its list head, so that any operations on it would crash.
+ */
+ list_del(&lruvec->lists[LRU_UNEVICTABLE]);
}
#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 4db425eedbe8..7ec38194f8e1 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -523,7 +523,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
set_bit(MMF_UNSTABLE, &mm->flags);
for (vma = mm->mmap ; vma; vma = vma->vm_next) {
- if (!can_madv_lru_vma(vma))
+ if (vma->vm_flags & (VM_HUGETLB|VM_PFNMAP))
continue;
/*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 584ed4bac85e..6e0b4596cde9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -734,8 +734,7 @@ static void prep_compound_head(struct page *page, unsigned int order)
set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
set_compound_order(page, order);
atomic_set(compound_mapcount_ptr(page), -1);
- if (hpage_pincount_available(page))
- atomic_set(compound_pincount_ptr(page), 0);
+ atomic_set(compound_pincount_ptr(page), 0);
}
static void prep_compound_tail(struct page *head, int tail_idx)
diff --git a/mm/page_idle.c b/mm/page_idle.c
index edead6a8a5f9..fc0435abf909 100644
--- a/mm/page_idle.c
+++ b/mm/page_idle.c
@@ -13,6 +13,8 @@
#include <linux/page_ext.h>
#include <linux/page_idle.h>
+#include "internal.h"
+
#define BITMAP_CHUNK_SIZE sizeof(u64)
#define BITMAP_CHUNK_BITS (BITMAP_CHUNK_SIZE * BITS_PER_BYTE)
@@ -44,15 +46,11 @@ static struct page *page_idle_get_page(unsigned long pfn)
return page;
}
-static bool page_idle_clear_pte_refs_one(struct page *page,
+static bool page_idle_clear_pte_refs_one(struct folio *folio,
struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = addr,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
bool referenced = false;
while (page_vma_mapped_walk(&pvmw)) {
@@ -74,41 +72,41 @@ static bool page_idle_clear_pte_refs_one(struct page *page,
}
if (referenced) {
- clear_page_idle(page);
+ folio_clear_idle(folio);
/*
* We cleared the referenced bit in a mapping to this page. To
* avoid interference with page reclaim, mark it young so that
- * page_referenced() will return > 0.
+ * folio_referenced() will return > 0.
*/
- set_page_young(page);
+ folio_set_young(folio);
}
return true;
}
static void page_idle_clear_pte_refs(struct page *page)
{
+ struct folio *folio = page_folio(page);
/*
* Since rwc.arg is unused, rwc is effectively immutable, so we
* can make it static const to save some cycles and stack.
*/
static const struct rmap_walk_control rwc = {
.rmap_one = page_idle_clear_pte_refs_one,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
};
bool need_lock;
- if (!page_mapped(page) ||
- !page_rmapping(page))
+ if (!folio_mapped(folio) || !folio_raw_mapping(folio))
return;
- need_lock = !PageAnon(page) || PageKsm(page);
- if (need_lock && !trylock_page(page))
+ need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
+ if (need_lock && !folio_trylock(folio))
return;
- rmap_walk(page, (struct rmap_walk_control *)&rwc);
+ rmap_walk(folio, &rwc);
if (need_lock)
- unlock_page(page);
+ folio_unlock(folio);
}
static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index f7b331081791..1187f9c1ec5b 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -53,18 +53,6 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw)
return true;
}
-static inline bool pfn_is_match(struct page *page, unsigned long pfn)
-{
- unsigned long page_pfn = page_to_pfn(page);
-
- /* normal page and hugetlbfs page */
- if (!PageTransCompound(page) || PageHuge(page))
- return page_pfn == pfn;
-
- /* THP can be referenced by any subpage */
- return pfn >= page_pfn && pfn - page_pfn < thp_nr_pages(page);
-}
-
/**
* check_pte - check if @pvmw->page is mapped at the @pvmw->pte
* @pvmw: page_vma_mapped_walk struct, includes a pair pte and page for checking
@@ -116,7 +104,17 @@ static bool check_pte(struct page_vma_mapped_walk *pvmw)
pfn = pte_pfn(*pvmw->pte);
}
- return pfn_is_match(pvmw->page, pfn);
+ return (pfn - pvmw->pfn) < pvmw->nr_pages;
+}
+
+/* Returns true if the two ranges overlap. Careful to not overflow. */
+static bool check_pmd(unsigned long pfn, struct page_vma_mapped_walk *pvmw)
+{
+ if ((pfn + HPAGE_PMD_NR - 1) < pvmw->pfn)
+ return false;
+ if (pfn > pvmw->pfn + pvmw->nr_pages - 1)
+ return false;
+ return true;
}
static void step_forward(struct page_vma_mapped_walk *pvmw, unsigned long size)
@@ -127,7 +125,7 @@ static void step_forward(struct page_vma_mapped_walk *pvmw, unsigned long size)
}
/**
- * page_vma_mapped_walk - check if @pvmw->page is mapped in @pvmw->vma at
+ * page_vma_mapped_walk - check if @pvmw->pfn is mapped in @pvmw->vma at
* @pvmw->address
* @pvmw: pointer to struct page_vma_mapped_walk. page, vma, address and flags
* must be set. pmd, pte and ptl must be NULL.
@@ -152,8 +150,8 @@ static void step_forward(struct page_vma_mapped_walk *pvmw, unsigned long size)
*/
bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
{
- struct mm_struct *mm = pvmw->vma->vm_mm;
- struct page *page = pvmw->page;
+ struct vm_area_struct *vma = pvmw->vma;
+ struct mm_struct *mm = vma->vm_mm;
unsigned long end;
pgd_t *pgd;
p4d_t *p4d;
@@ -164,32 +162,26 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
if (pvmw->pmd && !pvmw->pte)
return not_found(pvmw);
- if (unlikely(PageHuge(page))) {
+ if (unlikely(is_vm_hugetlb_page(vma))) {
+ unsigned long size = pvmw->nr_pages * PAGE_SIZE;
/* The only possible mapping was handled on last iteration */
if (pvmw->pte)
return not_found(pvmw);
/* when pud is not present, pte will be NULL */
- pvmw->pte = huge_pte_offset(mm, pvmw->address, page_size(page));
+ pvmw->pte = huge_pte_offset(mm, pvmw->address, size);
if (!pvmw->pte)
return false;
- pvmw->ptl = huge_pte_lockptr(page_hstate(page), mm, pvmw->pte);
+ pvmw->ptl = huge_pte_lockptr(size_to_hstate(size), mm,
+ pvmw->pte);
spin_lock(pvmw->ptl);
if (!check_pte(pvmw))
return not_found(pvmw);
return true;
}
- /*
- * Seek to next pte only makes sense for THP.
- * But more important than that optimization, is to filter out
- * any PageKsm page: whose page->index misleads vma_address()
- * and vma_address_end() to disaster.
- */
- end = PageTransCompound(page) ?
- vma_address_end(page, pvmw->vma) :
- pvmw->address + PAGE_SIZE;
+ end = vma_address_end(pvmw);
if (pvmw->pte)
goto next_pte;
restart:
@@ -224,7 +216,7 @@ restart:
if (likely(pmd_trans_huge(pmde))) {
if (pvmw->flags & PVMW_MIGRATION)
return not_found(pvmw);
- if (pmd_page(pmde) != page)
+ if (!check_pmd(pmd_pfn(pmde), pvmw))
return not_found(pvmw);
return true;
}
@@ -236,7 +228,7 @@ restart:
return not_found(pvmw);
entry = pmd_to_swp_entry(pmde);
if (!is_migration_entry(entry) ||
- pfn_swap_entry_to_page(entry) != page)
+ !check_pmd(swp_offset(entry), pvmw))
return not_found(pvmw);
return true;
}
@@ -250,7 +242,8 @@ restart:
* cleared *pmd but not decremented compound_mapcount().
*/
if ((pvmw->flags & PVMW_SYNC) &&
- PageTransCompound(page)) {
+ transparent_hugepage_active(vma) &&
+ (pvmw->nr_pages >= HPAGE_PMD_NR)) {
spinlock_t *ptl = pmd_lock(mm, pvmw->pmd);
spin_unlock(ptl);
@@ -307,7 +300,8 @@ next_pte:
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
{
struct page_vma_mapped_walk pvmw = {
- .page = page,
+ .pfn = page_to_pfn(page),
+ .nr_pages = 1,
.vma = vma,
.flags = PVMW_SYNC,
};
diff --git a/mm/readahead.c b/mm/readahead.c
index f61943fd1741..21e5f9161cf2 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -262,7 +262,7 @@ static void read_pages(struct readahead_control *rac, struct list_head *pages,
blk_finish_plug(&plug);
- BUG_ON(!list_empty(pages));
+ BUG_ON(pages && !list_empty(pages));
BUG_ON(readahead_count(rac));
out:
@@ -361,7 +361,7 @@ EXPORT_SYMBOL_GPL(page_cache_ra_unbounded);
* behaviour which would occur if page allocations are causing VM writeback.
* We really don't want to intermingle reads and writes like that.
*/
-void do_page_cache_ra(struct readahead_control *ractl,
+static void do_page_cache_ra(struct readahead_control *ractl,
unsigned long nr_to_read, unsigned long lookahead_size)
{
struct inode *inode = ractl->mapping->host;
@@ -546,10 +546,102 @@ static int try_context_readahead(struct address_space *mapping,
}
/*
+ * There are some parts of the kernel which assume that PMD entries
+ * are exactly HPAGE_PMD_ORDER. Those should be fixed, but until then,
+ * limit the maximum allocation order to PMD size. I'm not aware of any
+ * assumptions about maximum order if THP are disabled, but 8 seems like
+ * a good order (that's 1MB if you're using 4kB pages)
+ */
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define MAX_PAGECACHE_ORDER HPAGE_PMD_ORDER
+#else
+#define MAX_PAGECACHE_ORDER 8
+#endif
+
+static inline int ra_alloc_folio(struct readahead_control *ractl, pgoff_t index,
+ pgoff_t mark, unsigned int order, gfp_t gfp)
+{
+ int err;
+ struct folio *folio = filemap_alloc_folio(gfp, order);
+
+ if (!folio)
+ return -ENOMEM;
+ if (mark - index < (1UL << order))
+ folio_set_readahead(folio);
+ err = filemap_add_folio(ractl->mapping, folio, index, gfp);
+ if (err)
+ folio_put(folio);
+ else
+ ractl->_nr_pages += 1UL << order;
+ return err;
+}
+
+void page_cache_ra_order(struct readahead_control *ractl,
+ struct file_ra_state *ra, unsigned int new_order)
+{
+ struct address_space *mapping = ractl->mapping;
+ pgoff_t index = readahead_index(ractl);
+ pgoff_t limit = (i_size_read(mapping->host) - 1) >> PAGE_SHIFT;
+ pgoff_t mark = index + ra->size - ra->async_size;
+ int err = 0;
+ gfp_t gfp = readahead_gfp_mask(mapping);
+
+ if (!mapping_large_folio_support(mapping) || ra->size < 4)
+ goto fallback;
+
+ limit = min(limit, index + ra->size - 1);
+
+ if (new_order < MAX_PAGECACHE_ORDER) {
+ new_order += 2;
+ if (new_order > MAX_PAGECACHE_ORDER)
+ new_order = MAX_PAGECACHE_ORDER;
+ while ((1 << new_order) > ra->size)
+ new_order--;
+ }
+
+ while (index <= limit) {
+ unsigned int order = new_order;
+
+ /* Align with smaller pages if needed */
+ if (index & ((1UL << order) - 1)) {
+ order = __ffs(index);
+ if (order == 1)
+ order = 0;
+ }
+ /* Don't allocate pages past EOF */
+ while (index + (1UL << order) - 1 > limit) {
+ if (--order == 1)
+ order = 0;
+ }
+ err = ra_alloc_folio(ractl, index, mark, order, gfp);
+ if (err)
+ break;
+ index += 1UL << order;
+ }
+
+ if (index > limit) {
+ ra->size += index - limit - 1;
+ ra->async_size += index - limit - 1;
+ }
+
+ read_pages(ractl, NULL, false);
+
+ /*
+ * If there were already pages in the page cache, then we may have
+ * left some gaps. Let the regular readahead code take care of this
+ * situation.
+ */
+ if (!err)
+ return;
+fallback:
+ do_page_cache_ra(ractl, ra->size, ra->async_size);
+}
+
+/*
* A minimal readahead algorithm for trivial sequential/random reads.
*/
static void ondemand_readahead(struct readahead_control *ractl,
- bool hit_readahead_marker, unsigned long req_size)
+ struct folio *folio, unsigned long req_size)
{
struct backing_dev_info *bdi = inode_to_bdi(ractl->mapping->host);
struct file_ra_state *ra = ractl->ra;
@@ -584,12 +676,12 @@ static void ondemand_readahead(struct readahead_control *ractl,
}
/*
- * Hit a marked page without valid readahead state.
+ * Hit a marked folio without valid readahead state.
* E.g. interleaved reads.
* Query the pagecache for async_size, which normally equals to
* readahead size. Ramp it up and use it as the new readahead size.
*/
- if (hit_readahead_marker) {
+ if (folio) {
pgoff_t start;
rcu_read_lock();
@@ -662,7 +754,7 @@ readit:
}
ractl->_index = ra->start;
- do_page_cache_ra(ractl, ra->size, ra->async_size);
+ page_cache_ra_order(ractl, ra, folio ? folio_order(folio) : 0);
}
void page_cache_sync_ra(struct readahead_control *ractl,
@@ -690,7 +782,7 @@ void page_cache_sync_ra(struct readahead_control *ractl,
}
/* do read-ahead */
- ondemand_readahead(ractl, false, req_count);
+ ondemand_readahead(ractl, NULL, req_count);
}
EXPORT_SYMBOL_GPL(page_cache_sync_ra);
@@ -713,7 +805,7 @@ void page_cache_async_ra(struct readahead_control *ractl,
return;
/* do read-ahead */
- ondemand_readahead(ractl, true, req_count);
+ ondemand_readahead(ractl, folio, req_count);
}
EXPORT_SYMBOL_GPL(page_cache_async_ra);
diff --git a/mm/rmap.c b/mm/rmap.c
index 66cb69c1c5dd..9bdca9308e2f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -107,15 +107,15 @@ static inline void anon_vma_free(struct anon_vma *anon_vma)
VM_BUG_ON(atomic_read(&anon_vma->refcount));
/*
- * Synchronize against page_lock_anon_vma_read() such that
+ * Synchronize against folio_lock_anon_vma_read() such that
* we can safely hold the lock without the anon_vma getting
* freed.
*
* Relies on the full mb implied by the atomic_dec_and_test() from
* put_anon_vma() against the acquire barrier implied by
- * down_read_trylock() from page_lock_anon_vma_read(). This orders:
+ * down_read_trylock() from folio_lock_anon_vma_read(). This orders:
*
- * page_lock_anon_vma_read() VS put_anon_vma()
+ * folio_lock_anon_vma_read() VS put_anon_vma()
* down_read_trylock() atomic_dec_and_test()
* LOCK MB
* atomic_read() rwsem_is_locked()
@@ -168,7 +168,7 @@ static void anon_vma_chain_link(struct vm_area_struct *vma,
* allocate a new one.
*
* Anon-vma allocations are very subtle, because we may have
- * optimistically looked up an anon_vma in page_lock_anon_vma_read()
+ * optimistically looked up an anon_vma in folio_lock_anon_vma_read()
* and that may actually touch the rwsem even in the newly
* allocated vma (it depends on RCU to make sure that the
* anon_vma isn't actually destroyed).
@@ -526,28 +526,28 @@ out:
* atomic op -- the trylock. If we fail the trylock, we fall back to getting a
* reference like with page_get_anon_vma() and then block on the mutex.
*/
-struct anon_vma *page_lock_anon_vma_read(struct page *page)
+struct anon_vma *folio_lock_anon_vma_read(struct folio *folio)
{
struct anon_vma *anon_vma = NULL;
struct anon_vma *root_anon_vma;
unsigned long anon_mapping;
rcu_read_lock();
- anon_mapping = (unsigned long)READ_ONCE(page->mapping);
+ anon_mapping = (unsigned long)READ_ONCE(folio->mapping);
if ((anon_mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
goto out;
- if (!page_mapped(page))
+ if (!folio_mapped(folio))
goto out;
anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
root_anon_vma = READ_ONCE(anon_vma->root);
if (down_read_trylock(&root_anon_vma->rwsem)) {
/*
- * If the page is still mapped, then this anon_vma is still
+ * If the folio is still mapped, then this anon_vma is still
* its anon_vma, and holding the mutex ensures that it will
* not go away, see anon_vma_free().
*/
- if (!page_mapped(page)) {
+ if (!folio_mapped(folio)) {
up_read(&root_anon_vma->rwsem);
anon_vma = NULL;
}
@@ -560,7 +560,7 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page)
goto out;
}
- if (!page_mapped(page)) {
+ if (!folio_mapped(folio)) {
rcu_read_unlock();
put_anon_vma(anon_vma);
return NULL;
@@ -737,8 +737,9 @@ static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags)
*/
unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
{
- if (PageAnon(page)) {
- struct anon_vma *page__anon_vma = page_anon_vma(page);
+ struct folio *folio = page_folio(page);
+ if (folio_test_anon(folio)) {
+ struct anon_vma *page__anon_vma = folio_anon_vma(folio);
/*
* Note: swapoff's unuse_vma() is more efficient with this
* check, and needs it to match anon_vma when KSM is active.
@@ -748,7 +749,7 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
return -EFAULT;
} else if (!vma->vm_file) {
return -EFAULT;
- } else if (vma->vm_file->f_mapping != compound_head(page)->mapping) {
+ } else if (vma->vm_file->f_mapping != folio->mapping) {
return -EFAULT;
}
@@ -789,30 +790,29 @@ out:
return pmd;
}
-struct page_referenced_arg {
+struct folio_referenced_arg {
int mapcount;
int referenced;
unsigned long vm_flags;
struct mem_cgroup *memcg;
};
/*
- * arg: page_referenced_arg will be passed
+ * arg: folio_referenced_arg will be passed
*/
-static bool page_referenced_one(struct page *page, struct vm_area_struct *vma,
- unsigned long address, void *arg)
+static bool folio_referenced_one(struct folio *folio,
+ struct vm_area_struct *vma, unsigned long address, void *arg)
{
- struct page_referenced_arg *pra = arg;
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = address,
- };
+ struct folio_referenced_arg *pra = arg;
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, address, 0);
int referenced = 0;
while (page_vma_mapped_walk(&pvmw)) {
address = pvmw.address;
- if (vma->vm_flags & VM_LOCKED) {
+ if ((vma->vm_flags & VM_LOCKED) &&
+ (!folio_test_large(folio) || !pvmw.pte)) {
+ /* Restore the mlock which got missed */
+ mlock_vma_folio(folio, vma, !pvmw.pte);
page_vma_mapped_walk_done(&pvmw);
pra->vm_flags |= VM_LOCKED;
return false; /* To break the loop */
@@ -824,10 +824,10 @@ static bool page_referenced_one(struct page *page, struct vm_area_struct *vma,
/*
* Don't treat a reference through
* a sequentially read mapping as such.
- * If the page has been used in another mapping,
+ * If the folio has been used in another mapping,
* we will catch it; if this other mapping is
* already gone, the unmap path will have set
- * PG_referenced or activated the page.
+ * the referenced flag or activated the folio.
*/
if (likely(!(vma->vm_flags & VM_SEQ_READ)))
referenced++;
@@ -837,7 +837,7 @@ static bool page_referenced_one(struct page *page, struct vm_area_struct *vma,
pvmw.pmd))
referenced++;
} else {
- /* unexpected pmd-mapped page? */
+ /* unexpected pmd-mapped folio? */
WARN_ON_ONCE(1);
}
@@ -845,13 +845,13 @@ static bool page_referenced_one(struct page *page, struct vm_area_struct *vma,
}
if (referenced)
- clear_page_idle(page);
- if (test_and_clear_page_young(page))
+ folio_clear_idle(folio);
+ if (folio_test_clear_young(folio))
referenced++;
if (referenced) {
pra->referenced++;
- pra->vm_flags |= vma->vm_flags;
+ pra->vm_flags |= vma->vm_flags & ~VM_LOCKED;
}
if (!pra->mapcount)
@@ -860,9 +860,9 @@ static bool page_referenced_one(struct page *page, struct vm_area_struct *vma,
return true;
}
-static bool invalid_page_referenced_vma(struct vm_area_struct *vma, void *arg)
+static bool invalid_folio_referenced_vma(struct vm_area_struct *vma, void *arg)
{
- struct page_referenced_arg *pra = arg;
+ struct folio_referenced_arg *pra = arg;
struct mem_cgroup *memcg = pra->memcg;
if (!mm_match_cgroup(vma->vm_mm, memcg))
@@ -872,40 +872,39 @@ static bool invalid_page_referenced_vma(struct vm_area_struct *vma, void *arg)
}
/**
- * page_referenced - test if the page was referenced
- * @page: the page to test
- * @is_locked: caller holds lock on the page
+ * folio_referenced() - Test if the folio was referenced.
+ * @folio: The folio to test.
+ * @is_locked: Caller holds lock on the folio.
* @memcg: target memory cgroup
- * @vm_flags: collect encountered vma->vm_flags who actually referenced the page
+ * @vm_flags: A combination of all the vma->vm_flags which referenced the folio.
*
- * Quick test_and_clear_referenced for all mappings to a page,
- * returns the number of ptes which referenced the page.
+ * Quick test_and_clear_referenced for all mappings of a folio,
+ *
+ * Return: The number of mappings which referenced the folio.
*/
-int page_referenced(struct page *page,
- int is_locked,
- struct mem_cgroup *memcg,
- unsigned long *vm_flags)
+int folio_referenced(struct folio *folio, int is_locked,
+ struct mem_cgroup *memcg, unsigned long *vm_flags)
{
int we_locked = 0;
- struct page_referenced_arg pra = {
- .mapcount = total_mapcount(page),
+ struct folio_referenced_arg pra = {
+ .mapcount = folio_mapcount(folio),
.memcg = memcg,
};
struct rmap_walk_control rwc = {
- .rmap_one = page_referenced_one,
+ .rmap_one = folio_referenced_one,
.arg = (void *)&pra,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
};
*vm_flags = 0;
if (!pra.mapcount)
return 0;
- if (!page_rmapping(page))
+ if (!folio_raw_mapping(folio))
return 0;
- if (!is_locked && (!PageAnon(page) || PageKsm(page))) {
- we_locked = trylock_page(page);
+ if (!is_locked && (!folio_test_anon(folio) || folio_test_ksm(folio))) {
+ we_locked = folio_trylock(folio);
if (!we_locked)
return 1;
}
@@ -916,37 +915,32 @@ int page_referenced(struct page *page,
* cgroups
*/
if (memcg) {
- rwc.invalid_vma = invalid_page_referenced_vma;
+ rwc.invalid_vma = invalid_folio_referenced_vma;
}
- rmap_walk(page, &rwc);
+ rmap_walk(folio, &rwc);
*vm_flags = pra.vm_flags;
if (we_locked)
- unlock_page(page);
+ folio_unlock(folio);
return pra.referenced;
}
-static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
+static bool page_mkclean_one(struct folio *folio, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = address,
- .flags = PVMW_SYNC,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, address, PVMW_SYNC);
struct mmu_notifier_range range;
int *cleaned = arg;
/*
* We have to assume the worse case ie pmd for invalidation. Note that
- * the page can not be free from this function.
+ * the folio can not be freed from this function.
*/
mmu_notifier_range_init(&range, MMU_NOTIFY_PROTECTION_PAGE,
0, vma, vma->vm_mm, address,
- vma_address_end(page, vma));
+ vma_address_end(&pvmw));
mmu_notifier_invalidate_range_start(&range);
while (page_vma_mapped_walk(&pvmw)) {
@@ -974,14 +968,14 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
if (!pmd_dirty(*pmd) && !pmd_write(*pmd))
continue;
- flush_cache_page(vma, address, page_to_pfn(page));
+ flush_cache_page(vma, address, folio_pfn(folio));
entry = pmdp_invalidate(vma, address, pmd);
entry = pmd_wrprotect(entry);
entry = pmd_mkclean(entry);
set_pmd_at(vma->vm_mm, address, pmd, entry);
ret = 1;
#else
- /* unexpected pmd-mapped page? */
+ /* unexpected pmd-mapped folio? */
WARN_ON_ONCE(1);
#endif
}
@@ -1029,7 +1023,7 @@ int folio_mkclean(struct folio *folio)
if (!mapping)
return 0;
- rmap_walk(&folio->page, &rwc);
+ rmap_walk(folio, &rwc);
return cleaned;
}
@@ -1057,8 +1051,8 @@ void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
/*
* Ensure that anon_vma and the PAGE_MAPPING_ANON bit are written
- * simultaneously, so a concurrent reader (eg page_referenced()'s
- * PageAnon()) will not see one without the other.
+ * simultaneously, so a concurrent reader (eg folio_referenced()'s
+ * folio_test_anon()) will not see one without the other.
*/
WRITE_ONCE(page->mapping, (struct address_space *) anon_vma);
}
@@ -1108,6 +1102,7 @@ static void __page_set_anon_rmap(struct page *page,
static void __page_check_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
+ struct folio *folio = page_folio(page);
/*
* The page's anon-rmap details (mapping and index) are guaranteed to
* be set up correctly at this point.
@@ -1119,7 +1114,8 @@ static void __page_check_anon_rmap(struct page *page,
* are initially only visible via the pagetables, and the pte is locked
* over the call to page_add_new_anon_rmap.
*/
- VM_BUG_ON_PAGE(page_anon_vma(page)->root != vma->anon_vma->root, page);
+ VM_BUG_ON_FOLIO(folio_anon_vma(folio)->root != vma->anon_vma->root,
+ folio);
VM_BUG_ON_PAGE(page_to_pgoff(page) != linear_page_index(vma, address),
page);
}
@@ -1181,17 +1177,17 @@ void do_page_add_anon_rmap(struct page *page,
__mod_lruvec_page_state(page, NR_ANON_MAPPED, nr);
}
- if (unlikely(PageKsm(page))) {
+ if (unlikely(PageKsm(page)))
unlock_page_memcg(page);
- return;
- }
/* address might be in next vma when migration races vma_adjust */
- if (first)
+ else if (first)
__page_set_anon_rmap(page, vma, address,
flags & RMAP_EXCLUSIVE);
else
__page_check_anon_rmap(page, vma, address);
+
+ mlock_vma_page(page, vma, compound);
}
/**
@@ -1216,8 +1212,7 @@ void page_add_new_anon_rmap(struct page *page,
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
/* increment count (starts at -1) */
atomic_set(compound_mapcount_ptr(page), 0);
- if (hpage_pincount_available(page))
- atomic_set(compound_pincount_ptr(page), 0);
+ atomic_set(compound_pincount_ptr(page), 0);
__mod_lruvec_page_state(page, NR_ANON_THPS, nr);
} else {
@@ -1232,12 +1227,14 @@ void page_add_new_anon_rmap(struct page *page,
/**
* page_add_file_rmap - add pte mapping to a file page
- * @page: the page to add the mapping to
- * @compound: charge the page as compound or small page
+ * @page: the page to add the mapping to
+ * @vma: the vm area in which the mapping is added
+ * @compound: charge the page as compound or small page
*
* The caller needs to hold the pte lock.
*/
-void page_add_file_rmap(struct page *page, bool compound)
+void page_add_file_rmap(struct page *page,
+ struct vm_area_struct *vma, bool compound)
{
int i, nr = 1;
@@ -1271,13 +1268,8 @@ void page_add_file_rmap(struct page *page, bool compound)
nr_pages);
} else {
if (PageTransCompound(page) && page_mapping(page)) {
- struct page *head = compound_head(page);
-
VM_WARN_ON_ONCE(!PageLocked(page));
-
- SetPageDoubleMap(head);
- if (PageMlocked(page))
- clear_page_mlock(head);
+ SetPageDoubleMap(compound_head(page));
}
if (!atomic_inc_and_test(&page->_mapcount))
goto out;
@@ -1285,6 +1277,8 @@ void page_add_file_rmap(struct page *page, bool compound)
__mod_lruvec_page_state(page, NR_FILE_MAPPED, nr);
out:
unlock_page_memcg(page);
+
+ mlock_vma_page(page, vma, compound);
}
static void page_remove_file_rmap(struct page *page, bool compound)
@@ -1327,9 +1321,6 @@ static void page_remove_file_rmap(struct page *page, bool compound)
* pte lock(a spinlock) is held, which implies preemption disabled.
*/
__mod_lruvec_page_state(page, NR_FILE_MAPPED, -nr);
-
- if (unlikely(PageMlocked(page)))
- clear_page_mlock(page);
}
static void page_remove_anon_compound_rmap(struct page *page)
@@ -1369,9 +1360,6 @@ static void page_remove_anon_compound_rmap(struct page *page)
nr = thp_nr_pages(page);
}
- if (unlikely(PageMlocked(page)))
- clear_page_mlock(page);
-
if (nr)
__mod_lruvec_page_state(page, NR_ANON_MAPPED, -nr);
}
@@ -1379,11 +1367,13 @@ static void page_remove_anon_compound_rmap(struct page *page)
/**
* page_remove_rmap - take down pte mapping from a page
* @page: page to remove mapping from
+ * @vma: the vm area from which the mapping is removed
* @compound: uncharge the page as compound or small page
*
* The caller needs to hold the pte lock.
*/
-void page_remove_rmap(struct page *page, bool compound)
+void page_remove_rmap(struct page *page,
+ struct vm_area_struct *vma, bool compound)
{
lock_page_memcg(page);
@@ -1408,9 +1398,6 @@ void page_remove_rmap(struct page *page, bool compound)
*/
__dec_lruvec_page_state(page, NR_ANON_MAPPED);
- if (unlikely(PageMlocked(page)))
- clear_page_mlock(page);
-
if (PageTransCompound(page))
deferred_split_huge_page(compound_head(page));
@@ -1425,20 +1412,18 @@ void page_remove_rmap(struct page *page, bool compound)
*/
out:
unlock_page_memcg(page);
+
+ munlock_vma_page(page, vma, compound);
}
/*
* @arg: enum ttu_flags will be passed to this argument
*/
-static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
+static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
struct mm_struct *mm = vma->vm_mm;
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = address,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, address, 0);
pte_t pteval;
struct page *subpage;
bool ret = true;
@@ -1455,21 +1440,20 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
pvmw.flags = PVMW_SYNC;
if (flags & TTU_SPLIT_HUGE_PMD)
- split_huge_pmd_address(vma, address, false, page);
+ split_huge_pmd_address(vma, address, false, folio);
/*
* For THP, we have to assume the worse case ie pmd for invalidation.
* For hugetlb, it could be much worse if we need to do pud
* invalidation in the case of pmd sharing.
*
- * Note that the page can not be free in this function as call of
- * try_to_unmap() must hold a reference on the page.
+ * Note that the folio can not be freed in this function as call of
+ * try_to_unmap() must hold a reference on the folio.
*/
- range.end = PageKsm(page) ?
- address + PAGE_SIZE : vma_address_end(page, vma);
+ range.end = vma_address_end(&pvmw);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
address, range.end);
- if (PageHuge(page)) {
+ if (folio_test_hugetlb(folio)) {
/*
* If sharing is possible, start and end will be adjusted
* accordingly.
@@ -1480,32 +1464,26 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
mmu_notifier_invalidate_range_start(&range);
while (page_vma_mapped_walk(&pvmw)) {
+ /* Unexpected PMD-mapped THP? */
+ VM_BUG_ON_FOLIO(!pvmw.pte, folio);
+
/*
- * If the page is mlock()d, we cannot swap it out.
+ * If the folio is in an mlock()d vma, we must not swap it out.
*/
if (!(flags & TTU_IGNORE_MLOCK) &&
(vma->vm_flags & VM_LOCKED)) {
- /*
- * PTE-mapped THP are never marked as mlocked: so do
- * not set it on a DoubleMap THP, nor on an Anon THP
- * (which may still be PTE-mapped after DoubleMap was
- * cleared). But stop unmapping even in those cases.
- */
- if (!PageTransCompound(page) || (PageHead(page) &&
- !PageDoubleMap(page) && !PageAnon(page)))
- mlock_vma_page(page);
+ /* Restore the mlock which got missed */
+ mlock_vma_folio(folio, vma, false);
page_vma_mapped_walk_done(&pvmw);
ret = false;
break;
}
- /* Unexpected PMD-mapped THP? */
- VM_BUG_ON_PAGE(!pvmw.pte, page);
-
- subpage = page - page_to_pfn(page) + pte_pfn(*pvmw.pte);
+ subpage = folio_page(folio,
+ pte_pfn(*pvmw.pte) - folio_pfn(folio));
address = pvmw.address;
- if (PageHuge(page) && !PageAnon(page)) {
+ if (folio_test_hugetlb(folio) && !folio_test_anon(folio)) {
/*
* To call huge_pmd_unshare, i_mmap_rwsem must be
* held in write mode. Caller needs to explicitly
@@ -1544,7 +1522,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
if (should_defer_flush(mm, flags)) {
/*
* We clear the PTE but do not flush so potentially
- * a remote CPU could still be writing to the page.
+ * a remote CPU could still be writing to the folio.
* If the entry was previously clean then the
* architecture must guarantee that a clear->dirty
* transition on a cached TLB entry is written through
@@ -1557,22 +1535,22 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
pteval = ptep_clear_flush(vma, address, pvmw.pte);
}
- /* Move the dirty bit to the page. Now the pte is gone. */
+ /* Set the dirty flag on the folio now the pte is gone. */
if (pte_dirty(pteval))
- set_page_dirty(page);
+ folio_mark_dirty(folio);
/* Update high watermark before we lower rss */
update_hiwater_rss(mm);
if (PageHWPoison(subpage) && !(flags & TTU_IGNORE_HWPOISON)) {
pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
- if (PageHuge(page)) {
- hugetlb_count_sub(compound_nr(page), mm);
+ if (folio_test_hugetlb(folio)) {
+ hugetlb_count_sub(folio_nr_pages(folio), mm);
set_huge_swap_pte_at(mm, address,
pvmw.pte, pteval,
vma_mmu_pagesize(vma));
} else {
- dec_mm_counter(mm, mm_counter(page));
+ dec_mm_counter(mm, mm_counter(&folio->page));
set_pte_at(mm, address, pvmw.pte, pteval);
}
@@ -1587,18 +1565,19 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
* migration) will not expect userfaults on already
* copied pages.
*/
- dec_mm_counter(mm, mm_counter(page));
+ dec_mm_counter(mm, mm_counter(&folio->page));
/* We have to invalidate as we cleared the pte */
mmu_notifier_invalidate_range(mm, address,
address + PAGE_SIZE);
- } else if (PageAnon(page)) {
+ } else if (folio_test_anon(folio)) {
swp_entry_t entry = { .val = page_private(subpage) };
pte_t swp_pte;
/*
* Store the swap location in the pte.
* See handle_pte_fault() ...
*/
- if (unlikely(PageSwapBacked(page) != PageSwapCache(page))) {
+ if (unlikely(folio_test_swapbacked(folio) !=
+ folio_test_swapcache(folio))) {
WARN_ON_ONCE(1);
ret = false;
/* We have to invalidate as we cleared the pte */
@@ -1609,8 +1588,8 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
}
/* MADV_FREE page check */
- if (!PageSwapBacked(page)) {
- if (!PageDirty(page)) {
+ if (!folio_test_swapbacked(folio)) {
+ if (!folio_test_dirty(folio)) {
/* Invalidate as we cleared the pte */
mmu_notifier_invalidate_range(mm,
address, address + PAGE_SIZE);
@@ -1619,11 +1598,11 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
}
/*
- * If the page was redirtied, it cannot be
+ * If the folio was redirtied, it cannot be
* discarded. Remap the page to page table.
*/
set_pte_at(mm, address, pvmw.pte, pteval);
- SetPageSwapBacked(page);
+ folio_set_swapbacked(folio);
ret = false;
page_vma_mapped_walk_done(&pvmw);
break;
@@ -1660,16 +1639,17 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
address + PAGE_SIZE);
} else {
/*
- * This is a locked file-backed page, thus it cannot
- * be removed from the page cache and replaced by a new
- * page before mmu_notifier_invalidate_range_end, so no
- * concurrent thread might update its page table to
- * point at new page while a device still is using this
- * page.
+ * This is a locked file-backed folio,
+ * so it cannot be removed from the page
+ * cache and replaced by a new folio before
+ * mmu_notifier_invalidate_range_end, so no
+ * concurrent thread might update its page table
+ * to point at a new folio while a device is
+ * still using this folio.
*
* See Documentation/vm/mmu_notifier.rst
*/
- dec_mm_counter(mm, mm_counter_file(page));
+ dec_mm_counter(mm, mm_counter_file(&folio->page));
}
discard:
/*
@@ -1679,8 +1659,10 @@ discard:
*
* See Documentation/vm/mmu_notifier.rst
*/
- page_remove_rmap(subpage, PageHuge(page));
- put_page(page);
+ page_remove_rmap(subpage, vma, folio_test_hugetlb(folio));
+ if (vma->vm_flags & VM_LOCKED)
+ mlock_page_drain(smp_processor_id());
+ folio_put(folio);
}
mmu_notifier_invalidate_range_end(&range);
@@ -1693,35 +1675,35 @@ static bool invalid_migration_vma(struct vm_area_struct *vma, void *arg)
return vma_is_temporary_stack(vma);
}
-static int page_not_mapped(struct page *page)
+static int page_not_mapped(struct folio *folio)
{
- return !page_mapped(page);
+ return !folio_mapped(folio);
}
/**
- * try_to_unmap - try to remove all page table mappings to a page
- * @page: the page to get unmapped
+ * try_to_unmap - Try to remove all page table mappings to a folio.
+ * @folio: The folio to unmap.
* @flags: action and flags
*
* Tries to remove all the page table entries which are mapping this
- * page, used in the pageout path. Caller must hold the page lock.
+ * folio. It is the caller's responsibility to check if the folio is
+ * still mapped if needed (use TTU_SYNC to prevent accounting races).
*
- * It is the caller's responsibility to check if the page is still
- * mapped when needed (use TTU_SYNC to prevent accounting races).
+ * Context: Caller must hold the folio lock.
*/
-void try_to_unmap(struct page *page, enum ttu_flags flags)
+void try_to_unmap(struct folio *folio, enum ttu_flags flags)
{
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
.arg = (void *)flags,
.done = page_not_mapped,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
};
if (flags & TTU_RMAP_LOCKED)
- rmap_walk_locked(page, &rwc);
+ rmap_walk_locked(folio, &rwc);
else
- rmap_walk(page, &rwc);
+ rmap_walk(folio, &rwc);
}
/*
@@ -1730,15 +1712,11 @@ void try_to_unmap(struct page *page, enum ttu_flags flags)
* If TTU_SPLIT_HUGE_PMD is specified any PMD mappings will be split into PTEs
* containing migration entries.
*/
-static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
+static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
unsigned long address, void *arg)
{
struct mm_struct *mm = vma->vm_mm;
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = address,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, address, 0);
pte_t pteval;
struct page *subpage;
bool ret = true;
@@ -1759,7 +1737,7 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
* TTU_SPLIT_HUGE_PMD and it wants to freeze.
*/
if (flags & TTU_SPLIT_HUGE_PMD)
- split_huge_pmd_address(vma, address, true, page);
+ split_huge_pmd_address(vma, address, true, folio);
/*
* For THP, we have to assume the worse case ie pmd for invalidation.
@@ -1769,11 +1747,10 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
* Note that the page can not be free in this function as call of
* try_to_unmap() must hold a reference on the page.
*/
- range.end = PageKsm(page) ?
- address + PAGE_SIZE : vma_address_end(page, vma);
+ range.end = vma_address_end(&pvmw);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
address, range.end);
- if (PageHuge(page)) {
+ if (folio_test_hugetlb(folio)) {
/*
* If sharing is possible, start and end will be adjusted
* accordingly.
@@ -1787,21 +1764,24 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
/* PMD-mapped THP migration entry */
if (!pvmw.pte) {
- VM_BUG_ON_PAGE(PageHuge(page) ||
- !PageTransCompound(page), page);
+ subpage = folio_page(folio,
+ pmd_pfn(*pvmw.pmd) - folio_pfn(folio));
+ VM_BUG_ON_FOLIO(folio_test_hugetlb(folio) ||
+ !folio_test_pmd_mappable(folio), folio);
- set_pmd_migration_entry(&pvmw, page);
+ set_pmd_migration_entry(&pvmw, subpage);
continue;
}
#endif
/* Unexpected PMD-mapped THP? */
- VM_BUG_ON_PAGE(!pvmw.pte, page);
+ VM_BUG_ON_FOLIO(!pvmw.pte, folio);
- subpage = page - page_to_pfn(page) + pte_pfn(*pvmw.pte);
+ subpage = folio_page(folio,
+ pte_pfn(*pvmw.pte) - folio_pfn(folio));
address = pvmw.address;
- if (PageHuge(page) && !PageAnon(page)) {
+ if (folio_test_hugetlb(folio) && !folio_test_anon(folio)) {
/*
* To call huge_pmd_unshare, i_mmap_rwsem must be
* held in write mode. Caller needs to explicitly
@@ -1839,15 +1819,15 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
flush_cache_page(vma, address, pte_pfn(*pvmw.pte));
pteval = ptep_clear_flush(vma, address, pvmw.pte);
- /* Move the dirty bit to the page. Now the pte is gone. */
+ /* Set the dirty flag on the folio now the pte is gone. */
if (pte_dirty(pteval))
- set_page_dirty(page);
+ folio_mark_dirty(folio);
/* Update high watermark before we lower rss */
update_hiwater_rss(mm);
- if (is_zone_device_page(page)) {
- unsigned long pfn = page_to_pfn(page);
+ if (folio_is_zone_device(folio)) {
+ unsigned long pfn = folio_pfn(folio);
swp_entry_t entry;
pte_t swp_pte;
@@ -1883,16 +1863,16 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
* changed when hugepage migrations to device private
* memory are supported.
*/
- subpage = page;
+ subpage = &folio->page;
} else if (PageHWPoison(subpage)) {
pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
- if (PageHuge(page)) {
- hugetlb_count_sub(compound_nr(page), mm);
+ if (folio_test_hugetlb(folio)) {
+ hugetlb_count_sub(folio_nr_pages(folio), mm);
set_huge_swap_pte_at(mm, address,
pvmw.pte, pteval,
vma_mmu_pagesize(vma));
} else {
- dec_mm_counter(mm, mm_counter(page));
+ dec_mm_counter(mm, mm_counter(&folio->page));
set_pte_at(mm, address, pvmw.pte, pteval);
}
@@ -1907,7 +1887,7 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
* migration) will not expect userfaults on already
* copied pages.
*/
- dec_mm_counter(mm, mm_counter(page));
+ dec_mm_counter(mm, mm_counter(&folio->page));
/* We have to invalidate as we cleared the pte */
mmu_notifier_invalidate_range(mm, address,
address + PAGE_SIZE);
@@ -1953,8 +1933,10 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
*
* See Documentation/vm/mmu_notifier.rst
*/
- page_remove_rmap(subpage, PageHuge(page));
- put_page(page);
+ page_remove_rmap(subpage, vma, folio_test_hugetlb(folio));
+ if (vma->vm_flags & VM_LOCKED)
+ mlock_page_drain(smp_processor_id());
+ folio_put(folio);
}
mmu_notifier_invalidate_range_end(&range);
@@ -1964,19 +1946,19 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma,
/**
* try_to_migrate - try to replace all page table mappings with swap entries
- * @page: the page to replace page table entries for
+ * @folio: the folio to replace page table entries for
* @flags: action and flags
*
- * Tries to remove all the page table entries which are mapping this page and
- * replace them with special swap entries. Caller must hold the page lock.
+ * Tries to remove all the page table entries which are mapping this folio and
+ * replace them with special swap entries. Caller must hold the folio lock.
*/
-void try_to_migrate(struct page *page, enum ttu_flags flags)
+void try_to_migrate(struct folio *folio, enum ttu_flags flags)
{
struct rmap_walk_control rwc = {
.rmap_one = try_to_migrate_one,
.arg = (void *)flags,
.done = page_not_mapped,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
};
/*
@@ -1987,7 +1969,7 @@ void try_to_migrate(struct page *page, enum ttu_flags flags)
TTU_SYNC)))
return;
- if (is_zone_device_page(page) && !is_device_private_page(page))
+ if (folio_is_zone_device(folio) && !folio_is_device_private(folio))
return;
/*
@@ -1998,83 +1980,13 @@ void try_to_migrate(struct page *page, enum ttu_flags flags)
* locking requirements of exec(), migration skips
* temporary VMAs until after exec() completes.
*/
- if (!PageKsm(page) && PageAnon(page))
+ if (!folio_test_ksm(folio) && folio_test_anon(folio))
rwc.invalid_vma = invalid_migration_vma;
if (flags & TTU_RMAP_LOCKED)
- rmap_walk_locked(page, &rwc);
+ rmap_walk_locked(folio, &rwc);
else
- rmap_walk(page, &rwc);
-}
-
-/*
- * Walks the vma's mapping a page and mlocks the page if any locked vma's are
- * found. Once one is found the page is locked and the scan can be terminated.
- */
-static bool page_mlock_one(struct page *page, struct vm_area_struct *vma,
- unsigned long address, void *unused)
-{
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = address,
- };
-
- /* An un-locked vma doesn't have any pages to lock, continue the scan */
- if (!(vma->vm_flags & VM_LOCKED))
- return true;
-
- while (page_vma_mapped_walk(&pvmw)) {
- /*
- * Need to recheck under the ptl to serialise with
- * __munlock_pagevec_fill() after VM_LOCKED is cleared in
- * munlock_vma_pages_range().
- */
- if (vma->vm_flags & VM_LOCKED) {
- /*
- * PTE-mapped THP are never marked as mlocked; but
- * this function is never called on a DoubleMap THP,
- * nor on an Anon THP (which may still be PTE-mapped
- * after DoubleMap was cleared).
- */
- mlock_vma_page(page);
- /*
- * No need to scan further once the page is marked
- * as mlocked.
- */
- page_vma_mapped_walk_done(&pvmw);
- return false;
- }
- }
-
- return true;
-}
-
-/**
- * page_mlock - try to mlock a page
- * @page: the page to be mlocked
- *
- * Called from munlock code. Checks all of the VMAs mapping the page and mlocks
- * the page if any are found. The page will be returned with PG_mlocked cleared
- * if it is not mapped by any locked vmas.
- */
-void page_mlock(struct page *page)
-{
- struct rmap_walk_control rwc = {
- .rmap_one = page_mlock_one,
- .done = page_not_mapped,
- .anon_lock = page_lock_anon_vma_read,
-
- };
-
- VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page);
- VM_BUG_ON_PAGE(PageCompound(page) && PageDoubleMap(page), page);
-
- /* Anon THP are only marked as mlocked when singly mapped */
- if (PageTransCompound(page) && PageAnon(page))
- return;
-
- rmap_walk(page, &rwc);
+ rmap_walk(folio, &rwc);
}
#ifdef CONFIG_DEVICE_PRIVATE
@@ -2085,15 +1997,11 @@ struct make_exclusive_args {
bool valid;
};
-static bool page_make_device_exclusive_one(struct page *page,
+static bool page_make_device_exclusive_one(struct folio *folio,
struct vm_area_struct *vma, unsigned long address, void *priv)
{
struct mm_struct *mm = vma->vm_mm;
- struct page_vma_mapped_walk pvmw = {
- .page = page,
- .vma = vma,
- .address = address,
- };
+ DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, address, 0);
struct make_exclusive_args *args = priv;
pte_t pteval;
struct page *subpage;
@@ -2104,12 +2012,13 @@ static bool page_make_device_exclusive_one(struct page *page,
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0, vma,
vma->vm_mm, address, min(vma->vm_end,
- address + page_size(page)), args->owner);
+ address + folio_size(folio)),
+ args->owner);
mmu_notifier_invalidate_range_start(&range);
while (page_vma_mapped_walk(&pvmw)) {
/* Unexpected PMD-mapped THP? */
- VM_BUG_ON_PAGE(!pvmw.pte, page);
+ VM_BUG_ON_FOLIO(!pvmw.pte, folio);
if (!pte_present(*pvmw.pte)) {
ret = false;
@@ -2117,16 +2026,17 @@ static bool page_make_device_exclusive_one(struct page *page,
break;
}
- subpage = page - page_to_pfn(page) + pte_pfn(*pvmw.pte);
+ subpage = folio_page(folio,
+ pte_pfn(*pvmw.pte) - folio_pfn(folio));
address = pvmw.address;
/* Nuke the page table entry. */
flush_cache_page(vma, address, pte_pfn(*pvmw.pte));
pteval = ptep_clear_flush(vma, address, pvmw.pte);
- /* Move the dirty bit to the page. Now the pte is gone. */
+ /* Set the dirty flag on the folio now the pte is gone. */
if (pte_dirty(pteval))
- set_page_dirty(page);
+ folio_mark_dirty(folio);
/*
* Check that our target page is still mapped at the expected
@@ -2159,7 +2069,7 @@ static bool page_make_device_exclusive_one(struct page *page,
* There is a reference on the page for the swap entry which has
* been removed, so shouldn't take another.
*/
- page_remove_rmap(subpage, false);
+ page_remove_rmap(subpage, vma, false);
}
mmu_notifier_invalidate_range_end(&range);
@@ -2168,21 +2078,22 @@ static bool page_make_device_exclusive_one(struct page *page,
}
/**
- * page_make_device_exclusive - mark the page exclusively owned by a device
- * @page: the page to replace page table entries for
- * @mm: the mm_struct where the page is expected to be mapped
- * @address: address where the page is expected to be mapped
+ * folio_make_device_exclusive - Mark the folio exclusively owned by a device.
+ * @folio: The folio to replace page table entries for.
+ * @mm: The mm_struct where the folio is expected to be mapped.
+ * @address: Address where the folio is expected to be mapped.
* @owner: passed to MMU_NOTIFY_EXCLUSIVE range notifier callbacks
*
- * Tries to remove all the page table entries which are mapping this page and
- * replace them with special device exclusive swap entries to grant a device
- * exclusive access to the page. Caller must hold the page lock.
+ * Tries to remove all the page table entries which are mapping this
+ * folio and replace them with special device exclusive swap entries to
+ * grant a device exclusive access to the folio.
*
- * Returns false if the page is still mapped, or if it could not be unmapped
+ * Context: Caller must hold the folio lock.
+ * Return: false if the page is still mapped, or if it could not be unmapped
* from the expected address. Otherwise returns true (success).
*/
-static bool page_make_device_exclusive(struct page *page, struct mm_struct *mm,
- unsigned long address, void *owner)
+static bool folio_make_device_exclusive(struct folio *folio,
+ struct mm_struct *mm, unsigned long address, void *owner)
{
struct make_exclusive_args args = {
.mm = mm,
@@ -2193,21 +2104,20 @@ static bool page_make_device_exclusive(struct page *page, struct mm_struct *mm,
struct rmap_walk_control rwc = {
.rmap_one = page_make_device_exclusive_one,
.done = page_not_mapped,
- .anon_lock = page_lock_anon_vma_read,
+ .anon_lock = folio_lock_anon_vma_read,
.arg = &args,
};
/*
- * Restrict to anonymous pages for now to avoid potential writeback
- * issues. Also tail pages shouldn't be passed to rmap_walk so skip
- * those.
+ * Restrict to anonymous folios for now to avoid potential writeback
+ * issues.
*/
- if (!PageAnon(page) || PageTail(page))
+ if (!folio_test_anon(folio))
return false;
- rmap_walk(page, &rwc);
+ rmap_walk(folio, &rwc);
- return args.valid && !page_mapcount(page);
+ return args.valid && !folio_mapcount(folio);
}
/**
@@ -2245,15 +2155,16 @@ int make_device_exclusive_range(struct mm_struct *mm, unsigned long start,
return npages;
for (i = 0; i < npages; i++, start += PAGE_SIZE) {
- if (!trylock_page(pages[i])) {
- put_page(pages[i]);
+ struct folio *folio = page_folio(pages[i]);
+ if (PageTail(pages[i]) || !folio_trylock(folio)) {
+ folio_put(folio);
pages[i] = NULL;
continue;
}
- if (!page_make_device_exclusive(pages[i], mm, start, owner)) {
- unlock_page(pages[i]);
- put_page(pages[i]);
+ if (!folio_make_device_exclusive(folio, mm, start, owner)) {
+ folio_unlock(folio);
+ folio_put(folio);
pages[i] = NULL;
}
}
@@ -2272,21 +2183,21 @@ void __put_anon_vma(struct anon_vma *anon_vma)
anon_vma_free(root);
}
-static struct anon_vma *rmap_walk_anon_lock(struct page *page,
- struct rmap_walk_control *rwc)
+static struct anon_vma *rmap_walk_anon_lock(struct folio *folio,
+ const struct rmap_walk_control *rwc)
{
struct anon_vma *anon_vma;
if (rwc->anon_lock)
- return rwc->anon_lock(page);
+ return rwc->anon_lock(folio);
/*
- * Note: remove_migration_ptes() cannot use page_lock_anon_vma_read()
+ * Note: remove_migration_ptes() cannot use folio_lock_anon_vma_read()
* because that depends on page_mapped(); but not all its usages
* are holding mmap_lock. Users without mmap_lock are required to
* take a reference count to prevent the anon_vma disappearing
*/
- anon_vma = page_anon_vma(page);
+ anon_vma = folio_anon_vma(folio);
if (!anon_vma)
return NULL;
@@ -2302,35 +2213,30 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page,
*
* Find all the mappings of a page using the mapping pointer and the vma chains
* contained in the anon_vma struct it points to.
- *
- * When called from page_mlock(), the mmap_lock of the mm containing the vma
- * where the page was found will be held for write. So, we won't recheck
- * vm_flags for that VMA. That should be OK, because that vma shouldn't be
- * LOCKED.
*/
-static void rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc,
- bool locked)
+static void rmap_walk_anon(struct folio *folio,
+ const struct rmap_walk_control *rwc, bool locked)
{
struct anon_vma *anon_vma;
pgoff_t pgoff_start, pgoff_end;
struct anon_vma_chain *avc;
if (locked) {
- anon_vma = page_anon_vma(page);
+ anon_vma = folio_anon_vma(folio);
/* anon_vma disappear under us? */
- VM_BUG_ON_PAGE(!anon_vma, page);
+ VM_BUG_ON_FOLIO(!anon_vma, folio);
} else {
- anon_vma = rmap_walk_anon_lock(page, rwc);
+ anon_vma = rmap_walk_anon_lock(folio, rwc);
}
if (!anon_vma)
return;
- pgoff_start = page_to_pgoff(page);
- pgoff_end = pgoff_start + thp_nr_pages(page) - 1;
+ pgoff_start = folio_pgoff(folio);
+ pgoff_end = pgoff_start + folio_nr_pages(folio) - 1;
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root,
pgoff_start, pgoff_end) {
struct vm_area_struct *vma = avc->vma;
- unsigned long address = vma_address(page, vma);
+ unsigned long address = vma_address(&folio->page, vma);
VM_BUG_ON_VMA(address == -EFAULT, vma);
cond_resched();
@@ -2338,9 +2244,9 @@ static void rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc,
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
continue;
- if (!rwc->rmap_one(page, vma, address, rwc->arg))
+ if (!rwc->rmap_one(folio, vma, address, rwc->arg))
break;
- if (rwc->done && rwc->done(page))
+ if (rwc->done && rwc->done(folio))
break;
}
@@ -2355,16 +2261,11 @@ static void rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc,
*
* Find all the mappings of a page using the mapping pointer and the vma chains
* contained in the address_space struct it points to.
- *
- * When called from page_mlock(), the mmap_lock of the mm containing the vma
- * where the page was found will be held for write. So, we won't recheck
- * vm_flags for that VMA. That should be OK, because that vma shouldn't be
- * LOCKED.
*/
-static void rmap_walk_file(struct page *page, struct rmap_walk_control *rwc,
- bool locked)
+static void rmap_walk_file(struct folio *folio,
+ const struct rmap_walk_control *rwc, bool locked)
{
- struct address_space *mapping = page_mapping(page);
+ struct address_space *mapping = folio_mapping(folio);
pgoff_t pgoff_start, pgoff_end;
struct vm_area_struct *vma;
@@ -2374,18 +2275,18 @@ static void rmap_walk_file(struct page *page, struct rmap_walk_control *rwc,
* structure at mapping cannot be freed and reused yet,
* so we can safely take mapping->i_mmap_rwsem.
*/
- VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
if (!mapping)
return;
- pgoff_start = page_to_pgoff(page);
- pgoff_end = pgoff_start + thp_nr_pages(page) - 1;
+ pgoff_start = folio_pgoff(folio);
+ pgoff_end = pgoff_start + folio_nr_pages(folio) - 1;
if (!locked)
i_mmap_lock_read(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap,
pgoff_start, pgoff_end) {
- unsigned long address = vma_address(page, vma);
+ unsigned long address = vma_address(&folio->page, vma);
VM_BUG_ON_VMA(address == -EFAULT, vma);
cond_resched();
@@ -2393,9 +2294,9 @@ static void rmap_walk_file(struct page *page, struct rmap_walk_control *rwc,
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
continue;
- if (!rwc->rmap_one(page, vma, address, rwc->arg))
+ if (!rwc->rmap_one(folio, vma, address, rwc->arg))
goto done;
- if (rwc->done && rwc->done(page))
+ if (rwc->done && rwc->done(folio))
goto done;
}
@@ -2404,25 +2305,25 @@ done:
i_mmap_unlock_read(mapping);
}
-void rmap_walk(struct page *page, struct rmap_walk_control *rwc)
+void rmap_walk(struct folio *folio, const struct rmap_walk_control *rwc)
{
- if (unlikely(PageKsm(page)))
- rmap_walk_ksm(page, rwc);
- else if (PageAnon(page))
- rmap_walk_anon(page, rwc, false);
+ if (unlikely(folio_test_ksm(folio)))
+ rmap_walk_ksm(folio, rwc);
+ else if (folio_test_anon(folio))
+ rmap_walk_anon(folio, rwc, false);
else
- rmap_walk_file(page, rwc, false);
+ rmap_walk_file(folio, rwc, false);
}
/* Like rmap_walk, but caller holds relevant rmap lock */
-void rmap_walk_locked(struct page *page, struct rmap_walk_control *rwc)
+void rmap_walk_locked(struct folio *folio, const struct rmap_walk_control *rwc)
{
/* no ksm support for now */
- VM_BUG_ON_PAGE(PageKsm(page), page);
- if (PageAnon(page))
- rmap_walk_anon(page, rwc, true);
+ VM_BUG_ON_FOLIO(folio_test_ksm(folio), folio);
+ if (folio_test_anon(folio))
+ rmap_walk_anon(folio, rwc, true);
else
- rmap_walk_file(page, rwc, true);
+ rmap_walk_file(folio, rwc, true);
}
#ifdef CONFIG_HUGETLB_PAGE
@@ -2450,8 +2351,7 @@ void hugepage_add_new_anon_rmap(struct page *page,
{
BUG_ON(address < vma->vm_start || address >= vma->vm_end);
atomic_set(compound_mapcount_ptr(page), 0);
- if (hpage_pincount_available(page))
- atomic_set(compound_pincount_ptr(page), 0);
+ atomic_set(compound_pincount_ptr(page), 0);
__page_set_anon_rmap(page, vma, address, 1);
}
diff --git a/mm/swap.c b/mm/swap.c
index 754520bab299..5b30045207e1 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -74,8 +74,8 @@ static DEFINE_PER_CPU(struct lru_pvecs, lru_pvecs) = {
};
/*
- * This path almost never happens for VM activity - pages are normally
- * freed via pagevecs. But it gets used by networking.
+ * This path almost never happens for VM activity - pages are normally freed
+ * via pagevecs. But it gets used by networking - and for compound pages.
*/
static void __page_cache_release(struct page *page)
{
@@ -89,6 +89,14 @@ static void __page_cache_release(struct page *page)
__clear_page_lru_flags(page);
unlock_page_lruvec_irqrestore(lruvec, flags);
}
+ /* See comment on PageMlocked in release_pages() */
+ if (unlikely(PageMlocked(page))) {
+ int nr_pages = thp_nr_pages(page);
+
+ __ClearPageMlocked(page);
+ mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
+ count_vm_events(UNEVICTABLE_PGCLEARED, nr_pages);
+ }
__ClearPageWaiters(page);
}
@@ -114,17 +122,9 @@ static void __put_compound_page(struct page *page)
void __put_page(struct page *page)
{
- if (is_zone_device_page(page)) {
- put_dev_pagemap(page->pgmap);
-
- /*
- * The page belongs to the device that created pgmap. Do
- * not return it to page allocator.
- */
- return;
- }
-
- if (unlikely(PageCompound(page)))
+ if (unlikely(is_zone_device_page(page)))
+ free_zone_device_page(page);
+ else if (unlikely(PageCompound(page)))
__put_compound_page(page);
else
__put_single_page(page);
@@ -482,22 +482,12 @@ EXPORT_SYMBOL(folio_add_lru);
void lru_cache_add_inactive_or_unevictable(struct page *page,
struct vm_area_struct *vma)
{
- bool unevictable;
-
VM_BUG_ON_PAGE(PageLRU(page), page);
- unevictable = (vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) == VM_LOCKED;
- if (unlikely(unevictable) && !TestSetPageMlocked(page)) {
- int nr_pages = thp_nr_pages(page);
- /*
- * We use the irq-unsafe __mod_zone_page_state because this
- * counter is not modified from interrupt context, and the pte
- * lock is held(spinlock), which implies preemption disabled.
- */
- __mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
- count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
- }
- lru_cache_add(page);
+ if (unlikely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) == VM_LOCKED))
+ mlock_new_page(page);
+ else
+ lru_cache_add(page);
}
/*
@@ -636,35 +626,37 @@ void lru_add_drain_cpu(int cpu)
pagevec_lru_move_fn(pvec, lru_lazyfree_fn);
activate_page_drain(cpu);
+ mlock_page_drain(cpu);
}
/**
- * deactivate_file_page - forcefully deactivate a file page
- * @page: page to deactivate
+ * deactivate_file_folio() - Forcefully deactivate a file folio.
+ * @folio: Folio to deactivate.
*
- * This function hints the VM that @page is a good reclaim candidate,
- * for example if its invalidation fails due to the page being dirty
+ * This function hints to the VM that @folio is a good reclaim candidate,
+ * for example if its invalidation fails due to the folio being dirty
* or under writeback.
+ *
+ * Context: Caller holds a reference on the page.
*/
-void deactivate_file_page(struct page *page)
+void deactivate_file_folio(struct folio *folio)
{
+ struct pagevec *pvec;
+
/*
- * In a workload with many unevictable page such as mprotect,
- * unevictable page deactivation for accelerating reclaim is pointless.
+ * In a workload with many unevictable pages such as mprotect,
+ * unevictable folio deactivation for accelerating reclaim is pointless.
*/
- if (PageUnevictable(page))
+ if (folio_test_unevictable(folio))
return;
- if (likely(get_page_unless_zero(page))) {
- struct pagevec *pvec;
-
- local_lock(&lru_pvecs.lock);
- pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
+ folio_get(folio);
+ local_lock(&lru_pvecs.lock);
+ pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
- if (pagevec_add_and_need_flush(pvec, page))
- pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
- local_unlock(&lru_pvecs.lock);
- }
+ if (pagevec_add_and_need_flush(pvec, &folio->page))
+ pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
+ local_unlock(&lru_pvecs.lock);
}
/*
@@ -837,6 +829,7 @@ inline void __lru_add_drain_all(bool force_all_cpus)
pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
need_activate_page_drain(cpu) ||
+ need_mlock_page_drain(cpu) ||
has_bh_in_lru(cpu, NULL)) {
INIT_WORK(work, lru_add_drain_per_cpu);
queue_work_on(cpu, mm_percpu_wq, work);
@@ -935,18 +928,10 @@ void release_pages(struct page **pages, int nr)
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL;
}
- /*
- * ZONE_DEVICE pages that return 'false' from
- * page_is_devmap_managed() do not require special
- * processing, and instead, expect a call to
- * put_page_testzero().
- */
- if (page_is_devmap_managed(page)) {
- put_devmap_managed_page(page);
+ if (put_devmap_managed_page(page))
continue;
- }
if (put_page_testzero(page))
- put_dev_pagemap(page->pgmap);
+ free_zone_device_page(page);
continue;
}
@@ -974,6 +959,18 @@ void release_pages(struct page **pages, int nr)
__clear_page_lru_flags(page);
}
+ /*
+ * In rare cases, when truncation or holepunching raced with
+ * munlock after VM_LOCKED was cleared, Mlocked may still be
+ * found set here. This does not indicate a problem, unless
+ * "unevictable_pgs_cleared" appears worryingly large.
+ */
+ if (unlikely(PageMlocked(page))) {
+ __ClearPageMlocked(page);
+ dec_zone_page_state(page, NR_MLOCK);
+ count_vm_event(UNEVICTABLE_PGCLEARED);
+ }
+
__ClearPageWaiters(page);
list_add(&page->lru, &pages_to_free);
@@ -1014,43 +1011,32 @@ static void __pagevec_lru_add_fn(struct folio *folio, struct lruvec *lruvec)
VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
+ folio_set_lru(folio);
/*
- * A folio becomes evictable in two ways:
- * 1) Within LRU lock [munlock_vma_page() and __munlock_pagevec()].
- * 2) Before acquiring LRU lock to put the folio on the correct LRU
- * and then
- * a) do PageLRU check with lock [check_move_unevictable_pages]
- * b) do PageLRU check before lock [clear_page_mlock]
- *
- * (1) & (2a) are ok as LRU lock will serialize them. For (2b), we need
- * following strict ordering:
- *
- * #0: __pagevec_lru_add_fn #1: clear_page_mlock
+ * Is an smp_mb__after_atomic() still required here, before
+ * folio_evictable() tests PageMlocked, to rule out the possibility
+ * of stranding an evictable folio on an unevictable LRU? I think
+ * not, because __munlock_page() only clears PageMlocked while the LRU
+ * lock is held.
*
- * folio_set_lru() folio_test_clear_mlocked()
- * smp_mb() // explicit ordering // above provides strict
- * // ordering
- * folio_test_mlocked() folio_test_lru()
- *
- *
- * if '#1' does not observe setting of PG_lru by '#0' and
- * fails isolation, the explicit barrier will make sure that
- * folio_evictable check will put the folio on the correct
- * LRU. Without smp_mb(), folio_set_lru() can be reordered
- * after folio_test_mlocked() check and can make '#1' fail the
- * isolation of the folio whose mlocked bit is cleared (#0 is
- * also looking at the same folio) and the evictable folio will
- * be stranded on an unevictable LRU.
+ * (That is not true of __page_cache_release(), and not necessarily
+ * true of release_pages(): but those only clear PageMlocked after
+ * put_page_testzero() has excluded any other users of the page.)
*/
- folio_set_lru(folio);
- smp_mb__after_atomic();
-
if (folio_evictable(folio)) {
if (was_unevictable)
__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
} else {
folio_clear_active(folio);
folio_set_unevictable(folio);
+ /*
+ * folio->mlock_count = !!folio_test_mlocked(folio)?
+ * But that leaves __mlock_page() in doubt whether another
+ * actor has already counted the mlock or not. Err on the
+ * safe side, underestimate, let page reclaim fix it, rather
+ * than leaving a page on the unevictable LRU indefinitely.
+ */
+ folio->mlock_count = 0;
if (!was_unevictable)
__count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
}
@@ -1158,26 +1144,3 @@ void __init swap_setup(void)
* _really_ don't want to cluster much more
*/
}
-
-#ifdef CONFIG_DEV_PAGEMAP_OPS
-void put_devmap_managed_page(struct page *page)
-{
- int count;
-
- if (WARN_ON_ONCE(!page_is_devmap_managed(page)))
- return;
-
- count = page_ref_dec_return(page);
-
- /*
- * devmap page refcounts are 1-based, rather than 0-based: if
- * refcount is 1, then the page is free and the refcount is
- * stable because nobody holds a reference on the page.
- */
- if (count == 1)
- free_devmap_managed_page(page);
- else if (!count)
- __put_page(page);
-}
-EXPORT_SYMBOL(put_devmap_managed_page);
-#endif
diff --git a/mm/truncate.c b/mm/truncate.c
index 9dbf0b75da5d..cace6e3e4e8c 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -193,27 +193,6 @@ static void truncate_cleanup_folio(struct folio *folio)
folio_clear_mappedtodisk(folio);
}
-/*
- * This is for invalidate_mapping_pages(). That function can be called at
- * any time, and is not supposed to throw away dirty pages. But pages can
- * be marked dirty at any time too, so use remove_mapping which safely
- * discards clean, unused pages.
- *
- * Returns non-zero if the page was successfully invalidated.
- */
-static int
-invalidate_complete_page(struct address_space *mapping, struct page *page)
-{
-
- if (page->mapping != mapping)
- return 0;
-
- if (page_has_private(page) && !try_to_release_page(page, 0))
- return 0;
-
- return remove_mapping(mapping, page);
-}
-
int truncate_inode_folio(struct address_space *mapping, struct folio *folio)
{
if (folio->mapping != mapping)
@@ -294,22 +273,40 @@ int generic_error_remove_page(struct address_space *mapping, struct page *page)
}
EXPORT_SYMBOL(generic_error_remove_page);
-/*
+static long mapping_evict_folio(struct address_space *mapping,
+ struct folio *folio)
+{
+ if (folio_test_dirty(folio) || folio_test_writeback(folio))
+ return 0;
+ /* The refcount will be elevated if any page in the folio is mapped */
+ if (folio_ref_count(folio) >
+ folio_nr_pages(folio) + folio_has_private(folio) + 1)
+ return 0;
+ if (folio_has_private(folio) && !filemap_release_folio(folio, 0))
+ return 0;
+
+ return remove_mapping(mapping, folio);
+}
+
+/**
+ * invalidate_inode_page() - Remove an unused page from the pagecache.
+ * @page: The page to remove.
+ *
* Safely invalidate one page from its pagecache mapping.
- * It only drops clean, unused pages. The page must be locked.
+ * It only drops clean, unused pages.
*
- * Returns 1 if the page is successfully invalidated, otherwise 0.
+ * Context: Page must be locked.
+ * Return: The number of pages successfully removed.
*/
-int invalidate_inode_page(struct page *page)
+long invalidate_inode_page(struct page *page)
{
- struct address_space *mapping = page_mapping(page);
+ struct folio *folio = page_folio(page);
+ struct address_space *mapping = folio_mapping(folio);
+
+ /* The page may have been truncated before it was locked */
if (!mapping)
return 0;
- if (PageDirty(page) || PageWriteback(page))
- return 0;
- if (page_mapped(page))
- return 0;
- return invalidate_complete_page(mapping, page);
+ return mapping_evict_folio(mapping, folio);
}
/**
@@ -497,7 +494,18 @@ void truncate_inode_pages_final(struct address_space *mapping)
}
EXPORT_SYMBOL(truncate_inode_pages_final);
-static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
+/**
+ * invalidate_mapping_pagevec - Invalidate all the unlocked pages of one inode
+ * @mapping: the address_space which holds the pages to invalidate
+ * @start: the offset 'from' which to invalidate
+ * @end: the offset 'to' which to invalidate (inclusive)
+ * @nr_pagevec: invalidate failed page number for caller
+ *
+ * This helper is similar to invalidate_mapping_pages(), except that it accounts
+ * for pages that are likely on a pagevec and counts them in @nr_pagevec, which
+ * will be used by the caller.
+ */
+unsigned long invalidate_mapping_pagevec(struct address_space *mapping,
pgoff_t start, pgoff_t end, unsigned long *nr_pagevec)
{
pgoff_t indices[PAGEVEC_SIZE];
@@ -510,27 +518,27 @@ static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
folio_batch_init(&fbatch);
while (find_lock_entries(mapping, index, end, &fbatch, indices)) {
for (i = 0; i < folio_batch_count(&fbatch); i++) {
- struct page *page = &fbatch.folios[i]->page;
+ struct folio *folio = fbatch.folios[i];
- /* We rely upon deletion not changing page->index */
+ /* We rely upon deletion not changing folio->index */
index = indices[i];
- if (xa_is_value(page)) {
+ if (xa_is_value(folio)) {
count += invalidate_exceptional_entry(mapping,
index,
- page);
+ folio);
continue;
}
- index += thp_nr_pages(page) - 1;
+ index += folio_nr_pages(folio) - 1;
- ret = invalidate_inode_page(page);
- unlock_page(page);
+ ret = mapping_evict_folio(mapping, folio);
+ folio_unlock(folio);
/*
- * Invalidation is a hint that the page is no longer
+ * Invalidation is a hint that the folio is no longer
* of interest and try to speed up its reclaim.
*/
if (!ret) {
- deactivate_file_page(page);
+ deactivate_file_folio(folio);
/* It is likely on the pagevec of a remote CPU */
if (nr_pagevec)
(*nr_pagevec)++;
@@ -562,29 +570,12 @@ static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
- return __invalidate_mapping_pages(mapping, start, end, NULL);
+ return invalidate_mapping_pagevec(mapping, start, end, NULL);
}
EXPORT_SYMBOL(invalidate_mapping_pages);
-/**
- * invalidate_mapping_pagevec - Invalidate all the unlocked pages of one inode
- * @mapping: the address_space which holds the pages to invalidate
- * @start: the offset 'from' which to invalidate
- * @end: the offset 'to' which to invalidate (inclusive)
- * @nr_pagevec: invalidate failed page number for caller
- *
- * This helper is similar to invalidate_mapping_pages(), except that it accounts
- * for pages that are likely on a pagevec and counts them in @nr_pagevec, which
- * will be used by the caller.
- */
-void invalidate_mapping_pagevec(struct address_space *mapping,
- pgoff_t start, pgoff_t end, unsigned long *nr_pagevec)
-{
- __invalidate_mapping_pages(mapping, start, end, nr_pagevec);
-}
-
/*
- * This is like invalidate_complete_page(), except it ignores the page's
+ * This is like invalidate_inode_page(), except it ignores the page's
* refcount. We do this because invalidate_inode_pages2() needs stronger
* invalidation guarantees, and cannot afford to leave pages behind because
* shrink_page_list() has a temp ref on them, or because they're transiently
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 6ccc534d1c1c..0cb8e5ef1713 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -95,10 +95,15 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
if (!pte_none(*dst_pte))
goto out_unlock;
- if (page_in_cache)
- page_add_file_rmap(page, false);
- else
+ if (page_in_cache) {
+ /* Usually, cache pages are already added to LRU */
+ if (newly_allocated)
+ lru_cache_add(page);
+ page_add_file_rmap(page, dst_vma, false);
+ } else {
page_add_new_anon_rmap(page, dst_vma, dst_addr, false);
+ lru_cache_add_inactive_or_unevictable(page, dst_vma);
+ }
/*
* Must happen after rmap, as mm_counter() checks mapping (via
@@ -106,9 +111,6 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
*/
inc_mm_counter(dst_mm, mm_counter(page));
- if (newly_allocated)
- lru_cache_add_inactive_or_unevictable(page, dst_vma);
-
set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
/* No need to invalidate - it was non-present before */
diff --git a/mm/util.c b/mm/util.c
index d3102081add0..1e2728736398 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -681,9 +681,8 @@ bool folio_mapped(struct folio *folio)
}
EXPORT_SYMBOL(folio_mapped);
-struct anon_vma *page_anon_vma(struct page *page)
+struct anon_vma *folio_anon_vma(struct folio *folio)
{
- struct folio *folio = page_folio(page);
unsigned long mapping = (unsigned long)folio->mapping;
if ((mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
@@ -743,6 +742,39 @@ int __page_mapcount(struct page *page)
EXPORT_SYMBOL_GPL(__page_mapcount);
/**
+ * folio_mapcount() - Calculate the number of mappings of this folio.
+ * @folio: The folio.
+ *
+ * A large folio tracks both how many times the entire folio is mapped,
+ * and how many times each individual page in the folio is mapped.
+ * This function calculates the total number of times the folio is
+ * mapped.
+ *
+ * Return: The number of times this folio is mapped.
+ */
+int folio_mapcount(struct folio *folio)
+{
+ int i, compound, nr, ret;
+
+ if (likely(!folio_test_large(folio)))
+ return atomic_read(&folio->_mapcount) + 1;
+
+ compound = folio_entire_mapcount(folio);
+ nr = folio_nr_pages(folio);
+ if (folio_test_hugetlb(folio))
+ return compound;
+ ret = compound;
+ for (i = 0; i < nr; i++)
+ ret += atomic_read(&folio_page(folio, i)->_mapcount) + 1;
+ /* File pages has compound_mapcount included in _mapcount */
+ if (!folio_test_anon(folio))
+ return ret - compound * nr;
+ if (folio_test_double_map(folio))
+ ret -= nr;
+ return ret;
+}
+
+/**
* folio_copy - Copy the contents of one folio to another.
* @dst: Folio to copy to.
* @src: Folio to copy from.
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 499fa86e754a..1678802e03e7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -979,36 +979,36 @@ void drop_slab(void)
drop_slab_node(nid);
}
-static inline int is_page_cache_freeable(struct page *page)
+static inline int is_page_cache_freeable(struct folio *folio)
{
/*
* A freeable page cache page is referenced only by the caller
* that isolated the page, the page cache and optional buffer
* heads at page->private.
*/
- int page_cache_pins = thp_nr_pages(page);
- return page_count(page) - page_has_private(page) == 1 + page_cache_pins;
+ return folio_ref_count(folio) - folio_test_private(folio) ==
+ 1 + folio_nr_pages(folio);
}
/*
- * We detected a synchronous write error writing a page out. Probably
+ * We detected a synchronous write error writing a folio out. Probably
* -ENOSPC. We need to propagate that into the address_space for a subsequent
* fsync(), msync() or close().
*
* The tricky part is that after writepage we cannot touch the mapping: nothing
- * prevents it from being freed up. But we have a ref on the page and once
- * that page is locked, the mapping is pinned.
+ * prevents it from being freed up. But we have a ref on the folio and once
+ * that folio is locked, the mapping is pinned.
*
- * We're allowed to run sleeping lock_page() here because we know the caller has
+ * We're allowed to run sleeping folio_lock() here because we know the caller has
* __GFP_FS.
*/
static void handle_write_error(struct address_space *mapping,
- struct page *page, int error)
+ struct folio *folio, int error)
{
- lock_page(page);
- if (page_mapping(page) == mapping)
+ folio_lock(folio);
+ if (folio_mapping(folio) == mapping)
mapping_set_error(mapping, error);
- unlock_page(page);
+ folio_unlock(folio);
}
static bool skip_throttle_noprogress(pg_data_t *pgdat)
@@ -1155,35 +1155,35 @@ typedef enum {
* pageout is called by shrink_page_list() for each dirty page.
* Calls ->writepage().
*/
-static pageout_t pageout(struct page *page, struct address_space *mapping)
+static pageout_t pageout(struct folio *folio, struct address_space *mapping)
{
/*
- * If the page is dirty, only perform writeback if that write
+ * If the folio is dirty, only perform writeback if that write
* will be non-blocking. To prevent this allocation from being
* stalled by pagecache activity. But note that there may be
* stalls if we need to run get_block(). We could test
* PagePrivate for that.
*
* If this process is currently in __generic_file_write_iter() against
- * this page's queue, we can perform writeback even if that
+ * this folio's queue, we can perform writeback even if that
* will block.
*
- * If the page is swapcache, write it back even if that would
+ * If the folio is swapcache, write it back even if that would
* block, for some throttling. This happens by accident, because
* swap_backing_dev_info is bust: it doesn't reflect the
* congestion state of the swapdevs. Easy to fix, if needed.
*/
- if (!is_page_cache_freeable(page))
+ if (!is_page_cache_freeable(folio))
return PAGE_KEEP;
if (!mapping) {
/*
- * Some data journaling orphaned pages can have
- * page->mapping == NULL while being dirty with clean buffers.
+ * Some data journaling orphaned folios can have
+ * folio->mapping == NULL while being dirty with clean buffers.
*/
- if (page_has_private(page)) {
- if (try_to_free_buffers(page)) {
- ClearPageDirty(page);
- pr_info("%s: orphaned page\n", __func__);
+ if (folio_test_private(folio)) {
+ if (try_to_free_buffers(&folio->page)) {
+ folio_clear_dirty(folio);
+ pr_info("%s: orphaned folio\n", __func__);
return PAGE_CLEAN;
}
}
@@ -1192,7 +1192,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
if (mapping->a_ops->writepage == NULL)
return PAGE_ACTIVATE;
- if (clear_page_dirty_for_io(page)) {
+ if (folio_clear_dirty_for_io(folio)) {
int res;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
@@ -1202,21 +1202,21 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
.for_reclaim = 1,
};
- SetPageReclaim(page);
- res = mapping->a_ops->writepage(page, &wbc);
+ folio_set_reclaim(folio);
+ res = mapping->a_ops->writepage(&folio->page, &wbc);
if (res < 0)
- handle_write_error(mapping, page, res);
+ handle_write_error(mapping, folio, res);
if (res == AOP_WRITEPAGE_ACTIVATE) {
- ClearPageReclaim(page);
+ folio_clear_reclaim(folio);
return PAGE_ACTIVATE;
}
- if (!PageWriteback(page)) {
+ if (!folio_test_writeback(folio)) {
/* synchronous write or broken a_ops? */
- ClearPageReclaim(page);
+ folio_clear_reclaim(folio);
}
- trace_mm_vmscan_writepage(page);
- inc_node_page_state(page, NR_VMSCAN_WRITE);
+ trace_mm_vmscan_write_folio(folio);
+ node_stat_add_folio(folio, NR_VMSCAN_WRITE);
return PAGE_SUCCESS;
}
@@ -1227,16 +1227,16 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
* Same as remove_mapping, but if the page is removed from the mapping, it
* gets returned with a refcount of 0.
*/
-static int __remove_mapping(struct address_space *mapping, struct page *page,
+static int __remove_mapping(struct address_space *mapping, struct folio *folio,
bool reclaimed, struct mem_cgroup *target_memcg)
{
int refcount;
void *shadow = NULL;
- BUG_ON(!PageLocked(page));
- BUG_ON(mapping != page_mapping(page));
+ BUG_ON(!folio_test_locked(folio));
+ BUG_ON(mapping != folio_mapping(folio));
- if (!PageSwapCache(page))
+ if (!folio_test_swapcache(folio))
spin_lock(&mapping->host->i_lock);
xa_lock_irq(&mapping->i_pages);
/*
@@ -1264,23 +1264,23 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
* Note that if SetPageDirty is always performed via set_page_dirty,
* and thus under the i_pages lock, then this ordering is not required.
*/
- refcount = 1 + compound_nr(page);
- if (!page_ref_freeze(page, refcount))
+ refcount = 1 + folio_nr_pages(folio);
+ if (!folio_ref_freeze(folio, refcount))
goto cannot_free;
/* note: atomic_cmpxchg in page_ref_freeze provides the smp_rmb */
- if (unlikely(PageDirty(page))) {
- page_ref_unfreeze(page, refcount);
+ if (unlikely(folio_test_dirty(folio))) {
+ folio_ref_unfreeze(folio, refcount);
goto cannot_free;
}
- if (PageSwapCache(page)) {
- swp_entry_t swap = { .val = page_private(page) };
- mem_cgroup_swapout(page, swap);
+ if (folio_test_swapcache(folio)) {
+ swp_entry_t swap = folio_swap_entry(folio);
+ mem_cgroup_swapout(folio, swap);
if (reclaimed && !mapping_exiting(mapping))
- shadow = workingset_eviction(page, target_memcg);
- __delete_from_swap_cache(page, swap, shadow);
+ shadow = workingset_eviction(folio, target_memcg);
+ __delete_from_swap_cache(&folio->page, swap, shadow);
xa_unlock_irq(&mapping->i_pages);
- put_swap_page(page, swap);
+ put_swap_page(&folio->page, swap);
} else {
void (*freepage)(struct page *);
@@ -1301,61 +1301,67 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
* exceptional entries and shadow exceptional entries in the
* same address_space.
*/
- if (reclaimed && page_is_file_lru(page) &&
+ if (reclaimed && folio_is_file_lru(folio) &&
!mapping_exiting(mapping) && !dax_mapping(mapping))
- shadow = workingset_eviction(page, target_memcg);
- __delete_from_page_cache(page, shadow);
+ shadow = workingset_eviction(folio, target_memcg);
+ __filemap_remove_folio(folio, shadow);
xa_unlock_irq(&mapping->i_pages);
if (mapping_shrinkable(mapping))
inode_add_lru(mapping->host);
spin_unlock(&mapping->host->i_lock);
if (freepage != NULL)
- freepage(page);
+ freepage(&folio->page);
}
return 1;
cannot_free:
xa_unlock_irq(&mapping->i_pages);
- if (!PageSwapCache(page))
+ if (!folio_test_swapcache(folio))
spin_unlock(&mapping->host->i_lock);
return 0;
}
-/*
- * Attempt to detach a locked page from its ->mapping. If it is dirty or if
- * someone else has a ref on the page, abort and return 0. If it was
- * successfully detached, return 1. Assumes the caller has a single ref on
- * this page.
+/**
+ * remove_mapping() - Attempt to remove a folio from its mapping.
+ * @mapping: The address space.
+ * @folio: The folio to remove.
+ *
+ * If the folio is dirty, under writeback or if someone else has a ref
+ * on it, removal will fail.
+ * Return: The number of pages removed from the mapping. 0 if the folio
+ * could not be removed.
+ * Context: The caller should have a single refcount on the folio and
+ * hold its lock.
*/
-int remove_mapping(struct address_space *mapping, struct page *page)
+long remove_mapping(struct address_space *mapping, struct folio *folio)
{
- if (__remove_mapping(mapping, page, false, NULL)) {
+ if (__remove_mapping(mapping, folio, false, NULL)) {
/*
- * Unfreezing the refcount with 1 rather than 2 effectively
+ * Unfreezing the refcount with 1 effectively
* drops the pagecache ref for us without requiring another
* atomic operation.
*/
- page_ref_unfreeze(page, 1);
- return 1;
+ folio_ref_unfreeze(folio, 1);
+ return folio_nr_pages(folio);
}
return 0;
}
/**
- * putback_lru_page - put previously isolated page onto appropriate LRU list
- * @page: page to be put back to appropriate lru list
+ * folio_putback_lru - Put previously isolated folio onto appropriate LRU list.
+ * @folio: Folio to be returned to an LRU list.
*
- * Add previously isolated @page to appropriate LRU list.
- * Page may still be unevictable for other reasons.
+ * Add previously isolated @folio to appropriate LRU list.
+ * The folio may still be unevictable for other reasons.
*
- * lru_lock must not be held, interrupts must be enabled.
+ * Context: lru_lock must not be held, interrupts must be enabled.
*/
-void putback_lru_page(struct page *page)
+void folio_putback_lru(struct folio *folio)
{
- lru_cache_add(page);
- put_page(page); /* drop ref from isolate */
+ folio_add_lru(folio);
+ folio_put(folio); /* drop ref from isolate */
}
enum page_references {
@@ -1365,61 +1371,61 @@ enum page_references {
PAGEREF_ACTIVATE,
};
-static enum page_references page_check_references(struct page *page,
+static enum page_references folio_check_references(struct folio *folio,
struct scan_control *sc)
{
- int referenced_ptes, referenced_page;
+ int referenced_ptes, referenced_folio;
unsigned long vm_flags;
- referenced_ptes = page_referenced(page, 1, sc->target_mem_cgroup,
- &vm_flags);
- referenced_page = TestClearPageReferenced(page);
+ referenced_ptes = folio_referenced(folio, 1, sc->target_mem_cgroup,
+ &vm_flags);
+ referenced_folio = folio_test_clear_referenced(folio);
/*
- * Mlock lost the isolation race with us. Let try_to_unmap()
- * move the page to the unevictable list.
+ * The supposedly reclaimable folio was found to be in a VM_LOCKED vma.
+ * Let the folio, now marked Mlocked, be moved to the unevictable list.
*/
if (vm_flags & VM_LOCKED)
- return PAGEREF_RECLAIM;
+ return PAGEREF_ACTIVATE;
if (referenced_ptes) {
/*
- * All mapped pages start out with page table
+ * All mapped folios start out with page table
* references from the instantiating fault, so we need
- * to look twice if a mapped file/anon page is used more
+ * to look twice if a mapped file/anon folio is used more
* than once.
*
* Mark it and spare it for another trip around the
* inactive list. Another page table reference will
* lead to its activation.
*
- * Note: the mark is set for activated pages as well
- * so that recently deactivated but used pages are
+ * Note: the mark is set for activated folios as well
+ * so that recently deactivated but used folios are
* quickly recovered.
*/
- SetPageReferenced(page);
+ folio_set_referenced(folio);
- if (referenced_page || referenced_ptes > 1)
+ if (referenced_folio || referenced_ptes > 1)
return PAGEREF_ACTIVATE;
/*
- * Activate file-backed executable pages after first usage.
+ * Activate file-backed executable folios after first usage.
*/
- if ((vm_flags & VM_EXEC) && !PageSwapBacked(page))
+ if ((vm_flags & VM_EXEC) && !folio_test_swapbacked(folio))
return PAGEREF_ACTIVATE;
return PAGEREF_KEEP;
}
- /* Reclaim if clean, defer dirty pages to writeback */
- if (referenced_page && !PageSwapBacked(page))
+ /* Reclaim if clean, defer dirty folios to writeback */
+ if (referenced_folio && !folio_test_swapbacked(folio))
return PAGEREF_RECLAIM_CLEAN;
return PAGEREF_RECLAIM;
}
/* Check if a page is dirty or under writeback */
-static void page_check_dirty_writeback(struct page *page,
+static void folio_check_dirty_writeback(struct folio *folio,
bool *dirty, bool *writeback)
{
struct address_space *mapping;
@@ -1428,24 +1434,24 @@ static void page_check_dirty_writeback(struct page *page,
* Anonymous pages are not handled by flushers and must be written
* from reclaim context. Do not stall reclaim based on them
*/
- if (!page_is_file_lru(page) ||
- (PageAnon(page) && !PageSwapBacked(page))) {
+ if (!folio_is_file_lru(folio) ||
+ (folio_test_anon(folio) && !folio_test_swapbacked(folio))) {
*dirty = false;
*writeback = false;
return;
}
- /* By default assume that the page flags are accurate */
- *dirty = PageDirty(page);
- *writeback = PageWriteback(page);
+ /* By default assume that the folio flags are accurate */
+ *dirty = folio_test_dirty(folio);
+ *writeback = folio_test_writeback(folio);
/* Verify dirty/writeback state if the filesystem supports it */
- if (!page_has_private(page))
+ if (!folio_test_private(folio))
return;
- mapping = page_mapping(page);
+ mapping = folio_mapping(folio);
if (mapping && mapping->a_ops->is_dirty_writeback)
- mapping->a_ops->is_dirty_writeback(page, dirty, writeback);
+ mapping->a_ops->is_dirty_writeback(&folio->page, dirty, writeback);
}
static struct page *alloc_demote_page(struct page *page, unsigned long node)
@@ -1519,14 +1525,16 @@ retry:
while (!list_empty(page_list)) {
struct address_space *mapping;
struct page *page;
+ struct folio *folio;
enum page_references references = PAGEREF_RECLAIM;
bool dirty, writeback, may_enter_fs;
unsigned int nr_pages;
cond_resched();
- page = lru_to_page(page_list);
- list_del(&page->lru);
+ folio = lru_to_folio(page_list);
+ list_del(&folio->lru);
+ page = &folio->page;
if (!trylock_page(page))
goto keep;
@@ -1552,12 +1560,12 @@ retry:
* reclaim_congested. kswapd will stall and start writing
* pages if the tail of the LRU is all dirty unqueued pages.
*/
- page_check_dirty_writeback(page, &dirty, &writeback);
+ folio_check_dirty_writeback(folio, &dirty, &writeback);
if (dirty || writeback)
- stat->nr_dirty++;
+ stat->nr_dirty += nr_pages;
if (dirty && !writeback)
- stat->nr_unqueued_dirty++;
+ stat->nr_unqueued_dirty += nr_pages;
/*
* Treat this page as congested if the underlying BDI is or if
@@ -1567,7 +1575,7 @@ retry:
*/
mapping = page_mapping(page);
if (writeback && PageReclaim(page))
- stat->nr_congested++;
+ stat->nr_congested += nr_pages;
/*
* If a page at the tail of the LRU is under writeback, there
@@ -1616,7 +1624,7 @@ retry:
if (current_is_kswapd() &&
PageReclaim(page) &&
test_bit(PGDAT_WRITEBACK, &pgdat->flags)) {
- stat->nr_immediate++;
+ stat->nr_immediate += nr_pages;
goto activate_locked;
/* Case 2 above */
@@ -1634,7 +1642,7 @@ retry:
* and it's also appropriate in global reclaim.
*/
SetPageReclaim(page);
- stat->nr_writeback++;
+ stat->nr_writeback += nr_pages;
goto activate_locked;
/* Case 3 above */
@@ -1648,7 +1656,7 @@ retry:
}
if (!ignore_references)
- references = page_check_references(page, sc);
+ references = folio_check_references(folio, sc);
switch (references) {
case PAGEREF_ACTIVATE:
@@ -1681,28 +1689,28 @@ retry:
if (!PageSwapCache(page)) {
if (!(sc->gfp_mask & __GFP_IO))
goto keep_locked;
- if (page_maybe_dma_pinned(page))
+ if (folio_maybe_dma_pinned(folio))
goto keep_locked;
if (PageTransHuge(page)) {
/* cannot split THP, skip it */
- if (!can_split_huge_page(page, NULL))
+ if (!can_split_folio(folio, NULL))
goto activate_locked;
/*
* Split pages without a PMD map right
* away. Chances are some or all of the
* tail pages can be freed without IO.
*/
- if (!compound_mapcount(page) &&
- split_huge_page_to_list(page,
- page_list))
+ if (!folio_entire_mapcount(folio) &&
+ split_folio_to_list(folio,
+ page_list))
goto activate_locked;
}
if (!add_to_swap(page)) {
if (!PageTransHuge(page))
goto activate_locked_split;
/* Fallback to swap normal pages */
- if (split_huge_page_to_list(page,
- page_list))
+ if (split_folio_to_list(folio,
+ page_list))
goto activate_locked;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
count_vm_event(THP_SWPOUT_FALLBACK);
@@ -1716,9 +1724,9 @@ retry:
/* Adding to swap updated mapping */
mapping = page_mapping(page);
}
- } else if (unlikely(PageTransHuge(page))) {
- /* Split file THP */
- if (split_huge_page_to_list(page, page_list))
+ } else if (PageSwapBacked(page) && PageTransHuge(page)) {
+ /* Split shmem THP */
+ if (split_folio_to_list(folio, page_list))
goto keep_locked;
}
@@ -1742,10 +1750,11 @@ retry:
enum ttu_flags flags = TTU_BATCH_FLUSH;
bool was_swapbacked = PageSwapBacked(page);
- if (unlikely(PageTransHuge(page)))
+ if (PageTransHuge(page) &&
+ thp_order(page) >= HPAGE_PMD_ORDER)
flags |= TTU_SPLIT_HUGE_PMD;
- try_to_unmap(page, flags);
+ try_to_unmap(folio, flags);
if (page_mapped(page)) {
stat->nr_unmap_fail += nr_pages;
if (!was_swapbacked && PageSwapBacked(page))
@@ -1793,13 +1802,13 @@ retry:
* starts and then write it out here.
*/
try_to_unmap_flush_dirty();
- switch (pageout(page, mapping)) {
+ switch (pageout(folio, mapping)) {
case PAGE_KEEP:
goto keep_locked;
case PAGE_ACTIVATE:
goto activate_locked;
case PAGE_SUCCESS:
- stat->nr_pageout += thp_nr_pages(page);
+ stat->nr_pageout += nr_pages;
if (PageWriteback(page))
goto keep;
@@ -1877,7 +1886,7 @@ retry:
*/
count_vm_event(PGLAZYFREED);
count_memcg_page_event(page, PGLAZYFREED);
- } else if (!mapping || !__remove_mapping(mapping, page, true,
+ } else if (!mapping || !__remove_mapping(mapping, folio, true,
sc->target_mem_cgroup))
goto keep_locked;
@@ -2132,45 +2141,40 @@ move:
}
/**
- * isolate_lru_page - tries to isolate a page from its LRU list
- * @page: page to isolate from its LRU list
+ * folio_isolate_lru() - Try to isolate a folio from its LRU list.
+ * @folio: Folio to isolate from its LRU list.
*
- * Isolates a @page from an LRU list, clears PageLRU and adjusts the
- * vmstat statistic corresponding to whatever LRU list the page was on.
+ * Isolate a @folio from an LRU list and adjust the vmstat statistic
+ * corresponding to whatever LRU list the folio was on.
*
- * Returns 0 if the page was removed from an LRU list.
- * Returns -EBUSY if the page was not on an LRU list.
- *
- * The returned page will have PageLRU() cleared. If it was found on
- * the active list, it will have PageActive set. If it was found on
- * the unevictable list, it will have the PageUnevictable bit set. That flag
+ * The folio will have its LRU flag cleared. If it was found on the
+ * active list, it will have the Active flag set. If it was found on the
+ * unevictable list, it will have the Unevictable flag set. These flags
* may need to be cleared by the caller before letting the page go.
*
- * The vmstat statistic corresponding to the list on which the page was
- * found will be decremented.
- *
- * Restrictions:
+ * Context:
*
* (1) Must be called with an elevated refcount on the page. This is a
- * fundamental difference from isolate_lru_pages (which is called
+ * fundamental difference from isolate_lru_pages() (which is called
* without a stable reference).
- * (2) the lru_lock must not be held.
- * (3) interrupts must be enabled.
+ * (2) The lru_lock must not be held.
+ * (3) Interrupts must be enabled.
+ *
+ * Return: 0 if the folio was removed from an LRU list.
+ * -EBUSY if the folio was not on an LRU list.
*/
-int isolate_lru_page(struct page *page)
+int folio_isolate_lru(struct folio *folio)
{
- struct folio *folio = page_folio(page);
int ret = -EBUSY;
- VM_BUG_ON_PAGE(!page_count(page), page);
- WARN_RATELIMIT(PageTail(page), "trying to isolate tail page");
+ VM_BUG_ON_FOLIO(!folio_ref_count(folio), folio);
- if (TestClearPageLRU(page)) {
+ if (folio_test_clear_lru(folio)) {
struct lruvec *lruvec;
- get_page(page);
+ folio_get(folio);
lruvec = folio_lruvec_lock_irq(folio);
- del_page_from_lru_list(page, lruvec);
+ lruvec_del_folio(lruvec, folio);
unlock_page_lruvec_irq(lruvec);
ret = 0;
}
@@ -2406,7 +2410,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
*
* If the pages are mostly unmapped, the processing is fast and it is
* appropriate to hold lru_lock across the whole operation. But if
- * the pages are mapped, the processing is slow (page_referenced()), so
+ * the pages are mapped, the processing is slow (folio_referenced()), so
* we should drop lru_lock around each page. It's impossible to balance
* this, so instead we remove the pages from the LRU while processing them.
* It is safe to rely on PG_active against the non-LRU pages in here because
@@ -2426,7 +2430,6 @@ static void shrink_active_list(unsigned long nr_to_scan,
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_active);
LIST_HEAD(l_inactive);
- struct page *page;
unsigned nr_deactivate, nr_activate;
unsigned nr_rotated = 0;
int file = is_file_lru(lru);
@@ -2448,9 +2451,13 @@ static void shrink_active_list(unsigned long nr_to_scan,
spin_unlock_irq(&lruvec->lru_lock);
while (!list_empty(&l_hold)) {
+ struct folio *folio;
+ struct page *page;
+
cond_resched();
- page = lru_to_page(&l_hold);
- list_del(&page->lru);
+ folio = lru_to_folio(&l_hold);
+ list_del(&folio->lru);
+ page = &folio->page;
if (unlikely(!page_evictable(page))) {
putback_lru_page(page);
@@ -2465,8 +2472,8 @@ static void shrink_active_list(unsigned long nr_to_scan,
}
}
- if (page_referenced(page, 0, sc->target_mem_cgroup,
- &vm_flags)) {
+ if (folio_referenced(folio, 0, sc->target_mem_cgroup,
+ &vm_flags)) {
/*
* Identify referenced, file-backed active pages and
* give them one more trip around the active list. So
diff --git a/mm/workingset.c b/mm/workingset.c
index 6f616a69eab6..8a3828acc0bf 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -245,31 +245,32 @@ void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages)
}
/**
- * workingset_eviction - note the eviction of a page from memory
+ * workingset_eviction - note the eviction of a folio from memory
* @target_memcg: the cgroup that is causing the reclaim
- * @page: the page being evicted
+ * @folio: the folio being evicted
*
- * Return: a shadow entry to be stored in @page->mapping->i_pages in place
- * of the evicted @page so that a later refault can be detected.
+ * Return: a shadow entry to be stored in @folio->mapping->i_pages in place
+ * of the evicted @folio so that a later refault can be detected.
*/
-void *workingset_eviction(struct page *page, struct mem_cgroup *target_memcg)
+void *workingset_eviction(struct folio *folio, struct mem_cgroup *target_memcg)
{
- struct pglist_data *pgdat = page_pgdat(page);
+ struct pglist_data *pgdat = folio_pgdat(folio);
unsigned long eviction;
struct lruvec *lruvec;
int memcgid;
- /* Page is fully exclusive and pins page's memory cgroup pointer */
- VM_BUG_ON_PAGE(PageLRU(page), page);
- VM_BUG_ON_PAGE(page_count(page), page);
- VM_BUG_ON_PAGE(!PageLocked(page), page);
+ /* Folio is fully exclusive and pins folio's memory cgroup pointer */
+ VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
+ VM_BUG_ON_FOLIO(folio_ref_count(folio), folio);
+ VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
lruvec = mem_cgroup_lruvec(target_memcg, pgdat);
/* XXX: target_memcg can be NULL, go through lruvec */
memcgid = mem_cgroup_id(lruvec_memcg(lruvec));
eviction = atomic_long_read(&lruvec->nonresident_age);
- workingset_age_nonresident(lruvec, thp_nr_pages(page));
- return pack_shadow(memcgid, pgdat, eviction, PageWorkingset(page));
+ workingset_age_nonresident(lruvec, folio_nr_pages(folio));
+ return pack_shadow(memcgid, pgdat, eviction,
+ folio_test_workingset(folio));
}
/**
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 19:04:50 +0000