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authorMatthew Wilcox (Oracle)2022-06-17 18:49:59 +0100
committerakpm2022-07-03 18:08:45 -0700
commite3c4cebf3f9db8c9150eb1982da7e353d9938bed (patch)
treed61a632c2aad724283bb56eb173cc4d9b8707b04
parenta83f0551f49682c81444d682053d49f9dfcbe5fa (diff)
mm: add folios_put()
Patch series "Convert the swap code to be more folio-based". There's still more to do with the swap code, but this reaps a lot of the folio benefit. More than 4kB of kernel text saved (with the UEK7 kernel config). I don't know how much that's going to translate into CPU savings, but some of those compound_head() calls are on every page free, so it should be noticable. It might even be noticable just from an I-cache consumption perspective. This patch (of 22): This is just a wrapper around release_pages() for now. Place the prototype in mm.h along with folio_put() and folio_put_refs(). Link: https://lkml.kernel.org/r/20220617175020.717127-1-willy@infradead.org Link: https://lkml.kernel.org/r/20220617175020.717127-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--include/linux/mm.h19
-rw-r--r--include/linux/pagemap.h2
2 files changed, 19 insertions, 2 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 09ea26056e2f..09670ccb94e7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1220,6 +1220,25 @@ static inline void folio_put_refs(struct folio *folio, int refs)
__put_page(&folio->page);
}
+void release_pages(struct page **pages, int nr);
+
+/**
+ * folios_put - Decrement the reference count on an array of folios.
+ * @folios: The folios.
+ * @nr: How many folios there are.
+ *
+ * Like folio_put(), but for an array of folios. This is more efficient
+ * than writing the loop yourself as it will optimise the locks which
+ * need to be taken if the folios are freed.
+ *
+ * Context: May be called in process or interrupt context, but not in NMI
+ * context. May be called while holding a spinlock.
+ */
+static inline void folios_put(struct folio **folios, unsigned int nr)
+{
+ release_pages((struct page **)folios, nr);
+}
+
static inline void put_page(struct page *page)
{
struct folio *folio = page_folio(page);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index ce96866fbec4..c399a9c5da7d 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -345,8 +345,6 @@ static inline void filemap_nr_thps_dec(struct address_space *mapping)
#endif
}
-void release_pages(struct page **pages, int nr);
-
struct address_space *page_mapping(struct page *);
struct address_space *folio_mapping(struct folio *);
struct address_space *swapcache_mapping(struct folio *);