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authorJoonsoo Kim2020-06-03 15:59:01 -0700
committerLinus Torvalds2020-06-03 20:09:44 -0700
commit97a225e69a1f880886f33d2e65a7ace13f152caa (patch)
tree5827c459fb9543eeb1ffec6b40edabf5f09e80ab /mm/internal.h
parent3334a45eb9e2bb040c880ef65e1d72357a0a008b (diff)
mm/page_alloc: integrate classzone_idx and high_zoneidx
classzone_idx is just different name for high_zoneidx now. So, integrate them and add some comment to struct alloc_context in order to reduce future confusion about the meaning of this variable. The accessor, ac_classzone_idx() is also removed since it isn't needed after integration. In addition to integration, this patch also renames high_zoneidx to highest_zoneidx since it represents more precise meaning. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Baoquan He <bhe@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: David Rientjes <rientjes@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Ye Xiaolong <xiaolong.ye@intel.com> Link: http://lkml.kernel.org/r/1587095923-7515-3-git-send-email-iamjoonsoo.kim@lge.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h21
1 files changed, 15 insertions, 6 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 6220a5e6b3c7..b1f0afcbe016 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -127,10 +127,10 @@ extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
* between functions involved in allocations, including the alloc_pages*
* family of functions.
*
- * nodemask, migratetype and high_zoneidx are initialized only once in
+ * nodemask, migratetype and highest_zoneidx are initialized only once in
* __alloc_pages_nodemask() and then never change.
*
- * zonelist, preferred_zone and classzone_idx are set first in
+ * zonelist, preferred_zone and highest_zoneidx are set first in
* __alloc_pages_nodemask() for the fast path, and might be later changed
* in __alloc_pages_slowpath(). All other functions pass the whole strucure
* by a const pointer.
@@ -140,12 +140,21 @@ struct alloc_context {
nodemask_t *nodemask;
struct zoneref *preferred_zoneref;
int migratetype;
- enum zone_type high_zoneidx;
+
+ /*
+ * highest_zoneidx represents highest usable zone index of
+ * the allocation request. Due to the nature of the zone,
+ * memory on lower zone than the highest_zoneidx will be
+ * protected by lowmem_reserve[highest_zoneidx].
+ *
+ * highest_zoneidx is also used by reclaim/compaction to limit
+ * the target zone since higher zone than this index cannot be
+ * usable for this allocation request.
+ */
+ enum zone_type highest_zoneidx;
bool spread_dirty_pages;
};
-#define ac_classzone_idx(ac) (ac->high_zoneidx)
-
/*
* Locate the struct page for both the matching buddy in our
* pair (buddy1) and the combined O(n+1) page they form (page).
@@ -224,7 +233,7 @@ struct compact_control {
int order; /* order a direct compactor needs */
int migratetype; /* migratetype of direct compactor */
const unsigned int alloc_flags; /* alloc flags of a direct compactor */
- const int classzone_idx; /* zone index of a direct compactor */
+ const int highest_zoneidx; /* zone index of a direct compactor */
enum migrate_mode mode; /* Async or sync migration mode */
bool ignore_skip_hint; /* Scan blocks even if marked skip */
bool no_set_skip_hint; /* Don't mark blocks for skipping */