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authorMel Gorman <mgorman@suse.de>2012-10-08 16:29:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:21 +0900
commit1fb3f8ca0e9222535a39b884cb67a34628411b9f (patch)
tree5e72498f44d4fcae18f29eb87dd05a849a7a23c9 /mm/internal.h
parent83fde0f22872aa8c1d46f775cc7bdfa864499e65 (diff)
downloadlinux-1fb3f8ca0e9222535a39b884cb67a34628411b9f.tar.bz2
mm: compaction: capture a suitable high-order page immediately when it is made available
While compaction is migrating pages to free up large contiguous blocks for allocation it races with other allocation requests that may steal these blocks or break them up. This patch alters direct compaction to capture a suitable free page as soon as it becomes available to reduce this race. It uses similar logic to split_free_page() to ensure that watermarks are still obeyed. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Reviewed-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h
index b8c91b342e24..e549a7fbc296 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -131,6 +131,7 @@ struct compact_control {
int migratetype; /* MOVABLE, RECLAIMABLE etc */
struct zone *zone;
bool *contended; /* True if a lock was contended */
+ struct page **page; /* Page captured of requested size */
};
unsigned long