From 1fb3f8ca0e9222535a39b884cb67a34628411b9f Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Mon, 8 Oct 2012 16:29:12 -0700 Subject: 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 Reviewed-by: Rik van Riel Reviewed-by: Minchan Kim Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/internal.h | 1 + 1 file changed, 1 insertion(+) (limited to 'mm/internal.h') diff --git a/mm/internal.h b/mm/internal.h index b8c91b342e2..e549a7fbc29 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 -- cgit v1.2.3-18-g5258