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Commit 46dafbca authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
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Be more agressive about stealing when MIGRATE_RECLAIMABLE allocations fallback 



MIGRATE_RECLAIMABLE allocations tend to be very bursty in nature like when
updatedb starts.  It is likely this will occur in situations where MAX_ORDER
blocks of pages are not free.  This means that updatedb can scatter
MIGRATE_RECLAIMABLE pages throughout the address space.  This patch is more
agressive about stealing blocks of pages for MIGRATE_RECLAIMABLE.

Signed-off-by: default avatarMel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5adc5be7

mm/page_alloc.c

+15 −3
Original line number Original line Diff line number Diff line
@@ -821,11 +821,23 @@ retry: 




			/*

			/*

			 * If breaking a large block of pages, move all free

			 * If breaking a large block of pages, move all free

			 * pages to the preferred allocation list

			 * pages to the preferred allocation list. If falling

			 */

			 * back for a reclaimable kernel allocation, be more

			if (unlikely(current_order >= MAX_ORDER / 2)) {

			 * agressive about taking ownership of free pages

			 */

			if (unlikely(current_order >= MAX_ORDER / 2) ||

					start_migratetype == MIGRATE_RECLAIMABLE) {

				unsigned long pages;

				pages = move_freepages_block(zone, page,

								start_migratetype);



				/* Claim the whole block if over half of it is free */

				if ((pages << current_order) >= (1 << (MAX_ORDER-2)) &&

						migratetype != MIGRATE_HIGHATOMIC)

					set_pageblock_migratetype(page,

								start_migratetype);



				migratetype = start_migratetype;

				migratetype = start_migratetype;

				move_freepages_block(zone, page, migratetype);

			}

			}





			/* Remove the page from the freelists */

			/* Remove the page from the freelists */