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mm: test PageSwapBacked in lumpy reclaim

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commit 043bcbe5ec upstream.

Stable note: Not tracked in Bugzilla. There were reports of shared
	mapped pages being unfairly reclaimed in comparison to older kernels.
	This is being addressed over time. Even though the subject
	refers to lumpy reclaim, it impacts compaction as well.

Lumpy reclaim does well to stop at a PageAnon when there's no swap, but
better is to stop at any PageSwapBacked, which includes shmem/tmpfs too.

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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>
Signed-off-by: Mel Gorman <mgorman@suse.de>
This commit is contained in:
Hugh Dickins
2012-01-10 15:08:33 -08:00
committed by Greg Kroah-Hartman
parent 503e973ce4
commit d2b02236b8
1 changed files with 1 additions and 1 deletions
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2
mm/vmscan.c
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@@ -1199,7 +1199,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
* anon page which don't already have a swap slot is
* pointless.
*/
if (nr_swap_pages <= 0 && PageAnon(cursor_page) &&
if (nr_swap_pages <= 0 && PageSwapBacked(cursor_page) &&
!PageSwapCache(cursor_page))
break;