From 33e037b9f75061e882e81106be10a2a4de42850d Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Tue, 10 Jan 2012 15:08:33 -0800 Subject: mm: test PageSwapBacked in lumpy reclaim commit 043bcbe5ec51e0478ef2b44acef17193e01d7f70 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 Reviewed-by: KOSAKI Motohiro Reviewed-by: Minchan Kim Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Mel Gorman Signed-off-by: Ben Hutchings --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/vmscan.c b/mm/vmscan.c index ba763be05b5b..b9eaa06c6e6e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1215,7 +1215,7 @@ 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; -- cgit v1.2.3