From: Hugh Dickins <hughd@google.com>
Date: Tue, 10 Jan 2012 23:08:33 +0000 (-0800)
Subject: mm: test PageSwapBacked in lumpy reclaim
X-Git-Tag: upstream/snapshot3+hdmi~8381^2~79
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=043bcbe5ec51e0478ef2b44acef17193e01d7f70;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

mm: test PageSwapBacked in lumpy reclaim

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>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b935e6f..8a4e767 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1166,7 +1166,7 @@ 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;