mm: test PageSwapBacked in lumpy reclaim
authorHugh Dickins <hughd@google.com>
Tue, 10 Jan 2012 23:08:33 +0000 (15:08 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 11 Jan 2012 00:30:46 +0000 (16:30 -0800)
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>
mm/vmscan.c

index b935e6f0d69518b71da8ccb42dffac2ac484d9f5..8a4e767fb8ac15e9a2be00aa908e22f57b3a4dc0 100644 (file)
@@ -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;