Commit de2e7567 authored Sep 21, 2009 by Minchan Kim Committed by Linus Torvalds Sep 22, 2009

vmscan: don't attempt to reclaim anon page in lumpy reclaim when no swap space is available



The VM already avoids attempting to reclaim anon pages in various places,
But it doesn't avoid it for lumpy reclaim.

It shuffles lru list unnecessary so that it is pointless.

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent adea02a1

mm/vmscan.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -935,6 +935,16 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
		/* Check that we have not crossed a zone boundary. */
		if (unlikely(page_zone_id(cursor_page) != zone_id))
		continue;

		/*
		* If we don't have enough swap space, reclaiming of
		* anon page which don't already have a swap slot is
		* pointless.
		*/
		if (nr_swap_pages <= 0 && PageAnon(cursor_page) &&
		!PageSwapCache(cursor_page))
		continue;

		if (__isolate_lru_page(cursor_page, mode, file) == 0) {
		list_move(&cursor_page->lru, dst);
		mem_cgroup_del_lru(cursor_page);