Commit 86cfd3a4 authored Jan 10, 2012 by Minchan Kim Committed by Linus Torvalds Jan 10, 2012

mm/vmscan.c: consider swap space when deciding whether to continue reclaim



It's pointless to continue reclaiming when we have no swap space and lots
of anon pages in the inactive list.

Without this patch, it is possible when swap is disabled to continue
trying to reclaim when there are only anonymous pages in the system even
though that will not make any progress.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 799f933a

mm/vmscan.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -2000,8 +2000,9 @@ static inline bool should_continue_reclaim(struct zone *zone,
		* inactive lists are large enough, continue reclaiming
		*/
		pages_for_compaction = (2UL << sc->order);
		inactive_lru_pages = zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON) +
		zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
		inactive_lru_pages = zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
		if (nr_swap_pages > 0)
		inactive_lru_pages += zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
		if (sc->nr_reclaimed < pages_for_compaction &&
		inactive_lru_pages > pages_for_compaction)
		return true;

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