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

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commit 86cfd3a450 upstream.

Stable note: Not tracked in Bugzilla. This patch reduces kswapd CPU
	usage on swapless systems with high anonymous memory usage.

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>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Minchan Kim
2012-01-10 15:08:18 -08:00
committed by Greg Kroah-Hartman
parent 4391b5f49e
commit 503e973ce4
1 changed files with 3 additions and 2 deletions
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5
mm/vmscan.c
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@@ -2008,8 +2008,9 @@ 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;