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

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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 <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2012-01-10 15:08:18 -08:00 • committed by Linus Torvalds
commit 86cfd3a450
1 changed files with 3 additions and 2 deletions
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5
mm/vmscan.c
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@ -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;