From: Minchan Kim <[email protected]>
commit 86cfd3a45042ab242d47f3935a02811a402beab6 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 <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: KOSAKI Motohiro <[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]>
Signed-off-by: Mel Gorman <[email protected]>
---
mm/vmscan.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8b98a75..da195c2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -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;
--
1.7.9.2
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