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authorMel Gorman <mgorman@suse.de>2013-07-03 15:01:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:28 -0700
commitb7ea3c417b6c2e74ca1cb051568f60377908928d (patch)
tree2f1f5dccc02d1fc0ac4a7dd4d6bbe88757b7e675
parent283aba9f9e0e4882bf09bd37a2983379a6fae805 (diff)
mm: vmscan: check if kswapd should writepage once per pgdat scan
Currently kswapd checks if it should start writepage as it shrinks each zone without taking into consideration if the zone is balanced or not. This is not wrong as such but it does not make much sense either. This patch checks once per pgdat scan if kswapd should be writing pages. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Michal Hocko <mhocko@suse.cz> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Tested-by: Zlatko Calusic <zcalusic@bitsync.net> Cc: dormando <dormando@rydia.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/vmscan.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1109de0c35bf..a2d0c6842616 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2853,6 +2853,13 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
}
/*
+ * If we're getting trouble reclaiming, start doing writepage
+ * even in laptop mode.
+ */
+ if (sc.priority < DEF_PRIORITY - 2)
+ sc.may_writepage = 1;
+
+ /*
* Now scan the zone in the dma->highmem direction, stopping
* at the last zone which needs scanning.
*
@@ -2923,13 +2930,6 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
raise_priority = false;
}
- /*
- * If we're getting trouble reclaiming, start doing
- * writepage even in laptop mode.
- */
- if (sc.priority < DEF_PRIORITY - 2)
- sc.may_writepage = 1;
-
if (zone->all_unreclaimable) {
if (end_zone && end_zone == i)
end_zone--;