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authorMel Gorman <mgorman@suse.de>2014-08-07 01:07:18 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-07 03:01:20 +0200
commitbb0b6dffa2ccfbd9747ad0cc87c7459622896e60 (patch)
tree43769dceca0502355d6853e90e62dae6769eea48 /mm/vmstat.c
parentmm: move zone->pages_scanned into a vmstat counter (diff)
downloadlinux-bb0b6dffa2ccfbd9747ad0cc87c7459622896e60.tar.xz
linux-bb0b6dffa2ccfbd9747ad0cc87c7459622896e60.zip
mm: vmscan: only update per-cpu thresholds for online CPU
When kswapd is awake reclaiming, the per-cpu stat thresholds are lowered to get more accurate counts to avoid breaching watermarks. This threshold update iterates over all possible CPUs which is unnecessary. Only online CPUs need to be updated. If a new CPU is onlined, refresh_zone_stat_thresholds() will set the thresholds correctly. Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--mm/vmstat.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c
index e574e883fa70..e9ab104b956f 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -200,7 +200,7 @@ void set_pgdat_percpu_threshold(pg_data_t *pgdat,
continue;
threshold = (*calculate_pressure)(zone);
- for_each_possible_cpu(cpu)
+ for_each_online_cpu(cpu)
per_cpu_ptr(zone->pageset, cpu)->stat_threshold
= threshold;
}