tree 43769dceca0502355d6853e90e62dae6769eea48
parent 0d5d823ab4e608ec7b52ac4410de4cb74bbe0edd
author Mel Gorman <mgorman@suse.de> 1407366438 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1407373280 -0700

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>