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vmstat: update comment regarding stat_threshold 

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2011-04-14 15:21:58 -07:00 committed by Linus Torvalds
parent 9f6ae448bf
commit d3bc236718
1 changed files with 6 additions and 3 deletions
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9
mm/vmstat.c
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@ -321,9 +321,12 @@ static inline void mod_state(struct zone *zone,
/*
* The fetching of the stat_threshold is racy. We may apply
* a counter threshold to the wrong the cpu if we get
* rescheduled while executing here. However, the following
* will apply the threshold again and therefore bring the
* counter under the threshold.
* rescheduled while executing here. However, the next
* counter update will apply the threshold again and
* therefore bring the counter under the threshold again.
*
* Most of the time the thresholds are the same anyways
* for all cpus in a zone.
*/
t = this_cpu_read(pcp->stat_threshold);