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vmstat: update comment regarding stat_threshold

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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 * The fetching of the stat_threshold is racy. We may apply
* a counter threshold to the wrong the cpu if we get * a counter threshold to the wrong the cpu if we get
* rescheduled while executing here. However, the following * rescheduled while executing here. However, the next
* will apply the threshold again and therefore bring the * counter update will apply the threshold again and
* counter under the threshold. * 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); t = this_cpu_read(pcp->stat_threshold);