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>
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1 changed files with 6 additions and 3 deletions
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@ -321,9 +321,12 @@ static inline void mod_state(struct zone *zone,
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/*
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* The fetching of the stat_threshold is racy. We may apply
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* a counter threshold to the wrong the cpu if we get
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* rescheduled while executing here. However, the following
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* will apply the threshold again and therefore bring the
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* counter under the threshold.
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* rescheduled while executing here. However, the next
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* counter update will apply the threshold again and
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* therefore bring the counter under the threshold again.
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*
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* Most of the time the thresholds are the same anyways
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* for all cpus in a zone.
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*/
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t = this_cpu_read(pcp->stat_threshold);
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