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mm/vmstat.c: erase latency in vmstat_shepherd 

Many 100us+ latencies have been deteceted in vmstat_shepherd() on CPX
platform which has 208 logic cpus.  And vmstat_shepherd is queued every
second, which could make the case worse.

Add schedule point in vmstat_shepherd() to erase the latency.

Link: https://lkml.kernel.org/r/20210111035526.1511-1-benbjiang@tencent.com
Signed-off-by: Jiang Biao <benbjiang@tencent.com>
Reported-by: Bin Lai <robinlai@tencent.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
master
Jiang Biao 2021-02-25 17:16:54 -08:00 committed by Linus Torvalds
parent 629484ae73
commit fbcc8183a4
1 changed files with 2 additions and 0 deletions
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mm/vmstat.c
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@ -1980,6 +1980,8 @@ static void vmstat_shepherd(struct work_struct *w)
if (!delayed_work_pending(dw) && need_update(cpu))
queue_delayed_work_on(cpu, mm_percpu_wq, dw, 0);
cond_resched();
}
put_online_cpus();