diff options
| author |   Jiang Biao <benbjiang@tencent.com> | 2021-02-25 17:16:54 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-26 09:41:00 -0800 |
| commit | fbcc8183a4f815910697237386681153a05d9573 (patch) | |
| tree | 0608fed68d21c0f2206424db1fada188fd4a23f1 /mm/vmstat.c | |
| parent | mm: vmstat: add some comments on internal storage of byte items (diff) | |
| download | linux-dev-fbcc8183a4f815910697237386681153a05d9573.tar.xz linux-dev-fbcc8183a4f815910697237386681153a05d9573.zip | |
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>
Diffstat (limited to 'mm/vmstat.c')
| -rw-r--r-- | mm/vmstat.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index e60b36f5f0a9..74b2c374b86c 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -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(); |