mm/vmstat.c: erase latency in vmstat_shepherd
mainline inclusion from mainline-5.12-rc1 commit fbcc8183 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZW3B CVE: NA ------------------------------------------------- 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.comSigned-off-by: NJiang Biao <benbjiang@tencent.com> Reported-by: NBin Lai <robinlai@tencent.com> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NChengyang Fan <cy.fan@huawei.com> Reviewed-by: NChen Wandun <chenwandun@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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