Re: [PATCH v2 1/3] sched/numa: advanced per-cgroup numa statistic

Michal Koutný
2019-11-29T10:06:45Z

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On Fri, Nov 29, 2019 at 01:19:33PM +0800, 王贇 <yun.wang@linux.alibaba.com> wrote:
> I did some research regarding cpuacct, and find cpuacct_charge() is a good
> place to do hierarchical update, however, what we get there is the execution
> time delta since last update_curr().
I wouldn't extend cpuacct, I'd like to look into using the rstat
mechanism for per-CPU runtime collection. (Most certainly I won't get
down to this until mid December though.)

> I'm afraid we can't just do local/remote accumulation since the sample period
> now is changing, still have to accumulate the execution time into locality
> regions.
My idea was to decouple time from the locality counters completely. It'd
be up to the monitoring application to normalize differences wrt
sampling rate (and handle wrap arounds).

Michal

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