From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Suren Baghdasaryan <surenb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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Subject: Re: [PATCH v3 1/1] cgroup: make per-cgroup pressure stall tracking configurable
Date: Tue, 8 Jun 2021 15:01:05 -0400 [thread overview]
Message-ID: <YL++cWuetMvfx9Tf@slm.duckdns.org> (raw)
In-Reply-To: <20210524195339.1233449-1-surenb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
On Mon, May 24, 2021 at 12:53:39PM -0700, Suren Baghdasaryan wrote:
> PSI accounts stalls for each cgroup separately and aggregates it at each
> level of the hierarchy. This causes additional overhead with psi_avgs_work
> being called for each cgroup in the hierarchy. psi_avgs_work has been
> highly optimized, however on systems with large number of cgroups the
> overhead becomes noticeable.
> Systems which use PSI only at the system level could avoid this overhead
> if PSI can be configured to skip per-cgroup stall accounting.
> Add "cgroup_disable=pressure" kernel command-line option to allow
> requesting system-wide only pressure stall accounting. When set, it
> keeps system-wide accounting under /proc/pressure/ but skips accounting
> for individual cgroups and does not expose PSI nodes in cgroup hierarchy.
>
> Signed-off-by: Suren Baghdasaryan <surenb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Applied to cgroup/for-5.14.
Thanks.
--
tejun
next prev parent reply other threads:[~2021-06-08 19:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-24 19:53 [PATCH v3 1/1] cgroup: make per-cgroup pressure stall tracking configurable Suren Baghdasaryan
2021-05-24 20:00 ` Suren Baghdasaryan
2021-05-25 7:12 ` Peter Zijlstra
2021-05-25 13:00 ` Johannes Weiner
[not found] ` <YKz07nx3E8UEo1xa-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
2021-06-08 16:25 ` Suren Baghdasaryan
[not found] ` <CAJuCfpE2U3LAZP_42b7XV7rfQTdJWbTVw43TDcxGM95oW03upQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2021-06-08 18:51 ` Johannes Weiner
[not found] ` <20210524195339.1233449-1-surenb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2021-06-08 19:01 ` Tejun Heo [this message]
[not found] ` <YL++cWuetMvfx9Tf-NiLfg/pYEd1N0TnZuCh8vA@public.gmane.org>
2021-06-08 19:01 ` Suren Baghdasaryan
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