From: Johannes Weiner <hannes@cmpxchg.org>
To: Suren Baghdasaryan <surenb@google.com>
Cc: tj@kernel.org, lizefan.x@bytedance.com, mingo@redhat.com,
peterz@infradead.org, shakeelb@google.com, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
minchan@kernel.org, corbet@lwn.net, bristot@redhat.com,
paulmck@kernel.org, rdunlap@infradead.org,
akpm@linux-foundation.org, tglx@linutronix.de, macro@orcam.me.uk,
viresh.kumar@linaro.org, mike.kravetz@oracle.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, kernel-team@android.com
Subject: Re: [PATCH v3 1/1] cgroup: make per-cgroup pressure stall tracking configurable
Date: Tue, 25 May 2021 09:00:30 -0400 [thread overview]
Message-ID: <YKz07nx3E8UEo1xa@cmpxchg.org> (raw)
In-Reply-To: <20210524195339.1233449-1-surenb@google.com>
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@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
next prev parent reply other threads:[~2021-05-25 13:00 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 [this message]
2021-06-08 16:25 ` Suren Baghdasaryan
2021-06-08 18:51 ` Johannes Weiner
2021-06-08 19:01 ` Tejun Heo
2021-06-08 19:01 ` Suren Baghdasaryan
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