linux-kernel - Re: [PATCH 3/5] cgroup/cpuset: Find another usable CPU if none found in current cpuset

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Message-ID: <20230324181936.5sf6xjc5a4vacuku@blackpad>
Date:   Fri, 24 Mar 2023 19:19:36 +0100
From:   Michal Koutný <mkoutny@...e.com>
To:     Will Deacon <will@...nel.org>
Cc:     Waiman Long <longman@...hat.com>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 3/5] cgroup/cpuset: Find another usable CPU if none found
 in current cpuset

On Fri, Mar 24, 2023 at 02:32:50PM +0000, Will Deacon <will@...nel.org> wrote:
> So approaches such as killing tasks or rejecting system calls tend not
> to work as well, since you inevitably get divergent behaviour leading
> to functional breakage rather than e.g. performance anomalies.

What about temporary performance drop from 100% to 0% aka freezing the
tasks for the duration of the mismatching affinity config?


> Having said that, the behaviour we currently have in mainline seems to
> be alright, so please don't go out of your way to accomodate these SoCs.

I see. (Just wondering what you think about the fourth option above.)

Thanks,
Michal

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