linux-kernel - Re: [PATCH 1/1] io_uring/sqpoll: inherit cpumask of creating process

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Message-Id: <172563087777.168448.6960752734044926743.b4-ty@kernel.dk>
Date: Fri, 06 Sep 2024 07:54:37 -0600
From: Jens Axboe <axboe@...nel.dk>
To: asml.silence@...il.com, Felix Moessbauer <felix.moessbauer@...mens.com>
Cc: linux-kernel@...r.kernel.org, io-uring@...r.kernel.org, 
 cgroups@...r.kernel.org, dqminh@...udflare.com, longman@...hat.com, 
 adriaan.schmidt@...mens.com, florian.bezdeka@...mens.com, 
 stable@...r.kernel.org
Subject: Re: [PATCH 1/1] io_uring/sqpoll: inherit cpumask of creating
 process


On Fri, 06 Sep 2024 15:44:33 +0200, Felix Moessbauer wrote:
> The submit queue polling threads are "kernel" threads that are started
> from the userland. In case the userland task is part of a cgroup with
> the cpuset controller enabled, the poller should also stay within that
> cpuset. This also holds, as the poller belongs to the same cgroup as
> the task that started it.
> 
> With the current implementation, a process can "break out" of the
> defined cpuset by creating sq pollers consuming CPU time on other CPUs,
> which is especially problematic for realtime applications.
> 
> [...]

Applied, thanks!

[1/1] io_uring/sqpoll: inherit cpumask of creating process
      commit: d369fdf0908a8a026a8a4b8729d2a193b75fd2d6

Best regards,
-- 
Jens Axboe