linux-kernel - Re: [PATCH-cgroup v2] cgroup/cpuset: Include isolated cpuset CPUs in cpu_is

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Date:   Wed, 6 Dec 2023 09:38:19 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mrunal Patel <mpatel@...hat.com>,
        Ryan Phillips <rphillips@...hat.com>,
        Brent Rowsell <browsell@...hat.com>,
        Peter Hunt <pehunt@...hat.com>,
        Cestmir Kalina <ckalina@...hat.com>
Subject: Re: [PATCH-cgroup v2] cgroup/cpuset: Include isolated cpuset CPUs in
 cpu_is_isolated() check

On Tue, Dec 05, 2023 at 05:21:14PM -0500, Waiman Long wrote:
> Currently, the cpu_is_isolated() function checks only the statically
> isolated CPUs specified via the "isolcpus" and "nohz_full" kernel
> command line options. This function is used by vmstat and memcg to
> reduce interference with isolated CPUs by not doing stat flushing
> or scheduling works on those CPUs.
> 
> Workloads running on isolated CPUs within isolated cpuset
> partitions should receive the same treatment to reduce unnecessary
> interference. This patch introduces a new cpuset_cpu_is_isolated()
> function to be called by cpu_is_isolated() so that the set of dynamically
> created cpuset isolated CPUs will be included in the check.
> 
> Assuming that testing a bit in a cpumask is atomic, no synchronization
> primitive is currently used to synchronize access to the cpuset's
> isolated_cpus mask.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>

Applied to cgroup/for-6.8.

Thanks.

-- 
tejun