linux-kernel - Re: [PATCH 1/3] cpuset: Don't always flush cpuset_migrate_mm_wq in cpuset_write

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Message-ID: <3jopfa5deuncuvfjltop7qu5dvdak37imdtmkjmnd5alg2zc2s@wiaztnxwgavz>
Date: Thu, 4 Sep 2025 16:30:32 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Chuyi Zhou <zhouchuyi@...edance.com>
Cc: tj@...nel.org, hannes@...xchg.org, longman@...hat.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] cpuset: Don't always flush cpuset_migrate_mm_wq in
 cpuset_write_resmask

On Thu, Sep 04, 2025 at 03:45:03PM +0800, Chuyi Zhou <zhouchuyi@...edance.com> wrote:
> It is unnecessary to always wait for the flush operation of
> cpuset_migrate_mm_wq to complete in cpuset_write_resmask, as modifying
> cpuset.cpus or cpuset.exclusive does not trigger mm migrations. The
> flush_workqueue can be executed only when cpuset.mems is modified.
> 
> Signed-off-by: Chuyi Zhou <zhouchuyi@...edance.com>
> ---
>  kernel/cgroup/cpuset.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reasonable and AFAICT correct optimization.

Reviewed-by: Michal Koutný <mkoutny@...e.com>

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