linux-kernel - Re: [PATCH 0/3] Defer flushing of the cpuset_migrate_mm_wq to task

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Message-ID: <aLnL8RLdyRCPo-9P@slm.duckdns.org>
Date: Thu, 4 Sep 2025 07:27:13 -1000
From: Tejun Heo <tj@...nel.org>
To: Chuyi Zhou <zhouchuyi@...edance.com>
Cc: mkoutny@...e.com, hannes@...xchg.org, longman@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Defer flushing of the cpuset_migrate_mm_wq to
 task_work

On Thu, Sep 04, 2025 at 03:45:02PM +0800, Chuyi Zhou wrote:
> Now in cpuset_attach(), we need to synchronously wait for
> flush_workqueue to complete. The execution time of flushing
> cpuset_migrate_mm_wq depends on the amount of mm migration initiated by
> cpusets at that time. When the cpuset.mems of a cgroup occupying a large
> amount of memory is modified, it may trigger extensive mm migration,
> causing cpuset_attach() to block on flush_workqueue for an extended period.

Applied 1-3 to cgroup/for-6.18. There were a couple conflicts that I
resolved. It'd be great if you can take a look and make sure everything is
okay.

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-6.18

Thanks.

-- 
tejun