linux-kernel - Question about cpuset_hotplug_workfn in kernel/cgoup/cpuset.c

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Message-ID: <CAKns5cVnF6r5074Sq4y0-CXhpkBPXv+Uy8f18ku9d0UOE9iHmw@mail.gmail.com>
Date:   Fri, 2 Sep 2022 10:46:47 +0800
From:   Rick Yiu <rickyiu@...gle.com>
To:     linux-kernel@...r.kernel.org
Subject: Question about cpuset_hotplug_workfn in kernel/cgoup/cpuset.c

Hi all,

In the commit

deb7aa308ea26 cpuset: reorganize CPU / memory hotplug handling

It states so in the comment for this function:

/*
...
 * Note that CPU offlining during suspend is ignored.  We don't modify
 * cpusets across suspend/resume cycles at all.
 */

However, I did see the function cpuset_hotplug_workfn called in the resume
path, which costs 10+ ms on our platform. I was wondering if the statement
is still true, could this function be bypassed in the resume path?

I also filed a bug for this.
https://bugzilla.kernel.org/show_bug.cgi?id=216321

I wish to be personally CC'ed.

Thanks,
Rick