linux-kernel - Question on workqueue: Manually break affinity on hotplug

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Message-ID: <BYAPR11MB2632FC41FF64133708F4537FFFA80@BYAPR11MB2632.namprd11.prod.outlook.com>
Date:   Thu, 14 Jan 2021 08:03:23 +0000
From:   "Zhang, Qiang" <Qiang.Zhang@...driver.com>
To:     "peterz@...radead.org" <peterz@...radead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Question on   workqueue: Manually break affinity on hotplug

Hello Peter

Excuse me, I have some questions for you, about a description of this change:

''Don't rely on the scheduler to force break affinity for us -- it will
stop doing that for per-cpu-kthreads."

this mean when cpuhotplug, scheduler do not  change  affinity for per-cpu-kthread's task, if we not active setting affinity?
but if per-cpu-kthread's task is not run state, when wake up,  will reset it's affinity, this  is done automatically.

or is it,  this place modified to fit the new one hotplug mechanism which
("sched/hotplug: Consolidate task migration on CPU unplug")?

Thanks
Qiang