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

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Message-ID: <YAAK1MOPAPjrbSIt@hirez.programming.kicks-ass.net>
Date:   Thu, 14 Jan 2021 10:11:48 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Zhang, Qiang" <Qiang.Zhang@...driver.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Question on   workqueue: Manually break affinity on hotplug

On Thu, Jan 14, 2021 at 08:03:23AM +0000, Zhang, Qiang wrote:
> 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")?

https://lkml.kernel.org/r/20201214155457.3430-1-jiangshanlai@gmail.com
https://lkml.kernel.org/r/20201218170919.2950-1-jiangshanlai@gmail.com
https://lkml.kernel.org/r/20201226025117.2770-1-jiangshanlai@gmail.com
https://lkml.kernel.org/r/20210111152638.2417-1-jiangshanlai@gmail.com
https://lkml.kernel.org/r/20210112144344.850850975@infradead.org