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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
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