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Date:   Wed, 16 Dec 2020 09:30:07 -0500
From:   Tejun Heo <>
To:     Lai Jiangshan <>
        Lai Jiangshan <>,
        Hillf Danton <>,
        Valentin Schneider <>,
        Qian Cai <>,
        Peter Zijlstra <>,
        Vincent Donnefort <>
Subject: Re: [PATCH 00/10] workqueue: break affinity initiatively

On Mon, Dec 14, 2020 at 11:54:47PM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <>
> 06249738a41a ("workqueue: Manually break affinity on hotplug")
> said that scheduler will not force break affinity for us.
> But workqueue highly depends on the old behavior. Many parts of the codes
> relies on it, 06249738a41a ("workqueue: Manually break affinity on hotplug")
> is not enough to change it, and the commit has flaws in itself too.
> We need to thoroughly update the way workqueue handles affinity
> in cpu hot[un]plug, what is this patchset intends to do and
> replace the Valentin Schneider's patch [1].
> Patch 1 fixes a flaw reported by Hillf Danton <>.
> I have to include this fix because later patches depends on it.
> The patchset is based on tip/master rather than workqueue tree,
> because the patchset is a complement for 06249738a41a ("workqueue:
> Manually break affinity on hotplug") which is only in tip/master by now.
> [1]:

Generally looks good to me. Please feel free to add

 Acked-by: Tejun Heo <>

and route the series through tip.



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