linux-kernel - Re: [PATCH 07/10] workqueue: Manually break affinity on hotplug for unbound pool

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Message-ID: <X9oerhmw7/qWWczn@mtj.duckdns.org>
Date:   Wed, 16 Dec 2020 09:50:22 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH 07/10] workqueue: Manually break affinity on hotplug for
 unbound pool

On Mon, Dec 14, 2020 at 11:54:54PM +0800, Lai Jiangshan wrote:
>   * An unbound pool may end up with a cpumask which doesn't have any online
> - * CPUs.  When a worker of such pool get scheduled, the scheduler resets
> - * its cpus_allowed.  If @cpu is in @pool's cpumask which didn't have any
> - * online CPU before, cpus_allowed of all its workers should be restored.
> + * CPUs.  We have to reset workers' cpus_allowed of such pool.  And we
> + * restore the workers' cpus_allowed when the pool's cpumask has online
> + * CPU at the first time after reset.
          ^
          for the first time

-- 
tejun