linux-kernel - Re: [PATCH V2] workqueue: watchdog: update wq_watchdog

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Date:   Sat, 20 Mar 2021 14:20:46 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Wang Qing <wangqing@...o.com>
Cc:     Lai Jiangshan <jiangshanlai@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Guilherme G. Piccoli" <gpiccoli@...onical.com>,
        Andrey Ignatov <rdna@...com>, Vlastimil Babka <vbabka@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Santosh Sivaraj <santosh@...six.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] workqueue: watchdog: update wq_watchdog_touched for
 unbound lockup checking

On Fri, Mar 19, 2021 at 04:00:36PM +0800, Wang Qing wrote:
> When touch_softlockup_watchdog() is called, only wq_watchdog_touched_cpu 
> updated, while the unbound worker_pool running on its core uses 
> wq_watchdog_touched to determine whether locked up. This may be mischecked.

Can you please elaborate here, preferably with a concrete scenario where the
new code is better?

Thanks.

-- 
tejun