linux-kernel - Re: [PATCH] kernel/hung_task: Add a whitelist and blacklist mechanism.

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Message-ID: <5571ac2e-0d13-8623-a66a-414b5cc36de5@i-love.sakura.ne.jp>
Date:   Mon, 19 Apr 2021 11:38:36 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     周传高 <zhouchuangao@...o.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Michal Hocko <mhocko@...e.com>,
        "Guilherme G. Piccoli" <gpiccoli@...onical.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/hung_task: Add a whitelist and blacklist
 mechanism.

On 2021/04/19 11:22, 周传高 wrote:
> Some SOC vendors' drivers or user-mode processes may be in D state for a long time,
> and normally they do not configure HUNG TASK, so we need to ignore these tasks if
> we use HUNG TASK. 

Isn't that a sign that the quality of the drivers and user-mode processes is poor?
Wait should be killable/interruptible if possible (for better response to e.g. OOM-killer).