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

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Message-ID: <YHryaegfV9jo6aiL@hirez.programming.kicks-ass.net>
Date:   Sat, 17 Apr 2021 16:36:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     zhouchuangao <zhouchuangao@...o.com>
Cc:     Ingo Molnar <mingo@...hat.com>, 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>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        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 Sat, Apr 17, 2021 at 07:13:01AM -0700, zhouchuangao wrote:
> eg:
> In Android system, we usually and some processes to the whitelist.
> static task_t task_whitelist[] = {
> 	{"mdrt_thread", HUNG_TASK_WHITELIST},
> 	{"chre_kthread", HUNG_TASK_WHITELIST},
> 	{"scp_power_reset", HUNG_TASK_WHITELIST},
> 	{"ccci_fsm1", HUNG_TASK_WHITELIST},
> 	{"qos_ipi_recv", HUNG_TASK_WHITELIST},
> 	{NULL, 0},
> };

What are these tasks doing that the hung-task detector fires on them?
Should you fix that instead?