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Message-ID: <YH01JvQErt6qfPac@hirez.programming.kicks-ass.net>
Date: Mon, 19 Apr 2021 09:45:42 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: 周传高 <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: Re: [PATCH] kernel/hung_task: Add a whitelist and blacklist
mechanism.
On Mon, Apr 19, 2021 at 09:46:26AM +0800, 周传高 wrote:
>
> >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?
>
> These tasks are implemented by the SoC vendor, and normally they do
> not configure HUNG TASK, so we need to ignore these tasks if we use
> HUNG TASK.
Then raise a bug against their crap software, don't try and work around
it in the kernel.
We're not going to upstream workarounds for crap vendor software.
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