linux-kernel - Re: [PATCH] kernel/hung_task: add option to ignore task

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Message-ID: <b1dd577d-b153-0cfd-6ab6-e7c973c0955e@quicinc.com>
Date:   Tue, 27 Sep 2022 10:04:37 +0800
From:   Kassey Li <quic_yingangl@...cinc.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     <mingo@...hat.com>, <linux-kernel@...r.kernel.org>,
        <quic_namajain@...cinc.com>
Subject: Re: [PATCH] kernel/hung_task: add option to ignore task



On 9/23/2022 7:04 PM, Peter Zijlstra wrote:
> On Fri, Sep 23, 2022 at 04:53:35PM +0800, Kassey Li wrote:
>> By default, hung_task will iterate the tasklist and check
>> state in TASK_UNINTERRUPTIBLE with a given timeout value.
>>
>> Some tasks may in this state as expected but reported by hung_task.
> 
> Please explain..
I want to set timout value as 60s, 20s, 10s,  or even 5s to more 
aggressive to detect my VIP tasks "init", "surfaceflinger", 
"system_server" for example as debug.

many other tasks wait for IO, mutex, delayed timer ...
will hit this while we want to ignore.