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

[Kassey Li]

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.