linux-kernel - Re: [RFC] sched: add sched_show_task() variant that accepts log level

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Message-ID: <CAAFQd5DgDHLhQUv=Bw0Thd41Di740A_yv+7wxDErE_YpN4CqBQ@mail.gmail.com>
Date: Thu, 24 Apr 2025 13:34:15 +0900
From: Tomasz Figa <tfiga@...omium.org>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
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>, 
	Valentin Schneider <vschneid@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] sched: add sched_show_task() variant that accepts log level

On Wed, Mar 12, 2025 at 11:51 PM Tomasz Figa <tfiga@...omium.org> wrote:
>
> Hi Sergey,
>
> On Mon, Mar 10, 2025 at 5:25 PM Sergey Senozhatsky
> <senozhatsky@...omium.org> wrote:
> >
> > Hi,
> >
> > A request for comments, not a formal patch.
> >
> > Is there any reason why hung-task watchdog prints error header
> > with KERN_ERR log level while task's backtrace is printed with
> > KERN_INFO?  Will it make sense to unify log levels and introduce
> > sched_show_task() variant that accept log level param so that
> > everything that hung-task watchdog prints becomes KERN_ERR?
>
> Thanks a lot for looking into this.
>
> Let me just add that I've been looking into ways to automatically
> analyze kernel crash reports and I noticed that when I filter out
> KERN_INFO and higher log levels, I end up losing useful information
> for hung-task watchdog-kind of problems. This change would greatly
> help in filtering out unnecessary noise from the logs.
>
> By the way, if having it as KERN_INFO by default would still be
> desirable, I suppose we could add a KConfig option to set the desired
> log level?

Gentle ping on this patch.

Best regards,
Tomasz