linux-kernel - Re: [PATCH v4 1/2] hung_task: Show the blocker task if the task is hung on mutex

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Message-Id: <20250313125530.47e75ba67df5198c7adefe7f@kernel.org>
Date: Thu, 13 Mar 2025 12:55:30 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Waiman Long <llong@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Boqun
 Feng <boqun.feng@...il.com>, Joel Granados <joel.granados@...nel.org>, Anna
 Schumaker <anna.schumaker@...cle.com>, Lance Yang <ioworker0@...il.com>,
 Kent Overstreet <kent.overstreet@...ux.dev>, Yongliang Gao
 <leonylgao@...cent.com>, Steven Rostedt <rostedt@...dmis.org>, Tomasz Figa
 <tfiga@...omium.org>, Sergey Senozhatsky <senozhatsky@...omium.org>,
 linux-kernel@...r.kernel.org, "Masami Hiramatsu (Google)"
 <mhiramat@...nel.org>
Subject: Re: [PATCH v4 1/2] hung_task: Show the blocker task if the task is
 hung on mutex

On Wed, 5 Mar 2025 22:10:10 -0500
Waiman Long <llong@...hat.com> wrote:

> On 3/5/25 10:07 PM, Waiman Long wrote:
> >
> >
> > On 3/5/25 9:32 PM, Masami Hiramatsu (Google) wrote:
> >>>> +config DETECT_HUNG_TASK_BLOCKER
> >>>> +	bool "Dump Hung Tasks Blocker"
> >>>> +	depends on DETECT_HUNG_TASK
> >>>> +	depends on !PREEMPT_RT
> >>>> +	default y
> >>>> +	help
> >>>> +	  Say Y here to show the blocker task's stacktrace who acquires
> >>>> +	  the mutex lock which "hung tasks" are waiting.
> >>>> +	  This will add overhead a bit but shows suspicious tasks and
> >>>> +	  call trace if it comes from waiting a mutex.
> >>>> +
> >>>>    config WQ_WATCHDOG
> >>>>    	bool "Detect Workqueue Stalls"
> >>>>    	depends on DEBUG_KERNEL
> >>>>
> >>> Reviewed-by: Waiman Long<longman@...hat.com>
> >>>
> >> Thanks Waiman! BTW, who will pick this patch?
> >> Andrew, could you pick this series?
> >
> > Peter, do you mind routing this patch via Andrew?

Gently ping.

Thank you,

> >
> Resend as plain text.
> 
> Regards,
> Longman
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>