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: <e4b69082-bd23-4447-82f8-cb2a86c47690@redhat.com>
Date: Wed, 5 Mar 2025 22:10:10 -0500
From: Waiman Long <llong@...hat.com>
To: Waiman Long <llong@...hat.com>, Peter Zijlstra <peterz@...radead.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>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 1/2] hung_task: Show the blocker task if the task is
 hung on mutex

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?
>
Resend as plain text.

Regards,
Longman