linux-kernel - Re: [PATCH v3 1/2] hung_task: Show the blocker task if the task is hung on mutex

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Message-ID: <20250224095151.73e809f8@gandalf.local.home>
Date: Mon, 24 Feb 2025 09:51:51 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Waiman Long <llong@...hat.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Peter Zijlstra
 <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Will Deacon
 <will@...nel.org>, Andrew Morton <akpm@...ux-foundation.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>, Tomasz Figa <tfiga@...omium.org>, Sergey
 Senozhatsky <senozhatsky@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] hung_task: Show the blocker task if the task is
 hung on mutex

On Sun, 23 Feb 2025 14:53:28 -0500
Waiman Long <llong@...hat.com> wrote:

> >>   +
> >> +#ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER
> >> +static void debug_show_blocker(struct task_struct *task)  
> 
> I think the easiest way forward is to change it to "#if 
> defined(CONFIG_DETECT_HUNG_TASK_BLOCKER) && !defined(CONFIG_PREEMPT_RT)" 
> to skip this feature for PREEMPT_RT right now . Otherwise, you will have 
> to deal with the rtmutex code.

If this isn't supported by PREEMPT_RT (yet), then just make the
DETECT_HUNG_TASK_BLOCKER in the Kconfig be:

	Depends on !PREEMPT_RT

Don't put that dependency in the code.

-- Steve