linux-kernel - Re: [PATCH v2 2/4] hung_task: Add hung_task_sys_info sysctl to dump sys info on task-hung

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Message-ID: <aRdMh3royGUDlO5V@pathway.suse.cz>
Date: Fri, 14 Nov 2025 16:36:39 +0100
From: Petr Mladek <pmladek@...e.com>
To: Feng Tang <feng.tang@...ux.alibaba.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Lance Yang <ioworker0@...il.com>, Jonathan Corbet <corbet@....net>,
	paulmck@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] hung_task: Add hung_task_sys_info sysctl to dump
 sys info on task-hung

On Thu 2025-11-13 19:10:37, Feng Tang wrote:
> When task-hung happens, developers may need different kinds of system
> information (call-stacks, memory info, locks, etc.) to help debugging.
> 
> Add 'hung_task_sys_info' sysctl knob to take human readable string like
> "tasks,mem,timers,locks,ftrace,...", and when task-hung happens, all
> requested information will be dumped. (refer kernel/sys_info.c for more
> details).
> 
> Meanwhile, the newly introduced sys_info() call is used to unify some
> existing info-dumping knobs.
> 
> Suggested-by: Petr Mladek <pmladek@...e.com>
> Signed-off-by: Feng Tang <feng.tang@...ux.alibaba.com>

It would have been better to split the refactoring (moving some logic
from check_hung_task()) into a separate patch.

But the result looks good. Feel free to use:

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr