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hung_task: add hung_task_sys_info sysctl to dump sys info on task-hung

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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.

[feng.tang@linux.alibaba.com: maintain consistecy established behavior, per Lance and Petr]
  Link: https://lkml.kernel.org/r/aRncJo1mA5Zk77Hr@U-2FWC9VHC-2323.local
Link: https://lkml.kernel.org/r/20251113111039.22701-3-feng.tang@linux.alibaba.com
Signed-off-by: Feng Tang <feng.tang@linux.alibaba.com>
Suggested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Feng Tang
2025-11-13 19:10:37 +08:00
committed by Andrew Morton
parent 5f264c00b6
commit 8b2b9b4f6f
2 changed files with 33 additions and 12 deletions
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5
Documentation/admin-guide/sysctl/kernel.rst
View File

@@ -422,6 +422,11 @@ the system boot.
This file shows up if ``CONFIG_DETECT_HUNG_TASK`` is enabled.
hung_task_sys_info
==================
A comma separated list of extra system information to be dumped when
hung task is detected, for example, "tasks,mem,timers,locks,...".
Refer 'panic_sys_info' section below for more details.
hung_task_timeout_secs
======================