From: "Li,Rongqing" <lirongqing@baidu.com>
To: Lance Yang <lance.yang@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>
Cc: "corbet@lwn.net" <corbet@lwn.net>,
"mhiramat@kernel.org" <mhiramat@kernel.org>,
"paulmck@kernel.org" <paulmck@kernel.org>,
"pawan.kumar.gupta@linux.intel.com"
<pawan.kumar.gupta@linux.intel.com>,
"mingo@kernel.org" <mingo@kernel.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"kees@kernel.org" <kees@kernel.org>,
"arnd@arndb.de" <arnd@arndb.de>,
"feng.tang@linux.alibaba.com" <feng.tang@linux.alibaba.com>,
"pauld@redhat.com" <pauld@redhat.com>,
"joel.granados@kernel.org" <joel.granados@kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [外部邮件] Re: [PATCH][RFC] hung_task: Support to panic when the maximum number of hung task warnings is reached
Date: Tue, 23 Sep 2025 06:19:44 +0000 [thread overview]
Message-ID: <dfab5a3cc8984b56bf2d0d49ff06b47f@baidu.com> (raw)
In-Reply-To: <06facb7b-7d1b-44fd-b530-9a5300db7d4c@linux.dev>
> >> +1. I agree that a userspace detector seems more appropriate for this.
> >>
> >
> > I think the user-space maybe flexibility, but incurs relatively higher overhead
> and is less reliable. When the system hangs, this task may have already hung as
> well.
>
> Emmm... if the system is so degraded that a userspace monitor cannot get
> scheduled, it's very likely that khungtaskd itself is also struggling to run, right?
>
Yes
-Li
> >
> >
> >> We already have the hung_task_detect_count counter, so a userspace
> >> detector could easily use that to implement custom policies ;)
next prev parent reply other threads:[~2025-09-23 6:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-23 3:37 lirongqing
2025-09-23 3:45 ` Andrew Morton
2025-09-23 3:59 ` Lance Yang
2025-09-23 5:22 ` [外部邮件] " Li,Rongqing
2025-09-23 5:55 ` Lance Yang
2025-09-23 6:19 ` Li,Rongqing [this message]
2025-09-23 4:00 ` [????] " Li,Rongqing
2025-09-23 6:03 ` Paul E. McKenney
2025-09-23 6:16 ` [外部邮件] " Li,Rongqing
2025-09-23 7:01 ` Li,Rongqing
2025-09-23 4:35 ` Randy Dunlap
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