From: Andrew Morton <akpm@linux-foundation.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: clingutla@codeaurora.org, kimran@codeaurora.org,
mingo@kernel.org, peterz@infradead.org, mcgrof@kernel.org,
keescook@chromium.org, shile.zhang@nokia.com,
matt@codeblueprint.co.uk, vegard.nossum@oracle.com,
jsiddle@redhat.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [RFC] hung task: check specific tasks for long uninterruptible sleep state
Date: Wed, 8 Nov 2017 15:44:29 -0800 [thread overview]
Message-ID: <20171108154429.909e12c5f7141cde37416469@linux-foundation.org> (raw)
In-Reply-To: <201711082057.IDF56726.OMHOSFVFJtQOFL@I-love.SAKURA.ne.jp>
On Wed, 8 Nov 2017 20:57:42 +0900 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> wrote:
> Lingutla Chandrasekhar wrote:
> > Some tasks may intentionally moves to uninterruptable sleep state,
> > which shouldn't leads to khungtask panics, as those are recoverable
> > hungs. So to avoid false hung reports, add an option to select tasks
> > to be monitored and report/panic them only.
>
> What are backtraces of such tasks? Please point the locations in the code.
>
> If they are absolutely recoverable, why can't we let themselves declare that
> "I'm intentionally in uninterruptible state. But there is no dependency that
> prevents me from recovering. So, please ignore me." using per "struct
> task_struct" flags rather than introducing userspace controlled interface?
Yes. Please tell us much much much more about the use case and
scenarios which inspired this change.
next prev parent reply other threads:[~2017-11-08 23:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-21 10:25 [PATCH] RFC: hung task: Check specific tasks for long uninterruptible sleep state Imran Khan
2017-08-22 1:54 ` Zhang, Shile (NSB - CN/Hangzhou)
2017-08-22 6:03 ` Imran Khan
2017-08-22 6:49 ` Zhang, Shile (NSB - CN/Hangzhou)
2017-08-22 20:36 ` Peter Zijlstra
2017-08-23 12:25 ` Imran Khan
2017-11-08 6:28 ` [RFC] hung task: check " Lingutla Chandrasekhar
2017-11-08 11:57 ` Tetsuo Handa
2017-11-08 23:44 ` Andrew Morton [this message]
2017-11-09 1:54 ` Luis R. Rodriguez
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