From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [tracing, hang] dumping events gets stuck in synchronise_sched
Date: Tue, 17 Aug 2010 16:37:44 +0800 [thread overview]
Message-ID: <4C6A4A58.2030904@cn.fujitsu.com> (raw)
In-Reply-To: <20100817073725.GO10429@dastard>
On 08/17/2010 03:37 PM, Dave Chinner wrote:
> Tracing folks,
>
> I've got a machine stuck with a cpu spinning in a tight loop (the
> new writeback/sync livelock avoidance code is, well, livelocking),
> and I was trying to find out what triggered by using the writeback
> trace events. Unfortunately, I can't dump the trace events because
> it gets stuck here:
>
> Given that the trace events are there mainly for debugging, this
> seems like a bit of an oversight - hanging a CPU in a tight loop is
> not an uncommon event during code development....
>
You can try 'cat trace_pipe', if I did not miss you meaning.
Lai
next prev parent reply other threads:[~2010-08-17 8:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-17 7:37 [tracing, hang] dumping events gets stuck in synchronise_sched Dave Chinner
2010-08-17 8:37 ` Lai Jiangshan [this message]
2010-08-17 11:52 ` Dave Chinner
2010-08-17 13:02 ` Steven Rostedt
2010-08-17 22:40 ` Dave Chinner
2010-08-17 23:07 ` Steven Rostedt
2010-08-18 0:55 ` Dave Chinner
2010-08-18 1:07 ` Steven Rostedt
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