linux-kernel - Re: multi-second application stall in open()

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Message-ID: <20120626205651.GW3869@google.com>
Date:	Tue, 26 Jun 2012 13:56:51 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Josh Hunt <joshhunt00@...il.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org
Subject: Re: multi-second application stall in open()

Hey,

On Tue, Jun 26, 2012 at 03:37:31PM -0500, Josh Hunt wrote:
> The print "cfq schedule dispatch: busy_queues:1 rq_queued:1
> rq_in_driver:0 rq_in_flight[0]:0 [1]:0" is inside the if to call
> kblockd_schedule_work() so it is getting called, but you can see that
> we never see the workqueue_queue_work tracepoint being hit.

Hmm... looks like the work item is already queued.  Can you please
move the "schedule dispatch" message after kblockd_schedule_work() and
print its return value too?

> Tejun - if you could let me know what other data I should be looking
> for/need to enable in the traces I would appreciate it.

The trace seems truncated and doesn't contain 9527.XXXX traces.  Can
you please resend?

Thanks.

-- 
tejun
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