From: Vivek Goyal <vgoyal@redhat.com>
To: Josh Hunt <joshhunt00@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-kernel@vger.kernel.org, tj@kernel.org
Subject: Re: multi-second application stall in open()
Date: Fri, 22 Jun 2012 16:42:07 -0400 [thread overview]
Message-ID: <20120622204207.GA22063@redhat.com> (raw)
In-Reply-To: <CAKA=qzY+u64vVZmbiH4zp_Fij2zejQBFUSNENKF=PZBT0G7xrQ@mail.gmail.com>
On Fri, Jun 22, 2012 at 03:22:01PM -0500, Josh Hunt wrote:
[..]
> It looks like my statement about busy_queues isn't entirely accurate.
> I'm seeing this later on in the trace:
Yes it is being called some times. But it is interesting to see that in
the instance you pasted in last mail, we did not see "schedule_dispatch"
message. Are you sure that other requests were queued at that point of
time and there were busy_queues? You can try printing cfqd->rq_queued
to verify that.
Also put some message in cfq_select_queue() to see why it did not select
a new queue before the stall.
Thanks
Vivek
next prev parent reply other threads:[~2012-06-22 20:42 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-06 21:56 multi-second application stall in open() Josh Hunt
2012-03-07 13:43 ` Josh Hunt
2012-03-07 16:28 ` Vivek Goyal
2012-03-07 18:56 ` Jens Axboe
2012-03-07 19:56 ` Vivek Goyal
2012-03-07 21:08 ` Josh Hunt
2012-03-08 22:22 ` Josh Hunt
2012-03-08 23:40 ` Vivek Goyal
[not found] ` <CAKA=qzbsL9UVYLZ3=hoT-1jfp=v=_Sr=h+YeHu0qAA=Ko_7P6w@mail.gmail.com>
2012-06-21 19:26 ` Josh Hunt
2012-06-21 20:32 ` Vivek Goyal
2012-06-21 20:36 ` Tejun Heo
2012-06-21 21:28 ` Josh Hunt
2012-06-21 21:32 ` Tejun Heo
2012-06-21 21:48 ` Rakesh Iyer
[not found] ` <CAOT6A4-a49wLHcQepUxJCDxOxfnSTEWa72OweLsmrea85OyrCg@mail.gmail.com>
2012-06-22 14:15 ` Vivek Goyal
2012-06-21 21:11 ` Josh Hunt
2012-06-22 14:12 ` Vivek Goyal
2012-06-22 20:05 ` Josh Hunt
2012-06-22 20:22 ` Josh Hunt
2012-06-22 20:42 ` Vivek Goyal [this message]
2012-06-22 20:53 ` Josh Hunt
2012-06-22 20:57 ` Josh Hunt
2012-06-22 21:34 ` Josh Hunt
2012-06-25 13:30 ` Vivek Goyal
2012-06-25 16:22 ` Josh Hunt
2012-06-25 21:18 ` Vivek Goyal
2012-06-25 23:05 ` Josh Hunt
2012-06-26 4:01 ` Josh Hunt
2012-06-26 12:59 ` Vivek Goyal
2012-06-26 15:18 ` Josh Hunt
2012-06-26 15:53 ` Vivek Goyal
2012-06-26 20:37 ` Josh Hunt
2012-06-26 20:56 ` Tejun Heo
[not found] ` <CAKA=qzbBtteDjHiPogCvN5jOSiPrDxx=vn96p02bXUy=6=jAgA@mail.gmail.com>
2012-06-26 23:44 ` Josh Hunt
2012-06-27 17:21 ` Josh Hunt
2012-06-27 17:38 ` Tejun Heo
2012-06-27 17:44 ` Josh Hunt
2012-06-27 17:54 ` Tejun Heo
2012-06-27 17:59 ` Josh Hunt
2012-06-29 23:02 ` Tejun Heo
2012-06-30 0:37 ` Josh Hunt
2012-07-04 1:12 ` Tejun Heo
2012-07-18 17:48 ` Tejun Heo
2012-06-26 20:43 ` Tejun Heo
2012-06-25 17:26 ` Tejun Heo
2012-03-07 19:47 ` Josh Hunt
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