From: Tejun Heo <tj@kernel.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Hugh Dickins <hughd@google.com>,
Shaohua Li <shaohua.li@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
linux-next@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org,
x86@kernel.org
Subject: Re: [PATCH block/for-3.3/core] block: an exiting task should be allowed to create io_context
Date: Tue, 3 Jan 2012 14:35:05 -0800 [thread overview]
Message-ID: <20120103223505.GI31746@google.com> (raw)
In-Reply-To: <20120103221301.GH31746@google.com>
On Tue, Jan 03, 2012 at 02:13:01PM -0800, Tejun Heo wrote:
> > That's pretty odd. Given Hughs report as well, it sure does sound like
> > we now have some life time issues with cfqq's.
>
> Hmmm... I disabled cfqq merge logic (commented out
> cfq_close_cooperator() and the following cfq_setup_merge() calls) in
> cfq_select_queue() and neither is triggering for quite a while now.
> Maybe cfqq refcnt is getting borked over cfqq merging / splitting? It
> would also explain the low frequency of the issue too. I'll try to
> further isolate it but It would be awesome if someone more familiar
> with the logic can go over that part.
Scrap that. It triggered and yeah cfq_get_next_queue() is retrieving
empty cfqq from the service tree.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-01-03 22:35 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 6:47 linux-next: Tree for Dec 21 Stephen Rothwell
2011-12-21 20:11 ` linux-next: Tree for Dec 21 (xen) Randy Dunlap
2011-12-21 19:30 ` Konrad Rzeszutek Wilk
2011-12-21 20:32 ` [PATCH] usb: fix renesas mod_gadget printk format warning Randy Dunlap
2011-12-21 21:16 ` Felipe Balbi
2011-12-21 22:19 ` Randy Dunlap
2011-12-21 21:24 ` Greg KH
2011-12-21 23:15 ` linux-next: Tree for Dec 21 Andrew Morton
2011-12-22 23:08 ` Andrew Morton
2011-12-22 23:20 ` Tejun Heo
2011-12-22 23:24 ` Andrew Morton
2011-12-22 23:38 ` Tejun Heo
2011-12-22 23:44 ` Andrew Morton
2011-12-22 23:46 ` Tejun Heo
2011-12-23 0:42 ` Tejun Heo
2011-12-24 5:13 ` Hugh Dickins
2011-12-25 1:02 ` [PATCH block/for-3.3/core] block: an exiting task should be allowed to create io_context Tejun Heo
2011-12-25 13:29 ` Jens Axboe
2011-12-27 22:07 ` Andrew Morton
2011-12-28 8:33 ` Hugh Dickins
2011-12-28 16:48 ` Tejun Heo
2011-12-28 17:50 ` Hugh Dickins
2011-12-28 17:55 ` Tejun Heo
2011-12-28 21:19 ` Tejun Heo
2011-12-28 21:19 ` Tejun Heo
2012-01-03 17:35 ` Tejun Heo
2012-01-03 17:59 ` Tejun Heo
2012-01-03 20:09 ` Tejun Heo
2012-01-03 20:20 ` Jens Axboe
2012-01-03 22:13 ` Tejun Heo
2012-01-03 22:35 ` Tejun Heo [this message]
2012-01-05 1:24 ` Tejun Heo
2012-01-05 18:36 ` Hugh Dickins
2012-01-05 18:38 ` Tejun Heo
2012-01-06 2:17 ` [PATCH block:for-3.3/core] cfq: merged request shouldn't jump to a different cfqq Tejun Heo
2012-01-06 2:36 ` Tejun Heo
2012-01-06 3:14 ` Shaohua Li
2012-01-06 3:04 ` Tejun Heo
2012-01-06 3:30 ` Tejun Heo
2012-01-06 3:52 ` [PATCH block:for-3.3/core] block: disable ELEVATOR_INSERT_SORT_MERGE Tejun Heo
2012-01-06 4:19 ` Shaohua Li
2012-01-06 4:38 ` Tejun Heo
2012-01-06 8:15 ` Shaohua Li
2012-01-06 15:34 ` Tejun Heo
2012-01-06 3:34 ` [PATCH block:for-3.3/core] cfq: merged request shouldn't jump to a different cfqq Shaohua Li
2012-01-06 3:22 ` Tejun Heo
2012-01-06 4:15 ` Shaohua Li
2012-01-06 4:40 ` Tejun Heo
2012-01-06 2:47 ` Shaohua Li
2011-12-25 16:08 ` linux-next: Tree for Dec 21 Sedat Dilek
2011-12-25 23:55 ` Stephen Rothwell
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