linux-kernel - Re: [PATCH 05/10] block: remove per-queue plugging

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Date:	Thu, 17 Mar 2011 19:31:03 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>
Subject: Re: [PATCH 05/10] block: remove per-queue plugging

On 2011-03-17 16:51, Mike Snitzer wrote:
> On Tue, Mar 08 2011 at  5:05pm -0500,
> Mike Snitzer <snitzer@...hat.com> wrote:
> 
>> On Tue, Mar 08 2011 at  3:27pm -0500,
>> Jens Axboe <jaxboe@...ionio.com> wrote:
>>
>>> On 2011-03-08 21:21, Mike Snitzer wrote:
>>>> On Tue, Mar 08 2011 at  7:16am -0500,
>>>> Jens Axboe <jaxboe@...ionio.com> wrote:
>>>>
>>>>> On 2011-03-03 23:13, Mike Snitzer wrote:
>>>>>> I'm now hitting a lockdep issue, while running a 'for-2.6.39/stack-plug'
>>>>>> kernel, when I try an fsync heavy workload to a request-based mpath
>>>>>> device (the kernel ultimately goes down in flames, I've yet to look at
>>>>>> the crashdump I took)
>>>>>
>>>>> Mike, can you re-run with the current stack-plug branch? I've fixed the
>>>>> !CONFIG_BLOCK and rebase issues, and also added a change for this flush
>>>>> on schedule event. It's run outside of the runqueue lock now, so
>>>>> hopefully that should solve this one.
>>>>
>>>> Works for me, thanks.
>>>
>>> Super, thanks! Out of curiousity, did you use dm/md?
>>
>> Yes, I've been using a request-based DM multipath device.
> 
> 
> Against latest 'for-2.6.39/core', I just ran that same fsync heavy
> workload against XFS (ontop of a DM multipath volume).  ffsb induced the
> following hangs (ripple effect causing NetworkManager to get hung up on
> this data-only XFS volume, etc):

Ugh. Care to send the recipee for how to reproduce this? Essentially
just looks like IO got stuck.

-- 
Jens Axboe

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