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

From: Jens Axboe
Date: Thu Mar 17 2011 - 14:31:16 EST

On 2011-03-17 16:51, Mike Snitzer wrote:
> On Tue, Mar 08 2011 at 5:05pm -0500,
> Mike Snitzer <snitzer@xxxxxxxxxx> wrote:
>> On Tue, Mar 08 2011 at 3:27pm -0500,
>> Jens Axboe <jaxboe@xxxxxxxxxxxx> wrote:
>>> On 2011-03-08 21:21, Mike Snitzer wrote:
>>>> On Tue, Mar 08 2011 at 7:16am -0500,
>>>> Jens Axboe <jaxboe@xxxxxxxxxxxx> 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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