linux-kernel - Re: [PATCH V2] umem: fix up unplugging

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Date:	Thu, 14 Jun 2012 23:50:26 +0800
From:	Tao Guo <glorioustao@...il.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>,
	Shaohua Li <shli@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH V2] umem: fix up unplugging

Thanks Jens. I can do that for 3.6 kernel.
-Tao

On Thu, Jun 14, 2012 at 3:18 AM, Jens Axboe <jaxboe@...ionio.com> wrote:
> On Thu, Jun 07 2012, Tao Guo wrote:
>> Fix a regression introduced by 7eaceaccab5f40 ("block: remove per-queue
>> plugging").  In that patch, Jens removed the whole mm_unplug_device()
>> function, which used to be the trigger to make umem start to work.
>>
>> We need to implement unplugging to make umem start to work, or I/O will
>> never be triggered.
>
> Applied this one, dropped the other two. Would still be nice to move
> this generic functionality into the block core and unify md/umem in this
> regard for 3.6, if you would like to do that.
>
> --
> Jens Axboe
>
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