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

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Date:	Mon, 18 Apr 2011 10:42:19 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	NeilBrown <neilb@...e.de>
CC:	Mike Snitzer <snitzer@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>
Subject: Re: [PATCH 05/10] block: remove per-queue plugging

On 2011-04-18 10:33, NeilBrown wrote:
> 
> 
> [[NOTE to dm-devel people - one of the patches here remove some
>  now-unused code from dm-raid.c plus a declaration from device-mapper.h ]]]
> 
> 
> On Mon, 18 Apr 2011 10:10:18 +0200 Jens Axboe <jaxboe@...ionio.com> wrote:
> 
>> On 2011-04-18 09:25, NeilBrown wrote:
> 
>>>>> Therefore md cannot put anything useful on the list in 'struct blk_plug'.
>>>
>>> That is the heart of the problem.
>>
>> Hmm, I don't really see a way to avoid the list in that case. You really
>> do need some way to queue items, a single callback or flag or pointer
>> will not suffice.
>>
>> I've added the patch and removed the (now) useless ->unplugged_fn
>> callback. I suggest you base your md changes on top of my for-linus
>> branch and tell me when you are confident it looks good, then I'll pull
>> in your MD changes and submit them later today.
>>
>> OK with you?
>>
> 
> Yes, that's perfect.  Thanks.
> 
> All of my plugging-related patches are now in a 'for-jens' branch:
> 
> The following changes since commit 99e22598e9a8e0a996d69c8c0f6b7027cb57720a:
> 
>   block: drop queue lock before calling __blk_run_queue() for kblockd punt (2011-04-18 09:59:55 +0200)
> 
> are available in the git repository at:
>   git://neil.brown.name/md for-jens
> 
> NeilBrown (6):
>       md: use new plugging interface for RAID IO.
>       md/dm - remove remains of plug_fn callback.
>       md - remove old plugging code.
>       md: provide generic support for handling unplug callbacks.
>       md: incorporate new plugging into raid5.
>       md: fix up raid1/raid10 unplugging.
> 
>  drivers/md/dm-raid.c          |    8 ----
>  drivers/md/md.c               |   87 +++++++++++++++++++++-------------------
>  drivers/md/md.h               |   26 ++----------
>  drivers/md/raid1.c            |   29 +++++++-------
>  drivers/md/raid10.c           |   27 ++++++-------
>  drivers/md/raid5.c            |   61 ++++++++++++----------------
>  drivers/md/raid5.h            |    2 -
>  include/linux/device-mapper.h |    1 -
>  8 files changed, 103 insertions(+), 138 deletions(-)

Great, thanks a lot Neil! It's pulled in now, will send the request to
Linus today.

-- 
Jens Axboe

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