linux-kernel - Re: [dm-devel] [PATCH 2/2] block: Avoid deadlocks with bio allocation by stacking drivers

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Message-ID: <CAOS58YO5puV2iPhwe0vbyEydPnR=eWPStNRm=xEpMeo-TMHCaw@mail.gmail.com>
Date:	Mon, 10 Sep 2012 16:01:01 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>, axboe@...nel.dk,
	device-mapper development <dm-devel@...hat.com>,
	david@...morbit.com, linux-kernel@...r.kernel.org,
	linux-bcache@...r.kernel.org,
	Mikulas Patocka <mpatocka@...hat.com>, bharrosh@...asas.com,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [dm-devel] [PATCH 2/2] block: Avoid deadlocks with bio allocation
 by stacking drivers

Hello,

On Mon, Sep 10, 2012 at 3:50 PM, Alasdair G Kergon <agk@...hat.com> wrote:
>> >     Note that this doesn't do anything for allocation from other mempools.
>
> Note that dm has several cases of this, so this patch should not be used with
> dm yet.  Mikulas is studying those cases to see whether anything like this
> might be feasible/sensible or not.

IIUC, Kent posted a patch which converts all of them to use front-pad
(there's no reason not to, really). This better come after that but
it's not like this is gonna break something which isn't broken now.

Thanks.

-- 
tejun
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