linux-kernel - Re: [dm-devel] [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers

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Date:	Wed, 29 Aug 2012 17:57:58 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Jens Axboe <axboe@...nel.dk>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
	bharrosh@...asas.com, tj@...nel.org, vgoyal@...hat.com
Subject: Re: [dm-devel] [PATCH v7 9/9] block: Avoid deadlocks with bio
	allocation by stacking drivers

On Wed, Aug 29, 2012 at 09:50:06AM -0700, Kent Overstreet wrote:
> The other thing we could do is make the rescuer thread per block device
> (which arguably makes more sense than per bio_set anyways), then
> associate bio_sets with specific block devices/rescuers.
 
For dm, it's equivalent - already one bioset required per live device:
dm_alloc_md_mempools().

Alasdair

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