Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers

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Subject: Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
From: Alasdair G Kergon <agk@xxxxxxxxxx>
Date: Wed, 29 Aug 2012 18:23:36 +0100
Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-bcache@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dm-devel@xxxxxxxxxx, Mikulas Patocka <mpatocka@xxxxxxxxxx>, bharrosh@xxxxxxxxxxx, tj@xxxxxxxxxx, Vivek Goyal <vgoyal@xxxxxxxxxx>
In-reply-to: <20120829171345.GC20312@google.com>
Mail-followup-to: Kent Overstreet <koverstreet@xxxxxxxxxx>, Vivek Goyal <vgoyal@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, dm-devel@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-bcache@xxxxxxxxxxxxxxx, Mikulas Patocka <mpatocka@xxxxxxxxxx>, bharrosh@xxxxxxxxxxx, tj@xxxxxxxxxx
Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: 64 Baker Street, 4th floor, London, W1U 7DF.
References: <1346175456-1572-1-git-send-email-koverstreet@google.com> <1346175456-1572-10-git-send-email-koverstreet@google.com> <Pine.LNX.4.64.1208291210180.774@file.rdu.redhat.com> <20120829165006.GB20312@google.com> <20120829170711.GC12504@redhat.com> <20120829171345.GC20312@google.com>
Reply-to: device-mapper development <dm-devel@xxxxxxxxxx>
User-agent: Mutt/1.5.18 (2008-05-17)

On Wed, Aug 29, 2012 at 10:13:45AM -0700, Kent Overstreet wrote:
> Only on allocation failure.
 
Which as you already said assumes wrapping together the other mempools in the
submission path first...

Alasdair

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Follow-Ups:
- Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
  - From: Kent Overstreet

References:
- [PATCH v7 0/9] Block cleanups, deadlock fix
  - From: Kent Overstreet
- [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
  - From: Kent Overstreet
- Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
  - From: Mikulas Patocka
- Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
  - From: Kent Overstreet
- Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
  - From: Vivek Goyal
- Re: [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers
  - From: Kent Overstreet

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