From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754230Ab2H2RXx (ORCPT ); Wed, 29 Aug 2012 13:23:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:8666 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753626Ab2H2RXv (ORCPT ); Wed, 29 Aug 2012 13:23:51 -0400 Date: Wed, 29 Aug 2012 18:23:36 +0100 From: Alasdair G Kergon To: Kent Overstreet Cc: Vivek Goyal , Jens Axboe , dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-bcache@vger.kernel.org, Mikulas Patocka , bharrosh@panasas.com, tj@kernel.org Subject: Re: [dm-devel] [PATCH v7 9/9] block: Avoid deadlocks with bio allocation by stacking drivers Message-ID: <20120829172336.GB5576@agk-dp.fab.redhat.com> Mail-Followup-To: Kent Overstreet , Vivek Goyal , Jens Axboe , dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-bcache@vger.kernel.org, Mikulas Patocka , bharrosh@panasas.com, tj@kernel.org References: <1346175456-1572-1-git-send-email-koverstreet@google.com> <1346175456-1572-10-git-send-email-koverstreet@google.com> <20120829165006.GB20312@google.com> <20120829170711.GC12504@redhat.com> <20120829171345.GC20312@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120829171345.GC20312@google.com> Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: 64 Baker Street, 4th floor, London, W1U 7DF. User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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