From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752376Ab1IUPRj (ORCPT ); Wed, 21 Sep 2011 11:17:39 -0400 Received: from 173-166-109-252-newengland.hfc.comcastbusiness.net ([173.166.109.252]:45530 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752042Ab1IUPRi (ORCPT ); Wed, 21 Sep 2011 11:17:38 -0400 Date: Wed, 21 Sep 2011 11:17:32 -0400 From: Christoph Hellwig To: Konrad Rzeszutek Wilk Cc: axboe@kernel.dk, linux-kernel@vger.kernel.org, jaxboe@fusionio.com, lidongyang@novell.com, joe.jin@oracle.com Subject: Re: [GIT PULL] (xen) stable/for-jens-3.2 - blkback and blkfront patches for 3.2 Message-ID: <20110921151732.GA28043@infradead.org> References: <20110921150955.GH541@phenom.oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110921150955.GH541@phenom.oracle.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 21, 2011 at 11:09:55AM -0400, Konrad Rzeszutek Wilk wrote: > Hey Jens, > > Please pull the following git tree in your 3.2 drivers tree: > > git pull git://oss.oracle.com/git/kwilk/xen.git stable/for-jens-3.2 > > which has an exciting new feature - the discard ('feature-discard') > aka TRIM/UNMAP. Now they can be passed from the guest to the backend. What is the design of them? Do you provide the 'discard zeroes data' flag (mandatory for any kind of relible operation) and 'discard granularity / alignment' tunables (very useful)?