Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752644Ab1E1Hoz (ORCPT ); Sat, 28 May 2011 03:44:55 -0400 Received: from 173-166-109-252-newengland.hfc.comcastbusiness.net ([173.166.109.252]:32837 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752170Ab1E1How (ORCPT ); Sat, 28 May 2011 03:44:52 -0400 Date: Sat, 28 May 2011 03:44:49 -0400 From: Christoph Hellwig To: Namhyung Kim Cc: Christoph Hellwig , Jens Axboe , Mike Snitzer , "linux-kernel@vger.kernel.org" , Tejun Heo Subject: Re: [PATCH 1/2] blktrace: treat flush as barrier Message-ID: <20110528074449.GB22382@infradead.org> References: <1306501883-23498-1-git-send-email-namhyung@gmail.com> <20110527131237.GA27647@infradead.org> <1306509182.1351.1.camel@leonhard> <4DE006C5.4010906@fusionio.com> <20110527202747.GA4803@infradead.org> <1306548581.1679.12.camel@leonhard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1306548581.1679.12.camel@leonhard> 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 Content-Length: 622 Lines: 13 On Sat, May 28, 2011 at 11:09:41AM +0900, Namhyung Kim wrote: > AFAIK FLUSH always precedes WRITE and then followed by FUA, so how about Right now most do because that's how the old barriers worked, but it's going to change. For $NEXT + 1 I have a patch that for will make xfs sends FUA without flushes in a lot of cases, and afaik some device mapper code already does now. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/