Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760585AbZC0Uj2 (ORCPT ); Fri, 27 Mar 2009 16:39:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754484AbZC0UjT (ORCPT ); Fri, 27 Mar 2009 16:39:19 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:53162 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753182AbZC0UjS (ORCPT ); Fri, 27 Mar 2009 16:39:18 -0400 Message-ID: <49CD394B.9080903@garzik.org> Date: Fri, 27 Mar 2009 16:38:35 -0400 From: Jeff Garzik User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Christoph Hellwig CC: Theodore Tso , Jens Axboe , Linus Torvalds , Ingo Molnar , Alan Cox , Arjan van de Ven , Andrew Morton , Peter Zijlstra , Nick Piggin , David Rees , Jesper Krogh , Linux Kernel Mailing List Subject: Re: Linux 2.6.29 References: <20090324184549.GE32307@mit.edu> <49C93AB0.6070300@garzik.org> <20090325093913.GJ27476@kernel.dk> <49CA86BD.6060205@garzik.org> <20090325194341.GB27476@kernel.dk> <49CA9346.6040108@garzik.org> <20090327075723.GT27476@kernel.dk> <20090327141333.GS6239@mit.edu> <20090327143543.GA17541@infradead.org> In-Reply-To: <20090327143543.GA17541@infradead.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.4 (----) X-Spam-Report: SpamAssassin version 3.2.5 on srv5.dvmed.net summary: Content analysis details: (-4.4 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 786 Lines: 19 Christoph Hellwig wrote: > And please add a tuneable for the flush. Preferable a generic one at > the block device layer instead of the current mess where every > filesystem has a slightly different option for barrier usage. At the very least, IMO the block layer should be able to notice when barriers need not be translated into cache flushes. Most notably when wb cache is disabled on the drive, something easy to auto-detect, but probably a manual switch also, for people with enterprise battery-backed storage and such. Jeff -- 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/