Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755805AbZDGOk0 (ORCPT ); Tue, 7 Apr 2009 10:40:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753284AbZDGOkJ (ORCPT ); Tue, 7 Apr 2009 10:40:09 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:39751 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752834AbZDGOkH (ORCPT ); Tue, 7 Apr 2009 10:40:07 -0400 Date: Tue, 7 Apr 2009 07:33:26 -0700 (PDT) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: Mark Lord cc: Ray Lee , Hua Zhong , Theodore Tso , Jens Axboe , Linux Kernel Mailing List Subject: Re: [PATCH 0/8][RFC] IO latency/throughput fixes In-Reply-To: <49DB56B8.1060805@rtr.ca> Message-ID: References: <1239022088-29002-1-git-send-email-jens.axboe@oracle.com> <20090406151054.GD5178@kernel.dk> <20090406183157.GD7376@mit.edu> <002501c9b6f3$f85b4910$e911db30$@com> <20090406211931.GB8586@mit.edu> <003001c9b6ff$a9259ce0$fb70d6a0$@com> <2c0942db0904061504l6504934bi446f7425fcd38470@mail.gmail.com> <49DB56B8.1060805@rtr.ca> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 831 Lines: 25 On Tue, 7 Apr 2009, Mark Lord wrote: > > What happens with ext3 "writeback", and ext4 "whatever", > when one does the quickie reboot method: > > ALT-SYSRQ-S ALT-SYSRQ-U ALT-SYSRQ-S ALT-SYSRQ-B > > ??? Since 's' syncs (I think 'u' does too, as part of making things read-only), the data blocks will be on disk after the boot regardless of any other ordering. Of course, it will leave all your lock-files files alone, and I can almost guarantee that some daemons (read: "NetworkManager") will then fail on the next boot because they think they are already running. Linus -- 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/