From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759322AbZCZQYd (ORCPT ); Thu, 26 Mar 2009 12:24:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754773AbZCZQYX (ORCPT ); Thu, 26 Mar 2009 12:24:23 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:40020 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752532AbZCZQYW (ORCPT ); Thu, 26 Mar 2009 12:24:22 -0400 Date: Thu, 26 Mar 2009 09:14:28 -0700 (PDT) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: Andrew Morton cc: Frans Pop , mingo@elte.hu, tytso@mit.edu, jack@suse.cz, alan@lxorguk.ukuu.org.uk, arjan@infradead.org, a.p.zijlstra@chello.nl, npiggin@suse.de, jens.axboe@oracle.com, drees76@gmail.com, jesper@krogh.cc, linux-kernel@vger.kernel.org, oleg@redhat.com, roland@redhat.com Subject: Re: relatime: update once per day patches (was: ext3 IO latency measurements) In-Reply-To: <20090326084733.156c4910.akpm@linux-foundation.org> Message-ID: References: <20090325123744.GK23439@duck.suse.cz> <20090325150041.GM32307@mit.edu> <20090325185824.GO32307@mit.edu> <20090325215137.GQ32307@mit.edu> <20090325235041.GA11024@duck.suse.cz> <20090326090630.GA9369@elte.hu> <20090326113705.GV32307@mit.edu> <20090326140312.GB14822@elte.hu> <20090326140312.GB14822@elte.hu> <20090326073013.2fa83178.akpm@linux-foundation.org> <200903261632.42439.elendil@planet.nl> <20090326084733.156c4910.akpm@linux-foundation.org> 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 On Thu, 26 Mar 2009, Andrew Morton wrote: > > Hard-wiring a 24-hour interval into the core VFS for all mounted > filesystems is dumb. Umm. I generally agree witht he "leave policy to user space" people, but this is an area where (a) user space has shown itself to not get it right (ie people don't do even the existing relatime because distros don't) and (b) what's the alternative? > I (and others) pointed out that it would be better to implement this as > a mount option. That suggestion was met with varying sillinesses and > that is where things stand. I'd suggest first just doing the 24 hour thing, and then, IF user space actually ever gets its act together, and people care, and they _ask_ for a mount option, that's when it's worth doing. Linus