linux-kernel - Re: relatime: update once per day patches (was: ext3 IO latency measurements)

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Date:	Thu, 26 Mar 2009 08:47:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frans Pop <elendil@...net.nl>
Cc:	mingo@...e.hu, tytso@....edu, jack@...e.cz,
	torvalds@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	arjan@...radead.org, a.p.zijlstra@...llo.nl, npiggin@...e.de,
	jens.axboe@...cle.com, drees76@...il.com, jesper@...gh.cc,
	linux-kernel@...r.kernel.org, oleg@...hat.com, roland@...hat.com
Subject: Re: relatime: update once per day patches (was: ext3 IO latency
 measurements)

On Thu, 26 Mar 2009 16:32:38 +0100 Frans Pop <elendil@...net.nl> wrote:

> Andrew Morton wrote:
> > On Thu, 26 Mar 2009 15:03:12 +0100 Ingo Molnar <mingo@...e.hu> wrote:
> >> Why arent the relatime patches upstream?
> > 
> > They have been for ages.
> 
> I assume Ingo means the patches to make relatime update atime at least 
> once per day to ensure better compatibility with apps that do use or rely 
> on access times.
> These patches are already being included by several distros and, FWIW, 
> Debian would like to see them upstream as well because we feel .
> 
> They were last submitted by Matthew Garrett:
> http://lkml.org/lkml/2008/11/27/234
> http://lkml.org/lkml/2008/11/27/235
> 
> Loads of people seem to want this, but even though it's been submitted at 
> least twice and discussed even more often, it never gets anywhere.
> 

Hard-wiring a 24-hour interval into the core VFS for all mounted
filesystems is dumb.

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.
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