linux-kernel - Re: [PATCH v4] relatime: Make relatime smarter

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Date:	Thu, 27 Nov 2008 15:35:14 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Andreas Dilger <adilger@....com>
Cc:	Matthew Garrett <mjg@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mingo@...hat.com, val.henson@...il.com
Subject: Re: [PATCH v4] relatime: Make relatime smarter

On Thu, Nov 27, 2008 at 03:08:39PM -0700, Andreas Dilger wrote:
> On Nov 27, 2008  17:58 +0000, Matthew Garrett wrote:
> > +	relatime_interval=
> > +			[FS] relative atime update frequency, in seconds.
> > +			(default: 1 day: 86400 seconds)
> 
> The one problem with a 1-day default is that cron jobs like updatedb will
> revert to updating the atime on every single file every day.  It would be
> better to make it slightly more than 1 day (e.g. 25h) to avoid this and
> at least defer atime updates to every other day for files that are not
> otherwise accessed except by cron.

Doesn't updatedb only access directories, not files?  I don't think
relatime implies nodiratime, but certainly the two could both be
specified, and that would fix one of the updatedb problems.  Are there
any other common cronjobs you're concerned about?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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