Date: Thu, 27 Nov 2008 15:08:39 -0700
From: Andreas Dilger <adilger@sun.com>
Subject: Re: [PATCH v4] relatime: Make relatime smarter
In-reply-to: <20081127175813.GA24354@srcf.ucam.org>
To: Matthew Garrett <mjg@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Randy Dunlap <randy.dunlap@oracle.com>, linux-kernel@vger.kernel.org,
       linux-fsdevel@vger.kernel.org, mingo@redhat.com, val.henson@gmail.com,
       matthew@wil.cx
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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.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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