linux-kernel - Re: [RFC] [PATCH] Relative lazy atime

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Date:	Sat, 5 Aug 2006 17:11:05 -0700
From:	Chris Wedgwood <cw@...f.org>
To:	dean gaudet <dean@...tic.org>
Cc:	David Lang <dlang@...italinsight.com>,
	Mark Fasheh <mark.fasheh@...cle.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Dave Kleikamp <shaggy@...tin.ibm.com>,
	Christoph Hellwig <hch@....de>,
	Valerie Henson <val_henson@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Akkana Peck <akkana@...llowsky.com>,
	Jesse Barnes <jesse.barnes@...el.com>, jsipek@...sunysb.edu,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [RFC] [PATCH] Relative lazy atime

On Sat, Aug 05, 2006 at 04:28:29PM -0700, dean gaudet wrote:

> i can't understand when atime is *ever* reliable... root doing
> backups with something like rsync will cause atimes to change.

well, rsync and friends could use O_NOATIME, but usually that isn't
worth the pain

> you can work around mutt's silly dependancy on atime by configuring
> it with --enable-buffy-size.  so far mutt is the only program i've
> discovered which cares about atime.

i've seen other applications use it, but most are pretty tolerant
about it not working that way you might think it would

> also -- i wasn't aware that xfs tried to do a better job with atime
> updates... i'm not sure it's really that effective.  i've got a
> busy shell/mail/web server

OT, you might fine ikeep helps a little
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