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

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Message-Id: <1155128301.10228.2.camel@kleikamp.austin.ibm.com>
Date:	Wed, 09 Aug 2006 07:58:20 -0500
From:	Dave Kleikamp <shaggy@...tin.ibm.com>
To:	Jörn Engel <joern@...nheim.fh-wedel.de>
Cc:	Valerie Henson <val_henson@...ux.intel.com>,
	Matthew Wilcox <matthew@....cx>, dean gaudet <dean@...tic.org>,
	David Lang <dlang@...italinsight.com>,
	Mark Fasheh <mark.fasheh@...cle.com>,
	Chris Wedgwood <cw@...f.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Christoph Hellwig <hch@....de>, 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 Wed, 2006-08-09 at 14:21 +0200, Jörn Engel wrote:
> 1. standard
> Every read access to a file/directory causes an atime update.
> 
> 2. nodiratime
> Every read access to a non-directory causes an atime update.
> 
> 3. lazy atime
> The first read access to a file/directory causes an atime update.
> 
> 4. noatime
> No read access to a file/directory causes an atime update.
> 
> In comparison, lazy atime will cause more atime updates for
> directories and vastly fewer for non-directories.

Using nodiratime and lazy atime together would probably be the best
option for those that only want atime for mutt/shell mail notification.

>  Effectively atime
> is turned into little more than a flag, stating whether the file was
> ever read since the last write to it.  And it appears as if neither
> mutt nor the shell use atime for more than this flagging purpose, so I
> am rather fond of the idea.
> 
> Jörn
> 
-- 
David Kleikamp
IBM Linux Technology Center

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