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

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Message-ID: <20060809063947.GA13474@goober>
Date:	Tue, 8 Aug 2006 23:39:49 -0700
From:	Valerie Henson <val_henson@...ux.intel.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	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>,
	Dave Kleikamp <shaggy@...tin.ibm.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 Sat, Aug 05, 2006 at 09:01:47PM -0600, Matthew Wilcox wrote:
> On Sat, Aug 05, 2006 at 04:28:29PM -0700, dean gaudet wrote:
> > 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.
> 
> For the shell, atime is the difference between 'you have mail' and 'you
> have new mail'.
> 
> I still don't understand though, how much does this really buy us over
> nodiratime?

Lazy atime buys us a reduction in writes over nodiratime for any
workload which reads files, such as grep -r, a kernel compile, or
backup software.  Do I misunderstand the question?

-VAL
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