Date: Thu, 3 Aug 2006 02:44:49 -0400
From: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
To: Valerie Henson <val_henson@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
       Akkana Peck <akkana@shallowsky.com>,
       Mark Fasheh <mark.fasheh@oracle.com>,
       Jesse Barnes <jesse.barnes@intel.com>,
       Arjan van de Ven <arjan@linux.intel.com>, Chris Wedgewood <cw@foof.org>,
       jsipek@cs.sunysb.edu, Al Viro <viro@ftp.linux.org.uk>,
       Christoph Hellwig <hch@lst.de>
Subject: Re: [RFC] [PATCH] Relative lazy atime
Message-ID: <20060803064449.GE27104@filer.fsl.cs.sunysb.edu>
References: <20060803062944.GA8631@goober>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20060803062944.GA8631@goober>
User-Agent: Mutt/1.4.1i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1145
Lines: 27

On Wed, Aug 02, 2006 at 11:29:45PM -0700, Valerie Henson wrote:
> My friend Akkana followed my advice to use noatime on one of her
> machines, but discovered that mutt was unusable because it always
> thought that new messages had arrived since the last time it had
> checked a folder (mbox format).  I thought this was a bummer, so I
> wrote a "relative lazy atime" patch which only updates the atime if
> the old atime was less than the ctime or mtime.  This is not the same
> as the lazy atime patch of yore[1], which maintained a list of inodes
> with dirty atimes and wrote them out on unmount.
 
This also happens to be useful for file systems such as Unionfs and (from
what I hear) ocfs2 where atime updates can be costly at times.

> Patch below.  Current version (plus test program) is at:

Looks fine IMHO.

Josef "Jeff" Sipek.

-- 
I'm somewhere between geek and normal.
		- Linus Torvalds
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/