linux-kernel - Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]

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Message-ID: <20070726145952.GK27237@ftp.linux.org.uk>
Date:	Thu, 26 Jul 2007 15:59:52 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frank Kingswood <frank@...gswood-consulting.co.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ray Lee <ray-lk@...rabbit.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	ck list <ck@....kolivas.org>, Paul Jackson <pj@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]

On Thu, Jul 26, 2007 at 02:23:30PM +0200, Andi Kleen wrote:
> That would just save reading the directories. Not sure
> it helps that much. Much better would be actually if it didn't stat the 
> individual files (and force their dentries/inodes in). I bet it does that to 
> find out if they are directories or not. But in a modern system it could just 
> check the type in the dirent on file systems that support 
> that and not do a stat. Then you would get much less dentries/inodes.

FWIW, find(1) does *not* stat non-directories (and neither would this
approach).  So it's just dentries for directories and you can't realistically
skip those.  OK, you could - if you had banned cross-directory rename
for directories and propagated "dirty since last look" towards root (note
that it would be a boolean, not a timestamp).  Then we could skip unchanged
subtrees completely...
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