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

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Message-ID: <20070711204143.GA3921@ucw.cz>
Date:	Wed, 11 Jul 2007 20:41:44 +0000
From:	Pavel Machek <pavel@....cz>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Andi Kleen <andi@...stfloor.org>, 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]

Hi!

> > 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...

Could we help it a little from kernel and set 'dirty since last look'
on directory renames?

I mean, this is not only updatedb. KDE startup is limited by this,
too. It would be nice to have effective 'what change in tree'
operation.
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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