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

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Date:	Fri, 27 Jul 2007 09:54:41 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Frank Kingswood <frank@...gswood-consulting.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	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 Fri, Jul 27, 2007 at 01:47:49AM -0700, Andrew Morton wrote:
> What I think is killing us here is the blockdev pagecache: the pagecache
> which backs those directory entries and inodes.  These pages get read
> multiple times because they hold multiple directory entries and multiple
> inodes.  These multiple touches will put those pages onto the active list
> so they stick around for a long time and everything else gets evicted.

I wonder what happens if you try that on ext2.  There we'd get directory
contents in per-directory page cache, so the picture might change...
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