linux-kernel - Re: [PATCH] mm/filemap.c: unconditionally call mark_page

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Message-ID: <20070315225928.GF6687@v2.random>
Date:	Thu, 15 Mar 2007 23:59:29 +0100
From:	Andrea Arcangeli <andrea@...e.de>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Nick Piggin <npiggin@...e.de>, Chuck Ebbert <cebbert@...hat.com>,
	Ashif Harji <asharji@...uwaterloo.ca>,
	Miquel van Smoorenburg <miquels@...tron.nl>,
	linux-mm@...ck.org, Jan Kara <jack@...e.cz>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] mm/filemap.c: unconditionally call mark_page_accessed

On Thu, Mar 15, 2007 at 05:44:01PM +0000, Hugh Dickins wrote:
> who removed the !offset condition, he should be consulted on its
> reintroduction.

the !offset check looks a pretty broken heuristic indeed, it would
break random I/O. The real fix is to add a ra.prev_offset along with
ra.prev_page, and if who implements it wants to be stylish he can as
well use a ra.last_contiguous_read structure that has a page and
offset fields (and then of course remove ra.prev_page).
-
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