linux-kernel - Re: [PATCH -mm] mm: more likely reclaim MADV

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Message-ID: <20080719135930.3b55381b@bree.surriel.com>
Date:	Sat, 19 Jul 2008 13:59:30 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Johannes Weiner <hannes@...urebad.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nossum <vegard.nossum@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] mm: more likely reclaim MADV_SEQUENTIAL mappings

On Sat, 19 Jul 2008 19:31:49 +0200
Johannes Weiner <hannes@...urebad.de> wrote:

> File pages accessed only once through sequential-read mappings between
> fault and scan time are perfect candidates for reclaim.
> 
> This patch makes page_referenced() ignore these singular references and
> the pages stay on the inactive list where they likely fall victim to the
> next reclaim phase.

Which is exactly what the madvise man page says about pages in
MADV_SEQUENTIAL ranges.  Yay.

       MADV_SEQUENTIAL
              Expect  page  references  in sequential order.  (Hence, pages in
              the given range can be aggressively read ahead, and may be freed
              soon after they are accessed.)

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