linux-kernel - Re: [PATCH] VM: Implements the swap-out page-clustering technique

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Message-ID: <20080904191406.40ca789d@bree.surriel.com>
Date:	Thu, 4 Sep 2008 19:14:06 -0400
From:	Rik van Riel <riel@...hat.com>
To:	hamid.jahanjou@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] VM: Implements the swap-out page-clustering technique

On Thu, 04 Sep 2008 15:34:30 +0330
"Hamid R. Jahanjou" <hamid.jahanjou@...il.com> wrote:

> From: Hamid R. Jahanjou
> 
> Implements the idea of swap-out page clustering from *BSD for
> Linux. Each time a candidate page is to be swapped out,
> virtually-nearby pages are scanned to find eligible pages to be
> swapped out too as a cluster. This technique increases the likelihood of
> bringing in related data on a page fault and decreases swap space
> fragmentation in the long run. Currently, Linux searches only
> physically-nearby pages which is not optimal since, over time, physically-
> adjacent pages may become unrelated.
> 
> The code can be statically tuned. No benchmarks. I'm not sure whether
> the added complexity is acceptable.

It would be good to get some idea of what testing you have done
with this patch.

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