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Date: Fri, 2 Mar 2007 17:18:18 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH] free swap space of (re)activated pages
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On Fri, 02 Mar 2007 15:31:19 -0500
Rik van Riel <riel@redhat.com> wrote:

> the attached patch frees the swap space of already resident pages
> when swap space starts getting tight, instead of only freeing up
> the swap space taken up by newly swapped in pages.
> 
> This should result in the swap space of pages that remain resident
> in memory being freed, allowing kswapd more chances to actually swap
> a page out (instead of rotating it back onto the active list).

Fair enough.   How do we work out if this helps things?