linux-kernel - [PATCH] free swap space when (re)activating page

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Message-ID: <45D63445.5070005@redhat.com>
Date:	Fri, 16 Feb 2007 17:46:29 -0500
From:	Rik van Riel <riel@...hat.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
CC:	linux-mm <linux-mm@...ck.org>, Christoph Lameter <clameter@....com>
Subject: [PATCH] free swap space when (re)activating page

The attached patch does what I described in the other thread, it
makes the pageout code free swap space when swap is getting full,
by taking away the swap space from pages that get moved onto or
back onto the active list.

In some tests on a system with 2GB RAM and 1GB swap, it kept the
free swap at 500MB for a 2.3GB qsbench, while without the patch
over 950MB of swap was in use all of the time.

This should give kswapd more flexibility in what to swap out.

What do you think?

Signed-off-by: Rik van Riel <riel@...hat.com>

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View attachment "linux-2.6-swapfree.patch" of type "text/x-patch" (1989 bytes)