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

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Message-ID: <20070220190005.GQ21484@holomorphy.com>
Date:	Tue, 20 Feb 2007 11:00:05 -0800
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] free swap space when (re)activating page

On Fri, Feb 16, 2007 at 05:46:29PM -0500, Rik van Riel wrote:
> 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>

I would call this a bugfix, not an optimization.


-- wli
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