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Date: Tue, 18 Sep 2001 07:59:27 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: Marcelo Tosatti <marcelo@conectiva.com.br>
Cc: Linus Torvalds <torvalds@transmeta.com>,
        Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.4.10-pre11
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In-Reply-To: <Pine.LNX.4.21.0109180111550.7152-100000@freak.distro.conectiva>; from marcelo@conectiva.com.br on Tue, Sep 18, 2001 at 01:14:36AM -0300
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On Tue, Sep 18, 2001 at 01:14:36AM -0300, Marcelo Tosatti wrote:
> Note that in 2.4 we scan pte's even if there is no free pages
> shortage, while in 2.2 we only scan pte's if there is a free page
> shortage.

That was most certainly a problem which is now fixed. Mainly the
preallication of swap was a waste. But I think there was a kind of
physical (not pte) overaging too that forbidden the vm to react
properly.

I believe when the storm of swap_out startups it won't matter any longer
what we aged and whatever pte scanning we did previously. At least with
the current swap_out.

Andrea