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

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Date:	Wed, 10 Sep 2008 10:08:07 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	hamid.jahanjou@...il.com
Cc:	"Rik van Riel" <riel@...hat.com>, "Zan Lynx" <zlynx@....org>,
	"Andi Kleen" <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] VM: Implements the swap-out page-clustering technique

On Wed, Sep 10, 2008 at 1:16 AM, Hamid R. Jahanjou
<hamid.jahanjou@...il.com> wrote:
> I agree. As you said, we have two conflicting requirements here: on the
> one hand one likes to swap as many pages as to satisfy the backing
> storage "proper block IO size," on the other hand, one should not make a
> process lose too many pages.

I'd much rather that one process lose a lot of pages than many
processes lose a few. When a system is swap thrashing, each process
has some of its active working set tossed to swap, which means *any*
application you try to switch to is then sluggish. If it were only one
application, then only that one takes the penalty hit when the user
switches focus and context.
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