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Date: Sat, 03 Mar 2007 20:26:15 -0500
From: Rik van Riel <riel@redhat.com>
Organization: Red Hat, Inc
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To: Nick Piggin <npiggin@suse.de>
CC: Christoph Lameter <clameter@engr.sgi.com>,
       Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mel@skynet.ie>,
       mingo@elte.hu, jschopp@austin.ibm.com, arjan@infradead.org,
       torvalds@linux-foundation.org, mbligh@mbligh.org, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches
References: <20070302050625.GD15867@wotan.suse.de> <Pine.LNX.4.64.0703012137580.1768@schroedinger.engr.sgi.com> <20070302054944.GE15867@wotan.suse.de> <Pine.LNX.4.64.0703012150290.1768@schroedinger.engr.sgi.com> <20070302060831.GF15867@wotan.suse.de> <Pine.LNX.4.64.0703012213130.1917@schroedinger.engr.sgi.com> <20070302062950.GG15867@wotan.suse.de> <Pine.LNX.4.64.0703012236160.1979@schroedinger.engr.sgi.com> <20070302071955.GA5557@wotan.suse.de> <Pine.LNX.4.64.0703012335250.13224@schroedinger.engr.sgi.com> <20070302081210.GD5557@wotan.suse.de>
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Nick Piggin wrote:

> Different issue, isn't it? Rik wants to be smarter in figuring out which
> pages to throw away. More work per page == worse for you.

Being smarter about figuring out which pages to evict does
not equate to spending more work.  One big component is
sorting the pages beforehand, so we do not end up scanning
through (and randomizing the LRU order of) anonymous pages
when we do not want to, or cannot, evict them anyway.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.