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Date: Thu, 22 Mar 2007 22:39:27 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [QUICKLIST 1/5] Quicklists for page table pages V4
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On Thu, 22 Mar 2007 23:28:41 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:

> 1. Proven code from the IA64 arch.
> 
> 	The method used here has been fine tuned for years and
> 	is NUMA aware. It is based on the knowledge that accesses
> 	to page table pages are sparse in nature. Taking a page
> 	off the freelists instead of allocating a zeroed pages
> 	allows a reduction of number of cachelines touched
> 	in addition to getting rid of the slab overhead. So
> 	performance improves.

By how much?