linux-kernel - Re: [QUICKLIST 1/5] Quicklists for page table pages V4

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Message-ID: <Pine.LNX.4.64.0703222339560.19630@schroedinger.engr.sgi.com>
Date:	Thu, 22 Mar 2007 23:52:05 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 1/5] Quicklists for page table pages V4

On Thu, 22 Mar 2007, Andrew Morton wrote:

> On Thu, 22 Mar 2007 23:28:41 -0700 (PDT) Christoph Lameter <clameter@....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?

About 40% on fork+exit. See 

http://marc.info/?l=linux-ia64&m=110942798406005&w=2

 
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