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Date: Mon, 9 Apr 2007 10:16:06 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: William Lee Irwin III <wli@holomorphy.com>
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       linux-mm@kvack.org, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 1/4] x86_64: (SPARSE_VIRTUAL doubles sparsemem speed)
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On Mon, 9 Apr 2007, William Lee Irwin III wrote:

> Whatever's going on with the rest of this, I really like this
> instrumentation patch. It may be worthwhile to allow pc_start() to be
> overridden so things like performance counter MSR's are usable, but
> the framework looks very useful.

Yeah. I also did some measurements on quicklists on x86_64 and it seems 
that caching page table pages is also useful:

no quicklist

pte_alloc               1569048 4.3s(401ns/2.7us/179.7us)
pmd_alloc                780988 2.1s(337ns/2.7us/86.1us)
pud_alloc                780072 2.2s(424ns/2.8us/300.6us)
pgd_alloc                260022 1s(920ns/4us/263.1us)

quicklist:

pte_alloc                452436 573.4ms(8ns/1.3us/121.1us)
pmd_alloc                196204 174.5ms(7ns/889ns/46.1us)
pud_alloc                195688 172.4ms(7ns/881ns/151.3us)
pgd_alloc                 65228 9.8ms(8ns/150ns/6.1us)