Re: [RFC] Convert pgtable cache to slab

From: William Lee Irwin III <>
Date: 2004-10-14 04:59:56
On Wed, Oct 13, 2004 at 02:47:43PM -0400, Martin K. Petersen wrote:
> This patch makes the page table cache on IA-64 use the slab instead of
> standard page allocations.  It's based upon Bill Irwin's code for
> ppc64.
> With this patch I got a significant improvement in page fault time.
> Standard 2.4.x was about 700ns on average.  Generic 2.6.9rc4 is 3-4
> usec, whereas the slabified pgtcache drops us back down to 600-700 ns.
> Tested on zx1 and sn2.
> The biggest caveat is that I've had to postpone setting up the gate
> page until the pgt slab has been initialized.  That wasn't an issue
> with the existing page-based allocation scheme.  David - how do you
> prefer I handle this?

Nice! I got reports that it would not be beneficial when I thought
about going over this earlier. I suppose it's a small vindication
of my methods to see the original objection contradicted here. =)

-- wli
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Received on Wed Oct 13 15:00:57 2004

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