From: Andi Kleen <ak@suse.de>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Subject: Re: [patch 1/14] mm: opt rmqueue
Date: Mon, 7 Nov 2005 04:23:44 +0100
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On Monday 07 November 2005 02:06, Nick Piggin wrote:

> Yes, all this turning on and off of interrupts does have a
> significant cost here.

How did you find out? 

>
> With the full patchset applied, most of the hot path statistics
> get put under areas that already require interrupts to be off,
> however there are still a few I didn't get around to doing.
> zone_statistics on CONFIG_NUMA, for example.

These should just be local_t 

>
> I wonder if local_t is still good on architectures like ppc64
> where it still requires an ll/sc sequence?

The current default fallback local_t doesn't require that. It uses
different fields indexed by !!in_interrupt()

-Andi
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