linux-kernel - Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead

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Message-ID: <Pine.LNX.4.64.0711010559300.27666@schroedinger.engr.sgi.com>
Date:	Thu, 1 Nov 2007 06:01:14 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Miller <davem@...emloft.net>
cc:	dada1@...mosbay.com, akpm@...ux-foundation.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	mathieu.desnoyers@...ymtl.ca, penberg@...helsinki.fi
Subject: Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu
 access overhead

On Thu, 1 Nov 2007, David Miller wrote:

> IA64 seems to use it universally for every __get_cpu_var()
> access, so maybe it works out somehow :-)))

IA64 does not do that. It addds the local cpu offset

#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, 
__ia64_per_cpu_var(local_per_cpu_offset)))
#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, 
__ia64_per_cpu_var(local_per_cpu_offset)))


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