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

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Message-Id: <20071101.142551.93114462.davem@davemloft.net>
Date:	Thu, 01 Nov 2007 14:25:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	clameter@....com
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

From: Christoph Lameter <clameter@....com>
Date: Thu, 1 Nov 2007 06:01:14 -0700 (PDT)

> 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)))

Oh I see, it's the offset itself which is accessed at the fixed
virtual address slot.
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