linux-kernel - Re: [this_cpu_xx V4 02/20] this_cpu: X86 optimized this

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Message-ID: <20091002095916.GA26201@elte.hu>
Date:	Fri, 2 Oct 2009 11:59:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	cl@...ux-foundation.org
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, rusty@...tcorp.com.au,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [this_cpu_xx V4 02/20] this_cpu: X86 optimized this_cpu
	operations


* cl@...ux-foundation.org <cl@...ux-foundation.org> wrote:

> Basically the existing percpu ops can be used for this_cpu variants 
> that allow operations also on dynamically allocated percpu data. 
> However, we do not pass a reference to a percpu variable in. Instead a 
> dynamically or statically allocated percpu variable is provided.
> 
> Preempt, the non preempt and the irqsafe operations generate the same 
> code. It will always be possible to have the requires per cpu 
> atomicness in a single RMW instruction with segment override on x86.
> 
> 64 bit this_cpu operations are not supported on 32 bit.
> 
> Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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