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

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Message-ID: <4AC5C572.9040309@kernel.org>
Date:	Fri, 02 Oct 2009 18:18:42 +0900
From:	Tejun Heo <tj@...nel.org>
To:	cl@...ux-foundation.org
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, 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 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: Tejun Heo <tj@...nel.org>

-- 
tejun
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