linux-kernel - Re: [cpuops cmpxchg V2 3/5] irq_work: Use per cpu atomics instead of regular atomics

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Message-ID: <4D08EE11.3050603@zytor.com>
Date:	Wed, 15 Dec 2010 08:34:25 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Christoph Lameter <cl@...ux.com>, akpm@...ux-foundation.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [cpuops cmpxchg V2 3/5] irq_work: Use per cpu atomics instead
 of regular atomics

On 12/15/2010 08:32 AM, Tejun Heo wrote:
> On 12/14/2010 05:28 PM, Christoph Lameter wrote:
>> The irq work queue is a per cpu object and it is sufficient for
>> synchronization if per cpu atomics are used. Doing so simplifies
>> the code and reduces the overhead of the code.
>>
>> Before:
>>
>> christoph@...ux-2.6$ size kernel/irq_work.o
>>    text	   data	    bss	    dec	    hex	filename
>>     451	      8	      1	    460	    1cc	kernel/irq_work.o
>>
>> After:
>>
>> christoph@...ux-2.6$ size kernel/irq_work.o 
>>    text	   data	    bss	    dec	    hex	filename
>>     438	      8	      1	    447	    1bf	kernel/irq_work.o
>>
>> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> 
> Peter, can you please ack this one?
> 
> Thanks.
> 

Acked-by: H. Peter Anvin <hpa@...or.com>

... for tis whole series.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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