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

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Message-ID: <20091004164731.GA20489@elte.hu>
Date:	Sun, 4 Oct 2009 18:47:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	cl@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	rusty@...tcorp.com.au
Subject: Re: [this_cpu_xx V4 02/20] this_cpu: X86 optimized this_cpu
	operations


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> Hi,
>
> Ingo Molnar wrote:
>> * 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>
>
> I haven't looked at the series in detail but AFAICT the SLUB patches 
> depend on the x86 ones. Any suggestions how to get all this into 
> linux-next? Should I make a topic branch in slab.git on top of -tip or 
> something?

I'd suggest to keep these patches together in the right topical tree: 
Tejun's percpu tree. Any problem with that approach?

	Ingo
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