Re: What is the difference between percpu_xxx and this_cpu_xxx?

[Huang Ying]

Hi, Eric,

On 09/13/2011 02:11 PM, Eric Dumazet wrote:
> Le mardi 13 septembre 2011 Ã 12:28 +0800, Huang Ying a Ãcrit :
>> Hi,
>>
>> If my understanding was correct, from the kernel source code, it appears
>> that percpu_xxx and this_cpu_xxx have the same semantics and
>> implementation in effect, havenât them?
>>
>> If so, why do we need two API for the same thing?
> 
> History mostly, and transition.
> 
> percpu_inc() was an x86 only thing
> 
> __get_cpu_var(var)++ -> percpu_inc(var) -> this_cpu_inc(var)

Thanks for clarification.  Is there someone working on the transition?
Is that possible to translate most percpu_xxx to this_cpu_xxx blindly?

Best Regards,
Huang Ying
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