Re: What is the difference between percpu_xxx and this_cpu_xxx?

[Eric Dumazet]

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)



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