Re: [PATCH 3/3] [UDP6]: Counter increment on BH mode

[Christoph Lameter]

On Sun, 16 Dec 2007, Herbert Xu wrote:

> If we can get the address of the per-cpu counter against
> some sort of a per-cpu base pointer, e.g., %gs on x86, then
> we can do
> 
> 	incq	%gs:(%rax)
> 
> where %rax would be the offset with %gs as the base.  This would
> obviate the need for the CPU ID and therefore avoid disabling
> preemption.
> 
> Hmm, wasn't Christoph working on something like that?

Yes that is what the cpu alloc patchset implements.

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