Re: [RFC, patch] i386: vgetcpu(), take 2

[Ingo Molnar]

* Andi Kleen <ak@xxxxxxx> wrote:

> Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx> writes:
> 
> > Use a GDT entry's limit field to store per-cpu data for fast access 
> > from userspace, and provide a vsyscall to access the current CPU 
> > number stored there.
> 
> Just the CPU alone is useless - you want at least the node too in many 
> cases. Best you use the prototype I proposed earlier for x86-64.

just the CPU is fine already in many cases [and the node ID derives from 
the linear CPU id anyway] - but i agree that in the API we want to 
include the node-ID too, for NUMA-aware userspace allocators, etc.

	Ingo
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