Re: [PATCH 1/3] perf-events: Add support for supplementary eventregisters

[Andi Kleen]

On 11/11/2010 8:36 PM, Peter Zijlstra wrote:
> Can we make it so, that is, move that int inside the intel_percore
> struct?

It's needed per cpu. Basically the flag says "bother to look into the 
percore structure"
This way most of this is kept out of the fast paths. But one CPU in a core
may need it and the other not.

In principle it could be merged into some other cpuc flag word if you 
have any suggestions.

> Hrm,.. but we only need to do this on nhm/wsm init, we already have code
> detecting the cpu model. And I'm quite sure you know where to poke to
> see if HT is enabled.

Ok I guess I can do a dynamic per cpu allocation for this case.

-Andi
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