Re: [PATCH] perf: Fix intel shared extra msr allocation

[Peter Zijlstra]

On Tue, 2012-06-05 at 12:38 +0200, Stephane Eranian wrote:
> How about we add a field or flag to cpuc to tell it's fake, and then
> in
> try_alt_er() and __intel_shared_reg_get_constraints() we avoid
> touching
> live struct (like reg->alloc) if fake==1. I think he was trying to do
> the same with the core_id == -1 test. 

We might have to do something like that, however I'm trying to figure
out when that reg->alloc test in __intel_shared_reg_get_contraints() is
useful.

If it is useful in event scheduling, we cannot just leave it out in
validate_group().
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