Re: [patch] Performance Counters for Linux, v2

[Ingo Molnar]

* stephane eranian <eranian@xxxxxxxxxxxxxx> wrote:

> > There's also more generic x86 support: all 4 generic PMCs of Nehalem 
> > / Core i7 are supported - i've run 4 instances of KernelTop and they 
> > used up four separate PMCs.
>
> Core/Atom have 5 counters, Nehalem has 7. Why are you not using all of 
> them already?

no, Nehalem has 4 generic purpose PMCs and 3 fixed-purpose PMCs (7 
total), Core/Atom has 2 generic PMCs and 3 fixed-purpose PMCs (5 total). 
Saying that it has 7 is misleading. (and even the generic PMCs have 
constraints)

	Ingo
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