Re: [PATCH 1/3] perf, core: Introduce attrs to count in either hostor guest mode

[Roedel, Joerg]

On Tue, May 10, 2011 at 10:45:46AM -0400, Peter Zijlstra wrote:
> On Tue, 2011-05-10 at 16:35 +0200, Joerg Roedel wrote:
> > +       /* Can't exclude counting in guest and in host mode */
> > +       if (attr.exclude_host && attr.exclude_guest)
> > +               return -EINVAL;
> 
> Why not?

By definition the counter won't count at all. The hardware just ignores
the bits if they are both set. My rationale here was that it does not
makes sense to setup a counter and exclude guest and host mode.

	Joerg


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