Re: [PATCH 3/3] perf, tools: Add support for guest/host-onlyprofiling

[Peter Zijlstra]

On Tue, 2011-05-10 at 17:46 +0200, Roedel, Joerg wrote:
> 
> I intended to re-use the exlude_hv bit originally, but then I looked
> into how this bit is used. On PPC it looks like this bit is set when
> Linux itself runs as a guest to exclude the hypervisor code being
> profiled. The meaning here is different (beacause Linux itself is the
> hypervisor) and I wanted to avoid different semantics for this bit
> across architectures. So I introduces seperate bits.
> The exclude_hv bit can be used when we have some kind of perf-ctr
> support for KVM guests. 

Ah, I didn't mean it like that, yes HV is strictly something different
(and you understood its purpose well, its when the 'host' is a guest
itself). What I was wondering about is if we want HV to be included in
the Guest/Host exclusion mask or not.

Then again, I guess that'll change behaviour in non-obvious ways, so
better not do that.

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