Messages in this thread | | | Subject | Re: [PATCH 3/3] perf, tools: Add support for guest/host-only profiling | From | Peter Zijlstra <> | Date | Tue, 10 May 2011 18:09:46 +0200 |
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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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