Messages in this thread | | | Date | Mon, 25 Mar 2019 08:58:27 -0700 | From | Andi Kleen <> | Subject | Re: [RFC] [PATCH v2 0/5] Intel Virtual PMU Optimization |
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> It isn't going anywhere anyway, its insane. You let perf do all its > normal things and then discard the results by avoiding the wrmsr. > > Then you fudge a second wrmsr path somewhere. > > Please, just make the existing event dtrt.
I still think the right way is to force an event to a counter from an internal field. And then set that field from KVM. This is quite straight forward to do in the event scheduler.
I did it for some experimential PEBS virtualization patches which require the same because they have to expose the counter indexes inside the PEBS record to the guest.
-Andi
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