also Cc Frederic, On Tue, 9 Jul 2019 at 10:00, Ankur Arora <ankur.a.arora@xxxxxxxxxx> wrote: > > On 2019-06-26 12:23 p.m., Thomas Gleixner wrote: > > On Wed, 26 Jun 2019, Raslan, KarimAllah wrote: > >> On Wed, 2019-06-26 at 10:54 -0400, Konrad Rzeszutek Wilk wrote: > >>> There were some ideas that Ankur (CC-ed) mentioned to me of using the perf > >>> counters (in the host) to sample the guest and construct a better > >>> accounting idea of what the guest does. That way the dashboard > >>> from the host would not show 100% CPU utilization. > >> > >> You can either use the UNHALTED cycles perf-counter or you can use MPERF/APERF > >> MSRs for that. (sorry I got distracted and forgot to send the patch) > > > > Sure, but then you conflict with the other people who fight tooth and nail > > over every single performance counter. > How about using Intel PT PwrEvt extensions? This should allow us to > precisely track idle residency via just MWAIT and TSC packets. Should > be pretty cheap too. It's post Cascade Lake though. > > Ankur > > > > > Thanks, > > > > tglx > > >
