Hello Will, On Mon, Oct 29, 2007 at 01:53:50PM -0400, William Cohen wrote: > Hi, > > In one of the perfmon2 presentations there is mention "Usage models in > virtual environments" in the current challenges: > > http://cscads.rice.edu/workshops/july2007/perf-slides-07/Eranian-Perfmon.pdf > > Are there more details on the status/plan of perfmon2 in the presence of > virtualized hardware? > As outlined in my OLS2007 presentation, I have done some prototyping work with KVM and VT-x to gauge the level of difficulty. As expected, there were several issues. We need to work on resolving those issues at the software and hardware levels. This work was just looking at KVM, I bet, similar issues exist with Xen.
Do you agree about the usefulness of the *two* usage models I outline in the presentation? Today, using something like XenOprofile or just plain Oprofile with KVM you get the system-wide view but not the PMU virtualizationr. Thus virtualized guests cannot expose the PMU to guest applications. I think that's bad. -- -Stephane _______________________________________________ perfmon mailing list [email protected] http://www.hpl.hp.com/hosted/linux/mail-archives/perfmon/
