Hi, It looks like several of us have been looking at how to use the PMU for virtualization. Rather than continuing to have discussions in smaller groups, I think it is a good idea we move it to the mailing lists to see what we can share and avoid duplicate efforts. There are really two separate things to handle: 1) Add support to perf to allow it to monitor a KVM guest from the host. 2) Allow guests access to the PMU (or an emulated PMU), making it possible to run perf on applications running within the guest. I know some of you have been looking at 1) and I am currently working on 2). I have been looking at various approaches, including whether it is feasible to share the PMU between the host and multiple guests. For now I am going to focus on allowing one guest to take control of the PMU, then later hopefully adding support for multiplexing it between multiple guests. Eventually we will see proper hardware PMU virtualization from Intel and AMD (admittedly I have only looked at the Intel specs so far), and by then be able to allow the host as well as the guests to share the PMU. If anybody else is working on this, I'd love to hear about it so we can coordinate our efforts. The main purpose with this mail was really to being the discussion to the mailing list to avoid duplicated efforts. Cheers, Jes PS: I'll be AFK all of next week, so it may take a few days for me to reply to follow-up discussions. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
