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    SubjectRe: [PATCHv2 2/9] KVM: Expose a version 2 architectural PMU to a guests
    On Mon, Nov 07, 2011 at 05:45:14PM +0100, Peter Zijlstra wrote:
    > On Mon, 2011-11-07 at 17:25 +0200, Gleb Natapov wrote:
    > > > Since the below programming doesn't use perf_event_attr::pinned, yes.
    > > >
    > > Yes, that is on todo :). Actually I do want to place all guest perf
    > > counters into the same event group and make it pinned. But currently perf
    > > event groups are not very flexible. In our usage scenario we can't have
    > > one event as a group leader since events are created and destroyed very
    > > dynamically. What I would like is to have something like meta event that
    > > will group all other real event.
    > Is there a reason to have them grouped if you pin them all anyway?
    Hmm good question. May be we shouldn't pin then since this will prevent
    profiling vcpu task on a host while perf is running in a guest, but then
    we need to group guest created event to get meaningful result. I think I'll
    pin them for now and will look into grouping them later.


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