lkml.org 
[lkml]   [2011]   [Nov]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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.

--
Gleb.


\
 
 \ /
  Last update: 2011-11-07 18:19    [W:0.061 / U:0.680 seconds]
©2003-2014 Jasper Spaans. Advertise on this site