Re: [PATCH 6/8] perf: Account freq events per cpu

[Frederic Weisbecker]

On Thu, Aug 01, 2013 at 04:03:52PM +0200, Peter Zijlstra wrote:
> On Thu, Aug 01, 2013 at 03:55:27PM +0200, Frederic Weisbecker wrote:
> > On Thu, Aug 01, 2013 at 03:31:55PM +0200, Peter Zijlstra wrote:
> > > 
> > > Where the freq thing is new and shiney, but we already had the other
> > > two. Of those, cgroup events must be per cpu so that should be good,
> > > the branch_stack thing tests ATTACH_TASK, which should also be good, but
> > > leaves me wonder wth they do for those that are attached to tasks.
> > > 
> > > But yes, the frequency thing is borken.
> > 
> > Aie, so the freq thing,  I can either account to all CPUs (inc to all
> > and send an IPI to all), or when the event scheds in/out. Probably we
> > should do the former to avoid sending an IPI at all context switches.
> 
> Yeah, just go with a single global state for now..

A single global counter? Ok sounds good.
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