Re: [PATCH] perf_events: improve x86 event scheduling (v5)

From: Frederic Weisbecker
Date: Mon Jan 18 2010 - 11:22:22 EST

On Mon, Jan 18, 2010 at 03:59:58PM +0100, Peter Zijlstra wrote:
> On Mon, 2010-01-18 at 15:53 +0100, Frederic Weisbecker wrote:
> > Not sure what you both mean by this core VS uncore thing :)
> > Is it about hardware counters that apply to single hardware threads
> > or shared among them inside a same core?
> Yeah intel has two PMUs, one per logical cpu and one per socket/node. We
> currently don't support the node one yet.
> So the thing with these socket wide things is is that they are not able
> to tell where the event originated, so relating that back to a task is
> only possible when there's only one task running.

Ah ok.

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