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

From: Peter Zijlstra
Date: Mon Jan 18 2010 - 10:00:21 EST

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.

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