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Date: Mon, 18 Jan 2010 17:22:12 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>, linux-kernel@vger.kernel.org,
       mingo@elte.hu, paulus@samba.org, davem@davemloft.net,
       perfmon2-devel@lists.sf.net, eranian@gmail.com
Subject: Re: [PATCH]  perf_events: improve x86 event scheduling (v5)
Message-ID: <20100118162209.GH10364@nowhere>
References: <4b5430c6.0f975e0a.1bf9.ffff85fe@mx.google.com> <20100118134324.GB10364@nowhere> <1263822898.4283.558.camel@laptop> <20100118142004.GD10364@nowhere> <1263825421.4283.597.camel@laptop> <20100118145346.GF10364@nowhere> <1263826798.4283.606.camel@laptop>
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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.