linux-kernel - Re: [RFC] perf_events: support for uncore a.k.a. nest units

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Date:	Thu, 21 Jan 2010 09:36:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...glemail.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	Philip Mucci <mucci@...s.utk.edu>,
	Maynard Johnson <mpjohn@...ibm.com>, Carl Love <cel@...ibm.com>
Subject: Re: [RFC] perf_events: support for uncore a.k.a. nest units

On Wed, 2010-01-20 at 15:23 -0800, Corey Ashford wrote:
> If so, that's an interesting idea, but I think it still 
> leaves open the problem of how to actually relate those address to the real 
> hardware, especially in the case of using a hypervisor which has provided you a 
> small subset of the physical hardware in the system. 

Well, I'm tempted to say that's a problem for the virt guys :-)

One way one could solve that is by having the topology information
include the virt<->phys map, so that you can find the physical node from
the virtual cpu number.

Going to be interesting though, but then, virt seems to be about
creating problems where there were none before.

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