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

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Date:	Mon, 01 Feb 2010 11:39:26 -0800
From:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	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>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [RFC] perf_events: support for uncore a.k.a. nest units



On 1/30/2010 12:42 AM, Peter Zijlstra wrote:
> On Fri, 2010-01-29 at 15:05 -0800, Corey Ashford wrote:
>> So you'd read the id from the sysfs topology tree, and then pass that id to the
>> interface?  That's an interesting approach that eliminates the need to pass a
>> string pmu path to the kernel.
>
> No, the attr.pmu_id would reflect the location in the tree (pci
> location, or spu number), the pmu id reported would identify the kind of
> pmu driver used for that particular device.
>
> I realized this confusion after sending but didn't clarify, we should
> come up with a good alternative name for either (or both) uses.
>

Ok, just so I'm clear here, is attr.pmu_id a (char *) or some sort of encoded 
bit field?

- Corey

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