Subject: Re: [RFC] perf_events: support for uncore a.k.a. nest units
From: Peter Zijlstra <peterz@infradead.org>
To: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
       Andi Kleen <andi@firstfloor.org>, Paul Mackerras <paulus@samba.org>,
       Stephane Eranian <eranian@googlemail.com>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
       Dan Terpstra <terpstra@eecs.utk.edu>, Philip Mucci <mucci@eecs.utk.edu>,
       Maynard Johnson <mpjohn@us.ibm.com>, Carl Love <cel@us.ibm.com>,
       Steven Rostedt <rostedt@goodmis.org>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Masami Hiramatsu <mhiramat@redhat.com>
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Date: Sat, 30 Jan 2010 09:42:59 +0100
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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.


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