linux-kernel - Re: re-enable Nehalem raw Offcore-Events support

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Date:	Mon, 02 May 2011 11:32:08 -0700
From:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...ux.intel.com>,
	Pekka Enberg <penberg@...nel.org>,
	Vince Weaver <vweaver1@...s.utk.edu>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...il.com>,
	Carl Love <carll@...ibm.com>
Subject: Re: re-enable Nehalem raw Offcore-Events support

On 05/01/2011 10:55 AM, Ingo Molnar wrote:
> 
> * Corey Ashford <cjashfor@...ux.vnet.ibm.com> wrote:
> 
>> Carl Love and I recently completed some work to add perf_events support for 
>> the IBM Blue Waters machine's "CPU networking" chip, called the Torrent chip.  
>> We did all of this work based on a RHEL 6 kernel (2.6.32ish), which doesn't 
>> have Peter's more recent multi-PMU support.
>>
>> I would say that most if not all of the events are not generalizable in the 
>> sense that you are talking about; the events are very specific to the Torrent 
>> chip. [...]
> 
> That's ok and not a problem.
> 
> The issue here are events that *are* generalizable.
> 
>> So if I'm understanding what you have said correctly, we would not be able to 
>> get a forward port of this code committed without abstracting these events in 
>> a away that's acceptable to the kernel community. [...]
> 
> If the number of events worth generalizing is the empty set that's ok.
> 
> Thanks,
> 
> 	Ingo

Great, that's good to hear.

Thanks,

- Corey
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