linux-kernel - Re: [PATCH 5/6] perf_counter: add more context information

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Date:	Mon, 06 Apr 2009 14:15:28 -0700
From:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] perf_counter: add more context information



Peter Zijlstra wrote:
> On Mon, 2009-04-06 at 13:16 -0700, Corey Ashford wrote:
> 
>>>> One downside of this approach is that you if you specify "no header" 
>>>> (currently not possible, but maybe later?), you will not be able to get 
>>>> the level bits.
>>> Would this be desirable? 
> 
>> I think it would.  For one use case I'm working on right now, simple 
>> profiling, all I need are ip's.  If I could omit the header, that would 
>> reduce the frequency of sigio's by a factor of three, and make it faster 
>> to read up the ip's when the SIGIO's occur.
> 
> Self-profiling?
> 
> So you're interested in getting the smallest possible record size, that
> would still be 2 u64, right? Otherwise you don't get the IP context that
> started this.
> 
> 

Self-profiling mainly, yes.  PAPI specs an ability for remote monitoring 
of processes and threads, but I think it's only partially implemented.

So when you are talking about IP context, you mean pid/tid?

Regards,

- Corey

Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
cjashfor@...ibm.com

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