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Subject: Re: [RFC PATCHv3] perf tools: add event grouping capability to
 "perf stat"
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
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        Tom Zanussi <tzanussi@gmail.com>, linux-kernel@vger.kernel.org,
        Matt Fleming <matt@console-pimps.org>
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Date: Thu, 25 Nov 2010 09:00:09 +0100
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On Thu, 2010-11-25 at 08:46 +0100, Frederic Weisbecker wrote:
> > perf record -e task-clock:freq=1000,cycles:period=0
> 
> Wouldn't this syntax clash with the flags we have on events already?
> 
> the u,k,p flags? 

>>From stephane's email (to which you were CC'ed) http://lkml.org/lkml/2010/11/23/303

> $ perf record -e cycles:u:period=100000,instructions:k:freq=1500 -a -- sleep 5

The parser isn't particularly pretty, maybe its time to think about a parser generator?