linux-kernel - Re: [PATCH v4 01/10] tools/perf: support parsing parameterized events

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Date:	Thu, 25 Sep 2014 10:58:58 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>, ak@...ux.intel.com,
	peterz@...radead.org, eranian@...gle.com,
	Paul Mackerras <paulus@...ba.org>, dev@...yps.com,
	Michael Ellerman <michaele@....ibm.com>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	hbabu@...ibm.com, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 01/10] tools/perf: support parsing parameterized events

On Wed, Sep 24, 2014 at 12:27:15PM -0700, Sukadev Bhattiprolu wrote:
> From: Cody P Schafer <cody@...ux.vnet.ibm.com>
> 
> Enable event specification like:
> 
> 	pmu/event_name,param1=0x1,param2=0x4/
> 
> Assuming that
> 
> 	/sys/bus/event_source/devices/pmu/events/event_name
> 
> Contains something like
> 
> 	param2=foo,bar=1,param1=baz

hum, so what happened to the '?' ... AFAIU from out last discussion,
you wanted to mark terms which are mandatory and user must provide
values for them.. and I thought the decision was to have following
alias record:

  $ cat /sys/bus/event_source/devices/pmu/events/event_name
  param2=?,bar=1,param1=?

while perf would scream if any of param1/2 wasnt filled like for:
  pmu/event_name,param1=0x1/


thanks,
jirka
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