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

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Message-ID: <20141001090627.GB5168@krava.brq.redhat.com>
Date:	Wed, 1 Oct 2014 11:06:27 +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, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 01/10] tools/perf: support parsing parameterized events

On Thu, Sep 25, 2014 at 07:25:20PM -0700, Sukadev Bhattiprolu wrote:
> Jiri Olsa [jolsa@...hat.com] wrote:
> | 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/
> 
> Sorry, I meant to make perf list consistent with sysfs.
> 
> Consider these two sysfs entries:
> 
> 	$ cat HPM_0THRD_NON_IDLE_CCYC__PHYS_CORE 
> 	domain=0x2,offset=0xe0,starting_index=core,lpar=0x0
> 
> 	$ cat HPM_0THRD_NON_IDLE_CCYC__VCPU_HOME_CORE 
> 	domain=0x3,offset=0xe0,starting_index=vcpu,lpar=sibling_guest_id
> 
> In the first one, starting_index refers to a 'core' while in the second
> it refers to a vcpu. This serves as a "hint" for the parameter's meaning.
> 
> By replacing both with 'starting_index=?' we lose that hint.
> 
> Should we fix both sysfs and 'perf list' to say
> 
> 	starting_index=?core 

Peter, Ingo,
any opinions on this? Overall explanation is in here:
http://marc.info/?l=linux-kernel&m=141158688307356&w=2

thanks,
jirka
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