linux-kernel - Re: [PATCH 07/10] perf, tool: Add support to specify hw event as pmu event term

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Message-ID: <20120704120001.GC960@krava.redhat.com>
Date:	Wed, 4 Jul 2012 14:00:01 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	acme@...hat.com, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	eranian@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] perf, tool: Add support to specify hw event as pmu
 event term

On Wed, Jul 04, 2012 at 12:39:20PM +0200, Peter Zijlstra wrote:
> On Wed, 2012-07-04 at 00:00 +0200, Jiri Olsa wrote:
> > 
> > It's possible to use sysfs attribute name as 'event' term value,
> > or any possible alias for hw event, e.g.:
> >   cycles                     OR cpu-cycles
> >   branch_misses              OR branch-misses
> >   bus_cycles                 OR bus-cycles
> >   cache_misses               OR cache-misses
> >   cache_references           OR cache-references
> >   ref_cycles                 OR ref-cycles
> >   stalled_cycles_backend     OR stalled-cycles-backend
> >   stalled_cycles_frontend    OR stalled-cycles-frontend 
> 
> Do we really want to do that?

well, the aliasing works on sysfs filename base.. so when you specify
   event=str 

'str' file is looked up in 'events' dir.

We use '_' in file names and '-' in event symbol names. I thought it might be
confusing allowing just '_' so I added also the '-' version.

I could keep just the '-' version.. with some more work on kernel ATTR
function names ;) but it seems like common sysfs practise to use '_'.

jirka
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