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

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Date:	Wed, 04 Jul 2012 14:13:39 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jiri Olsa <jolsa@...hat.com>
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, 2012-07-04 at 14:00 +0200, Jiri Olsa wrote:
> 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.

Right..

> 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 '_'.

We could map '-' to '_', but I'm not sure about the aliases in general.
I mean if the sysfs event name is 'cycles' also allowing 'cpu_cycles' is
somewhat confusing and arbitrary.

I think it would be best to stick to discoverable names only. Anybody?


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