Re: [PATCH 20/41] perf tools: Let a user specify a PMU event without any config terms

[Adrian Hunter]

On 16/07/2014 9:22 p.m., Jiri Olsa wrote:
> On Wed, Jul 16, 2014 at 06:04:44PM +0300, Adrian Hunter wrote:
> > On 16/07/2014 5:25 p.m., Jiri Olsa wrote:
> > > On Mon, Jul 14, 2014 at 01:02:44PM +0300, Adrian Hunter wrote:
> > > > This enables a PMU event to be specified in the form:
> > > >
> > > > 	pmu//
> > > >
> > > > which is effectively the same as:
> > > >
> > > > 	pmu/config=0/
> > > >
> > > > This patch is a precursor to defining
> > > > default config for a PMU.
> > >
> > > I understand the need for default config, but could you please elaborate
> > > why do we want to parse 'pmu//' as an event string string?
> >
> > Currently the parser requires the slashes to identify a PMU event
> > as opposed to a hardware or other kind of event.
>
> right, so why do we want to parse 'pmu//' as an event string? ;-)

I am not sure what you mean.  Here I am using 'pmu' as a placeholder
for a real PMU name.  So actual event strings are 'intel_bts//' or
'intel_pt//' or 'intel_pt/tsc=0,noretcomp=1/'

The parser uses various tricks to decide what kind of event the event
name actually is e.g. colons indicate a tracepoint.

If you are asking why the parser isn't smart enough to know the event
name is a PMU name, I guess it is either to keep the namespaces separate,
or because it was easier to program it that way.
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