Re: [PATCH 2/3] perf tools: Allow to enable/disable events via control file

[Arnaldo Carvalho de Melo]

Em Tue, Dec 15, 2020 at 04:24:20PM +0100, Jiri Olsa escreveu:
> On Tue, Dec 15, 2020 at 12:14:13PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Dec 10, 2020 at 09:43:29PM +0100, Jiri Olsa escreveu:
> > > Adding new control events to enable/disable specific event.
> > > The interface string for control file are:
> > > 
> > >   'enable-<EVENT NAME>'
> > >   'disable-<EVENT NAME>'
> > 
> > Wwy do we have "enable-" as the "tag" for this?
> 
> the whole 'enable-' is prefix for command that enables specific event
> following '-' starts the event name
> 
> > 
> > Also is it possible to use "enable sched:*" and have that match what is
> > in the evlist and enable (or disable, if using "disable sched:*") what
> > matches?
> 
> yep, that should be possible to add
> 
> > 
> > This second suggestion can be done on top of this, i.e. as an
> > enhancement, but mixing up the command (enable, disable) with its
> > arguments looks strange.
> 
> the '-' determines that there's event name following,
> pure 'enable' switches on everything

I see it, but why not use the more natural ' ' space to separate the
command from its arguments? Just like in a bash command line, say?

I.e. why not:

  enable

to enable everything, and:

  enable sched:sched_switch

To enable just the "sched:sched_switch" event?

- Arnaldo