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

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Date:   Tue, 15 Dec 2020 13:03:32 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH 2/3] perf tools: Allow to enable/disable events via
 control file

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