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

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Message-ID: <20201215162700.GP258566@kernel.org>
Date:   Tue, 15 Dec 2020 13:27:00 -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 05:18:38PM +0100, Jiri Olsa escreveu:
> On Tue, Dec 15, 2020 at 01:03:32PM -0300, Arnaldo Carvalho de Melo wrote:
> > 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?
 
> right, that's we discussed in the other patch thread,
> I'll make the change

This is a new way to control perf, its important that we try to reuse
the same concepts as in the pre-existing forms of interaction, so as to
reduce the learning curve for using this control mode.

I.e. this 'enable' should be as equivalent to the -e argument as
possible, for what makes sense for a pre-existing, already configured
event.

For _adding_ new ones, that we probably will want next, then its even
more important to reuse the same -e parser :-)

Thanks!

- Arnaldo