linux-kernel - Re: [RFC 00/10] perf tools: Add support to reuse metric

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Message-ID: <20200627124821.GF29008@kernel.org>
Date:   Sat, 27 Jun 2020 09:48:21 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 00/10] perf tools: Add support to reuse metric

Em Fri, Jun 26, 2020 at 02:57:59PM -0700, Andi Kleen escreveu:
> > The name could be a metric or an event, the logic for each is quite
> 
> I would say collisions are unlikely. Event names follow quite structured
> patterns.

And when introducing a new metric the build process can detect that
clash and fail.
 
> > different. You could look up an event and when it fails assume it was
> > a metric, but I like the simplicity of this approach.
 
> I don't think it's simpler for the user.

Agreed.
 
> > Maybe this
> > change could be adopted more widely with something like "perf stat -e
> > metric:IPC -a -I 1000" rather than the current "perf stat -M IPC -a -I
> > 1000".
> 
> I thought about just adding metrics to -e, without metric: of course.

Ditto.

- Arnaldo