linux-kernel - Re: [PATCH 4/4] perf expr: Report line number with error

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Date:   Wed, 13 May 2020 11:08:25 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.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>,
        Joe Mario <jmario@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH 4/4] perf expr: Report line number with error

Em Wed, May 13, 2020 at 01:34:24PM +0200, Jiri Olsa escreveu:
> On Wed, May 13, 2020 at 12:09:30AM -0700, Ian Rogers wrote:
> > On Mon, May 11, 2020 at 1:54 PM Jiri Olsa <jolsa@...nel.org> wrote:
> > >
> > > Display line number on when parsing custom metrics file, like:
> > >
> > >   $ cat metrics
> > >   // IPC
> > >   mine1 = inst_retired.any / cpu_clk_unhalted.thread;
> > >
> > >   krava
> > >   $ sudo perf stat --metrics-file ./metrics -M mine1 -a -I 1000 --metric-only
> > >   failed to parse metrics file: ./metrics:4
> > >
> > > Please note that because the grammar is flexible on new lines,
> > > the syntax could be broken on the next 'not fitting' item and
> > > not the first wrong word, like:
> > >
> > >   $ cat metrics
> > >   // IPC
> > >   krava
> > >   mine1 = inst_retired.any / cpu_clk_unhalted.thread;
> > >   $ sudo perf stat --metrics-file ./metrics -M mine1 -a -I 1000 --metric-only
> > >   failed to parse metrics file: ./metrics:3
> > 
> > A line number is better than nothing :-) It'd be nice to be told about
> > broken events and more information about what's broken in the line. A
> > common failure is @ vs / encoding and also no-use or misuse of \\.
> > Perhaps expand the test coverage.
> 
> yep, error reporting needs more changes.. but the line is crucial ;-)

So I had started processing this patchkit, I assume you will send a v2
and I should drop what I had processed, is that ok?

- Arnaldo