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

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Message-ID: <20200513113424.GJ3158213@krava>
Date:   Wed, 13 May 2020 13:34:24 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...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

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 ;-)

jirka