linux-kernel - Re: [PATCH v3 12/12] perf test: improve pmu event metric testing

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Message-ID: <CAP-5=fUA3UDNdreJBhdLBPgyFUutN_qUqaL-Diu3yihSDc_niw@mail.gmail.com>
Date:   Thu, 30 Apr 2020 07:31:29 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     John Garry <john.garry@...wei.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Haiyan Song <haiyanx.song@...el.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Paul Clarke <pc@...ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kajoljain <kjain@...ux.ibm.com>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3 12/12] perf test: improve pmu event metric testing

On Thu, Apr 30, 2020 at 4:44 AM John Garry <john.garry@...wei.com> wrote:
>
> On 30/04/2020 08:51, Ian Rogers wrote:
> > Add a basic floating point number test to expr.
> > Break pmu-events test into 2 and add a test to verify that all pmu metric
> > expressions simply parse.
>
> Could we add also add something in jevents to ensure this?

I think it is an interesting possibility. Instead of strings we could
also parse the metrics into C functions, that could cause build time
errors at least for the simple expressions. An issue I've faced is
that if jevents fails, such as a json parse error, it has an exit code
of 0 and creates an empty map file. This allows the build to proceed
but with the pmu-events functionality broken. I'd prefer a build to
fail as early as possible.

Thanks,
Ian

> Thanks,
> John
>
>   Try to parse all metric ids/events, failing if
> > metrics for the current architecture fail to parse.
> >