netdev - Re: [PATCH v9 4/4] perf tools: add support for libpfm4

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Message-ID: <CAP-5=fVOb1nV2gdGGWLQvTApoMR=qzaSQHSwxsAKAXQ=wqQV+g@mail.gmail.com>
Date:   Thu, 16 Apr 2020 09:02:54 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...hat.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>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Igor Lubashev <ilubashe@...mai.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jiwei Sun <jiwei.sun@...driver.com>,
        yuzhoujian <yuzhoujian@...ichuxing.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.garry@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v9 4/4] perf tools: add support for libpfm4

On Thu, Apr 16, 2020 at 2:55 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Wed, Apr 15, 2020 at 11:35:51PM -0700, Ian Rogers wrote:
> > From: Stephane Eranian <eranian@...gle.com>
> >
> > This patch links perf with the libpfm4 library if it is available
> > and NO_LIBPFM4 isn't passed to the build. The libpfm4 library
> > contains hardware event tables for all processors supported by
> > perf_events. It is a helper library that helps convert from a
> > symbolic event name to the event encoding required by the
> > underlying kernel interface. This library is open-source and
> > available from: http://perfmon2.sf.net.
> >
> > With this patch, it is possible to specify full hardware events
> > by name. Hardware filters are also supported. Events must be
> > specified via the --pfm-events and not -e option. Both options
> > are active at the same time and it is possible to mix and match:
> >
> > $ perf stat --pfm-events inst_retired:any_p:c=1:i -e cycles ....
> >
> > Signed-off-by: Stephane Eranian <eranian@...gle.com>
> > Reviewed-by: Ian Rogers <irogers@...gle.com>
>
>         # perf list
>         ...
>         perf_raw pfm-events
>           r0000
>             [perf_events raw event syntax: r[0-9a-fA-F]+]
>
>         skl pfm-events
>           UNHALTED_CORE_CYCLES
>             [Count core clock cycles whenever the clock signal on the specific core is running (not halted)]
>           UNHALTED_REFERENCE_CYCLES
>
> please add ':' behind the '* pfm-events' label

Thanks! Not sure I follow here. skl here is the pmu. pfm-events is
here just to make it clearer these are --pfm-events. The event is
selected with '--pfm-events UNHALTED_CORE_CYCLES'. Will putting
skl:pfm-events here make it look like that is part of the event
encoding?

Thanks,
Ian

> jirka
>