netdev - Re: [PATCH v5] perf tools: add support for libpfm4

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Message-ID: <CAP-5=fX346zwohXP_xgoZHyq4JSbV8hdLPvBR3ZpS_iOHcX1hA@mail.gmail.com>
Date:   Mon, 6 Apr 2020 23:43:29 -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 v5] perf tools: add support for libpfm4

On Tue, Mar 24, 2020 at 3:28 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Mon, Mar 23, 2020 at 04:58:46PM -0700, Ian Rogers wrote:
> > 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 ....
> >
> > v5 is a rebase.
> > v4 is a rebase on git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
> >    branch perf/core and re-adds the tools/build/feature/test-libpfm4.c
> >    missed in v3.
> > v3 is against acme/perf/core and removes a diagnostic warning.
> > v2 of this patch makes the --pfm-events man page documentation
> > conditional on libpfm4 behing configured. It tidies some of the
> > documentation and adds the feature test missed in the v1 patch.
> >
> > Author: Stephane Eranian <eranian@...gle.com>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> I still have some conflicts, but I merged it by hand
>
>
>         patching file tools/build/Makefile.feature
>         patching file tools/build/feature/Makefile
>         patching file tools/build/feature/test-libpfm4.c
>         patching file tools/perf/Documentation/Makefile
>         patching file tools/perf/Documentation/perf-record.txt
>         patching file tools/perf/Documentation/perf-stat.txt
>         patching file tools/perf/Documentation/perf-top.txt
>         patching file tools/perf/Makefile.config
>         patching file tools/perf/Makefile.perf
>         Hunk #3 FAILED at 834.
>         1 out of 3 hunks FAILED -- saving rejects to file tools/perf/Makefile.perf.rej
>         patching file tools/perf/builtin-list.c
>         patching file tools/perf/builtin-record.c
>         patching file tools/perf/builtin-stat.c
>         patching file tools/perf/builtin-top.c
>         Hunk #2 succeeded at 1549 (offset 2 lines).
>         Hunk #3 succeeded at 1567 (offset 2 lines).
>         patching file tools/perf/util/evsel.c
>         patching file tools/perf/util/evsel.h
>         patching file tools/perf/util/parse-events.c
>         patching file tools/perf/util/parse-events.h
>         patching file tools/perf/util/pmu.c
>         Hunk #1 succeeded at 869 (offset 5 lines).
>         patching file tools/perf/util/pmu.h
>         Hunk #1 succeeded at 65 (offset 1 line).
>
> jirka

Thanks for looking at this! I sent a new version (v7):
https://lore.kernel.org/lkml/20200407064018.158555-1-irogers@google.com/T/#u
that adds Stephane's improvements for handling fallback when
perf_event_open fails. Please let us know if there are issues we can
address with the patch set.

Thanks,
Ian