linux-kernel - Re: [PATCH v2 0/4] Tidy user rdpmc documentation and testing

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Message-ID: <CAP-5=fXJOB6aVcZdQ8cdejt5Jc_k_5jYGEGU7MJ++5qoxSsVpg@mail.gmail.com>
Date:   Tue, 19 Jul 2022 08:50:55 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Cc:     Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 0/4] Tidy user rdpmc documentation and testing

On Wed, Jun 8, 2022 at 10:24 PM Ian Rogers <irogers@...gle.com> wrote:
>
> libperf's perf_mmap__read_self and the addition of arm64 support mean
> that the perf_event.h and the rdpmc perf test have become
> stale. Refresh the documentation in perf_event.h, remove the x86 rdpmc
> test and port the libperf test as a non-architecture specific test.
>
> Address sanitizer testing showed libperf leaking fds when the
> perf_event_open failed, add error paths to handle this.
>
> A comment is added to perf_event.h to avoid a divide by zero when
> scaling counts if the running time is 0. This was previously discussed
> in this thread:
> https://lore.kernel.org/lkml/CAP-5=fVRdqvswtyQMg5cB+ntTGda+SAYskjTQednEH-AeZo13g@mail.gmail.com/
>
> v2. Alters the skip in test_stat_user_read for open to always be a
>     skip as perf_event_open may fail with EACCES (permissions), ENOSYS
>     (not supported) and ENOENT (hypervisor). Adds Rob Herring's
>     acked-by on patch 3.
>
> Ian Rogers (4):
>   libperf evsel: Open shouldn't leak fd on failure
>   perf: Align user space counter reading with code
>   perf test: Remove x86 rdpmc test
>   perf test: Add user space counter reading tests

Ping. Would be nice to get this cleaned up in the next release, plus
better testing.

Thanks,
Ian

>  include/uapi/linux/perf_event.h        |  32 +++--
>  tools/include/uapi/linux/perf_event.h  |  32 +++--
>  tools/lib/perf/evsel.c                 |  17 ++-
>  tools/perf/arch/x86/tests/Build        |   1 -
>  tools/perf/arch/x86/tests/arch-tests.c |   2 -
>  tools/perf/arch/x86/tests/rdpmc.c      | 182 -------------------------
>  tools/perf/tests/mmap-basic.c          | 127 ++++++++++++++++-
>  7 files changed, 176 insertions(+), 217 deletions(-)
>  delete mode 100644 tools/perf/arch/x86/tests/rdpmc.c
>
> --
> 2.36.1.255.ge46751e96f-goog
>