linux-kernel - Re: [PATCH] perf test: Add perf_event_attr tests for the arm

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Date:   Sat, 5 Feb 2022 16:10:13 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     German Gomez <german.gomez@....com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        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>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH] perf test: Add perf_event_attr tests for the arm_spe
 event

Hi German,

On Wed, Jan 26, 2022 at 04:07:09PM +0000, German Gomez wrote:
> Adds a couple of perf_event_attr tests for the fix introduced in [1].
> The tests check that the correct sample_period value is set in the
> struct perf_event_attr of the arm_spe events.
> 
> [1]: https://lore.kernel.org/all/20220118144054.2541-1-german.gomez@arm.com/
> 
> Signed-off-by: German Gomez <german.gomez@....com>

I tested this patch with two commands:

# PERF_TEST_ATTR=/tmp /usr/bin/python2 ./tests/attr.py -d ./tests/attr/ \
        -p ./perf -vvvvv -t test-record-spe-period
# PERF_TEST_ATTR=/tmp /usr/bin/python2 ./tests/attr.py -d ./tests/attr/ \
        -p ./perf -vvvvv -t test-record-spe-period-term

Both testing can pass on Hisilicon D06 board.

One question: I'm a bit concern this case will fail on some Arm64
platforms which doesn't contain Arm SPE modules.  E.g. below commands
will always fail on Arm64 platforms if SPE module is absent.  So I am
wandering if we can add extra checking ARM SPE event is existed or not?

  # ./perf test list
   17: Setup struct perf_event_attr
  # ./perf test 17

Thanks,
Leo

> ---
>  tools/perf/tests/attr/README                  |  2 +
>  tools/perf/tests/attr/base-record-spe         | 40 +++++++++++++++++++
>  tools/perf/tests/attr/test-record-spe-period  | 12 ++++++
>  .../tests/attr/test-record-spe-period-term    | 12 ++++++
>  4 files changed, 66 insertions(+)
>  create mode 100644 tools/perf/tests/attr/base-record-spe
>  create mode 100644 tools/perf/tests/attr/test-record-spe-period
>  create mode 100644 tools/perf/tests/attr/test-record-spe-period-term
> 
> diff --git a/tools/perf/tests/attr/README b/tools/perf/tests/attr/README
> index 1116fc6bf2ac..454505d343fa 100644
> --- a/tools/perf/tests/attr/README
> +++ b/tools/perf/tests/attr/README
> @@ -58,6 +58,8 @@ Following tests are defined (with perf commands):
>    perf record -c 100 -P kill                    (test-record-period)
>    perf record -c 1 --pfm-events=cycles:period=2 (test-record-pfm-period)
>    perf record -R kill                           (test-record-raw)
> +  perf record -c 2 -e arm_spe_0// -- kill       (test-record-spe-period)
> +  perf record -e arm_spe_0/period=3/ -- kill    (test-record-spe-period-term)
>    perf stat -e cycles kill                      (test-stat-basic)
>    perf stat kill                                (test-stat-default)
>    perf stat -d kill                             (test-stat-detailed-1)
> diff --git a/tools/perf/tests/attr/base-record-spe b/tools/perf/tests/attr/base-record-spe
> new file mode 100644
> index 000000000000..08fa96b59240
> --- /dev/null
> +++ b/tools/perf/tests/attr/base-record-spe
> @@ -0,0 +1,40 @@
> +[event]
> +fd=*
> +group_fd=-1
> +flags=*
> +cpu=*
> +type=*
> +size=*
> +config=*
> +sample_period=*
> +sample_type=*
> +read_format=*
> +disabled=*
> +inherit=*
> +pinned=*
> +exclusive=*
> +exclude_user=*
> +exclude_kernel=*
> +exclude_hv=*
> +exclude_idle=*
> +mmap=*
> +comm=*
> +freq=*
> +inherit_stat=*
> +enable_on_exec=*
> +task=*
> +watermark=*
> +precise_ip=*
> +mmap_data=*
> +sample_id_all=*
> +exclude_host=*
> +exclude_guest=*
> +exclude_callchain_kernel=*
> +exclude_callchain_user=*
> +wakeup_events=*
> +bp_type=*
> +config1=*
> +config2=*
> +branch_sample_type=*
> +sample_regs_user=*
> +sample_stack_user=*
> diff --git a/tools/perf/tests/attr/test-record-spe-period b/tools/perf/tests/attr/test-record-spe-period
> new file mode 100644
> index 000000000000..75f8c9cd8e3f
> --- /dev/null
> +++ b/tools/perf/tests/attr/test-record-spe-period
> @@ -0,0 +1,12 @@
> +[config]
> +command = record
> +args    = --no-bpf-event -c 2 -e arm_spe_0// -- kill >/dev/null 2>&1
> +ret     = 1
> +arch    = aarch64
> +
> +[event-10:base-record-spe]
> +sample_period=2
> +freq=0
> +
> +# dummy event
> +[event-1:base-record-spe]
> diff --git a/tools/perf/tests/attr/test-record-spe-period-term b/tools/perf/tests/attr/test-record-spe-period-term
> new file mode 100644
> index 000000000000..8f60a4fec657
> --- /dev/null
> +++ b/tools/perf/tests/attr/test-record-spe-period-term
> @@ -0,0 +1,12 @@
> +[config]
> +command = record
> +args    = --no-bpf-event -e arm_spe_0/period=3/ -- kill >/dev/null 2>&1
> +ret     = 1
> +arch    = aarch64
> +
> +[event-10:base-record-spe]
> +sample_period=3
> +freq=0
> +
> +# dummy event
> +[event-1:base-record-spe]
> -- 
> 2.25.1
>