linux-kernel - Re: [PATCH v3 1/2] perf test: Workload test of metric and metricgroups

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Date:   Wed, 12 Jan 2022 10:34:50 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     John Garry <john.garry@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ian Rogers <irogers@...gle.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        eranian@...gle.com
Subject: Re: [PATCH v3 1/2] perf test: Workload test of metric and metricgroups



On January 12, 2022 9:24:29 AM GMT-03:00, John Garry <john.garry@...wei.com> wrote:
>On 24/09/2021 20:09, Arnaldo Carvalho de Melo wrote:
>> Em Fri, Sep 17, 2021 at 11:42:39AM -0700, Ian Rogers escreveu:
>>> Test every metric and metricgroup with 'true' as a workload. For
>>> metrics, check that we see the metric printed or get unsupported. If the
>>> 'true' workload executes too quickly retry with 'perf bench internals
>>> synthesize'.
>>>
>>> v3. Fix test condition (thanks to Paul A. Clarke<pc@...ibm.com>). Add a
>>>      fallback case of a larger workload so that we don't ignore "<not
>>>      counted>".
>>> v2. Switched the workload to something faster.
>
>Hi Ian,
>
>I just noticed that this test fails on my broadwell machine.
>
>I am using acme perf/core @ 09dd3c22daaf

Hi,

Can you try with tmp.perf/perf_cpu instead?

There's a patch there that maybe fixes this.

- Arnaldo
>
>metricgroup Memory_Bw fails, and it seems because of the "true" argument 
>to "perf stat" (or any argument, like sleep 1):
>
>john@...alhost:~/kernel-dev9/tools/perf> sudo ./perf stat -M Memory_BW
>^C
>  Performance counter stats for 'system wide':
>
>              2,184      arb/event=0x84,umask=0x1/ #     0.26 
>DRAM_BW_Use
>          2,954,938      arb/event=0x81,umask=0x1/ 
>
>        736,368,852 ns   duration_time 
>
>         58,202,980      l1d_pend_miss.pending_cycles #     2.34 MLP 
>                  (80.11%)
>        136,293,194      l1d_pend_miss.pending 
>               (19.89%)
>        736,368,852 ns   duration_time 
>
>          1,065,656      longest_lat_cache.miss    #     0.09 
>L3_Cache_Fill_BW         (39.71%)
>        736,368,852 ns   duration_time 
>
>          5,365,477      l2_lines_in.all           #     0.47 
>L2_Cache_Fill_BW         (59.80%)
>        736,368,852 ns   duration_time 
>
>          3,557,362      l1d.replacement           #     0.31 
>L1D_Cache_Fill_BW        (79.90%)
>        736,368,852 ns   duration_time 
>
>
>        0.736368852 seconds time elapsed
>
>
>john@...alhost:~/kernel-dev9/tools/perf> sudo ./perf stat -M Memory_BW true
>Error:
>The sys_perf_event_open() syscall returned with 22 (Invalid argument) 
>for event (arb/event=0x84,umask=0x1/).
>/bin/dmesg | grep -i perf may provide additional information.
>
>john@...alhost:~/kernel-dev9/tools/perf>
>
>Anyone any idea on this before I start digging?
>
>Thanks,
>John