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Message-ID: <5889e93b-5ee3-8d59-c2fb-bce7070a1ab2@intel.com>
Date:   Thu, 20 Jul 2023 13:00:58 +0300
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From:   Adrian Hunter <adrian.hunter@intel.com>
Subject: Re: [PATCH v3 0/3] perf: add new option '--workload-attr' to set
 workload sched_policy/priority/mask
To:     Changbin Du <changbin.du@huawei.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>
Cc:     Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Ian Rogers <irogers@google.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
        Hui Wang <hw.huiwang@huawei.com>
References: <20230718033355.2960912-1-changbin.du@huawei.com>
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On 18/07/23 06:33, Changbin Du wrote:
> This adds a new option '--workload-attr' to set the sched_policy/priority/mask
> of the workload to reduce system noise.
> 
> $ sudo perf stat --workload-attr fifo,40,0-3:7 -- ls

Not really sold on the need for this, but maybe it could be
simpler.
What about just adding a hook for a command (e.g. script) to
run before exec'ing the workload e.g.

--configure-workload=blah.sh

results in perf doing system("blah.sh 12345") where 12345
is the workload PID.

Then maybe you could do:

--configure-workload="taskset -p 0x3"


> 
> Please see patch 1/2 for more details.
> 
> v3:
>   - replace taskset with --workload-attr option in documents and tests.
> v2:
>   - Use cpu list spec instead of cpu mask number.
>   - Update documents.
> 
> Changbin Du (3):
>   perf cpumap: Add __perf_cpu_map__new and perf_cpu_map__2_cpuset
>   perf: add new option '--workload-attr' to set workload
>     sched_policy/priority/mask
>   perf: replace taskset with --workload-attr option
> 
>  tools/lib/perf/cpumap.c                       |  45 ++++++-
>  tools/lib/perf/include/perf/cpumap.h          |   4 +
>  tools/lib/perf/libperf.map                    |   2 +
>  tools/perf/Documentation/intel-hybrid.txt     |   2 +-
>  tools/perf/Documentation/perf-record.txt      |   7 ++
>  tools/perf/Documentation/perf-stat.txt        |   8 +-
>  tools/perf/builtin-record.c                   |  26 ++++
>  tools/perf/builtin-stat.c                     |  18 +++
>  tools/perf/tests/cpumap.c                     |  23 ++++
>  .../tests/shell/stat_bpf_counters_cgrp.sh     |   2 +-
>  tools/perf/tests/shell/test_arm_coresight.sh  |   2 +-
>  tools/perf/tests/shell/test_data_symbol.sh    |   2 +-
>  tools/perf/tests/shell/test_intel_pt.sh       |   2 +-
>  tools/perf/util/evlist.c                      | 117 ++++++++++++++++++
>  tools/perf/util/evlist.h                      |   3 +
>  tools/perf/util/target.h                      |   9 ++
>  16 files changed, 263 insertions(+), 9 deletions(-)
>