[PATCH v5 0/5] perf: Add new option '--workload-config' to set workload sched_policy/prio/cpumask

[Changbin Du]

[I still think this is a handy option, so do some improvment and resend it.]

To get consistent benchmarking results, sometimes we need to set the
sched_policy/priority/cpumask of the workload to reduce system noise.

For example, CPU binding is required on big.little system.

  $ perf stat -- taskset -c 0 ls

However, the events of 'taskset' itself are also counted here. To get more
accurate result, this should be avoided.

To get away of the middleman, this adds a new option '--workload-config' to
do the same jobs for stat and record commands.

  --workload-config <[sched_policy=policy][,sched_prio=priority][,cpu-list=list]>
        setup target workload (the <command>) attributes:

                sched_policy: other|fifo|rr|batch|idle
                sched_prio: scheduling priority for fifo|rr, nice value for other
                cpu-list: CPU affinity. e.g. 1-3:5 is processors #1, #2, #3 and #5

For example,

  $ sudo perf stat --workload-config sched_policy=fifo,sched_prio=40,cpu-list=0-3:7 -- ls

Above command will make 'ls' run on CPU #0-#3 and #7 with fifo scheduler and
realtime priority is 40.

v5:
  o rename '--workload-attr' as '--workload-config' (sounds better) .
  o transform to key-value pair style option.

v4:
  - add a test case for perf-stat. (suggeted by Ian Rogers)
  - fix warning found by 0-DAY.
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 (5):
  perf cpumap: Add __perf_cpu_map__new and perf_cpu_map__2_cpuset
  perf: util: support string type option for perf_parse_sublevel_options
  perf: add new option '--workload-config' to set workload
    sched_policy/prio/cpumask
  perf: replace taskset with --workload-config option
  perf test: add test case for --workload-config 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                   |  27 +++++
 tools/perf/builtin-stat.c                     |  19 +++
 tools/perf/tests/cpumap.c                     |  23 ++++
 tools/perf/tests/shell/stat.sh                |  19 +++
 .../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                      | 108 ++++++++++++++++++
 tools/perf/util/evlist.h                      |   3 +
 tools/perf/util/parse-sublevel-options.c      |  12 +-
 tools/perf/util/parse-sublevel-options.h      |   7 ++
 tools/perf/util/target.h                      |   9 ++
 19 files changed, 291 insertions(+), 12 deletions(-)

-- 
2.25.1