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From:   Yang Jihong <yangjihong1@huawei.com>
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CC:     <yangjihong1@huawei.com>
Subject: [PATCH v2 0/7] perf record: Track sideband events for all CPUs when tracing selected CPUs
Date:   Sat, 15 Jul 2023 03:29:08 +0000
Message-ID: <20230715032915.97146-1-yangjihong1@huawei.com>
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User space tasks can migrate between CPUs, track sideband events for all
CPUs.

The specific scenarios are as follows:

         CPU0                                 CPU1
  perf record -C 0 start
                              taskA starts to be created and executed
                                -> PERF_RECORD_COMM and PERF_RECORD_MMAP
                                   events only deliver to CPU1
                              ......
                                |
                          migrate to CPU0
                                |
  Running on CPU0    <----------/
  ...

  perf record -C 0 stop

Now perf samples the PC of taskA. However, perf does not record the
PERF_RECORD_COMM and PERF_RECORD_COMM events of taskA.
Therefore, the comm and symbols of taskA cannot be parsed.

The sys_perf_event_open invoked is as follows:

  # perf --debug verbose=3 record -e cpu-clock -C 1 true
  <SNIP>
  Opening: cpu-clock
  ------------------------------------------------------------
  perf_event_attr:
    type                             1
    size                             136
    { sample_period, sample_freq }   4000
    sample_type                      IP|TID|TIME|ID|CPU|PERIOD
    read_format                      ID|LOST
    disabled                         1
    inherit                          1
    freq                             1
    sample_id_all                    1
    exclude_guest                    1
  ------------------------------------------------------------
  sys_perf_event_open: pid -1  cpu 1  group_fd -1  flags 0x8 = 5
  Opening: dummy:HG
  ------------------------------------------------------------
  perf_event_attr:
    type                             1
    size                             136
    config                           0x9
    { sample_period, sample_freq }   1
    sample_type                      IP|TID|TIME|CPU|IDENTIFIER
    read_format                      ID|LOST
    inherit                          1
    exclude_kernel                   1
    exclude_hv                       1
    mmap                             1
    comm                             1
    task                             1
    sample_id_all                    1
    exclude_guest                    1
    mmap2                            1
    comm_exec                        1
    ksymbol                          1
    bpf_event                        1
  ------------------------------------------------------------
  sys_perf_event_open: pid -1  cpu 0  group_fd -1  flags 0x8 = 6
  sys_perf_event_open: pid -1  cpu 1  group_fd -1  flags 0x8 = 7
  sys_perf_event_open: pid -1  cpu 2  group_fd -1  flags 0x8 = 9
  sys_perf_event_open: pid -1  cpu 3  group_fd -1  flags 0x8 = 10
  sys_perf_event_open: pid -1  cpu 4  group_fd -1  flags 0x8 = 11
  sys_perf_event_open: pid -1  cpu 5  group_fd -1  flags 0x8 = 12
  sys_perf_event_open: pid -1  cpu 6  group_fd -1  flags 0x8 = 13
  sys_perf_event_open: pid -1  cpu 7  group_fd -1  flags 0x8 = 14
  <SNIP>

Changes since v1:
 - Add perf_evlist__go_system_wide() via internal/evlist.h instead of
   exporting perf_evlist__propagate_maps().
 - Use evlist__add_aux_dummy() instead of evlist__add_dummy() in
   evlist__findnew_tracking_event().
 - Add a parameter in evlist__findnew_tracking_event() to deal with
   system_wide inside.
 - Add sideband for all CPUs when tracing selected CPUs comments on
   the perf record man page.
 - Use "sideband events" instead of "tracking events".
 - Adjust the patches Sequence.
 - Add patch5 to skip dummy event sample_type check for evlist_config.
 - Add patch6 to update system-wide-dummy attr values for perf test.

Yang Jihong (7):
  perf evlist: Add perf_evlist__go_system_wide() helper
  perf evlist: Add evlist__findnew_tracking_event() helper
  perf record: Move setting dummy tracking before
    record__init_thread_masks()
  perf record: Track sideband events for all CPUs when tracing selected
    CPUs
  perf evlist: Skip dummy event sample_type check for evlist_config
  perf test: Update system-wide-dummy attr expected values
  perf test: Add test case for record sideband events

 tools/lib/perf/evlist.c                   |  9 +++
 tools/lib/perf/include/internal/evlist.h  |  2 +
 tools/perf/Documentation/perf-record.txt  |  3 +
 tools/perf/builtin-record.c               | 69 ++++++++++++++---------
 tools/perf/tests/attr/system-wide-dummy   | 12 ++--
 tools/perf/tests/shell/record_tracking.sh | 44 +++++++++++++++
 tools/perf/util/evlist.c                  | 18 ++++++
 tools/perf/util/evlist.h                  |  1 +
 tools/perf/util/record.c                  |  7 +++
 9 files changed, 132 insertions(+), 33 deletions(-)
 create mode 100755 tools/perf/tests/shell/record_tracking.sh

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2.30.GIT