[PATCH RFC 0/3] perf: add logic to collect off-cpu samples

[Ajay Kaher]

Add --off-cpu-kernel option to capture off-cpu sample alongwith on-cpu
samples.

off-cpu samples represent time spent by task when it was on wait queue
(schedule out to waiting for events, blocked on I/O, locks, timers,
paging/swapping, etc)

Refer following links for more details:
https://lpc.events/event/17/contributions/1556/
https://www.youtube.com/watch?v=sF2faKGRnjs

Ajay Kaher (3):
  perf/core: add logic to collect off-cpu sample
  perf/record: add options --off-cpu-kernel
  perf/report: add off-cpu samples

 include/linux/perf_event.h            | 16 ++++++++++++++
 include/uapi/linux/perf_event.h       |  3 ++-
 kernel/events/core.c                  | 27 ++++++++++++++++++-----
 tools/include/uapi/linux/perf_event.h |  3 ++-
 tools/perf/builtin-record.c           |  2 ++
 tools/perf/util/events_stats.h        |  2 ++
 tools/perf/util/evsel.c               |  4 ++++
 tools/perf/util/hist.c                | 31 ++++++++++++++++++++++++---
 tools/perf/util/hist.h                |  1 +
 tools/perf/util/record.h              |  1 +
 tools/perf/util/sample.h              |  1 +
 11 files changed, 81 insertions(+), 10 deletions(-)

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2.39.0