[PATCH v5 0/4] *** Latency histograms - IRQSOFF,PREEMPTOFF ***

[Binoy Jayan]

Hi,

Thank you Daniel, Steven for reviewing the code and for the comments.
I have made the changes mentioned below and have added the hack to mark
the field cpu as a key.

These set of patches [v5] capture latency events caused by interrupts and
premption disabled in kernel. The patches are based on the hist trigger
feature developed by Tom Zanussi.

v4: https://lkml.org/lkml/2016/8/30/188
v3: https://lkml.org/lkml/2016/8/29/50
v2: https://lkml.org/lkml/2016/8/24/296

Changes from v4
  - Added unlikely() for less probable paths
  - Dropped field 'ccomm' for hrtimer latency
  - Patch to mark the generic field cpu as a key field and make it part
    of histogram output
  - Changed ambiguous function names

TODO:
1. kselftest test scripts
2. delayed hrtimer offset test scenario

Thanks,
Binoy

Binoy Jayan (3):
  tracing: Add cpu as a key field in histogram
  tracing: Add trace_irqsoff tracepoints
  tracing: Histogram for delayed hrtimer offsets

Daniel Wagner (1):
  tracing: Deference pointers without RCU checks

 include/linux/hrtimer.h             |  3 ++
 include/linux/rculist.h             | 36 ++++++++++++++++++
 include/linux/tracepoint.h          |  4 +-
 include/trace/events/latency.h      | 73 +++++++++++++++++++++++++++++++++++++
 kernel/time/hrtimer.c               | 46 +++++++++++++++++++++++
 kernel/trace/trace_events.c         |  3 +-
 kernel/trace/trace_events_filter.c  |  4 +-
 kernel/trace/trace_events_hist.c    | 15 ++++++++
 kernel/trace/trace_events_trigger.c |  6 +--
 kernel/trace/trace_irqsoff.c        | 35 ++++++++++++++++++
 10 files changed, 217 insertions(+), 8 deletions(-)
 create mode 100644 include/trace/events/latency.h

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