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Subject[PATCH 0/2] force absolute timestamp trace option
From
Normally a data event includes the delta time between itself and
the previous data event. But if a write interrupts another write
then the event cannot check the timestamp of the previous event
and so it uses a delta of 0.

Adds a new trace option: force-abs-timestamp. When this is on
each event is proceeded by an absolute timestamp event.

This follows from a discussion between jbehmer@google.com
and Steven Rostedt found here:

https://lkml.org/lkml/2019/5/24/710

Korben Rusek (2):
Add force-abs-timestamp trace option.
tests for absolute timestamp

Documentation/trace/ftrace.rst | 5 +
kernel/trace/trace.c | 4 +
kernel/trace/trace.h | 1 +
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/timestamp/Makefile | 25 +++
tools/testing/selftests/timestamp/abs-test.sh | 156 ++++++++++++++
.../selftests/timestamp/abs-timestamp.c | 198 ++++++++++++++++++
7 files changed, 390 insertions(+)
create mode 100644 tools/testing/selftests/timestamp/Makefile
create mode 100644 tools/testing/selftests/timestamp/abs-test.sh
create mode 100644 tools/testing/selftests/timestamp/abs-timestamp.c

--
2.27.0.290.gba653c62da-goog

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