[PATCH V2 0/6] Add osnoise/options file

Daniel Bristot de Oliveira
2022-11-23T17:06:38Z

Was: Allow osnoise tracer to run without workload [1]

After adding the osnoise/options file, a set of on/off options
came to my mind, most based on discussions while debugging problems
with Juri and Clark.

So, this series now goes beyond running osnoise without a workload
by adding a set of practical options using the new osnoise/options file.

The [NO_]OSNOISE_WORKLOAD option allows the tracer to be dispatched
without workload, making the osnoise: tracepoints to become
generic events to measure the execution time of *any* task on Linux.

The PANIC_ON_STOP option facilitates the vmcore generation to aid
in the latency analysis using a crash dump.

The OSNOISE_PREEMPT_DISABLE and OSNOISE_IRQ_DISABLE options refine
the type of noise that the osnoise tracer detects, allowing the
tool to measure only IRQ-related noise, or NMI/HW-related noise,
respectively.

Each patch has a description of the options and the last patch
documents them in the osnoise documentation file.

[1] https://lore.kernel.org/r/cover.1668692096.git.bristot@kernel.org/

Changes from v1:
- Changed the cover letter topic
- Add Acked-by Masami to the first patch
- Add the PANIC_ON_STOP option
- Add the OSNOISE_PREEMPT_DISABLE and OSNOISE_IRQ_DISABLE options
- Improved the documentationa

Daniel Bristot de Oliveira (6):
tracing/osnoise: Fix duration type
tracing/osnoise: Add osnoise/options file
tracing/osnoise: Add OSNOISE_WORKLOAD option
tracing/osnoise: Add PANIC_ON_STOP option
tracing/osnoise: Add preempt and/or irq disabled options
Documentation/osnoise: Add osnoise/options documentation

Documentation/trace/osnoise-tracer.rst | 32 +++-
kernel/trace/trace_osnoise.c | 242 +++++++++++++++++++++++--
2 files changed, 261 insertions(+), 13 deletions(-)

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2.32.0