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* [PATCH V2 0/3] osnoise/timerlat improvements
@ 2023-05-23 17:22 Daniel Bristot de Oliveira
  2023-05-23 17:22 ` [PATCH V2 1/3] tracing/osnoise: Switch from PF_NO_SETAFFINITY to migrate_disable Daniel Bristot de Oliveira
                   ` (2 more replies)
  0 siblings, 3 replies; 10+ messages in thread
From: Daniel Bristot de Oliveira @ 2023-05-23 17:22 UTC (permalink / raw)
  To: linux-kernel, linux-trace-kernel, Steven Rostedt
  Cc: Juri Lelli, William White, Daniel Bristot de Oliveira,
	Masami Hiramatsu, Jonathan Corbet

These three patches are improvements for the osnoise/timerlat tracers,
mainly to support rtla. The first one is a dependency for the -C <cgroup>
command line option to be added to rtla. It is essential to allow
timerlat/osnoise to measure the latencies from the container/cgroup
point of view. The second improves rtla time for saving tracing after
a stop tracing condition on osnoise/hwnoise.

The third patch adds the osnoise/per_cpu/cpu$id/timerlat_fd file
where timerlat expects a pinned user thread to open and read from it.
When the thread reads it, it actually activates timerlat latency
measurement mechanism, so timerlat can be activated from an user-space
thread. Timerlat is also expanded to report the return from user-space
latency when read is called after the first call, so adding another
metric to timerlat, that can either represent the kernel-to-user and
user-to-kernel overhead, or to measure the execution time of any
workload. Details are added to the kernel documentation.

Changes from V1:
  - Added the user-space interface patch
  - Link: https://lore.kernel.org/lkml/cover.1683823114.git.bristot@kernel.org/

Daniel Bristot de Oliveira (3):
  tracing/osnoise: Switch from PF_NO_SETAFFINITY to migrate_disable
  tracing/osnoise: Skip running osnoise if all instances are off
  tracing/timerlat: Add user-space interface

 Documentation/trace/timerlat-tracer.rst |  78 +++++
 kernel/trace/trace_osnoise.c            | 411 +++++++++++++++++++++++-
 kernel/trace/trace_output.c             |   4 +-
 3 files changed, 487 insertions(+), 6 deletions(-)

-- 
2.38.1


^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2023-05-25 17:00 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-23 17:22 [PATCH V2 0/3] osnoise/timerlat improvements Daniel Bristot de Oliveira
2023-05-23 17:22 ` [PATCH V2 1/3] tracing/osnoise: Switch from PF_NO_SETAFFINITY to migrate_disable Daniel Bristot de Oliveira
2023-05-23 17:22 ` [PATCH V2 2/3] tracing/osnoise: Skip running osnoise if all instances are off Daniel Bristot de Oliveira
2023-05-23 17:22 ` [PATCH V2 3/3] tracing/timerlat: Add user-space interface Daniel Bristot de Oliveira
2023-05-23 20:59   ` kernel test robot
2023-05-24  8:04   ` kernel test robot
2023-05-24  8:04   ` kernel test robot
2023-05-24 12:48   ` kernel test robot
2023-05-25 14:16     ` Daniel Bristot de Oliveira
2023-05-25 17:00   ` Daniel Bristot de Oliveira

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