linux-kernel - [PATCH V3 0/2] rtla: Add hwnoise tool

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Date:   Tue,  7 Feb 2023 22:48:49 +0100
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jonathan Corbet <corbet@....net>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        linux-trace-devel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V3 0/2] rtla: Add hwnoise tool

This series present a new tool inside rtla. It is named hwnoise.

hwnoise dispatches the osnoise tracer and displays a summary of the noise.
The difference is that it runs the tracer with the OSNOISE_IRQ_DISABLE
option set, thus only allowing only hardware-related noise, resulting in
a simplified output. hwnoise has the same features of osnoise.

An example of the tool's output:

 # rtla hwnoise -c 1-5 -T 1 -d 10m -q
                                           Hardware-related Noise
 duration:   0 00:10:00 | time is in us
 CPU Period       Runtime        Noise  % CPU Aval   Max Noise   Max Single          HW          NMI
   1 #599       599000000          138    99.99997           3            3           4           74
   2 #599       599000000           85    99.99998           3            3           4           75
   3 #599       599000000           86    99.99998           4            3           6           75
   4 #599       599000000           81    99.99998           4            4           2           75
   5 #599       599000000           85    99.99998           2            2           2           75

Changes from v2:
  Consolidate patches 1/5 into a single one (Steven)
  Change the osnoise option macro to code (Steven)
Changes from v1:
  Add rtla-hwnoise to the rtla documentation index
	(kernel test robot/Bagas Sanjaya)

Daniel Bristot de Oliveira (2):
  rtla: Add hwnoise tool
  Documentation/rtla: Add hwnoise man page

 Documentation/tools/rtla/index.rst        |   1 +
 Documentation/tools/rtla/rtla-hwnoise.rst | 107 ++++++++++++++++++++
 tools/tracing/rtla/Makefile               |   2 +
 tools/tracing/rtla/src/osnoise.c          | 117 ++++++++++++++++++++++
 tools/tracing/rtla/src/osnoise.h          |   7 ++
 tools/tracing/rtla/src/osnoise_top.c      |  84 +++++++++++++---
 tools/tracing/rtla/src/rtla.c             |   4 +
 7 files changed, 306 insertions(+), 16 deletions(-)
 create mode 100644 Documentation/tools/rtla/rtla-hwnoise.rst

-- 
2.38.1