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| author | Daniel Bristot de Oliveira <bristot@kernel.org> | 2024-04-24 16:36:56 +0200 |
|---|---|---|
| committer | Daniel Bristot de Oliveira <bristot@kernel.org> | 2024-05-15 15:13:57 +0200 |
| commit | fb9e90a67ee9a42779a8ea296a4cf7734258b27d (patch) | |
| tree | 54f52790248382ad671064f1d9ceca1b132fbc1d /Documentation/tools | |
| parent | cdbf71962bb07493d67fee34536a5724a8bb5886 (diff) | |
| download | linux-stable-fb9e90a67ee9a42779a8ea296a4cf7734258b27d.tar.gz linux-stable-fb9e90a67ee9a42779a8ea296a4cf7734258b27d.tar.bz2 linux-stable-fb9e90a67ee9a42779a8ea296a4cf7734258b27d.zip | |
rtla/timerlat: Make user-space threads the default
After ther -u addition, most of the known users are setting it. And
it makes sense, as it adds more information, and inherits the default
setup for the threads - e.g., cgroups configs.
Thus, if the user-space interface is available, enable -u. Otherwise,
use the in-kernel thread.
Add the -k option to allow the user to request kernel-threads.
Link: https://lkml.kernel.org/r/9241d3089de4091b124f780ed832a0e6646cadaa.1713968967.git.bristot@kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Diffstat (limited to 'Documentation/tools')
| -rw-r--r-- | Documentation/tools/rtla/common_timerlat_options.rst | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/tools/rtla/common_timerlat_options.rst b/Documentation/tools/rtla/common_timerlat_options.rst index d3255ed70195..090700a6ae9f 100644 --- a/Documentation/tools/rtla/common_timerlat_options.rst +++ b/Documentation/tools/rtla/common_timerlat_options.rst @@ -27,12 +27,16 @@ *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have similar results. +**-k**, **--kernel-threads** + + Use timerlat kernel-space threads, in contrast of **-u**. + **-u**, **--user-threads** Set timerlat to run without a workload, and then dispatches user-space workloads to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again adding so the measurement for the kernel-to-user and user-to-kernel to the tracer - output. + output. **--user-threads** will be used unless the user specify **-k**. **-U**, **--user-load** |