summaryrefslogtreecommitdiff
path: root/Documentation/tools
diff options
context:
space:
mode:
authorDaniel Bristot de Oliveira <bristot@kernel.org>2023-06-06 18:12:25 +0200
committerSteven Rostedt (Google) <rostedt@goodmis.org>2023-06-13 16:43:37 -0400
commit6127383217741615f3450b684ecbee1ff570ee98 (patch)
treed42095e197b1fde9f614a5873c2a6373e0ab1813 /Documentation/tools
parented774f7481fa0bcf9978556ae828aa1de9f22e20 (diff)
Documentation: Add tools/rtla timerlat -u option documentation
Add the -u/--user-thread option documentation for timerlat top/hist. Link: https://lkml.kernel.org/r/bf727c8ccb8f50792200ae620141e047edf4af7a.1686066600.git.bristot@kernel.org Cc: William White <chwhite@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Tested-by: Juri Lelli <juri.lelli@redhat.com> Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/tools')
-rw-r--r--Documentation/tools/rtla/common_timerlat_options.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/tools/rtla/common_timerlat_options.rst b/Documentation/tools/rtla/common_timerlat_options.rst
index bacdea6de7a3..88506b397c2d 100644
--- a/Documentation/tools/rtla/common_timerlat_options.rst
+++ b/Documentation/tools/rtla/common_timerlat_options.rst
@@ -26,3 +26,10 @@
Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies.
*cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have
similar results.
+
+**-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.