linux-kernel - [for-next][PATCH 11/11] Documentation: Add tools/rtla timerlat -u option documentation

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Date:   Tue, 13 Jun 2023 18:08:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        William White <chwhite@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: [for-next][PATCH 11/11] Documentation: Add tools/rtla timerlat -u option documentation

From: Daniel Bristot de Oliveira <bristot@...nel.org>

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@...hat.com>
Cc: Jonathan Corbet <corbet@....net>
Tested-by: Juri Lelli <juri.lelli@...hat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 Documentation/tools/rtla/common_timerlat_options.rst | 7 +++++++
 1 file changed, 7 insertions(+)

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.
-- 
2.39.2