linux-kernel - [PATCH 5/5] rtla: Documentation: Add --disable-idle-states

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Message-ID: <20240612145439.206990-6-tglozar@redhat.com>
Date: Wed, 12 Jun 2024 16:54:39 +0200
From: tglozar@...hat.com
To: bristot@...nel.org,
	rostedt@...dmis.org
Cc: linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jkacur@...hat.com,
	jwyatt@...hat.com,
	Tomas Glozar <tglozar@...hat.com>
Subject: [PATCH 5/5] rtla: Documentation: Add --disable-idle-states

From: Tomas Glozar <tglozar@...hat.com>

Add --disable-idle-states to manpage and mention libcpupower dependency
in README.txt.

Signed-off-by: Tomas Glozar <tglozar@...hat.com>
---
 Documentation/tools/rtla/common_timerlat_options.rst | 6 ++++++
 tools/tracing/rtla/README.txt                        | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/tools/rtla/common_timerlat_options.rst b/Documentation/tools/rtla/common_timerlat_options.rst
index cef6651f1435..7429e77f95ca 100644
--- a/Documentation/tools/rtla/common_timerlat_options.rst
+++ b/Documentation/tools/rtla/common_timerlat_options.rst
@@ -31,6 +31,12 @@
         *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have
         similar results.
 
+**--disable-idle-states**
+        Set the /sys/devices/system/cpu/cpu<n>/cpuidle/state*/disable files to 1 for cpus
+        that are running timerlat threads to avoid exit from idle latencies. On exit from
+        timerlat, the state*/disable setting is restored to its original value before
+        running timerlat.
+
 **-k**, **--kernel-threads**
 
         Use timerlat kernel-space threads, in contrast of **-u**.
diff --git a/tools/tracing/rtla/README.txt b/tools/tracing/rtla/README.txt
index 4af3fd40f171..6617b9911c81 100644
--- a/tools/tracing/rtla/README.txt
+++ b/tools/tracing/rtla/README.txt
@@ -11,6 +11,7 @@ RTLA depends on the following libraries and tools:
 
  - libtracefs
  - libtraceevent
+ - libcpupower
 
 It also depends on python3-docutils to compile man pages.
 
@@ -26,6 +27,9 @@ For development, we suggest the following steps for compiling rtla:
   $ make
   $ sudo make install
   $ cd ..
+  $ cd $libcpupower_src
+  $ make
+  $ sudo make install
   $ cd $rtla_src
   $ make
   $ sudo make install
-- 
2.43.0