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* [PATCH v2] Documentation: kunit: Update kunit_tool page
@ 2021-04-17  3:45 David Gow
  0 siblings, 0 replies; only message in thread
From: David Gow @ 2021-04-17  3:45 UTC (permalink / raw)
  To: Daniel Latypov, Shuah Khan, Brendan Higgins
  Cc: David Gow, KUnit Development, linux-kselftest,
	Linux Kernel Mailing List, Jonathan Corbet

The kunit_tool documentation page was pretty minimal, and a bit
outdated. Update it and flesh it out a bit.

In particular,
- Mention that .kunitconfig is now in the build directory
- Describe the use of --kunitconfig to specify a different config
- Mention the split functionality (i.e., commands other than 'run')
- Describe --raw_output and parse
- Mention the globbing support
- Provide a quick overview of other options, including --build_dir and

Note that this does overlap a little with the new running_tips page. I
don't think it's a problem having both: this page is supposed to be a
bit more of a reference, rather than a list of useful tips, so the fact
that they both describe the same features isn't a problem.

Signed-off-by: David Gow <>
Reviewed-by: Daniel Latypov <>

Adopted the changes from Daniel.

Changes since v1:
- Mention that the default build directory is '.kunit' when discussing
  '.kunitconfig' files.
- Reword the discussion of 'CONFIG_KUNIT_ALL_TESTS' under '--alltests'

 Documentation/dev-tools/kunit/kunit-tool.rst | 140 +++++++++++++++++--
 1 file changed, 132 insertions(+), 8 deletions(-)

diff --git a/Documentation/dev-tools/kunit/kunit-tool.rst b/Documentation/dev-tools/kunit/kunit-tool.rst
index 29ae2fee8123..4247b7420e3b 100644
--- a/Documentation/dev-tools/kunit/kunit-tool.rst
+++ b/Documentation/dev-tools/kunit/kunit-tool.rst
@@ -22,14 +22,19 @@ not require any virtualization support: it is just a regular program.
 What is a .kunitconfig?
-It's just a defconfig that kunit_tool looks for in the base directory.
-kunit_tool uses it to generate a .config as you might expect. In addition, it
-verifies that the generated .config contains the CONFIG options in the
-.kunitconfig; the reason it does this is so that it is easy to be sure that a
-CONFIG that enables a test actually ends up in the .config.
+It's just a defconfig that kunit_tool looks for in the build directory
+(``.kunit`` by default).  kunit_tool uses it to generate a .config as you might
+expect. In addition, it verifies that the generated .config contains the CONFIG
+options in the .kunitconfig; the reason it does this is so that it is easy to
+be sure that a CONFIG that enables a test actually ends up in the .config.
-How do I use kunit_tool?
+It's also possible to pass a separate .kunitconfig fragment to kunit_tool,
+which is useful if you have several different groups of tests you wish
+to run independently, or if you want to use pre-defined test configs for
+certain subsystems.
+Getting Started with kunit_tool
 If a kunitconfig is present at the root directory, all you have to do is:
@@ -48,10 +53,129 @@ However, you most likely want to use it with the following options:
 .. note::
 	This command will work even without a .kunitconfig file: if no
-        .kunitconfig is present, a default one will be used instead.
+	.kunitconfig is present, a default one will be used instead.
+If you wish to use a different .kunitconfig file (such as one provided for
+testing a particular subsystem), you can pass it as an option.
+.. code-block:: bash
+	./tools/testing/kunit/ run --kunitconfig=fs/ext4/.kunitconfig
 For a list of all the flags supported by kunit_tool, you can run:
 .. code-block:: bash
 	./tools/testing/kunit/ run --help
+Configuring, Building, and Running Tests
+It's also possible to run just parts of the KUnit build process independently,
+which is useful if you want to make manual changes to part of the process.
+A .config can be generated from a .kunitconfig by using the ``config`` argument
+when running kunit_tool:
+.. code-block:: bash
+	./tools/testing/kunit/ config
+Similarly, if you just want to build a KUnit kernel from the current .config,
+you can use the ``build`` argument:
+.. code-block:: bash
+	./tools/testing/kunit/ build
+And, if you already have a built UML kernel with built-in KUnit tests, you can
+run the kernel and display the test results with the ``exec`` argument:
+.. code-block:: bash
+	./tools/testing/kunit/ exec
+The ``run`` command which is discussed above is equivalent to running all three
+of these in sequence.
+All of these commands accept a number of optional command-line arguments. The
+``--help`` flag will give a complete list of these, or keep reading this page
+for a guide to some of the more useful ones.
+Parsing Test Results
+KUnit tests output their results in TAP (Test Anything Protocol) format.
+kunit_tool will, when running tests, parse this output and print a summary
+which is much more pleasant to read. If you wish to look at the raw test
+results in TAP format, you can pass the ``--raw_output`` argument.
+.. code-block:: bash
+	./tools/testing/kunit/ run --raw_output
+.. note::
+	The raw output from test runs may contain other, non-KUnit kernel log
+	lines.
+If you have KUnit results in their raw TAP format, you can parse them and print
+the human-readable summary with the ``parse`` command for kunit_tool. This
+accepts a filename for an argument, or will read from standard input.
+.. code-block:: bash
+	# Reading from a file
+	./tools/testing/kunit/ parse /var/log/dmesg
+	# Reading from stdin
+	dmesg | ./tools/testing/kunit/ parse
+This is very useful if you wish to run tests in a configuration not supported
+by kunit_tool (such as on real hardware, or an unsupported architecture).
+Filtering Tests
+It's possible to run only a subset of the tests built into a kernel by passing
+a filter to the ``exec`` or ``run`` commands. For example, if you only wanted
+to run KUnit resource tests, you could use:
+.. code-block:: bash
+	./tools/testing/kunit/ run 'kunit-resource*'
+This uses the standard glob format for wildcards.
+Other Useful Options
+kunit_tool has a number of other command-line arguments which can be useful
+when adapting it to fit your environment or needs.
+Some of the more useful ones are:
+	Lists all of the available options. Note that different commands
+	(``config``, ``build``, ``run``, etc) will have different supported
+	options. Place ``--help`` before the command to list common options,
+	and after the command for options specific to that command.
+	Specifies the build directory that kunit_tool will use. This is where
+	the .kunitconfig file is located, as well as where the .config and
+	compiled kernel will be placed. Defaults to ``.kunit``.
+	Specifies additional options to pass to ``make`` when compiling a
+	kernel (with the ``build`` or ``run`` commands). For example, to enable
+	compiler warnings, you can pass ``--make_options W=1``.
+        Builds a UML kernel with all config options enabled using ``make
+        allyesconfig``. This allows you to run as many tests as is possible,
+        but is very slow and prone to breakage as new options are added or
+        modified. In most cases, enabling all tests which have satisfied
+        dependencies by adding ``CONFIG_KUNIT_ALL_TESTS=1`` to your
+        .kunitconfig is preferable.
+There are several other options (and new ones are often added), so do check
+``--help`` if you're looking for something not mentioned here.

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2021-04-17  3:45 [PATCH v2] Documentation: kunit: Update kunit_tool page David Gow

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