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0d5792c9bc
Remove some of the outmoded "Why KUnit" rationale, and move some UML-specific information to the kunit_tool page. Also update the Getting Started guide to mention running tests without the kunit_tool wrapper. Signed-off-by: David Gow <davidgow@google.com> Reviewed-by: Frank Rowand <frank.rowand@sony.com> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Reviewed-by: Brendan Higgins <brendanhiggins@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
65 lines
2.2 KiB
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65 lines
2.2 KiB
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.. SPDX-License-Identifier: GPL-2.0
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=================
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kunit_tool How-To
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=================
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What is kunit_tool?
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===================
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kunit_tool is a script (``tools/testing/kunit/kunit.py``) that aids in building
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the Linux kernel as UML (`User Mode Linux
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<http://user-mode-linux.sourceforge.net/>`_), running KUnit tests, parsing
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the test results and displaying them in a user friendly manner.
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kunit_tool addresses the problem of being able to run tests without needing a
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virtual machine or actual hardware with User Mode Linux. User Mode Linux is a
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Linux architecture, like ARM or x86; however, unlike other architectures it
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compiles the kernel as a standalone Linux executable that can be run like any
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other program directly inside of a host operating system. To be clear, it does
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not require any virtualization support: it is just a regular program.
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What is a kunitconfig?
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======================
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It's just a defconfig that kunit_tool looks for in the base directory.
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kunit_tool uses it to generate a .config as you might expect. In addition, it
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verifies that the generated .config contains the CONFIG options in the
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kunitconfig; the reason it does this is so that it is easy to be sure that a
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CONFIG that enables a test actually ends up in the .config.
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How do I use kunit_tool?
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========================
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If a kunitconfig is present at the root directory, all you have to do is:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run
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However, you most likely want to use it with the following options:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run --timeout=30 --jobs=`nproc --all`
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- ``--timeout`` sets a maximum amount of time to allow tests to run.
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- ``--jobs`` sets the number of threads to use to build the kernel.
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If you just want to use the defconfig that ships with the kernel, you can
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append the ``--defconfig`` flag as well:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run --timeout=30 --jobs=`nproc --all` --defconfig
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.. note::
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This command is particularly helpful for getting started because it
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just works. No kunitconfig needs to be present.
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For a list of all the flags supported by kunit_tool, you can run:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run --help
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