Linux Kernel Selftests
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The kernel contains a set of "self tests" under the tools/testing/selftests/
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directory. These are intended to be small tests to exercise individual code
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paths in the kernel. Tests are intended to be run after building, installing
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and booting a kernel.
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On some systems, hot-plug tests could hang forever waiting for cpu and
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memory to be ready to be offlined. A special hot-plug target is created
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to run full range of hot-plug tests. In default mode, hot-plug tests run
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in safe mode with a limited scope. In limited mode, cpu-hotplug test is
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run on a single cpu as opposed to all hotplug capable cpus, and memory
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hotplug test is run on 2% of hotplug capable memory instead of 10%.
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Running the selftests (hotplug tests are run in limited mode)
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=============================================================
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To build the tests:
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$ make -C tools/testing/selftests
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To run the tests:
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$ make -C tools/testing/selftests run_tests
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To build and run the tests with a single command, use:
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$ make kselftest
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- note that some tests will require root privileges.
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Running a subset of selftests
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========================================
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You can use the "TARGETS" variable on the make command line to specify
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single test to run, or a list of tests to run.
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To run only tests targeted for a single subsystem:
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$ make -C tools/testing/selftests TARGETS=ptrace run_tests
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You can specify multiple tests to build and run:
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$ make TARGETS="size timers" kselftest
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See the top-level tools/testing/selftests/Makefile for the list of all
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possible targets.
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Running the full range hotplug selftests
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========================================
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To build the hotplug tests:
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$ make -C tools/testing/selftests hotplug
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To run the hotplug tests:
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$ make -C tools/testing/selftests run_hotplug
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- note that some tests will require root privileges.
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Install selftests
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=================
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You can use kselftest_install.sh tool installs selftests in default
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location which is tools/testing/selftests/kselftest or an user specified
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location.
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To install selftests in default location:
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$ cd tools/testing/selftests
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$ ./kselftest_install.sh
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To install selftests in an user specified location:
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$ cd tools/testing/selftests
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$ ./kselftest_install.sh install_dir
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Contributing new tests
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======================
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In general, the rules for selftests are
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* Do as much as you can if you're not root;
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* Don't take too long;
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* Don't break the build on any architecture, and
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* Don't cause the top-level "make run_tests" to fail if your feature is
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unconfigured.
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