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