From 3c415707b37f1e4483c418c77f57692b89bcfd5e Mon Sep 17 00:00:00 2001 From: Tim Bird Date: Wed, 19 Nov 2014 16:16:16 -0800 Subject: kselftest: Move the docs to the Documentation dir Also, adjust the formatting a bit, and expand the section about using TARGETS= on the make command line. Signed-off-by: Tim Bird Acked-by: Shuah Khan Signed-off-by: Jonathan Corbet --- Documentation/kselftest.txt | 69 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 Documentation/kselftest.txt (limited to 'Documentation/kselftest.txt') diff --git a/Documentation/kselftest.txt b/Documentation/kselftest.txt new file mode 100644 index 000000000000..a87d840bacfe --- /dev/null +++ b/Documentation/kselftest.txt @@ -0,0 +1,69 @@ +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 + +To build and run the tests with a single command, use: + $ make kselftest + +- note that some tests will require root privileges. + + +Running a subset of selftests +======================================== +You can use the "TARGETS" variable on the make command line to specify +single test to run, or a list of tests to run. + +To run only tests targeted for a single subsystem: + $ make -C tools/testing/selftests TARGETS=ptrace run_tests + +You can specify multiple tests to build and run: + $ make TARGETS="size timers" kselftest + +See the top-level tools/testing/selftests/Makefile for the list of all +possible targets. + + +Running the full range hotplug selftests +======================================== + +To build the hotplug tests: + $ make -C tools/testing/selftests hotplug + +To run the hotplug 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. -- cgit v1.2.3