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1 | Linux Kernel Selftests | |
2 | ||
3 | The kernel contains a set of "self tests" under the tools/testing/selftests/ | |
4 | directory. These are intended to be small unit tests to exercise individual | |
5 | code paths in the kernel. | |
6 | ||
7 | On some systems, hot-plug tests could hang forever waiting for cpu and | |
8 | memory to be ready to be offlined. A special hot-plug target is created | |
9 | to run full range of hot-plug tests. In default mode, hot-plug tests run | |
10 | in safe mode with a limited scope. In limited mode, cpu-hotplug test is | |
11 | run on a single cpu as opposed to all hotplug capable cpus, and memory | |
12 | hotplug test is run on 2% of hotplug capable memory instead of 10%. | |
13 | ||
14 | Running the selftests (hotplug tests are run in limited mode) | |
15 | ============================================================= | |
16 | ||
17 | To build the tests: | |
18 | $ make -C tools/testing/selftests | |
19 | ||
20 | ||
21 | To run the tests: | |
22 | $ make -C tools/testing/selftests run_tests | |
23 | ||
24 | To build and run the tests with a single command, use: | |
25 | $ make kselftest | |
26 | ||
27 | - note that some tests will require root privileges. | |
28 | ||
29 | ||
30 | Running a subset of selftests | |
31 | ======================================== | |
32 | You can use the "TARGETS" variable on the make command line to specify | |
33 | single test to run, or a list of tests to run. | |
34 | ||
35 | To run only tests targeted for a single subsystem: | |
36 | $ make -C tools/testing/selftests TARGETS=ptrace run_tests | |
37 | ||
38 | You can specify multiple tests to build and run: | |
39 | $ make TARGETS="size timers" kselftest | |
40 | ||
41 | See the top-level tools/testing/selftests/Makefile for the list of all | |
42 | possible targets. | |
43 | ||
44 | ||
45 | Running the full range hotplug selftests | |
46 | ======================================== | |
47 | ||
48 | To build the hotplug tests: | |
49 | $ make -C tools/testing/selftests hotplug | |
50 | ||
51 | To run the hotplug tests: | |
52 | $ make -C tools/testing/selftests run_hotplug | |
53 | ||
54 | - note that some tests will require root privileges. | |
55 | ||
56 | ||
57 | Contributing new tests | |
58 | ====================== | |
59 | ||
60 | In general, the rules for for selftests are | |
61 | ||
62 | * Do as much as you can if you're not root; | |
63 | ||
64 | * Don't take too long; | |
65 | ||
66 | * Don't break the build on any architecture, and | |
67 | ||
68 | * Don't cause the top-level "make run_tests" to fail if your feature is | |
69 | unconfigured. |