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======================
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Linux Kernel Selftests
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======================
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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 a 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 a user specified location::
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$ cd tools/testing/selftests
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$ ./kselftest_install.sh install_dir
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Running installed selftests
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===========================
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Kselftest install as well as the Kselftest tarball provide a script
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named "run_kselftest.sh" to run the tests.
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You can simply do the following to run the installed Kselftests. Please
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note some tests will require root privileges::
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$ cd kselftest
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$ ./run_kselftest.sh
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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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Contributing new tests (details)
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================================
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* Use TEST_GEN_XXX if such binaries or files are generated during
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compiling.
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TEST_PROGS, TEST_GEN_PROGS mean it is the excutable tested by
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default.
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TEST_PROGS_EXTENDED, TEST_GEN_PROGS_EXTENDED mean it is the
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executable which is not tested by default.
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TEST_FILES, TEST_GEN_FILES mean it is the file which is used by
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test.
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Test Harness
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============
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The kselftest_harness.h file contains useful helpers to build tests. The tests
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from tools/testing/selftests/seccomp/seccomp_bpf.c can be used as example.
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Example
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-------
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.. kernel-doc:: tools/testing/selftests/kselftest_harness.h
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:doc: example
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Helpers
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-------
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.. kernel-doc:: tools/testing/selftests/kselftest_harness.h
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:functions: TH_LOG TEST TEST_SIGNAL FIXTURE FIXTURE_DATA FIXTURE_SETUP
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FIXTURE_TEARDOWN TEST_F TEST_HARNESS_MAIN
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Operators
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---------
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.. kernel-doc:: tools/testing/selftests/kselftest_harness.h
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:doc: operators
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.. kernel-doc:: tools/testing/selftests/kselftest_harness.h
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:functions: ASSERT_EQ ASSERT_NE ASSERT_LT ASSERT_LE ASSERT_GT ASSERT_GE
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ASSERT_NULL ASSERT_TRUE ASSERT_NULL ASSERT_TRUE ASSERT_FALSE
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ASSERT_STREQ ASSERT_STRNE EXPECT_EQ EXPECT_NE EXPECT_LT
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EXPECT_LE EXPECT_GT EXPECT_GE EXPECT_NULL EXPECT_TRUE
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EXPECT_FALSE EXPECT_STREQ EXPECT_STRNE
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