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No new features this release. Mostly clean ups, restructuring and documentation. - Have ftrace_bug() show ftrace errors before the WARN, as the WARN will reboot the box before the error messages are printed if panic_on_warn is set. - Have traceoff_on_warn disable tracing sooner (before prints) - Write a message to the trace buffer that its being disabled when disable_trace_on_warning() is set. - Separate out synthetic events from histogram code to let it be used by other parts of the kernel. - More documentation on histogram design. - Other small fixes and clean ups. -----BEGIN PGP SIGNATURE----- iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCXt+LEhQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qj2zAP9sD/W4jafYayucj+MvRP7sy+Q0iAH7 WMn8fkk958cgfQD8D1QFtkkx+3O3TRT6ApGf11w5+JgSWUE2gSbW9H4fPQk= =X5t4 -----END PGP SIGNATURE----- Merge tag 'trace-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing updates from Steven Rostedt: "No new features this release. Mostly clean ups, restructuring and documentation. - Have ftrace_bug() show ftrace errors before the WARN, as the WARN will reboot the box before the error messages are printed if panic_on_warn is set. - Have traceoff_on_warn disable tracing sooner (before prints) - Write a message to the trace buffer that its being disabled when disable_trace_on_warning() is set. - Separate out synthetic events from histogram code to let it be used by other parts of the kernel. - More documentation on histogram design. - Other small fixes and clean ups" * tag 'trace-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Remove obsolete PREEMPTIRQ_EVENTS kconfig option tracing/doc: Fix ascii-art in histogram-design.rst tracing: Add a trace print when traceoff_on_warning is triggered ftrace,bug: Improve traceoff_on_warn selftests/ftrace: Distinguish between hist and synthetic event checks tracing: Move synthetic events to a separate file tracing: Fix events.rst section numbering tracing/doc: Fix typos in histogram-design.rst tracing: Add hist_debug trace event files for histogram debugging tracing: Add histogram-design document tracing: Check state.disabled in synth event trace functions tracing/probe: reverse arguments to list_add tools/bootconfig: Add a summary of test cases and return error ftrace: show debugging information when panic_on_warn set |
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Linux Ftrace Testcases This is a collection of testcases for ftrace tracing feature in the Linux kernel. Since ftrace exports interfaces via the debugfs, we just need shell scripts for testing. Feel free to add new test cases. Running the ftrace testcases ============================ At first, you need to be the root user to run this script. To run all testcases: $ sudo ./ftracetest To run specific testcases: # ./ftracetest test.d/basic3.tc Or you can also run testcases under given directory: # ./ftracetest test.d/kprobe/ Contributing new testcases ========================== Copy test.d/template to your testcase (whose filename must have *.tc extension) and rewrite the test description line. * The working directory of the script is <debugfs>/tracing/. * Take care with side effects as the tests are run with root privilege. * The tests should not run for a long period of time (more than 1 min.) These are to be unit tests. * You can add a directory for your testcases under test.d/ if needed. * The test cases should run on dash (busybox shell) for testing on minimal cross-build environments. * Note that the tests are run with "set -e" (errexit) option. If any command fails, the test will be terminated immediately. * The tests can return some result codes instead of pass or fail by using exit_unresolved, exit_untested, exit_unsupported and exit_xfail. Result code =========== Ftracetest supports following result codes. * PASS: The test succeeded as expected. The test which exits with 0 is counted as passed test. * FAIL: The test failed, but was expected to succeed. The test which exits with !0 is counted as failed test. * UNRESOLVED: The test produced unclear or intermidiate results. for example, the test was interrupted or the test depends on a previous test, which failed. or the test was set up incorrectly The test which is in above situation, must call exit_unresolved. * UNTESTED: The test was not run, currently just a placeholder. In this case, the test must call exit_untested. * UNSUPPORTED: The test failed because of lack of feature. In this case, the test must call exit_unsupported. * XFAIL: The test failed, and was expected to fail. To return XFAIL, call exit_xfail from the test. There are some sample test scripts for result code under samples/. You can also run samples as below: # ./ftracetest samples/ TODO ==== * Fancy colored output :)