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- Add "onchange(var)" histogram handler that executes a action when $var changes. - Add new "snapshot()" action for histogram handlers, that causes a snapshot of the ring buffer when triggered. ie. onchange(var).snapshot() will trigger a snapshot if var changes. - Add alternative for "trace()" action. Currently, to trigger a synthetic event, the name of that event is used as the handler name, which is inconsistent with the other actions. onchange(var).synthetic(param) where it can now be onchange(var).trace(synthetic, param). The older method will still be allowed, as long as the synthetic events do not overlap with other handler names. - The histogram documentation at testcases were updated for the new changes. Added a quicker way to enable set_ftrace_filter files, that will make it much quicker to bisect tracing a function that shouldn't be traced and crashes the kernel. (You can echo in numbers to set_ftrace_filter, and it will select the corresponding function that is in available_filter_functions). Some better displaying of the tracing data (and more information was added). The rest are small fixes and more clean ups to the code. -----BEGIN PGP SIGNATURE----- iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCXIXXjRQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qrSJAQCbGXAvZE+shfKRhbU1cu1C1nwRMHhH eeRecJs1RChGFgD/TwatD4FzARQPjfk7snQD5KWPpoRc9grUACC2cZcaWwQ= =LVBI -----END PGP SIGNATURE----- Merge tag 'trace-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing updates from Steven Rostedt: "The biggest change for this release is in the histogram code: - Add "onchange(var)" histogram handler that executes a action when $var changes. - Add new "snapshot()" action for histogram handlers, that causes a snapshot of the ring buffer when triggered. ie. onchange(var).snapshot() will trigger a snapshot if var changes. - Add alternative for "trace()" action. Currently, to trigger a synthetic event, the name of that event is used as the handler name, which is inconsistent with the other actions. onchange(var).synthetic(param) where it can now be onchange(var).trace(synthetic, param). The older method will still be allowed, as long as the synthetic events do not overlap with other handler names. - The histogram documentation at testcases were updated for the new changes. Outside of the histogram code, we have: - Added a quicker way to enable set_ftrace_filter files, that will make it much quicker to bisect tracing a function that shouldn't be traced and crashes the kernel. (You can echo in numbers to set_ftrace_filter, and it will select the corresponding function that is in available_filter_functions). - Some better displaying of the tracing data (and more information was added). The rest are small fixes and more clean ups to the code" * tag 'trace-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (37 commits) tracing: Use strncpy instead of memcpy when copying comm in trace.c tracing: Use strncpy instead of memcpy when copying comm for hist triggers tracing: Use strncpy instead of memcpy for string keys in hist triggers tracing: Use str_has_prefix() in synth_event_create() x86/ftrace: Fix warning and considate ftrace_jmp_replace() and ftrace_call_replace() tracing/perf: Use strndup_user() instead of buggy open-coded version doc: trace: Fix documentation for uprobe_profile tracing: Fix spelling mistake: "analagous" -> "analogous" tracing: Comment why cond_snapshot is checked outside of max_lock protection tracing: Add hist trigger action 'expected fail' test case tracing: Add alternative synthetic event trace action test case tracing: Add hist trigger onchange() handler test case tracing: Add hist trigger snapshot() action test case tracing: Add SPDX license GPL-2.0 license identifier to inter-event testcases tracing: Add alternative synthetic event trace action syntax tracing: Add hist trigger onchange() handler Documentation tracing: Add hist trigger onchange() handler tracing: Add hist trigger snapshot() action Documentation tracing: Add hist trigger snapshot() action tracing: Add conditional snapshot ... |
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ftracetest | ||
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README |
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 :)