linux/tools/tracing/rtla/tests, branch master

tools/rtla: Consolidate nr_cpus usage across all tools

2026-03-09T07:49:16Z

sysconf(_SC_NPROCESSORS_CONF) (via get_nprocs_conf) reflects cpu_possible_mask, which is fixed at boot time, so querying it repeatedly is unnecessary. Replace multiple calls to sysconf(_SC_NPROCESSORS_CONF) with a single global nr_cpus variable initialized once at startup. `#pragma once` in timerlat_u.h is needed for pre-C23 compilers to avoid redefinition errors. Signed-off-by: Costa Shulyupin Link: https://lore.kernel.org/r/20260306194953.2511960-2-costa.shul@redhat.com Signed-off-by: Tomas Glozar

tools/rtla: Add unit tests for utils.c

2026-03-04T14:51:56Z

Add unit tests for utility functions in src/utils.c using the Check testing framework. The tests verify parse_cpu_set(), strtoi(), and parse_prio() functions. Unit tests are built conditionally when libcheck is available. Run tests with 'make unit-test'. The test framework uses the Check library which provides process isolation for each test, preventing failures in one test from affecting others. Signed-off-by: Costa Shulyupin Link: https://lore.kernel.org/r/20260119105857.797498-3-costa.shul@redhat.com Signed-off-by: Tomas Glozar

rtla/tests: Run Test::Harness in verbose mode

2026-01-07T14:57:16Z

Add -v flag to prove command to also print the names of tests that succeeded, not only those that failed, to allow easier debugging of the test suite. Also, drop printing the option and value to stdout in check_with_osnoise_options, which was a debugging print that was accidentally left in the final commit, and which would be otherwise now visible in make check output, as stdout is no longer suppressed. Suggested-by: Crystal Wood Reviewed-by: Wander Lairson Costa Link: https://lore.kernel.org/r/20251126144205.331954-6-tglozar@redhat.com Signed-off-by: Tomas Glozar

rtla/tests: Test BPF action program

2026-01-07T14:57:16Z

Add a test that implements a BPF program writing to a test map, which is attached to RTLA via --bpf-action to be executed on theshold overflow. A combination of --on-threshold shell with bpftool (which is always present if BPF support is enabled) is used to check whether the BPF program has executed successfully. Suggested-by: Crystal Wood Link: https://lore.kernel.org/r/20251126144205.331954-5-tglozar@redhat.com Signed-off-by: Tomas Glozar

rtla/tests: Don't rely on matching ^1ALL

2025-11-21T09:30:27Z

The timerlat "top stop at failed action" test was relying on "ALL" being printed immediately after the "1" from the threshold action. Besides being fragile, this depends on stdbuf behavior, which is easy to miss when recreating the test outside of the framework for debugging purposes. Instead, use the expected/unexpected text mechanism from the corresponding osnoise test. Signed-off-by: Crystal Wood Link: https://lore.kernel.org/r/20251112152529.956778-2-crwood@redhat.com Signed-off-by: Tomas Glozar

rtla/tests: Fix osnoise test calling timerlat

2025-11-21T09:30:00Z

osnoise test "top stop at failed action" is calling timerlat instead of osnoise by mistake. Fix it so that it calls the correct RTLA subcommand. Fixes: 05b7e10687c6 ("tools/rtla: Add remaining support for osnoise actions") Reviewed-by: Wander Lairson Costa Link: https://lore.kernel.org/r/20251007095341.186923-3-tglozar@redhat.com Signed-off-by: Tomas Glozar

rtla/tests: Extend action tests to 5s

2025-11-21T09:29:01Z

In non-BPF mode, it takes up to 1 second for RTLA to notice that tracing has been stopped. That means that action tests cannot have a 1 second duration, as the SIGALRM will be racing with the threshold overflow. Previously, non-BPF mode actions were buggy and always executed the action, even when stopping on duration or SIGINT, preventing this issue from manifesting. Now that this has been fixed, the tests have become flaky, and this has to be adjusted. Fixes: 4e26f84abfbb ("rtla/tests: Add tests for actions") Fixes: 05b7e10687c6 ("tools/rtla: Add remaining support for osnoise actions") Reviewed-by: Wander Lairson Costa Link: https://lore.kernel.org/r/20251007095341.186923-2-tglozar@redhat.com Signed-off-by: Tomas Glozar

tools/rtla: Add remaining support for osnoise actions

2025-09-27T08:53:48Z

The basic functionality came with the consolidation; now hook up the command line options, and add documentation and tests. Cc: John Kacur Cc: Costa Shulyupin Link: https://lore.kernel.org/20250907022325.243930-8-crwood@redhat.com Reviewed-by: Tomas Glozar Signed-off-by: Crystal Wood Signed-off-by: Steven Rostedt (Google)

tools/rtla: Add test engine support for unexpected output

2025-09-27T08:53:21Z

Add a check() parameter to indicate which text must not appear in the output. Simplify the code so that we can print failures as they happen rather than trying to figure out what went wrong after printing "not ok". This also means that "not ok" gets printed after the info rather than before, which seems more intuitive anyway. Cc: John Kacur Cc: Costa Shulyupin Link: https://lore.kernel.org/20250907022325.243930-7-crwood@redhat.com Reviewed-by: Tomas Glozar Signed-off-by: Crystal Wood Signed-off-by: Steven Rostedt (Google)

tools/rtla: Fix -A option name in test comment

2025-09-27T08:53:07Z

This was changed to --on-threshold when the patches were applied. Cc: John Kacur Cc: Costa Shulyupin Link: https://lore.kernel.org/20250907022325.243930-6-crwood@redhat.com Reviewed-by: Tomas Glozar Signed-off-by: Crystal Wood Signed-off-by: Steven Rostedt (Google)