Merge tag 'trace-tools-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull rtla trace tooling updates from Steven Rostedt:

- Officially add Tomas Glozar as a maintainer to RTLA tool

- Add for_each_monitored_cpu() helper

In multiple places, RTLA tools iterate over the list of CPUs running
tracer threads.

Use single helper instead of repeating the for/if combination.

- Remove unused variable option_index in argument parsing

RTLA tools use getopt_long() for argument parsing. For its last
argument, an unused variable "option_index" is passed.

Remove the variable and pass NULL to getopt_long() to shorten the
naturally long parsing functions, and make them more readable.

- Fix unassigned nr_cpus after code consolidation

In recent code consolidation, timerlat tool cleanup, previously
implemented separately for each tool, was moved to a common function
timerlat_free().

The cleanup relies on nr_cpus being set. This was not done in the new
function, leaving the variable uninitialized.

Initialize the variable properly, and remove silencing of compiler
warning for uninitialized variables.

- Stop tracing on user latency in BPF mode

Despite the name, rtla-timerlat's -T/--thread option sets timerlat's
stop_tracing_total_us option, which also stops tracing on
return-from-user latency, not only on thread latency.

Implement the same behavior also in BPF sample collection stop
tracing handler to avoid a discrepancy and restore correspondence of
behavior with the equivalent option of cyclictest.

- Fix threshold actions always triggering

A bug in threshold action logic caused the action to execute even if
tracing did not stop because of threshold.

Fix the logic to stop correctly.

- Fix few minor issues in tests

Extend tests that were shown to need it to 5s, fix osnoise test
calling timerlat by mistake, and use new, more reliable output
checking in timerlat's "top stop at failed action" test.

- Do not print usage on argument parsing error

RTLA prints the entire usage message on encountering errors in
argument parsing, like a malformed CPU list.

The usage message has gotten too long. Instead of printing it, use
newly added fatal() helper function to simply exit with the error
message, excluding the usage.

- Fix unintuitive -C/--cgroup interface

"-C cgroup" and "--cgroup cgroup" are invalid syntax, despite that
being a common way to specify an option with argument. Moreover,
using them fails silently and no cgroup is set.

Create new helper function to unify the handling of all such options
and allow all of:

-Xsomething
-X=something
-X something

as well as the equivalent for the long option.

- Fix -a overriding -t argument filename

Fix a bug where -a following -t custom_file.txt overrides the custom
filename with the default timerlat_trace.txt.

- Stop tracing correctly on multiple events at once

In some race scenarios, RTLA BPF sample collection might send
multiple stop tracing events via the BPF ringbuffer at once.

Compare the number of events for != 0 instead of == 1 to cover for
this scenario and stop tracing properly.

* tag 'trace-tools-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
rtla/timerlat: Exit top main loop on any non-zero wait_retval
rtla/tests: Don't rely on matching ^1ALL
rtla: Fix -a overriding -t argument
rtla: Fix -C/--cgroup interface
tools/rtla: Replace osnoise_hist_usage("...") with fatal("...")
tools/rtla: Replace osnoise_top_usage("...") with fatal("...")
tools/rtla: Replace timerlat_hist_usage("...") with fatal("...")
tools/rtla: Replace timerlat_top_usage("...") with fatal("...")
tools/rtla: Add fatal() and replace error handling pattern
rtla/tests: Fix osnoise test calling timerlat
rtla/tests: Extend action tests to 5s
tools/rtla: Fix --on-threshold always triggering
rtla/timerlat_bpf: Stop tracing on user latency
tools/rtla: Fix unassigned nr_cpus
tools/rtla: Remove unused optional option_index
tools/rtla: Add for_each_monitored_cpu() helper
MAINTAINERS: Add Tomas Glozar as a maintainer to RTLA tool