rtla: fix cgroup and trace options parsing

This series fixes 2 issue in rtla timerlat and osnoise parsing.

1. Make -C/--cgroup option more user-friendly. Currently rtla timerlat and osnoise parses does not allow to specify tracer's threads cgroup name as -C [cgroup] or --cgroup [cgroup]. Second patch fixes this by allowing users to specify cgroup in the aforementioned manner.

2. When specifying -t/--trace before -a/--auto, trace filename is override to default <osnoise|timerlat>_trace.txt. For example, when running rtla as

rtla timerlat top -t custom_file.txt -a 100

when the threshold is reached, timerlat_trace.txt file is created instead of specified custom_file.txt. Third patch addresses this issue.

changes v4 -> v5:
- Removed setting trace_output before checking if it's NULL in fix -a overriding -t argument patch

changes v3 -> v4:
- Removed patch [1] as it has been mainlined
- Resolved merge conflicts with [2]

changes v2 -> v3:
- Combined common logic into a utility function to parse optional argument value
- Removed change that removed clear_terminal

changes v1 -> v2:
- Moved removing clear_terminal from fix -C/--cgroup interface patch to fix -a overriding -t argument patch
- Added clarification why to remove clear_terminal
- Added Fixes: tag to the fix -C/--cgroup interface patch

v4: https://lore.kernel.org/all/[email protected]/
v3: https://lore.kernel.org/all/[email protected]/
v2: https://lore.kernel.org/all/[email protected]/
v1: https://lore.kernel.org/all/[email protected]/

[1] https://lore.kernel.org/all/164ffc2ec8edacaf1295789dad82a07817b6263d.1757034919.git.ipravdin.official@gmail.com/
[2] https://patchwork.kernel.org/project/linux-trace-kernel/list/?series=999703

Ivan Pravdin (2):
rtla: fix -C/--cgroup interface
rtla: fix -a overriding -t argument

 Documentation/tools/rtla/common_options.rst |  2 +-
 tools/tracing/rtla/src/osnoise_hist.c       | 29 +++++++--------------
 tools/tracing/rtla/src/osnoise_top.c        | 29 +++++++--------------
 tools/tracing/rtla/src/timerlat_hist.c      | 29 +++++++--------------
 tools/tracing/rtla/src/timerlat_top.c       | 29 +++++++--------------
 tools/tracing/rtla/src/utils.c              | 26 ++++++++++++++++++
 tools/tracing/rtla/src/utils.h              |  1 +
 7 files changed, 64 insertions(+), 81 deletions(-)

2.48.1