ea558c86 | 30-Apr-2024 |
Namhyung Kim <namhyung@kernel.org> |
tools lib subcmd: Show parent options in help
I've just realized that help message in a subcommand didn't show one in the parent command. Since the option parser understands the parent, display cod
tools lib subcmd: Show parent options in help
I've just realized that help message in a subcommand didn't show one in the parent command. Since the option parser understands the parent, display code should do the same. For example, `perf ftrace latency -h` should show options in the `perf ftrace` command too.
Before:
$ perf ftrace latency -h
Usage: perf ftrace [<options>] [<command>] or: perf ftrace [<options>] -- [<command>] [<options>] or: perf ftrace {trace|latency} [<options>] [<command>] or: perf ftrace {trace|latency} [<options>] -- [<command>] [<options>]
-b, --use-bpf Use BPF to measure function latency -n, --use-nsec Use nano-second histogram -T, --trace-funcs <func> Show latency of given function
After:
$ perf ftrace latency -h
Usage: perf ftrace [<options>] [<command>] or: perf ftrace [<options>] -- [<command>] [<options>] or: perf ftrace {trace|latency} [<options>] [<command>] or: perf ftrace {trace|latency} [<options>] -- [<command>] [<options>]
-a, --all-cpus System-wide collection from all CPUs -b, --use-bpf Use BPF to measure function latency -C, --cpu <cpu> List of cpus to monitor -n, --use-nsec Use nano-second histogram -p, --pid <pid> Trace on existing process id -T, --trace-funcs <func> Show latency of given function -v, --verbose Be more verbose --tid <tid> Trace on existing thread id (exclusive to --pid)
Reviewed-by: Ian Rogers <irogers@google.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20240429233707.1511175-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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