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| author | Namhyung Kim <namhyung@kernel.org> | 2024-04-29 16:37:07 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2024-05-12 21:09:52 -0300 |
| commit | ea558c86248b4955e5c5f3c0c921df450880605e (patch) | |
| tree | 156c03a9f1da0c3b7ff5952fca1ebf0eb5d04ca2 /mm/slab_common.c | |
| parent | d9c5f5f94c2d356fdf3503f7fcaf254512bc032d (diff) | |
| download | linux-ea558c86248b4955e5c5f3c0c921df450880605e.tar.gz linux-ea558c86248b4955e5c5f3c0c921df450880605e.tar.bz2 linux-ea558c86248b4955e5c5f3c0c921df450880605e.zip | |
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>
Diffstat (limited to 'mm/slab_common.c')
0 files changed, 0 insertions, 0 deletions