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tools lib subcmd: Show parent options in help

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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>
This commit is contained in:
Namhyung Kim 2024-04-29 16:37:07 -07:00 committed by Arnaldo Carvalho de Melo
parent d9c5f5f94c
commit ea558c8624
1 changed files with 22 additions and 10 deletions
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28
tools/lib/subcmd/parse-options.c
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@ -808,18 +808,30 @@ static int option__cmp(const void *va, const void *vb)
static struct option *options__order(const struct option *opts)
{
int nr_opts = 0, nr_group = 0, len;
const struct option *o = opts;
struct option *opt, *ordered, *group;
int nr_opts = 0, nr_group = 0, nr_parent = 0, len;
const struct option *o, *p = opts;
struct option *opt, *ordered = NULL, *group;
for (o = opts; o->type != OPTION_END; o++)
/* flatten the options that have parents */
for (p = opts; p != NULL; p = o->parent) {
for (o = p; o->type != OPTION_END; o++)
++nr_opts;
len = sizeof(*o) * (nr_opts + 1);
ordered = malloc(len);
if (!ordered)
/*
* the length is given by the number of options plus a null
* terminator for the last loop iteration.
*/
len = sizeof(*o) * (nr_opts + !o->parent);
group = realloc(ordered, len);
if (!group)
goto out;
memcpy(ordered, opts, len);
ordered = group;
memcpy(&ordered[nr_parent], p, sizeof(*o) * (nr_opts - nr_parent));
nr_parent = nr_opts;
}
/* copy the last OPTION_END */
memcpy(&ordered[nr_opts], o, sizeof(*o));
/* sort each option group individually */
for (opt = group = ordered; opt->type != OPTION_END; opt++) {