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SubjectRe: [PATCH] perf debug: List available options when no variable is specified
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Hello,

On 2023/10/31 23:42, Arnaldo Carvalho de Melo wrote:
> Em Tue, Oct 31, 2023 at 08:08:23AM +0000, Yang Jihong escreveu:
>> Before:
>
>> # perf --debug
>> No variable specified for --debug.
>
>> After:
>
>> # perf --debug
>> No variable specified for --debug, available options: verbose,ordered-events,stderr,data-convert,perf-event-open.
>
> Looks useful, but the implementation can be different to reduce
> maintainership costs, see below:
>
>> +++ b/tools/perf/perf.c
>> @@ -279,7 +279,9 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
>> } else if (!strcmp(cmd, "--debug")) {
>> if (*argc < 2) {
>> - fprintf(stderr, "No variable specified for --debug.\n");
>> + fprintf(stderr,
>> + "No variable specified for --debug, available options: %s.\n",
>> + perf_debug_options_string);
>> usage(perf_usage_string);
>
>> +++ b/tools/perf/util/debug.c
>> @@ -215,6 +215,9 @@ void trace_event(union perf_event *event)
>> trace_event_printer, event);
>> }
>>
>> +const char perf_debug_options_string[] =
>> + "verbose,ordered-events,stderr,data-convert,perf-event-open";
>
> Instead of adding a new variable that has to be kept in sync with
> debug_opts[], you could provide a function that iterates debug_opts,
> printing its options names, then use that function on perf.c handle_options.

Thanks for the advice.
OK, will send a v2 patch according to this scheme.

Thanks,
Yang

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