linux-kernel - Re: [PATCH RESEND v4 1/4] perf trace-event-info: Add tracepoint_id_to

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Date:   Tue, 20 Jun 2023 15:35:25 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Yang Jihong <yangjihong1@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        anshuman.khandual@....com, jesussanp@...gle.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v4 1/4] perf trace-event-info: Add
 tracepoint_id_to_name() helper

Hello,

On Mon, Jun 12, 2023 at 8:41 PM Yang Jihong <yangjihong1@...wei.com> wrote:
>
> Add tracepoint_id_to_name() helper to search for the trace events directory
> by given event id and return the corresponding tracepoint.
>
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/trace-event-info.c | 11 +++++++++++
>  tools/perf/util/trace-event.h      |  6 ++++++
>  2 files changed, 17 insertions(+)
>
> diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
> index c24b3a15e319..a7901f4a6654 100644
> --- a/tools/perf/util/trace-event-info.c
> +++ b/tools/perf/util/trace-event-info.c
> @@ -466,6 +466,17 @@ static struct tracepoint_path *tracepoint_id_to_path(u64 config)
>         return NULL;
>  }
>
> +char *tracepoint_id_to_name(u64 config)
> +{
> +       struct tracepoint_path *path = tracepoint_id_to_path(config);
> +       char *buf = NULL;
> +
> +       if (path && asprintf(&buf, "%s:%s", path->system, path->name) > 0)
> +               return buf;

I think we need to call put_tracepoints_path() before return.

Thanks,
Namhyung


> +
> +       return NULL;
> +}
> +
>  static struct tracepoint_path *tracepoint_name_to_path(const char *name)
>  {
>         struct tracepoint_path *path = zalloc(sizeof(*path));
> diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
> index a0cff184b1cd..a69ee29419f3 100644
> --- a/tools/perf/util/trace-event.h
> +++ b/tools/perf/util/trace-event.h
> @@ -62,6 +62,12 @@ unsigned long long eval_flag(const char *flag);
>
>  int read_tracing_data(int fd, struct list_head *pattrs);
>
> +/*
> + * Return the tracepoint name in the format "subsystem:event_name",
> + * callers should free the returned string.
> + */
> +char *tracepoint_id_to_name(u64 config);
> +
>  struct tracing_data {
>         /* size is only valid if temp is 'true' */
>         ssize_t size;
> --
> 2.30.GIT
>