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Message-ID: <CAM9d7cjyVgJiVT4Lf+qGd+d2es6NcoN3H42onpN_t4Ed0JHgig@mail.gmail.com>
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
>
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