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SubjectRe: [PATCH v2 1/4] perf trace-event-info: Add tracepoint_id_to_name() helper
On 11/05/23 10:51, Yang Jihong 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@huawei.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..a5c65cb02a28 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)
> +{
> + char *buf = NULL;
> + struct tracepoint_path *path = tracepoint_id_to_path(config);

It is considered slightly nicer to put local declarations
in descending order of line length. i.e.

struct tracepoint_path *path = tracepoint_id_to_path(config);
char *buf = NULL;

> +
> + if ((path != NULL) && (asprintf(&buf, "%s:%s", path->system, path->name) > 0))

The parentheses are unnecessary and kernel style tends to avoid "!= NULL"
i.e.

if (path && asprintf(&buf, "%s:%s", path->system, path->name) > 0)

> + return buf;
> +
> + 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;

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