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perf trace-event-info: Add tracepoint_id_to_name() helper

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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>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: anshuman.khandual@arm.com
Cc: mark.rutland@arm.com
Cc: irogers@google.com
Cc: jesussanp@google.com
Cc: peterz@infradead.org
Cc: acme@kernel.org
Cc: jolsa@kernel.org
Cc: alexander.shishkin@linux.intel.com
Cc: mingo@redhat.com
Link: https://lore.kernel.org/r/20230623054416.160858-2-yangjihong1@huawei.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Yang Jihong 2023-06-23 05:44:13 +00:00 committed by Namhyung Kim
parent d82257d7f6
commit 220f88b5a1
2 changed files with 18 additions and 0 deletions
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12
tools/perf/util/trace-event-info.c
View File

@ -466,6 +466,18 @@ next:
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)
buf = NULL;
put_tracepoints_path(path);
return buf;
}
static struct tracepoint_path *tracepoint_name_to_path(const char *name)
{
struct tracepoint_path *path = zalloc(sizeof(*path));

6
tools/perf/util/trace-event.h
View File

@ -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;