diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-05-17 19:22:37 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-05-17 19:25:07 +0200 |
| commit | c02cab228e44aacf161642b63779971f8e39993b (patch) | |
| tree | 21bb482dcc116bbbf4a4f89826b39aeeedc78119 /tools/perf/util/parse-events.c | |
| parent | tools lib api fs tracing_path: Introduce get/put_events_file() helpers (diff) | |
| download | linux-c02cab228e44aacf161642b63779971f8e39993b.tar.xz linux-c02cab228e44aacf161642b63779971f8e39993b.zip | |
perf tools: Reuse the path to the tracepoint /events/ directory
When using for_each_event() we needlessly rebuild the whole path to
the tracepoint directory, reuse the dir_path instead, saving some cycles
and reducing the size of the next patch.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-54bcs15n0cp6gwcgpc4hptyc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/parse-events.c')
| -rw-r--r-- | tools/perf/util/parse-events.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 2fc4ee8b86c1..f9d5bbd63484 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -156,13 +156,12 @@ struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = { (strcmp(sys_dirent->d_name, ".")) && \ (strcmp(sys_dirent->d_name, ".."))) -static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir) +static int tp_event_has_id(const char *dir_path, struct dirent *evt_dir) { char evt_path[MAXPATHLEN]; int fd; - snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", tracing_events_path, - sys_dir->d_name, evt_dir->d_name); + snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name); fd = open(evt_path, O_RDONLY); if (fd < 0) return -EINVAL; @@ -171,12 +170,12 @@ static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir) return 0; } -#define for_each_event(sys_dirent, evt_dir, evt_dirent) \ +#define for_each_event(dir_path, evt_dir, evt_dirent) \ while ((evt_dirent = readdir(evt_dir)) != NULL) \ if (evt_dirent->d_type == DT_DIR && \ (strcmp(evt_dirent->d_name, ".")) && \ (strcmp(evt_dirent->d_name, "..")) && \ - (!tp_event_has_id(sys_dirent, evt_dirent))) + (!tp_event_has_id(dir_path, evt_dirent))) #define MAX_EVENT_LENGTH 512 @@ -204,7 +203,7 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config) if (!evt_dir) continue; - for_each_event(sys_dirent, evt_dir, evt_dirent) { + for_each_event(dir_path, evt_dir, evt_dirent) { scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dirent->d_name); @@ -2119,7 +2118,7 @@ restart: if (!evt_dir) continue; - for_each_event(sys_dirent, evt_dir, evt_dirent) { + for_each_event(dir_path, evt_dir, evt_dirent) { if (event_glob != NULL && !strglobmatch(evt_dirent->d_name, event_glob)) continue; @@ -2199,7 +2198,7 @@ int is_valid_tracepoint(const char *event_string) if (!evt_dir) continue; - for_each_event(sys_dirent, evt_dir, evt_dirent) { + for_each_event(dir_path, evt_dir, evt_dirent) { snprintf(evt_path, MAXPATHLEN, "%s:%s", sys_dirent->d_name, evt_dirent->d_name); if (!strcmp(evt_path, event_string)) { |