From: Adrian Hunter <adrian.hun...@intel.com>
Add a function to determine whether an event can be
selected.
This function is needed to allow a tool to automatically
select additional events, but only if they are available.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
tools/perf/util/evlist.h | 2 ++
tools/perf/util/record.c | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 649d6ea..8a04aae 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -193,4 +193,6 @@ static inline void perf_mmap__write_tail(struct perf_mmap
*md,
pc->data_tail = tail;
}
+bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char
*str);
+
#endif /* __PERF_EVLIST_H */
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index c8845b1..e510453 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -177,3 +177,40 @@ int perf_record_opts__config(struct perf_record_opts *opts)
{
return perf_record_opts__config_freq(opts);
}
+
+bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
+{
+ struct perf_evlist *temp_evlist;
+ struct perf_evsel *evsel;
+ int err, fd, cpu;
+ bool ret = false;
+
+ temp_evlist = perf_evlist__new();
+ if (!temp_evlist)
+ return false;
+
+ err = parse_events(temp_evlist, str);
+ if (err)
+ goto out_delete;
+
+ evsel = perf_evlist__last(temp_evlist);
+
+ if (!evlist || cpu_map__empty(evlist->cpus)) {
+ struct cpu_map *cpus = cpu_map__new(NULL);
+
+ cpu = cpus ? cpus->map[0] : 0;
+ cpu_map__delete(cpus);
+ } else {
+ cpu = evlist->cpus->map[0];
+ }
+
+ fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
+ if (fd >= 0) {
+ close(fd);
+ ret = true;
+ }
+
+out_delete:
+ perf_evlist__delete(temp_evlist);
+ return ret;
+}
--
1.8.5.1
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