Add the following functions:
perf_evsel__has_fd
to check for perf events with the file descriptor specified in the
argument.
This function can be used in signal handlers to check overflow.
Signed-off-by: Shunsuke Nakamura <[email protected]>
---
tools/lib/perf/Documentation/libperf.txt | 1 +
tools/lib/perf/evsel.c | 18 ++++++++++++++++++
tools/lib/perf/include/perf/evsel.h | 1 +
tools/lib/perf/libperf.map | 1 +
4 files changed, 21 insertions(+)
diff --git a/tools/lib/perf/Documentation/libperf.txt b/tools/lib/perf/Documentation/libperf.txt
index ec93b1c75ebe..bc7881348c76 100644
--- a/tools/lib/perf/Documentation/libperf.txt
+++ b/tools/lib/perf/Documentation/libperf.txt
@@ -161,6 +161,7 @@ SYNOPSIS
int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
int perf_evsel__disable(struct perf_evsel *evsel);
int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
+ bool perf_evsel__has_fd(struct perf_evsel *evsel, int fd);
struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel);
struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel);
struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel);
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
index a289f6c44d7c..446934c0e5e5 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -556,3 +556,21 @@ int perf_evsel__open_opts(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
return err;
}
+
+bool perf_evsel__has_fd(struct perf_evsel *evsel, int fd)
+{
+ int cpu_map_idx;
+ int thread;
+ int *evsel_fd;
+
+ for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->fd); ++cpu_map_idx) {
+ for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
+ evsel_fd = FD(evsel, cpu_map_idx, thread);
+
+ if (fd == *evsel_fd)
+ return true;
+ }
+ }
+
+ return false;
+}
diff --git a/tools/lib/perf/include/perf/evsel.h b/tools/lib/perf/include/perf/evsel.h
index 50662babfe97..19a7993d9021 100644
--- a/tools/lib/perf/include/perf/evsel.h
+++ b/tools/lib/perf/include/perf/evsel.h
@@ -69,5 +69,6 @@ LIBPERF_API int perf_evsel__open_opts(struct perf_evsel *evsel,
struct perf_cpu_map *cpus,
struct perf_thread_map *threads,
struct perf_evsel_open_opts *opts);
+LIBPERF_API bool perf_evsel__has_fd(struct perf_evsel *evsel, int fd);
#endif /* __LIBPERF_EVSEL_H */
diff --git a/tools/lib/perf/libperf.map b/tools/lib/perf/libperf.map
index eeeb3075e092..b2ace16bbc32 100644
--- a/tools/lib/perf/libperf.map
+++ b/tools/lib/perf/libperf.map
@@ -34,6 +34,7 @@ LIBPERF_0.0.1 {
perf_evsel__cpus;
perf_evsel__threads;
perf_evsel__attr;
+ perf_evsel__has_fd;
perf_evlist__new;
perf_evlist__delete;
perf_evlist__open;
--
2.25.1