perf evsel: Introduce append_filter() method

[firefly-linux-kernel-4.4.55.git] / tools / perf / util / evsel.c

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index ae925b9ce6dd9f9693e172ee8246a87f4384f6a1..6cc97f37887dff1499c5c4420f60cb95a5d481b4 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -836,6 +836,23 @@ int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
        return -1;
 }
 
+int perf_evsel__append_filter(struct perf_evsel *evsel,
+                             const char *op, const char *filter)
+{
+       char *new_filter;
+
+       if (evsel->filter == NULL)
+               return perf_evsel__set_filter(evsel, filter);
+
+       if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
+               free(evsel->filter);
+               evsel->filter = new_filter;
+               return 0;
+       }
+
+       return -1;
+}
+
 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
 {
        return perf_evsel__run_ioctl(evsel, ncpus, nthreads,