perf evsel: Introduce set_filter method

Replaces existing filter string with the one provided.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-jst49z83li0yx3g18o54u51a@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 15 insertions, 2 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 667677495fb0..ae925b9ce6dd 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -823,6 +823,19 @@ int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
                                      (void *)filter);
 }
 
+int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
+{
+        char *new_filter = strdup(filter);
+
+        if (new_filter != NULL) {
+                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,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index a3ebb83d767e..8aea4baca080 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -182,6 +182,7 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
                                bool use_sample_identifier);
 
+int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter);
 int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
                              const char *filter);
 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 09f8d2357108..a71eeb279ed2 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1177,8 +1177,7 @@ int parse_filter(const struct option *opt, const char *str,
                 return -1;
         }
 
-        last->filter = strdup(str);
-        if (last->filter == NULL) {
+        if (perf_evsel__set_filter(last, str) < 0) {
                 fprintf(stderr, "not enough memory to hold filter string\n");
                 return -1;
         }