[tip:perf/core] perf evsel: Introduce append_filter() method

[tip:perf/core] perf evsel: Introduce append_filter() method

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  64ec84f5f96ea1d043c01e32e49e45286c6f4160
Gitweb:     http://git.kernel.org/tip/64ec84f5f96ea1d043c01e32e49e45286c6f4160
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Sat, 4 Jul 2015 12:19:13 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 6 Jul 2015 08:57:51 -0300

perf evsel: Introduce append_filter() method

To allow building filters in evsel->filter, that will eventually be
applied via perf_evsel__apply_filter().

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-sjfoes3pycx7nlpmgedca13v@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/evsel.c | 17 +++++++++++++++++
 tools/perf/util/evsel.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index ae925b9..6cc97f3 100644
--- 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,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 8aea4ba..fe9f327 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -183,6 +183,8 @@ 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__append_filter(struct perf_evsel *evsel,
+			      const char *op, 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);