[tip:perf/core] perf tools: Add all matching dynamic sort keys for field name

[tip-bot for Namhyung Kim]

Commit-ID:  9735be24ec086fbccee321471cc21dedefa956a6
Gitweb:     http://git.kernel.org/tip/9735be24ec086fbccee321471cc21dedefa956a6
Author:     Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate: Tue, 5 Jan 2016 19:58:35 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 6 Jan 2016 20:11:14 -0300

perf tools: Add all matching dynamic sort keys for field name

When a perf.data file has multiple events, it's likely to be similar
(tracepoint) events.  In that case, they might have same field name so
add all of them to sort keys instead of bailing out.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1451991518-25673-2-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/sort.c | 48 ++++++++++++++++++++++++++++++++----------------
 1 file changed, 32 insertions(+), 16 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 4b4b1c5..04e2a5c 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -1863,10 +1863,9 @@ static int parse_field_name(char *str, char **event, char **field, char **opt)
 }
 
 /* find match evsel using a given event name.  The event name can be:
- *   1. NULL - only valid for single event session
- *   2. '%' + event index (e.g. '%1' for first event)
- *   3. full event name (e.g. sched:sched_switch)
- *   4. partial event name (should not contain ':')
+ *   1. '%' + event index (e.g. '%1' for first event)
+ *   2. full event name (e.g. sched:sched_switch)
+ *   3. partial event name (should not contain ':')
  */
 static struct perf_evsel *find_evsel(struct perf_evlist *evlist, char *event_name)
 {
@@ -1875,16 +1874,6 @@ static struct perf_evsel *find_evsel(struct perf_evlist *evlist, char *event_nam
 	bool full_name;
 
 	/* case 1 */
-	if (event_name == NULL) {
-		if (evlist->nr_entries != 1) {
-			pr_debug("event name should be given\n");
-			return NULL;
-		}
-
-		return perf_evlist__first(evlist);
-	}
-
-	/* case 2 */
 	if (event_name[0] == '%') {
 		int nr = strtol(event_name+1, NULL, 0);
 
@@ -1900,10 +1889,10 @@ static struct perf_evsel *find_evsel(struct perf_evlist *evlist, char *event_nam
 
 	full_name = !!strchr(event_name, ':');
 	evlist__for_each(evlist, pos) {
-		/* case 3 */
+		/* case 2 */
 		if (full_name && !strcmp(pos->name, event_name))
 			return pos;
-		/* case 4 */
+		/* case 3 */
 		if (!full_name && strstr(pos->name, event_name)) {
 			if (evsel) {
 				pr_debug("'%s' event is ambiguous: it can be %s or %s\n",
@@ -1965,6 +1954,28 @@ static int add_all_dynamic_fields(struct perf_evlist *evlist, bool raw_trace)
 	return 0;
 }
 
+static int add_all_matching_fields(struct perf_evlist *evlist,
+				   char *field_name, bool raw_trace)
+{
+	int ret = -ESRCH;
+	struct perf_evsel *evsel;
+	struct format_field *field;
+
+	evlist__for_each(evlist, evsel) {
+		if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
+			continue;
+
+		field = pevent_find_any_field(evsel->tp_format, field_name);
+		if (field == NULL)
+			continue;
+
+		ret = __dynamic_dimension__add(evsel, field, raw_trace);
+		if (ret < 0)
+			break;
+	}
+	return ret;
+}
+
 static int add_dynamic_entry(struct perf_evlist *evlist, const char *tok)
 {
 	char *str, *event_name, *field_name, *opt_name;
@@ -1999,6 +2010,11 @@ static int add_dynamic_entry(struct perf_evlist *evlist, const char *tok)
 		goto out;
 	}
 
+	if (event_name == NULL) {
+		ret = add_all_matching_fields(evlist, field_name, raw_trace);
+		goto out;
+	}
+
 	evsel = find_evsel(evlist, event_name);
 	if (evsel == NULL) {
 		pr_debug("Cannot find event: %s\n", event_name);