perf evsel: Cache associated event_format

We already lookup the associated event_format when reading the perf.data
header, so that we can cache the tracepoint name in evsel->name, so do
it a little further and save the event_format itself, so that we can
avoid relookups in tools that need to access it.

Change the tools to take the most obvious advantage, when they were
using pevent_find_event directly. More work is needed for further
removing the need of a pointer to pevent, such as when asking for event
field values ("common_pid" and the other common fields and per
event_format fields).

This is something that was planned but only got actually done when
Andrey Wagin needed to do this lookup at perf_tool->sample() time, when
we don't have access to pevent (session->pevent) to use with
pevent_find_event().

Cc: Andrey Wagin <avagin@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/n/tip-txkvew2ckko0b594ae8fbnyk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

6 files changed, 36 insertions, 28 deletions

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index b559929983bb..a56c4574b3fe 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -56,6 +56,7 @@ struct perf_evsel {
 	int			ids;
 	struct hists		hists;
 	char			*name;
+	struct event_format	*tp_format;
 	union {
 		void		*priv;
 		off_t		id_offset;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e2b4864bd11e..b2da439bce7a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2123,6 +2123,7 @@ static int perf_evsel__set_tracepoint_name(struct perf_evsel *evsel,
 	if (event->name == NULL)
 		return -1;
 
+	evsel->tp_format = event;
 	return 0;
 }
 
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index 02dfa19a467f..c26628116593 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -237,16 +237,16 @@ static void define_event_symbols(struct event_format *event,
 		define_event_symbols(event, ev_name, args->next);
 }
 
-static inline
-struct event_format *find_cache_event(struct pevent *pevent, int type)
+static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 {
 	static char ev_name[256];
 	struct event_format *event;
+	int type = evsel->attr.config;
 
 	if (events[type])
 		return events[type];
 
-	events[type] = event = pevent_find_event(pevent, type);
+	events[type] = event = evsel->tp_format;
 	if (!event)
 		return NULL;
 
@@ -269,7 +269,6 @@ static void perl_process_tracepoint(union perf_event *perf_event __unused,
 	unsigned long long val;
 	unsigned long s, ns;
 	struct event_format *event;
-	int type;
 	int pid;
 	int cpu = sample->cpu;
 	void *data = sample->raw_data;
@@ -281,11 +280,9 @@ static void perl_process_tracepoint(union perf_event *perf_event __unused,
 	if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
 		return;
 
-	type = trace_parse_common_type(pevent, data);
-
-	event = find_cache_event(pevent, type);
+	event = find_cache_event(evsel);
 	if (!event)
-		die("ug! no event found for type %d", type);
+		die("ug! no event found for type %d", evsel->attr.config);
 
 	pid = trace_parse_common_pid(pevent, data);
 
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index ce4d1b0c3862..8006978d8398 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -27,6 +27,7 @@
 #include <errno.h>
 
 #include "../../perf.h"
+#include "../evsel.h"
 #include "../util.h"
 #include "../event.h"
 #include "../thread.h"
@@ -194,16 +195,21 @@ static void define_event_symbols(struct event_format *event,
 		define_event_symbols(event, ev_name, args->next);
 }
 
-static inline
-struct event_format *find_cache_event(struct pevent *pevent, int type)
+static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 {
 	static char ev_name[256];
 	struct event_format *event;
+	int type = evsel->attr.config;
 
+	/*
+ 	 * XXX: Do we really need to cache this since now we have evsel->tp_format
+ 	 * cached already? Need to re-read this "cache" routine that as well calls
+ 	 * define_event_symbols() :-\
+ 	 */
 	if (events[type])
 		return events[type];
 
-	events[type] = event = pevent_find_event(pevent, type);
+	events[type] = event = evsel->tp_format;
 	if (!event)
 		return NULL;
 
@@ -217,7 +223,7 @@ struct event_format *find_cache_event(struct pevent *pevent, int type)
 static void python_process_event(union perf_event *perf_event __unused,
 				 struct pevent *pevent,
 				 struct perf_sample *sample,
-				 struct perf_evsel *evsel __unused,
+				 struct perf_evsel *evsel,
 				 struct machine *machine __unused,
 				 struct thread *thread)
 {
@@ -228,7 +234,6 @@ static void python_process_event(union perf_event *perf_event __unused,
 	unsigned long s, ns;
 	struct event_format *event;
 	unsigned n = 0;
-	int type;
 	int pid;
 	int cpu = sample->cpu;
 	void *data = sample->raw_data;
@@ -239,11 +244,9 @@ static void python_process_event(union perf_event *perf_event __unused,
 	if (!t)
 		Py_FatalError("couldn't create Python tuple");
 
-	type = trace_parse_common_type(pevent, data);
-
-	event = find_cache_event(pevent, type);
+	event = find_cache_event(evsel);
 	if (!event)
-		die("ug! no event found for type %d", type);
+		die("ug! no event found for type %d", (int)evsel->attr.config);
 
 	pid = trace_parse_common_pid(pevent, data);
 
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 0715c843c2e7..12088348ac02 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -167,20 +167,11 @@ unsigned long long read_size(struct pevent *pevent, void *ptr, int size)
 	return pevent_read_number(pevent, ptr, size);
 }
 
-void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
+void event_format__print(struct event_format *event,
+			 int cpu, void *data, int size)
 {
-	struct event_format *event;
 	struct pevent_record record;
 	struct trace_seq s;
-	int type;
-
-	type = trace_parse_common_type(pevent, data);
-
-	event = pevent_find_event(pevent, type);
-	if (!event) {
-		warning("ug! no event found for type %d", type);
-		return;
-	}
 
 	memset(&record, 0, sizeof(record));
 	record.cpu = cpu;
@@ -192,6 +183,19 @@ void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
 	trace_seq_do_printf(&s);
 }
 
+void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
+{
+	int type = trace_parse_common_type(pevent, data);
+	struct event_format *event = pevent_find_event(pevent, type);
+
+	if (!event) {
+		warning("ug! no event found for type %d", type);
+		return;
+	}
+
+	event_format__print(event, cpu, data, size);
+}
+
 void print_event(struct pevent *pevent, int cpu, void *data, int size,
 		 unsigned long long nsecs, char *comm)
 {
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 8fef1d6687b7..069d105e0fc0 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -32,6 +32,8 @@ int bigendian(void);
 
 struct pevent *read_trace_init(int file_bigendian, int host_bigendian);
 void print_trace_event(struct pevent *pevent, int cpu, void *data, int size);
+void event_format__print(struct event_format *event,
+			 int cpu, void *data, int size);
 
 void print_event(struct pevent *pevent, int cpu, void *data, int size,
 		 unsigned long long nsecs, char *comm);