perf tools: Add stat event synthesize function

Introduce the perf_event__synthesize_stat function to synthesize a
'struct stat_event'.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-16-git-send-email-jolsa@kernel.org
[ Renamed 'stat' parameter to 'st' to fix 'already defined' build error with older distros (e.g. RHEL6.7) ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/builtin-test.c

@@ -191,6 +191,10 @@ static struct test generic_tests[] = {
 		.desc = "Test stat config synthesize",
 		.func = test__synthesize_stat_config,
 	},
+	{
+		.desc = "Test stat synthesize",
+		.func = test__synthesize_stat,
+	},
 	{
 		.func = NULL,
 	},

tools/perf/tests/stat.c

@@ -2,6 +2,7 @@
 #include "event.h"
 #include "tests.h"
 #include "stat.h"
+#include "counts.h"
 #include "debug.h"
 
 static bool has_term(struct stat_config_event *config,
@@ -18,10 +19,10 @@ static bool has_term(struct stat_config_event *config,
 	return false;
 }
 
-static int process_event(struct perf_tool *tool __maybe_unused,
-			 union perf_event *event,
-			 struct perf_sample *sample __maybe_unused,
-			 struct machine *machine __maybe_unused)
+static int process_stat_config_event(struct perf_tool *tool __maybe_unused,
+				     union perf_event *event,
+				     struct perf_sample *sample __maybe_unused,
+				     struct machine *machine __maybe_unused)
 {
 	struct stat_config_event *config = &event->stat_config;
 	struct perf_stat_config stat_config;
@@ -53,7 +54,37 @@ int test__synthesize_stat_config(int subtest __maybe_unused)
 	};
 
 	TEST_ASSERT_VAL("failed to synthesize stat_config",
-		!perf_event__synthesize_stat_config(NULL, &stat_config, process_event, NULL));
+		!perf_event__synthesize_stat_config(NULL, &stat_config, process_stat_config_event, NULL));
+
+	return 0;
+}
+
+static int process_stat_event(struct perf_tool *tool __maybe_unused,
+			      union perf_event *event,
+			      struct perf_sample *sample __maybe_unused,
+			      struct machine *machine __maybe_unused)
+{
+	struct stat_event *st = &event->stat;
+
+	TEST_ASSERT_VAL("wrong cpu",    st->cpu    == 1);
+	TEST_ASSERT_VAL("wrong thread", st->thread == 2);
+	TEST_ASSERT_VAL("wrong id",     st->id     == 3);
+	TEST_ASSERT_VAL("wrong val",    st->val    == 100);
+	TEST_ASSERT_VAL("wrong run",    st->ena    == 200);
+	TEST_ASSERT_VAL("wrong ena",    st->run    == 300);
+	return 0;
+}
+
+int test__synthesize_stat(int subtest __maybe_unused)
+{
+	struct perf_counts_values count;
+
+	count.val = 100;
+	count.ena = 200;
+	count.run = 300;
+
+	TEST_ASSERT_VAL("failed to synthesize stat_config",
+		!perf_event__synthesize_stat(NULL, 1, 2, 3, &count, process_stat_event, NULL));
 
 	return 0;
 }

tools/perf/tests/tests.h

@@ -82,6 +82,7 @@ int test_session_topology(int subtest);
 int test__thread_map_synthesize(int subtest);
 int test__cpu_map_synthesize(int subtest);
 int test__synthesize_stat_config(int subtest);
+int test__synthesize_stat(int subtest);
 
 #if defined(__arm__) || defined(__aarch64__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT

tools/perf/util/event.c

@@ -910,6 +910,28 @@ int perf_event__synthesize_stat_config(struct perf_tool *tool,
 	return err;
 }
 
+int perf_event__synthesize_stat(struct perf_tool *tool,
+				u32 cpu, u32 thread, u64 id,
+				struct perf_counts_values *count,
+				perf_event__handler_t process,
+				struct machine *machine)
+{
+	struct stat_event event;
+
+	event.header.type = PERF_RECORD_STAT;
+	event.header.size = sizeof(event);
+	event.header.misc = 0;
+
+	event.id        = id;
+	event.cpu       = cpu;
+	event.thread    = thread;
+	event.val       = count->val;
+	event.ena       = count->ena;
+	event.run       = count->run;
+
+	return process(tool, (union perf_event *) &event, NULL, machine);
+}
+
 void perf_event__read_stat_config(struct perf_stat_config *config,
 				  struct stat_config_event *event)
 {

tools/perf/util/event.h

@@ -466,6 +466,7 @@ struct perf_tool;
 struct thread_map;
 struct cpu_map;
 struct perf_stat_config;
+struct perf_counts_values;
 
 typedef int (*perf_event__handler_t)(struct perf_tool *tool,
 				     union perf_event *event,
@@ -498,7 +499,11 @@ int perf_event__synthesize_stat_config(struct perf_tool *tool,
 				       struct machine *machine);
 void perf_event__read_stat_config(struct perf_stat_config *config,
 				  struct stat_config_event *event);
-
+int perf_event__synthesize_stat(struct perf_tool *tool,
+				u32 cpu, u32 thread, u64 id,
+				struct perf_counts_values *count,
+				perf_event__handler_t process,
+				struct machine *machine);
 int perf_event__synthesize_modules(struct perf_tool *tool,
 				   perf_event__handler_t process,
 				   struct machine *machine);