perf daemon: Use control to stop session

Use the 'stop' control command to stop perf record session.  If that
fails, fall back to current SIGTERM/SIGKILL pair.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20210208200908.1019149-17-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-daemon.c

@@ -870,11 +870,25 @@ static int setup_client_socket(struct daemon *daemon)
 static void daemon_session__kill(struct daemon_session *session,
 				 struct daemon *daemon)
 {
+	int how = 0;
+
+	do {
+		switch (how) {
+		case 0:
+			daemon_session__control(session, "stop", false);
+			break;
+		case 1:
 			daemon_session__signal(session, SIGTERM);
-	if (daemon_session__wait(session, daemon, 10)) {
+			break;
+		case 2:
 			daemon_session__signal(session, SIGKILL);
-		daemon_session__wait(session, daemon, 10);
+			break;
+		default:
+			break;
 		}
+		how++;
+
+	} while (daemon_session__wait(session, daemon, 10));
 }
 
 static void daemon__signal(struct daemon *daemon, int sig)
@@ -899,13 +913,35 @@ static void daemon_session__remove(struct daemon_session *session)
 	daemon_session__delete(session);
 }
 
+static void daemon__stop(struct daemon *daemon)
+{
+	struct daemon_session *session;
+
+	list_for_each_entry(session, &daemon->sessions, list)
+		daemon_session__control(session, "stop", false);
+}
+
 static void daemon__kill(struct daemon *daemon)
 {
+	int how = 0;
+
+	do {
+		switch (how) {
+		case 0:
+			daemon__stop(daemon);
+			break;
+		case 1:
 			daemon__signal(daemon, SIGTERM);
-	if (daemon__wait(daemon, 10)) {
+			break;
+		case 2:
 			daemon__signal(daemon, SIGKILL);
-		daemon__wait(daemon, 10);
+			break;
+		default:
+			break;
 		}
+		how++;
+
+	} while (daemon__wait(daemon, 10));
 }
 
 static void daemon__exit(struct daemon *daemon)