[PATCH v14 15/19] trace-cmd: Add host trace clock as guest trace argument

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

When tracing host and guest machines, both should use the same
tracing clock for event timestamps. If a clock is specified
as host tracing argument, with option "-C clock_name", the same
is injected as guest tracing argument. If the user wants to use
different tracing clocks, it can specify it using "-C clock_name"
as guest tracing argument. In that case, the one specified by
the user has higher priority.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 tracecmd/trace-record.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 1d9ba3c..4f18283 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -5406,6 +5406,8 @@ static void parse_record_options(int argc,
 	char *sav;
 	int name_counter = 0;
 	int neg_event = 0;
+	struct buffer_instance *instance;
+	bool guest_config = false;
 
 	init_common_record_context(ctx, curr_cmd);
 
@@ -5563,6 +5565,7 @@ static void parse_record_options(int argc,
 			break;
 		case 'C':
 			ctx->instance->ftrace->clock = optarg;
+			guest_config = true;
 			break;
 		case 'v':
 			neg_event = 1;
@@ -5780,14 +5783,26 @@ static void parse_record_options(int argc,
 
 	/* If --date is specified, prepend it to all guest VM flags */
 	if (ctx->date) {
-		struct buffer_instance *instance;
-
 		for_all_instances(instance) {
 			if (is_guest(instance))
 				add_argv(instance, "--date", true);
 		}
 	}
 
+	if (guest_config) {
+		/* If -C is specified, prepend clock to all guest VM flags */
+		for_all_instances(instance) {
+			if (top_instance.ftrace->clock) {
+				if (is_guest(instance)) {
+					add_argv(instance,
+						 (char *)top_instance.ftrace->clock,
+						 true);
+					add_argv(instance, "-C", true);
+				}
+			}
+		}
+	}
+
 	if (!ctx->filtered && ctx->instance->filter_mod)
 		add_func(&ctx->instance->filter_funcs,
 			 ctx->instance->filter_mod, "*");
-- 
2.23.0