[Qemu-devel] [PATCH v2 1/1] monitor: improve tracing in handle_qmp_command

["Denis V. Lunev" <den@openvz.org>]

Calculate req_json only if trace_handle_qmp_command enabled.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Lluís Vilanova <vilanova@ac.upc.edu>
CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
---
Changes from v1:
- written in the explicit for, as discussed in the mailing list

 monitor.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/monitor.c b/monitor.c
index d8ac20f6ca..2bfeb9bbcc 100644
--- a/monitor.c
+++ b/monitor.c
@@ -3822,7 +3822,6 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens)
     QDict *qdict = NULL;
     Monitor *mon = cur_mon;
     Error *err = NULL;
-    QString *req_json;
 
     req = json_parser_parse_err(tokens, NULL, &err);
     if (!req && !err) {
@@ -3840,9 +3839,11 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens)
         qdict_del(qdict, "id");
     } /* else will fail qmp_dispatch() */
 
-    req_json = qobject_to_json(req);
-    trace_handle_qmp_command(mon, qstring_get_str(req_json));
-    qobject_decref(QOBJECT(req_json));
+    if (trace_event_get_state(TRACE_HANDLE_QMP_COMMAND)) {
+        QString *req_json = qobject_to_json(req);
+        trace_handle_qmp_command(mon, qstring_get_str(req_json));
+        qobject_decref(QOBJECT(req_json));
+    }
 
     rsp = qmp_dispatch(cur_mon->qmp.commands, req);
 
-- 
2.11.0