trace: Trace entry point of balloon request handler

Signed-off-by: NPrerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

balloon.c

@@ -29,6 +29,7 @@
 #include "cpu-common.h"
 #include "kvm.h"
 #include "balloon.h"
+#include "trace.h"
 
 
 static QEMUBalloonEvent *qemu_balloon_event;
@@ -43,6 +44,7 @@ void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
 int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
 {
     if (qemu_balloon_event) {
+        trace_balloon_event(qemu_balloon_event_opaque, target);
         qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
         return 1;
     } else {

trace-events

@@ -63,3 +63,7 @@ disable paio_submit(void *acb, void *opaque, unsigned long sector_num, unsigned
 # ioport.c
 disable cpu_in(unsigned int addr, unsigned int val) "addr %#x value %u"
 disable cpu_out(unsigned int addr, unsigned int val) "addr %#x value %u"
+
+# balloon.c
+# Since requests are raised via monitor, not many tracepoints are needed.
+disable balloon_event(void *opaque, unsigned long addr) "opaque %p addr %lu"