[Qemu-devel] [PATCH 4/5] qdev: add qdev_{create,free} tracepoints

[Kazuya Saito <saito.kazuya@jp.fujitsu.com>]

This patch adds tracepoints at creating and removing virtual
devices. It is useful for investigation of trouble related to virtual
devices.

Signed-off-by: Kazuya Saito <saito.kazuya@jp.fujitsu.com>
---
 hw/qdev.c    |    3 +++
 trace-events |    4 ++++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/hw/qdev.c b/hw/qdev.c
index 0b20280..0fda23e 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -30,6 +30,7 @@
 #include "qapi/error.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/visitor.h"
+#include "trace.h"

 int qdev_hotplug = 0;
 static bool qdev_hot_added = false;
@@ -124,6 +125,7 @@ DeviceState *qdev_create(BusState *bus, const char *name)
         }
     }

+    trace_qdev_create(dev, dev->parent_bus);
     return dev;
 }

@@ -268,6 +270,7 @@ void qdev_init_nofail(DeviceState *dev)
 /* Unlink device from bus and free the structure.  */
 void qdev_free(DeviceState *dev)
 {
+    trace_qdev_free(dev, dev->parent_bus);
     object_unparent(OBJECT(dev));
 }

diff --git a/trace-events b/trace-events
index c691ce4..235b978 100644
--- a/trace-events
+++ b/trace-events
@@ -1102,3 +1102,7 @@ kvm_ioctl(int type) "type %d"
 kvm_vm_ioctl(int type) "type %d"
 kvm_vcpu_ioctl(int type) "type %d"
 kvm_run_exit(uint32_t reason) "reason %d"
+
+# qdev.c
+qdev_create(void *dev, void *bus) "dev %p, bus %p"
+qdev_free(void *dev, void *bus) "dev %p, bus %p"
-- 
1.7.1