migration: add migrate_set_state tracepoint

Signed-off-by: Kazuya Saito <saito.kazuya@jp.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

migration.c

@@ -23,6 +23,7 @@
 #include "migration/block.h"
 #include "qemu/thread.h"
 #include "qmp-commands.h"
+#include "trace.h"
 
 //#define DEBUG_MIGRATION
 
@@ -282,13 +283,15 @@ void migrate_fd_error(MigrationState *s)
 {
     DPRINTF("setting error state\n");
     s->state = MIG_STATE_ERROR;
+    trace_migrate_set_state(MIG_STATE_ERROR);
     migrate_fd_cleanup(s);
 }
 
 static void migrate_fd_completed(MigrationState *s)
 {
     DPRINTF("setting completed state\n");
     s->state = MIG_STATE_COMPLETED;
+    trace_migrate_set_state(MIG_STATE_COMPLETED);
     migrate_fd_cleanup(s);
 }
 
@@ -319,6 +322,7 @@ static void migrate_fd_cancel(MigrationState *s)
     DPRINTF("cancelling migration\n");
 
     s->state = MIG_STATE_CANCELLED;
+    trace_migrate_set_state(MIG_STATE_CANCELLED);
     migrate_fd_cleanup(s);
 }
 
@@ -377,8 +381,9 @@ static MigrationState *migrate_init(const MigrationParams *params)
 
     s->bandwidth_limit = bandwidth_limit;
     s->state = MIG_STATE_SETUP;
-    s->total_time = qemu_get_clock_ms(rt_clock);
+    trace_migrate_set_state(MIG_STATE_SETUP);
 
+    s->total_time = qemu_get_clock_ms(rt_clock);
     return s;
 }
 
@@ -738,6 +743,8 @@ static const QEMUFileOps buffered_file_ops = {
 void migrate_fd_connect(MigrationState *s)
 {
     s->state = MIG_STATE_ACTIVE;
+    trace_migrate_set_state(MIG_STATE_ACTIVE);
+
     s->bytes_xfer = 0;
     s->buffer = NULL;
     s->buffer_size = 0;

trace-events

@@ -1091,3 +1091,6 @@ css_io_interrupt(int cssid, int ssid, int schid, uint32_t intparm, uint8_t isc,
 # hw/s390x/virtio-ccw.c
 virtio_ccw_interpret_ccw(int cssid, int ssid, int schid, int cmd_code) "VIRTIO-CCW: %x.%x.%04x: interpret command %x"
 virtio_ccw_new_device(int cssid, int ssid, int schid, int devno, const char *devno_mode) "VIRTIO-CCW: add subchannel %x.%x.%04x, devno %04x (%s)"
+
+# migration.c
+migrate_set_state(int new_state) "new state %d"