migration: add more traces

This replaces DPRINTF macro with tracepoints.

This moves some messages from migration.c to savevm.c.

This adds tracepoint to signal about fileds failed to migrate.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>

migration.c

@@ -26,16 +26,6 @@
 #include "qmp-commands.h"
 #include "trace.h"
 
-//#define DEBUG_MIGRATION
-
-#ifdef DEBUG_MIGRATION
-#define DPRINTF(fmt, ...) \
-    do { printf("migration: " fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
-    do { } while (0)
-#endif
-
 enum {
     MIG_STATE_ERROR = -1,
     MIG_STATE_NONE,
@@ -112,7 +102,6 @@ static void process_incoming_migration_co(void *opaque)
         exit(EXIT_FAILURE);
     }
     qemu_announce_self();
-    DPRINTF("successfully loaded vm state\n");
 
     bdrv_clear_incoming_migration_all();
     /* Make sure all file formats flush their mutable metadata */
@@ -306,7 +295,7 @@ static void migrate_fd_cleanup(void *opaque)
     s->cleanup_bh = NULL;
 
     if (s->file) {
-        DPRINTF("closing file\n");
+        trace_migrate_fd_cleanup();
         qemu_mutex_unlock_iothread();
         qemu_thread_join(&s->thread);
         qemu_mutex_lock_iothread();
@@ -329,7 +318,7 @@ static void migrate_fd_cleanup(void *opaque)
 
 void migrate_fd_error(MigrationState *s)
 {
-    DPRINTF("setting error state\n");
+    trace_migrate_fd_error();
     assert(s->file == NULL);
     s->state = MIG_STATE_ERROR;
     trace_migrate_set_state(MIG_STATE_ERROR);
@@ -339,7 +328,7 @@ void migrate_fd_error(MigrationState *s)
 static void migrate_fd_cancel(MigrationState *s)
 {
     int old_state ;
-    DPRINTF("cancelling migration\n");
+    trace_migrate_fd_cancel();
 
     do {
         old_state = s->state;
@@ -589,29 +578,23 @@ static void *migration_thread(void *opaque)
     int64_t start_time = initial_time;
     bool old_vm_running = false;
 
-    DPRINTF("beginning savevm\n");
     qemu_savevm_state_begin(s->file, &s->params);
 
     s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
     migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_ACTIVE);
 
-    DPRINTF("setup complete\n");
-
     while (s->state == MIG_STATE_ACTIVE) {
         int64_t current_time;
         uint64_t pending_size;
 
         if (!qemu_file_rate_limit(s->file)) {
-            DPRINTF("iterate\n");
             pending_size = qemu_savevm_state_pending(s->file, max_size);
-            DPRINTF("pending size %" PRIu64 " max %" PRIu64 "\n",
+            trace_migrate_pending(pending_size, max_size);
-                    pending_size, max_size);
             if (pending_size && pending_size >= max_size) {
                 qemu_savevm_state_iterate(s->file);
             } else {
                 int ret;
 
-                DPRINTF("done iterating\n");
                 qemu_mutex_lock_iothread();
                 start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
                 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
@@ -650,9 +633,8 @@ static void *migration_thread(void *opaque)
             s->mbps = time_spent ? (((double) transferred_bytes * 8.0) /
                     ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1;
 
-            DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
+            trace_migrate_transferred(transferred_bytes, time_spent,
-                    " bandwidth %g max_size %" PRId64 "\n",
+                                      bandwidth, max_size);
-                    transferred_bytes, time_spent, bandwidth, max_size);
             /* if we haven't sent anything, we don't want to recalculate
                10000 is a small enough number for our purposes */
             if (s->dirty_bytes_rate && transferred_bytes > 10000) {

qemu-file.c

@@ -4,6 +4,7 @@
 #include "block/coroutine.h"
 #include "migration/migration.h"
 #include "migration/qemu-file.h"
+#include "trace.h"
 
 #define IO_BUF_SIZE 32768
 #define MAX_IOV_SIZE MIN(IOV_MAX, 64)
@@ -595,6 +596,7 @@ int qemu_fclose(QEMUFile *f)
         ret = f->last_error;
     }
     g_free(f);
+    trace_qemu_file_fclose();
     return ret;
 }
 

savevm.c

@@ -81,6 +81,7 @@ static void qemu_announce_self_iter(NICState *nic, void *opaque)
     uint8_t buf[60];
     int len;
 
+    trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr));
     len = announce_self_create(buf, nic->conf->macaddr.a);
 
     qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
@@ -429,6 +430,7 @@ void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
 
 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
 {
+    trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
     if (!se->vmsd) {         /* Old style */
         return se->ops->load_state(f, se->opaque, version_id);
     }
@@ -437,6 +439,7 @@ static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
 
 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
 {
+    trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
     if (!se->vmsd) {         /* Old style */
         se->ops->save_state(f, se->opaque);
         return;
@@ -463,6 +466,7 @@ void qemu_savevm_state_begin(QEMUFile *f,
     SaveStateEntry *se;
     int ret;
 
+    trace_savevm_state_begin();
     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
         if (!se->ops || !se->ops->set_params) {
             continue;
@@ -515,6 +519,7 @@ int qemu_savevm_state_iterate(QEMUFile *f)
     SaveStateEntry *se;
     int ret = 1;
 
+    trace_savevm_state_iterate();
     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
         if (!se->ops || !se->ops->save_live_iterate) {
             continue;
@@ -554,6 +559,8 @@ void qemu_savevm_state_complete(QEMUFile *f)
     SaveStateEntry *se;
     int ret;
 
+    trace_savevm_state_complete();
+
     cpu_synchronize_all_states();
 
     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
@@ -628,6 +635,7 @@ void qemu_savevm_state_cancel(void)
 {
     SaveStateEntry *se;
 
+    trace_savevm_state_cancel();
     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
         if (se->ops && se->ops->cancel) {
             se->ops->cancel(se->opaque);

trace-events

@@ -1042,6 +1042,17 @@ vmware_setmode(uint32_t w, uint32_t h, uint32_t bpp) "%dx%d @ %d bpp"
 # savevm.c
 savevm_section_start(const char *id, unsigned int section_id) "%s, section_id %u"
 savevm_section_end(const char *id, unsigned int section_id) "%s, section_id %u"
+savevm_state_begin(void) ""
+savevm_state_iterate(void) ""
+savevm_state_complete(void) ""
+savevm_state_cancel(void) ""
+vmstate_save(const char *idstr, const char *vmsd_name) "%s, %s"
+vmstate_load(const char *idstr, const char *vmsd_name) "%s, %s"
+vmstate_load_field_error(const char *field, int ret) "field \"%s\" load failed, ret = %d"
+qemu_announce_self_iter(const char *mac) "%s"
+
+# qemu-file.c
+qemu_file_fclose(void) ""
 
 # arch_init.c
 migration_bitmap_sync_start(void) ""
@@ -1181,6 +1192,11 @@ flic_reset_failed(int err) "flic: reset failed %d"
 
 # migration.c
 migrate_set_state(int new_state) "new state %d"
+migrate_fd_cleanup(void) ""
+migrate_fd_error(void) ""
+migrate_fd_cancel(void) ""
+migrate_pending(uint64_t size, uint64_t max) "pending size %" PRIu64 " max %" PRIu64
+migrate_transferred(uint64_t tranferred, uint64_t time_spent, double bandwidth, uint64_t size) "transferred %" PRIu64 " time_spent %" PRIu64 " bandwidth %g max_size %" PRId64
 
 # kvm-all.c
 kvm_ioctl(int type, void *arg) "type 0x%x, arg %p"

vmstate.c

@@ -3,6 +3,7 @@
 #include "migration/qemu-file.h"
 #include "migration/vmstate.h"
 #include "qemu/bitops.h"
+#include "trace.h"
 
 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
                                     void *opaque);
@@ -73,6 +74,7 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
 
                 }
                 if (ret < 0) {
+                    trace_vmstate_load_field_error(field->name, ret);
                     return ret;
                 }
             }