[PATCH 7/7] migration: Finer grained tracepoints for POSTCOPY_LISTEN

[Peter Xu]

The enablement of postcopy listening has a few steps, add a few tracepoints to
be there ready for some basic measurements for them.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/savevm.c     | 5 ++++-
 migration/trace-events | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 17b8e25e00..5b3f31eab2 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1946,7 +1946,7 @@ static void *postcopy_ram_listen_thread(void *opaque)
 static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
 {
     PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING);
-    trace_loadvm_postcopy_handle_listen();
+    trace_loadvm_postcopy_handle_listen(1);
     Error *local_err = NULL;
 
     if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) {
@@ -1962,6 +1962,7 @@ static int 
loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
             postcopy_ram_prepare_discard(mis);
         }
     }
+    trace_loadvm_postcopy_handle_listen(2);
 
     /*
      * Sensitise RAM - can now generate requests for blocks that don't exist
@@ -1974,6 +1975,7 @@ static int 
loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
             return -1;
         }
     }
+    trace_loadvm_postcopy_handle_listen(3);
 
     if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, &local_err)) {
         error_report_err(local_err);
@@ -1988,6 +1990,7 @@ static int 
loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
                        QEMU_THREAD_DETACHED);
     qemu_sem_wait(&mis->listen_thread_sem);
     qemu_sem_destroy(&mis->listen_thread_sem);
+    trace_loadvm_postcopy_handle_listen(4);
 
     return 0;
 }
diff --git a/migration/trace-events b/migration/trace-events
index d63a5915f5..1aa6937dc1 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -14,7 +14,7 @@ loadvm_handle_cmd_packaged_main(int ret) "%d"
 loadvm_handle_cmd_packaged_received(int ret) "%d"
 loadvm_handle_recv_bitmap(char *s) "%s"
 loadvm_postcopy_handle_advise(void) ""
-loadvm_postcopy_handle_listen(void) ""
+loadvm_postcopy_handle_listen(int i) "%d"
 loadvm_postcopy_handle_run(void) ""
 loadvm_postcopy_handle_run_cpu_sync(void) ""
 loadvm_postcopy_handle_run_vmstart(void) ""
-- 
2.32.0