[PATCH 2/7] migration: Add two more trace points for incoming channel mgmt

[Peter Xu <peterx@redhat.com>]

We have trace points for both multifd channel and preempt channel when a
new channel is established on the destination, but no main channel.  We can
normally deduce this by analyzing the socket channel tracepoints, but add
one for debugging purpose so in a trace log we can see when all channels
are established.

Add one more for start / resume of incoming migration too.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/migration.c  | 3 +++
 migration/trace-events | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/migration/migration.c b/migration/migration.c
index d14beb5d22..cfadcc79c2 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -852,6 +852,7 @@ bool migration_incoming_setup(QIOChannel *ioc, uint8_t channel, Error **errp)
         assert(!mis->from_src_file);
         mis->from_src_file = f;
         qemu_file_set_blocking(f, false, &error_abort);
+        trace_migration_main_channel_received();
         break;
 
     case CH_MULTIFD:
@@ -918,6 +919,8 @@ static bool postcopy_try_recover(void)
 
 void migration_start_incoming(void)
 {
+    trace_migration_start_incoming();
+
     if (postcopy_try_recover()) {
         return;
     }
diff --git a/migration/trace-events b/migration/trace-events
index e87d4abd91..e755872496 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -200,6 +200,8 @@ postcopy_preempt_enabled(bool value) "%d"
 migration_precopy_complete(void) ""
 migration_call_notifiers(int type) "type=%d"
 migration_request_switchover_ack_legacy(const char *requester, unsigned int switchover_ack_pending_num_legacy) "Requester %s, switchover_ack_pending_num_legacy %u"
+migration_main_channel_received(void) ""
+migration_start_incoming(void) ""
 
 # migration-stats
 migration_transferred_bytes(uint64_t qemu_file, uint64_t multifd, uint64_t rdma) "qemu_file %" PRIu64 " multifd %" PRIu64 " RDMA %" PRIu64
-- 
2.55.0