pipeline: reduce tick message in-use objects (#2226)

pingcap · Jul 7, 2021 · 661e175 · 661e175
1 parent 3c0be0d
commit 661e175
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/pkg/pipeline/message.go b/pkg/pipeline/message.go
@@ -64,11 +64,16 @@ func BarrierMessage(barrierTs model.Ts) *Message {
 	}
 }
 
+// TickMessage is called frequently,
+// to ease GC pressure we return a global variable.
+var tickMsg *Message = &Message{
+	Tp: MessageTypeTick,
+}
+
 // TickMessage creates the message of Tick
+// Note: the returned message is READ-ONLY.
 func TickMessage() *Message {
-	return &Message{
-		Tp: MessageTypeTick,
-	}
+	return tickMsg
 }
 
 // CommandType is the type of Command