diff --git a/src/cmd/trace/trace.go b/src/cmd/trace/trace.go
index 2b6a37bfd8..7d38ab0799 100644
--- a/src/cmd/trace/trace.go
+++ b/src/cmd/trace/trace.go
@@ -429,6 +429,9 @@ func generateTrace(params *traceParams) ViewerData {
 	ctx.emit(&ViewerEvent{Name: "process_name", Phase: "M", Pid: 1, Arg: &NameArg{"STATS"}})
 	ctx.emit(&ViewerEvent{Name: "process_sort_index", Phase: "M", Pid: 1, Arg: &SortIndexArg{0}})
 
+	ctx.emit(&ViewerEvent{Name: "thread_name", Phase: "M", Pid: 0, Tid: trace.GCP, Arg: &NameArg{"GC"}})
+	ctx.emit(&ViewerEvent{Name: "thread_sort_index", Phase: "M", Pid: 0, Tid: trace.GCP, Arg: &SortIndexArg{-6}})
+
 	ctx.emit(&ViewerEvent{Name: "thread_name", Phase: "M", Pid: 0, Tid: trace.NetpollP, Arg: &NameArg{"Network"}})
 	ctx.emit(&ViewerEvent{Name: "thread_sort_index", Phase: "M", Pid: 0, Tid: trace.NetpollP, Arg: &SortIndexArg{-5}})
 
diff --git a/src/internal/trace/parser.go b/src/internal/trace/parser.go
index b1fc17ac58..527aba7ab4 100644
--- a/src/internal/trace/parser.go
+++ b/src/internal/trace/parser.go
@@ -56,6 +56,7 @@ const (
 	TimerP   // depicts timer unblocks
 	NetpollP // depicts network unblocks
 	SyscallP // depicts returns from syscalls
+	GCP      // depicts GC state
 )
 
 // Parse parses, post-processes and verifies the trace.
@@ -548,6 +549,8 @@ func postProcessTrace(ver int, events []*Event) error {
 				return fmt.Errorf("previous GC is not ended before a new one (offset %v, time %v)", ev.Off, ev.Ts)
 			}
 			evGC = ev
+			// Attribute this to the global GC state.
+			ev.P = GCP
 		case EvGCDone:
 			if evGC == nil {
 				return fmt.Errorf("bogus GC end (offset %v, time %v)", ev.Off, ev.Ts)