EvGCSweepEnd         // GC sweep done [timestamp, swept bytes, reclaimed bytes]
	EvGCMarkAssistActive // GC mark assist active [timestamp, goroutine ID]
	EvGCMarkAssistBegin  // GC mark assist start [timestamp, stack ID]
	EvGCMarkAssistEnd    // GC mark assist done [timestamp]
	EvHeapAlloc          // gcController.heapLive change [timestamp, heap alloc in bytes]

			hasSyncBlockTime = true
		}
		if dt, ok := summary.RangeTime["GC mark assist"]; ok && dt > 0 {
			hasGCMarkAssistTime = true
		}
	}
	if !hasSchedWaitTime {
		t.Error("missing sched wait time")
	}
	if !hasSyncBlockTime {
		t.Error("missing sync block time")
	}
	if !hasGCMarkAssistTime {
		t.Error("missing GC mark assist time")
	}
}

func TestSummarizeGoroutinesRegionsTrace(t *testing.T) {

	// Per-G GC state

	// gcAssistBytes is this G's GC assist credit in terms of
	// bytes allocated. If this is positive, then the G has credit
	// to allocate gcAssistBytes bytes without assisting. If this
	// is negative, then the G must correct this by performing
	// scan work. We track this in bytes to make it fast to update
	// and check for debt in the malloc hot path. The assist ratio
	// determines how this corresponds to scan work debt.

					// If the goroutine isn't executing, then the fact that it was in mark
					// assist doesn't actually count.
					break
				}
				// This G has been in a mark assist *and running on its P* since the start
				// of the trace.
				fallthrough
			case handleSweep(r):
				// This P has been in sweep (or mark assist, from above) in the start of the trace.
				//

	if runtime.GOOS == "linux" {
		if cpu.gcDedicated <= 0 && cpu.gcAssist <= 0 && cpu.gcIdle <= 0 {
			t.Errorf("found no time spent on GC work: %#v", cpu)
		}
		if cpu.gcPause <= 0 {
			t.Errorf("found no GC pauses: %f", cpu.gcPause)
		}
		if cpu.idle <= 0 {
			t.Errorf("found no idle time: %f", cpu.idle)
		}
		if total := cpu.gcDedicated + cpu.gcAssist + cpu.gcIdle + cpu.gcPause; !withinEpsilon(cpu.gcTotal, total, 0.001) {

		case ResourceGoroutine:
			// Simple goroutine range. We attribute the entire range regardless of
			// goroutine stats. Lots of situations are still identifiable, e.g. a
			// goroutine blocked often in mark assist will have both high mark assist
			// and high block times. Those interested in a deeper view can look at the
			// trace viewer.
			g = s.gs[r.Scope.Goroutine()]
		case ResourceProc:

	EvGoBlockGC         event.Type = 42 // goroutine blocks on GC assist [timestamp, stack]
	EvGCMarkAssistStart event.Type = 43 // GC mark assist start [timestamp, stack]
	EvGCMarkAssistDone  event.Type = 44 // GC mark assist done [timestamp]
	EvUserTaskCreate    event.Type = 45 // trace.NewTask [timestamp, internal task id, internal parent id, stack, name string]

	addBuiltin(sNetwork, "network")
	addBuiltin(sSync, "sync")
	addBuiltin(sSyncCond, "sync.(*Cond).Wait")
	addBuiltin(sSelect, "select")
	addBuiltin(sEmpty, "")
	addBuiltin(sMarkAssistWait, "GC mark assist wait for work")
	addBuiltin(sSTWUnknown, "")
	addBuiltin(sSTWGCMarkTermination, "GC mark termination")
	addBuiltin(sSTWGCSweepTermination, "GC sweep termination")
	addBuiltin(sSTWWriteHeapDump, "write heap dump")

	/cgo/go-to-c-calls:calls
		Count of calls made from Go to C by the current process.

	/cpu/classes/gc/mark/assist:cpu-seconds
		Estimated total CPU time goroutines spent performing GC
		tasks to assist the GC and prevent it from falling behind the
		application. This metric is an overestimate, and not directly
		comparable to system CPU time measurements. Compare only with
		other /cpu/classes metrics.

		# P          number of processors used, or /sched/gomaxprocs:threads
	The phases are stop-the-world (STW) sweep termination, concurrent
	mark and scan, and STW mark termination. The CPU times
	for mark/scan are broken down in to assist time (GC performed in
	line with allocation), background GC time, and idle GC time.
	If the line ends with "(forced)", this GC was forced by a
	runtime.GC() call.