// Started running while doing GC things.
					ps[ev.Proc()].gc++
				} else if old.Executing() && !new.Executing() {
					// Stopped running while doing GC things.
					ps[ev.Proc()].gc--
				}
			}
			states[g] = new
		case EventLabel:
			l := ev.Label()
			if flags&UtilBackground != 0 && strings.HasPrefix(l.Label, "GC ") && l.Label != "GC (idle)" {
				// Background mark worker.
				//

// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Tests a GC-heavy program. This is useful for shaking out
// all sorts of corner cases about GC-related ranges.

//go:build ignore

package main

import (
	"log"
	"os"
	"runtime"
	"runtime/trace"
	"time"
)

type node struct {
	children [4]*node

	pc=4804475 func=32 file=33 line=60
EventBatch gen=3 m=18446744073709551615 time=28114950894688 size=2762
Strings
String id=1
	data="Not worker"
String id=2
	data="GC (dedicated)"
String id=3
	data="GC (fractional)"
String id=4
	data="GC (idle)"
String id=5
	data="unspecified"
String id=6
	data="forever"
String id=7
	data="network"
String id=8
	data="select"
String id=9

		to system CPU time measurements. Compare only with other
		/cpu/classes metrics.

	/gc/cycles/automatic:gc-cycles
		Count of completed GC cycles generated by the Go runtime.

	/gc/cycles/forced:gc-cycles
		Count of completed GC cycles forced by the application.

	/gc/cycles/total:gc-cycles
		Count of all completed GC cycles.

	/gc/gogc:percent
		Heap size target percentage configured by the user, otherwise

		case "/gc/heap/frees:objects":
			objects.frees = samples[i].Value.Uint64()
		case "/gc/heap/frees-by-size:bytes":
			objects.free = samples[i].Value.Float64Histogram()
		case "/gc/cycles:gc-cycles":
			gc.numGC = samples[i].Value.Uint64()
		case "/gc/pauses:seconds":
			h := samples[i].Value.Float64Histogram()
			gc.pauses = 0
			for i := range h.Counts {
				gc.pauses += h.Counts[i]
			}
		case "/gc/scan/heap:bytes":

	}
}

// gcMode indicates how concurrent a GC cycle should be.
type gcMode int

const (
	gcBackgroundMode gcMode = iota // concurrent GC and sweep
	gcForceMode                    // stop-the-world GC now, concurrent sweep
	gcForceBlockMode               // stop-the-world GC now and STW sweep (forced by user)
)

// A gcTrigger is a predicate for starting a GC cycle. Specifically,

	// This package only handles gc export data.
	if runtime.Compiler != "gc" {
		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
	}

	compileAndImportPkg(t, "issue15920")
}

func TestIssue20046(t *testing.T) {
	testenv.MustHaveGoBuild(t)

	// This package only handles gc export data.
	if runtime.Compiler != "gc" {

	// Test that runtime.GC() triggers a GC even if GOGC=off.
	defer debug.SetGCPercent(debug.SetGCPercent(-1))

	var ms1, ms2 runtime.MemStats
	runtime.ReadMemStats(&ms1)
	runtime.GC()
	runtime.ReadMemStats(&ms2)
	if ms1.NumGC == ms2.NumGC {
		t.Fatalf("runtime.GC() did not trigger GC")
	}
	if ms1.NumForcedGC == ms2.NumForcedGC {
		t.Fatalf("runtime.GC() was not accounted in NumForcedGC")
	}
}

	EvGCStart           = 7  // GC start [timestamp, seq, stack id]
	EvGCDone            = 8  // GC done [timestamp]
	EvSTWStart          = 9  // GC mark termination start [timestamp, kind]
	EvSTWDone           = 10 // GC mark termination done [timestamp]
	EvGCSweepStart      = 11 // GC sweep start [timestamp, stack id]
	EvGCSweepDone       = 12 // GC sweep done [timestamp, swept, reclaimed]

	waitReasonGCWorkerIdle                            // "GC worker (idle)"
	waitReasonGCWorkerActive                          // "GC worker (active)"
	waitReasonPreempted                               // "preempted"
	waitReasonDebugCall                               // "debug call"
	waitReasonGCMarkTermination                       // "GC mark termination"