// 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.
				//

// license that can be found in the LICENSE file.

//go:build gc

package goroot

import (
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"sync"
)

// IsStandardPackage reports whether path is a standard package,
// given goroot and compiler.
func IsStandardPackage(goroot, compiler, path string) bool {
	switch compiler {
	case "gc":
		dir := filepath.Join(goroot, "src", path)

	ppath := p.ImportPath
	if cfg.BuildBuildmode == "plugin" {
		ppath = pluginPath(a)
	} else if p.Name == "main" && !p.Internal.ForceLibrary {
		ppath = "main"
	}
	return ppath
}

func (gcToolchain) gc(b *Builder, a *Action, archive string, importcfg, embedcfg []byte, symabis string, asmhdr bool, pgoProfile string, gofiles []string) (ofile string, output []byte, err error) {
	p := a.Package
	sh := b.Shell(a)
	objdir := a.Objdir

// 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,

func (gc *GarbageCollector) processAttemptToDeleteWorker(ctx context.Context) bool {
	item, quit := gc.attemptToDelete.Get()
	gc.workerLock.RLock()
	defer gc.workerLock.RUnlock()
	if quit {
		return false
	}
	defer gc.attemptToDelete.Done(item)

	action := gc.attemptToDeleteWorker(ctx, item)
	switch action {
	case forgetItem:
		gc.attemptToDelete.Forget(item)
	case requeueItem:

	},
	{
		Name:        "/gc/scan/stack:bytes",
		Description: "The number of bytes of stack that were scanned last GC cycle.",
		Kind:        KindUint64,
	},
	{
		Name:        "/gc/scan/total:bytes",
		Description: "The total amount space that is scannable. Sum of all metrics in /gc/scan.",
		Kind:        KindUint64,
	},
	{
		Name:        "/gc/stack/starting-size:bytes",