"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"
	"unsafe"
)

func TestGcSys(t *testing.T) {
	t.Skip("skipping known-flaky test; golang.org/issue/37331")
	if os.Getenv("GOGC") == "off" {
		t.Skip("skipping test; GOGC=off in environment")
	}
	got := runTestProg(t, "testprog", "GCSys")
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestLabelSystemstack(t *testing.T) {
	// Grab and re-set the initial value before continuing to ensure
	// GOGC doesn't actually change following the test.
	gogc := debug.SetGCPercent(100)
	debug.SetGCPercent(gogc)

	matches := matchAndAvoidStacks(stackContainsLabeled, []string{"runtime.systemstack;key=value"}, avoidFunctions())

and use may change from release to release.

The GOGC variable sets the initial garbage collection target percentage.
A collection is triggered when the ratio of freshly allocated data to live data
remaining after the previous collection reaches this percentage. The default
is GOGC=100. Setting GOGC=off disables the garbage collector entirely.

// the amount already in use. The proportion is controlled by GOGC environment variable
// (100 by default). If GOGC=100 and we're using 4M, we'll GC again when we get to 8M
// (this mark is computed by the gcController.heapGoal method). This keeps the GC cost in
// linear proportion to the allocation cost. Adjusting GOGC just changes the linear constant
// (and also the amount of extra memory used).

// Oblets

	logger := klog.FromContext(ctx)
	stopCh := ctx.Done()

	// To help debugging, immediately log version
	logger.Info("Starting", "version", version.Get())

	logger.Info("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))

	// Start events processing pipeline.
	c.EventBroadcaster.StartStructuredLogging(0)

	//
	// The garbage collector's goal is to keep HeapAlloc ≤ NextGC.
	// At the end of each GC cycle, the target for the next cycle
	// is computed based on the amount of reachable data and the
	// value of GOGC.
	NextGC uint64

	// LastGC is the time the last garbage collection finished, as
	// nanoseconds since 1970 (the UNIX epoch).
	LastGC uint64

	// PauseTotalNs is the cumulative nanoseconds in GC

		Kind:        KindUint64,
		Cumulative:  true,
	},
	{
		Name: "/gc/gogc:percent",
		Description: "Heap size target percentage configured by the user, otherwise 100. This " +
			"value is set by the GOGC environment variable, and the runtime/debug.SetGCPercent " +
			"function.",
		Kind: KindUint64,
	},
	{
		Name: "/gc/gomemlimit:bytes",
		Description: "Go runtime memory limit configured by the user, otherwise " +

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

	/gc/gogc:percent
		Heap size target percentage configured by the user, otherwise
		100. This value is set by the GOGC environment variable, and the
		runtime/debug.SetGCPercent function.

	/gc/gomemlimit:bytes
		Go runtime memory limit configured by the user, otherwise
		math.MaxInt64. This value is set by the GOMEMLIMIT environment

	// To help debugging, immediately log version
	klog.InfoS("Kubelet version", "kubeletVersion", version.Get())

	klog.InfoS("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))

	if err := initForOS(s.KubeletFlags.WindowsService, s.KubeletFlags.WindowsPriorityClass); err != nil {

	logger := klog.FromContext(ctx)
	// To help debugging, immediately log version
	logger.Info("Version info", "version", version.Get())

	logger.Info("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))

	proxymetrics.RegisterMetrics(s.Config.Mode)

	// TODO(vmarmol): Use container config for this.