</p>
        <p>
          <b>Include</b><br>
          <input type="checkbox" id="stw" checked><label for="stw">STW</label>
          <span class="help">?<span>Stop-the-world stops all goroutines simultaneously.</span></span><br>
          <input type="checkbox" id="background" checked><label for="background">Background workers</label>

	// is in the range [0, 1].
	Util float64
}

// UtilFlags controls the behavior of MutatorUtilization.
type UtilFlags int

const (
	// UtilSTW means utilization should account for STW events.
	// This includes non-GC STW events, which are typically user-requested.
	UtilSTW UtilFlags = 1 << iota
	// UtilBackground means utilization should account for
	// background mark workers.
	UtilBackground

	EvGoStatus            // goroutine status at the start of a generation [timestamp, goroutine ID, thread ID, status]

	// STW.
	EvSTWBegin // STW start [timestamp, kind]
	EvSTWEnd   // STW done [timestamp]

	// GC events.
	EvGCActive           // GC active [timestamp, seq]
	EvGCBegin            // GC start [timestamp, seq, stack ID]

}

// finishGCTransition notifies the limiter that the GC transition is complete
// and releases ownership of it. It also accumulates STW time in the bucket.
// now must be the timestamp from the end of the STW pause.
func (l *gcCPULimiterState) finishGCTransition(now int64) {
	if !l.transitioning {
		throw("finishGCTransition called without starting one?")
	}

	}

	// STW to guarantee that user goroutines see an atomic change to thread
	// state. Without STW, goroutines could migrate Ms while change is in
	// progress and e.g., see state old -> new -> old -> new.
	//
	// N.B. Internally, this function does not depend on STW to
	// successfully change every thread. It is only needed for user
	// expectations, per above.
	stw := stopTheWorld(stwAllThreadsSyscall)

	// store instructions always have the memory operand at the end, no need to reorder
	// indexed stores handled separately
	case STB, STBU,
		STH, STHU,
		STW, STWU,
		STD, STDU,
		STFD, STFDU,
		STFS, STFSU,
		STQ, HASHST, HASHSTP:
		return op + " " + strings.Join(args, ",")

	case FCMPU, FCMPO, CMPD, CMPDI, CMPLD, CMPLDI, CMPW, CMPWI, CMPLW, CMPLWI:

	mcache_sys   sysMemStat
	buckhash_sys sysMemStat // profiling bucket hash table

	// Statistics about GC overhead.
	gcMiscSys sysMemStat // updated atomically or during STW

	// Miscellaneous statistics.
	other_sys sysMemStat // updated atomically or during STW

	// Statistics about the garbage collector.

	// Protected by mheap or worldsema during GC.
	last_gc_unix    uint64 // last gc (in unix time)
	pause_total_ns  uint64

	// This is necessary to ensure the consistency of the STW events. If we're feeling
	// adventurous we could lift this restriction and add a STWActive event, but the
	// cost of maintaining this consistency is low. We're not going to hold this semaphore
	// for very long and most STW periods are very short.
	// Once we hold worldsema, prevent preemption as well so we're not interrupted partway

var ReadUnaligned64 = readUnaligned64

func CountPagesInUse() (pagesInUse, counted uintptr) {
	stw := stopTheWorld(stwForTestCountPagesInUse)

	pagesInUse = mheap_.pagesInUse.Load()

	for _, s := range mheap_.allspans {
		if s.state.get() == mSpanInUse {
			counted += s.npages
		}
	}

	startTheWorld(stw)

	return
}

func Fastrand() uint32          { return uint32(rand()) }

package runtime

import (
	"internal/abi"
	"internal/goarch"
	"unsafe"
)

//go:linkname runtime_debug_WriteHeapDump runtime/debug.WriteHeapDump
func runtime_debug_WriteHeapDump(fd uintptr) {
	stw := stopTheWorld(stwWriteHeapDump)

	// Keep m on this G's stack instead of the system stack.
	// Both readmemstats_m and writeheapdump_m have pretty large
	// peak stack depths and we risk blowing the system stack.