// reads to avoid frequent wakeups.
			trace.cpuSleep.sleep(100_000_000)

			tl := traceAcquire()
			if !tl.ok() {
				// Tracing disabled.
				break
			}
			keepGoing := traceReadCPU(tl.gen)
			traceRelease(tl)
			if !keepGoing {
				break
			}
		}
		done <- struct{}{}
	}()
	trace.cpuLogDone = done
}

// traceStopReadCPU blocks until the trace CPU reading goroutine exits.
//

		throw("mspan.sweep: bad span state")
	}

	trace := traceAcquire()
	if trace.ok() {
		trace.GCSweepSpan(s.npages * _PageSize)
		traceRelease(trace)
	}

	mheap_.pagesSwept.Add(int64(s.npages))

	spc := s.spanclass
	size := s.elemsize

	// The allocBits indicate which unmarked objects don't need to be

			}
			abits.advance()
		}
	}

	// Write out all the goroutine stacks.
	forEachGRace(func(gp *g) {
		trace.GoroutineStackExists(gp.stack.lo, gp.stack.hi-gp.stack.lo)
	})
	traceRelease(trace)
}

func traceSpanTypeAndClass(s *mspan) traceArg {
	if s.state.get() == mSpanInUse {
		return traceArg(s.spanclass) << 1
	}
	return traceArg(1)
}

	}

	// Donate locked state.
	if locked {
		mp.lockedg.set(gnext)
		gnext.lockedm.set(mp)
	}

	// Release the trace locker. We've completed all the necessary transitions..
	if trace.ok() {
		traceRelease(trace)
	}

	// Switch to gnext. Does not return.
	gogo(&gnext.sched)

	// sweeping, so we can read h.sweepArenas, and so
	// traceGCSweepStart/Done pair on the P.
	mp := acquirem()

	trace := traceAcquire()
	if trace.ok() {
		trace.GCSweepStart()
		traceRelease(trace)
	}

	arenas := h.sweepArenas
	locked := false
	for npage > 0 {
		// Pull from accumulated credit first.
		if credit := h.reclaimCredit.Load(); credit > 0 {
			take := credit

				// acquire/release because this is part of the
				// goroutine's trace state, and it must be atomic
				// with respect to the tracer.
				gp.inMarkAssist = false
				traceRelease(trace)
			} else {
				// This state is tracked even if tracing isn't enabled.
				// It's only used by the new tracer.
				// See the comment on enteredMarkAssistForTracing.
				gp.inMarkAssist = false
			}

}

func reflectOffsLock() {
	lock(&reflectOffs.lock)
	if raceenabled {
		raceacquire(unsafe.Pointer(&reflectOffs.lock))
	}
}

func reflectOffsUnlock() {
	if raceenabled {
		racerelease(unsafe.Pointer(&reflectOffs.lock))
	}
	unlock(&reflectOffs.lock)
}

// resolveNameOff should be an internal detail,
// but widely used packages access it using linkname.

	}

	// Run the background mark worker.
	gp := node.gp.ptr()
	trace := traceAcquire()
	casgstatus(gp, _Gwaiting, _Grunnable)
	if trace.ok() {
		trace.GoUnpark(gp, 0)
		traceRelease(trace)
	}
	return gp, now
}

// resetLive sets up the controller state for the next mark phase after the end
// of the previous one. Must be called after endCycle and before commit, before

	// until then.
	if raceenabled && mainStarted {
		raceacquire(unsafe.Pointer(&cbs.lock))
	}
}

func cbsUnlock() {
	if raceenabled && mainStarted {
		racerelease(unsafe.Pointer(&cbs.lock))
	}
	unlock(&cbs.lock)
}

// winCallback records information about a registered Go callback.
type winCallback struct {
	fn     *funcval // Go function

			s.elemsize = uintptr(n)
		}
		v = unsafe.Pointer(s.base())
	}

	if traceAllocFreeEnabled() {
		trace := traceTryAcquire()
		if trace.ok() {
			trace.GoroutineStackAlloc(uintptr(v), uintptr(n))
			traceRelease(trace)
		}
	}
	if raceenabled {
		racemalloc(v, uintptr(n))
	}
	if msanenabled {
		msanmalloc(v, uintptr(n))
	}
	if asanenabled {
		asanunpoison(v, uintptr(n))
	}