const minRunway = 64 << 10
		if c.triggered != ^uint64(0) && goal < c.triggered+minRunway {
			goal = c.triggered + minRunway
		}
	}
	return
}

// memoryLimitHeapGoal returns a heap goal derived from memoryLimit.
func (c *gcControllerState) memoryLimitHeapGoal() uint64 {
	// Start by pulling out some values we'll need. Be careful about overflow.
	var heapFree, heapAlloc, mappedReady uint64
	for {