}
	if heap[i].timer != tw.timer {
		heap[i] = tw
	}
}

// siftDown puts the timer at position i in the right place
// in the heap by moving it down toward the bottom of the heap.
func (ts *timers) siftDown(i int) {
	heap := ts.heap
	n := len(heap)
	if i >= n {
		badTimer()
	}
	if i*timerHeapN+1 >= n {
		return
	}
	tw := heap[i]
	when := tw.when
	if when <= 0 {

//
// A note on latency: for sufficiently small heaps (<10s of GiB) this function will take constant
// time, but may take time proportional to the size of the mapped heap beyond that.
//
// The heap lock must not be held over this operation, since it will briefly acquire
// the heap lock.
//
// Must be called on the system stack because it acquires the heap lock.
//
//go:systemstack

			throw("failed to allocate debug log")
		}
		l.w.r.data = &l.w.data
		l.owned.Store(1)

		// Prepend to allDloggers list.
		headp := (*uintptr)(unsafe.Pointer(&allDloggers))
		for {
			head := atomic.Loaduintptr(headp)
			l.allLink = (*dlogger)(unsafe.Pointer(head))
			if atomic.Casuintptr(headp, head, uintptr(unsafe.Pointer(l))) {
				break
			}
		}
	}

	// If the time delta is getting too high, write a new sync

	// Mallocs is the cumulative count of heap objects allocated.
	// The number of live objects is Mallocs - Frees.
	Mallocs uint64

	// Frees is the cumulative count of heap objects freed.
	Frees uint64

	// Heap memory statistics.
	//
	// Interpreting the heap statistics requires some knowledge of
	// how Go organizes memory. Go divides the virtual address
	// space of the heap into "spans", which are contiguous

      Heap heap;
      if (crossOver == index) {
        heap = this;
      } else {
        index = crossOver;
        heap = otherHeap;
      }
      heap.bubbleUpAlternatingLevels(index, x);
    }

    /**
     * Bubbles a value from {@code index} up the levels of this heap, and returns the index the
     * element ended up at.
     */
    @CanIgnoreReturnValue

		Cumulative count of heap allocations whose storage was freed
		by the garbage collector. Note that this does not include tiny
		objects as defined by /gc/heap/tiny/allocs:objects, only tiny
		blocks.

	/gc/heap/goal:bytes
		Heap size target for the end of the GC cycle.

	/gc/heap/live:bytes
		Heap memory occupied by live objects that were marked by the
		previous GC.

	/gc/heap/objects:objects

      Heap heap;
      if (crossOver == index) {
        heap = this;
      } else {
        index = crossOver;
        heap = otherHeap;
      }
      heap.bubbleUpAlternatingLevels(index, x);
    }

    /**
     * Bubbles a value from {@code index} up the levels of this heap, and returns the index the
     * element ended up at.
     */
    @CanIgnoreReturnValue

	// structure is meant to represent the Go heap. At worst, copying this
	// would take ~160µs assuming a conservative copying rate of 25 GiB/s (the
	// copy will almost never trigger a page fault) for a 1 TiB heap with 4 MiB
	// arenas which is completely discontiguous. ~160µs is still a lot, but in
	// practice most platforms have 64 MiB arenas (which cuts this by a factor
	// of 16) and Go heaps are usually mostly contiguous, so the chance that

	// over the lifetime of the program.
	totalAllocated uint64

	// totalFreed is the total bytes of heap objects freed
	// over the lifetime of the program.
	totalFreed uint64

	// totalAllocs is the number of heap objects allocated over
	// the lifetime of the program.
	totalAllocs uint64

	// totalFrees is the number of heap objects freed over
	// the lifetime of the program.

//
// 1. shade(*slot) prevents a mutator from hiding an object by moving
// the sole pointer to it from the heap to its stack. If it attempts
// to unlink an object from the heap, this will shade it.
//
// 2. shade(ptr) prevents a mutator from hiding an object by moving
// the sole pointer to it from its stack into a black object in the
// heap. If it attempts to install the pointer into a black object,
// this will shade it.
//