s := c.alloc[i]
		if s != &emptymspan {
			slotsUsed := int64(s.allocCount) - int64(s.allocCountBeforeCache)
			s.allocCountBeforeCache = 0

			// Adjust smallAllocCount for whatever was allocated.
			stats := memstats.heapStats.acquire()
			atomic.Xadd64(&stats.smallAllocCount[spanClass(i).sizeclass()], slotsUsed)
			memstats.heapStats.release()

			// Adjust the actual allocs in inconsistent, internal stats.

	unsafe.Offsetof(p{}.gcFractionalMarkTime),
	unsafe.Offsetof(profBuf{}.overflow),
	unsafe.Offsetof(profBuf{}.overflowTime),
	unsafe.Offsetof(heapStatsDelta{}.tinyAllocCount),
	unsafe.Offsetof(heapStatsDelta{}.smallAllocCount),
	unsafe.Offsetof(heapStatsDelta{}.smallFreeCount),
	unsafe.Offsetof(heapStatsDelta{}.largeAlloc),
	unsafe.Offsetof(heapStatsDelta{}.largeAllocCount),
	unsafe.Offsetof(heapStatsDelta{}.largeFree),

	a.inPtrScalarBits += b.inPtrScalarBits

	a.tinyAllocCount += b.tinyAllocCount
	a.largeAlloc += b.largeAlloc
	a.largeAllocCount += b.largeAllocCount
	for i := range b.smallAllocCount {
		a.smallAllocCount[i] += b.smallAllocCount[i]
	}
	a.largeFree += b.largeFree
	a.largeFreeCount += b.largeFreeCount
	for i := range b.smallFreeCount {
		a.smallFreeCount[i] += b.smallFreeCount[i]
	}
}

	// Calculate derived stats.
	a.totalAllocs = a.largeAllocCount
	a.totalFrees = a.largeFreeCount
	a.totalAllocated = a.largeAlloc
	a.totalFreed = a.largeFree
	for i := range a.smallAllocCount {
		na := a.smallAllocCount[i]
		nf := a.smallFreeCount[i]
		a.totalAllocs += na
		a.totalFrees += nf
		a.totalAllocated += na * uint64(class_to_size[i])
		a.totalFreed += nf * uint64(class_to_size[i])
	}