func (b *pallocBits) allocAll() {
	(*pageBits)(b).setAll()
}

// free1 frees a single page in the pallocBits at i.
func (b *pallocBits) free1(i uint) {
	(*pageBits)(b).clear(i)
}

// free frees the range [i, i+n) of pages in the pallocBits.
func (b *pallocBits) free(i, n uint) {
	(*pageBits)(b).clearRange(i, n)
}

// freeAll frees all the bits of b.
func (b *pallocBits) freeAll() {
	(*pageBits)(b).clearAll()

			p.chunkOf(sc).free(si, pallocChunkPages-si)
			p.scav.index.free(sc, si, pallocChunkPages-si)
			for c := sc + 1; c < ec; c++ {
				p.chunkOf(c).freeAll()
				p.scav.index.free(c, 0, pallocChunkPages)
			}
			p.chunkOf(ec).free(0, ei+1)
			p.scav.index.free(ec, 0, ei+1)
		}
	}
	p.update(base, npages, true, false)
}

const (
	pallocSumBytes = unsafe.Sizeof(pallocSum(0))

	Lookups uint64

	// 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

			// objects, because a fresh span that had been allocated into,
			// wasn't totally filled, but then swept, still has all of its
			// free slots zeroed.
			s.needzero = 1
			stats := memstats.heapStats.acquire()
			atomic.Xadd64(&stats.smallFreeCount[spc.sizeclass()], int64(nfreed))
			memstats.heapStats.release()

			// Count the frees in the inconsistent, internal stats.

// that were exhausted when allocating into the arena. Once the arena is freed,
// it frees all full chunks it references, and places the active one onto a reuse
// list for a future arena to use. Each arena keeps its list of referenced chunks
// explicitly live until it is freed. Each user arena also maps to an object which
// has a finalizer attached that ensures the arena's chunks are all freed even if
// the arena itself is never explicitly freed.
//

		}
		slow.Frees += m.tinyAllocCount + m.largeFreeCount
		slow.Mallocs += slow.Frees

		slow.TotalAlloc = slow.Alloc + m.largeFree + smallFree

		for i := range slow.BySize {
			slow.BySize[i].Mallocs = bySize[i].Mallocs
			slow.BySize[i].Frees = bySize[i].Frees
		}

		for i := mheap_.pages.start; i < mheap_.pages.end; i++ {
			chunk := mheap_.pages.tryChunkOf(i)

		Kind:        KindUint64,
	},
	{
		Name: "/memory/classes/heap/released:bytes",
		Description: "Memory that is completely free and has been returned to the underlying system. This " +
			"metric is the runtime's estimate of free address space that is still mapped into the process, " +
			"but is not backed by physical memory.",

		freed, err := im.freeSpace(ctx, amountToFree, freeTime, images)
		if err != nil {
			return err
		}

		if freed < amountToFree {
			err := fmt.Errorf("Failed to garbage collect required amount of images. Attempted to free %d bytes, but only found %d bytes eligible to free.", amountToFree, freed)

		defined by /gc/heap/tiny/allocs:objects, only tiny blocks.

	/gc/heap/frees-by-size:bytes
		Distribution of freed heap allocations by approximate size.
		Bucket counts increase monotonically. Note that this does not
		include tiny objects as defined by /gc/heap/tiny/allocs:objects,
		only tiny blocks.

	/gc/heap/frees:bytes
		Cumulative sum of heap memory freed by the garbage collector.

	/gc/heap/frees:objects

	// list and move all workbuf spans to the free list.
	work.empty = 0
	work.wbufSpans.free.takeAll(&work.wbufSpans.busy)
	unlock(&work.wbufSpans.lock)
}

// freeSomeWbufs frees some workbufs back to the heap and returns
// true if it should be called again to free more.
func freeSomeWbufs(preemptible bool) bool {
	const batchSize = 64 // ~1–2 µs per span.
	lock(&work.wbufSpans.lock)