runtime.ReadMemStats(&after)

	// Check to make sure that the big allocation (now freed)
	// had its memory shift into HeapReleased as a result of that
	// FreeOSMemory.
	if after.HeapReleased <= before.HeapReleased {
		t.Fatalf("no memory released: %d -> %d", before.HeapReleased, after.HeapReleased)
	}

	// Check to make sure bigBytes was released, plus some slack. Pages may get

			throw("heapInUse and consistent stats are not equal")
		}
		if gcController.heapReleased.load() != uint64(consStats.released) {
			print("runtime: heapReleased=", gcController.heapReleased.load(), "\n")
			print("runtime: consistent value=", consStats.released, "\n")
			throw("heapReleased and consistent stats are not equal")
		}
		heapRetained := gcController.heapInUse.load() + gcController.heapFree.load()

    </tr>

    <tr>
        <td>HeapIdle</td>
        <td id="HeapIdle">{{.HeapIdle}} bytes</td>
        <td>Bytes in idle (unused) spans.</td>
    </tr>

    <tr>
        <td>HeapReleased</td>
        <td id="HeapReleased">{{.HeapReleased}} bytes</td>
        <td>Physical memory returned to the OS.</td>
    </tr>

    <tr>
        <td>HeapObjects</td>
        <td id="HeapObjects">{{.HeapObjects}} objects</td>

	// heapBacked is an estimate of the amount of physical memory used by
	// this test. HeapSys is an estimate of the size of the mapped virtual
	// address space (which may or may not be backed by physical pages)
	// whereas HeapReleased is an estimate of the amount of bytes returned
	// to the OS. Their difference then roughly corresponds to the amount
	// of virtual address space that is backed by physical pages.
	//

		}
	}
	eq := func(x any) func(any) error {
		return func(y any) error {
			if x == y {
				return nil
			}
			return fmt.Errorf("want %v", x)
		}
	}
	// Of the uint fields, HeapReleased, HeapIdle can be 0.
	// PauseTotalNs can be 0 if timer resolution is poor.
	fields := map[string][]func(any) error{
		"Alloc": {nz, le(1e10)}, "TotalAlloc": {nz, le(1e11)}, "Sys": {nz, le(1e10)},

// managed by the Go runtime).
//
// More specifically, the following expression accurately reflects
// the value the runtime attempts to maintain as the limit:
//
//	runtime.MemStats.Sys - runtime.MemStats.HeapReleased
//
// or in terms of the runtime/metrics package:
//
//	/memory/classes/total:bytes - /memory/classes/heap/released:bytes
//
// A zero limit or a limit that's lower than the amount of memory

	sysFault(unsafe.Pointer(s.base()), s.npages*pageSize)

	// Everything on the list is counted as in-use, however sysFault transitions to
	// Reserved, not Prepared, so we skip updating heapFree or heapReleased and just
	// remove the memory from the total altogether; it's just address space now.
	gcController.heapInUse.add(-int64(s.npages * pageSize))

	// Count this as a free of an object right now as opposed to when

	fmt.Fprintf(w, "# HeapSys = %d\n", s.HeapSys)
	fmt.Fprintf(w, "# HeapIdle = %d\n", s.HeapIdle)
	fmt.Fprintf(w, "# HeapInuse = %d\n", s.HeapInuse)
	fmt.Fprintf(w, "# HeapReleased = %d\n", s.HeapReleased)
	fmt.Fprintf(w, "# HeapObjects = %d\n", s.HeapObjects)

	fmt.Fprintf(w, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
	fmt.Fprintf(w, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)

	//
	// The allocation is always aligned to the heap arena
	// size which is always > physPageSize, so its safe to
	// just add directly to heapReleased.
	sysMap(unsafe.Pointer(v), nBase-v, &gcController.heapReleased)

	// The memory just allocated counts as both released
	// and idle, even though it's not yet backed by spans.
	stats := memstats.heapStats.acquire()

			chunk := mheap_.pages.tryChunkOf(i)
			if chunk == nil {
				continue
			}
			pg := chunk.scavenged.popcntRange(0, pallocChunkPages)
			slow.HeapReleased += uint64(pg) * pageSize
		}
		for _, p := range allp {
			pg := sys.OnesCount64(p.pcache.scav)
			slow.HeapReleased += uint64(pg) * pageSize
		}

		getg().m.mallocing--
	})

	startTheWorld(stw)
	return
}