}

// pages64 returns a 64-bit bitmap representing a block of 64 pages aligned
// to 64 pages. The returned block of pages is the one containing the i'th
// page in this pallocBits. Each bit represents whether the page is in-use.
func (b *pallocBits) pages64(i uint) uint64 {
	return (*pageBits)(b).block64(i)
}

// allocPages64 allocates a 64-bit block of 64 pages aligned to 64 pages according

// directio.AlignSize is defined as 0 in MacOS causing divide by 0 error.
const DirectioAlignSize = 4096

// CopyAligned - copies from reader to writer using the aligned input
// buffer, it is expected that input buffer is page aligned to
// 4K page boundaries. Without passing aligned buffer may cause
// this function to return error.
//
// This code is similar in spirit to io.Copy but it is only to be

	m.mutex.Lock()
	defer m.mutex.Unlock()
	for resource, requested := range accumulatedResourceRequests {
		// Only consider devices that actually contain topology information.
		if aligned := m.deviceHasTopologyAlignment(resource); !aligned {
			klog.InfoS("Resource does not have a topology preference", "resource", resource)
			deviceHints[resource] = nil
			continue
		}

	// nothing else allocates from it.
	runtime.Acquirem()

	// Make 1-byte allocations until we get a fresh tiny slot.
	aligned := false
	for i := 0; i < 16; i++ {
		x := runtime.Escape(new(byte))
		if uintptr(unsafe.Pointer(x))&0xf == 0xf {
			aligned = true
			break
		}
	}
	if !aligned {
		runtime.Releasem()
		t.Fatal("unable to get a fresh tiny slot")
	}

	// Create a 4-byte object so that the current

	alignedCPUs := cpuset.New()
	numaBits := numaAffinity.GetBits()

	// If align-by-socket policy option is enabled, NUMA based hint is expanded to
	// socket aligned hint. It will ensure that first socket aligned available CPUs are
	// allocated before we try to find CPUs across socket to satisfy allocation request.
	if p.options.AlignBySocket {

// Lock is a no-op used by -copylocks checker from `go vet`.
func (*noCopy) Lock()   {}
func (*noCopy) Unlock() {}

// align64 may be added to structs that must be 64-bit aligned.
// This struct is recognized by a special case in the compiler
// and will not work if copied to any other package.

		if err != nil {
			return nil, err
		}
		if allocateRemainingFrom(preferred.Intersection(aligned)) {
			return allocated, nil
		}
		// Then fallback to allocate from the aligned set if no preferred list
		// is returned (or not enough devices are returned in that list).
		if allocateRemainingFrom(aligned) {
			return allocated, nil
		}

func (s *mspan) refreshPinnerBits() {
	p := s.getPinnerBits()
	if p == nil {
		return
	}

	hasPins := false
	bytes := alignUp(s.pinnerBitSize(), 8)

	// Iterate over each 8-byte chunk and check for pins. Note that
	// newPinnerBits guarantees that pinnerBits will be 8-byte aligned, so we
	// don't have to worry about edge cases, irrelevant bits will simply be
	// zero.

//
// *ptr is uninitialized memory (e.g., memory that's being reused
// for a new allocation) and hence contains only "junk".
//
// memclrNoHeapPointers ensures that if ptr is pointer-aligned, and n
// is a multiple of the pointer size, then any pointer-aligned,
// pointer-sized portion is cleared atomically. Despite the function
// name, this is necessary because this function is the underlying

		// caller reserved spill space.
		p.dstSpill = alignUp(p.dstSpill, uintptr(t.Align_))
		p.dstSpill += t.Size_
	} else {
		// Register assignment failed.
		// Undo the work and stack assign.
		p.parts = oldParts

		// The Go ABI aligns arguments.
		p.dstStackSize = alignUp(p.dstStackSize, uintptr(t.Align_))

		// Copy just the size of the argument. Note that this