atomic.StoreInt64(&e.cachedSec, t)
	})
	acc := e.cached.Load()
	if lastT := atomic.LoadInt64(&e.cachedSec); lastT != t {
		// Check if lastT was changed by someone else.
		if atomic.CompareAndSwapInt64(&e.cachedSec, lastT, t) {
			// Now we swap in a new.
			newAcc := &AccElem{}
			old := e.cached.Swap(newAcc)
			var a AccElem
			a.Size = atomic.LoadInt64(&old.Size)
			a.Total = atomic.LoadInt64(&old.Total)

pkg sync/atomic, func AddUint64(*uint64, uint64) uint64
pkg sync/atomic, func AddUintptr(*uintptr, uintptr) uintptr
pkg sync/atomic, func CompareAndSwapInt32(*int32, int32, int32) bool
pkg sync/atomic, func CompareAndSwapInt64(*int64, int64, int64) bool
pkg sync/atomic, func CompareAndSwapPointer(*unsafe.Pointer, unsafe.Pointer, unsafe.Pointer) bool
pkg sync/atomic, func CompareAndSwapUint32(*uint32, uint32, uint32) bool