//
// This is an internal function that deals just with the bucket. Prefer update.
// l.lock must be held.
func (l *gcCPULimiterState) accumulate(mutatorTime, gcTime int64) {
	headroom := l.bucket.capacity - l.bucket.fill
	enabled := headroom == 0

	// Let's be careful about three things here:
	// 1. The addition and subtraction, for the invariants.
	// 2. Overflow.
	// 3. Excessive mutation of l.enabled, which is accessed

// how long it takes to call through the scheduler.
// We could be more aggressive and bump this up to 128 ns while still getting
// useful data, but the extra bit doesn't save us that much and the headroom is
// nice to have.
//
// Hitting this target resolution is easy in the nanotime case: just pick a
// division of 64. In the cputicks case it's a bit more complex.
//

# As of March 2021 (go 1.16/amd64), the RSS usage is 2GiB by using cached
# memory of 15GiB.
# This variable can be overwritten at your own risk.
# It's defaulting to 20G to provide some headroom.
readonly KUBE_PARALLEL_BUILD_MEMORY=${KUBE_PARALLEL_BUILD_MEMORY:-20}

readonly KUBE_ALL_TARGETS=(
  "${KUBE_SERVER_TARGETS[@]}"
  "${KUBE_CLIENT_TARGETS[@]}"
  "${KUBE_TEST_TARGETS[@]}"

	Rx XDPRingOffset
	Tx XDPRingOffset
	Fr XDPRingOffset
	Cr XDPRingOffset
}

type XDPUmemReg struct {
	Addr            uint64
	Len             uint64
	Chunk_size      uint32
	Headroom        uint32
	Flags           uint32
	Tx_metadata_len uint32
}

type XDPStatistics struct {
	Rx_dropped               uint64
	Rx_invalid_descs         uint64
	Tx_invalid_descs         uint64

	type deadliner interface {
		Deadline() (time.Time, bool)
	}
	if td, ok := t.(deadliner); ok {
		if deadline, ok := td.Deadline(); ok {
			timeout = time.Until(deadline)
			timeout = timeout * 19 / 20 // Give 5% headroom for cleanup and error-reporting.
		}
	}

	deadline := time.Now().Add(timeout)
	for {
		if fn() {
			return true
		}
		if time.Until(deadline) < pollDuration {
			return false
		}

- Kube-apiserver: gzip compression switched from level 4 to level 1 to improve large list call latencies in exchange for higher network bandwidth usage (10-50% higher). This increases the headroom before very large unpaged list calls exceed request timeout limits. ([#112398](https://github.com/kubernetes/kubernetes/pull/112398), [@shyamjvs](https://github.com/shyamjvs)) [SIG API Machinery]