helpers.go
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/*
/*
Copyright 2014 The Kubernetes Authors.
Copyright 2024 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
See the License for the specific language governing permissions and
limitations under the License.
limitations under the License.
*/
*/
package resource
package resource
import (
import (
"fmt"
"math"
"strconv"
"strings"
v1 "k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
)
podutil "k8s.io/kubernetes/pkg/api/v1/pod"
// ContainerType signifies container type
type ContainerType int
const (
// Containers is for normal containers
Containers ContainerType = 1 << iota
// InitContainers is for init containers
InitContainers
)
)
// PodResourcesOptions controls the behavior of PodRequests and PodLimits.
// PodResourcesOptions controls the behavior of PodRequests and PodLimits.
type PodResourcesOptions struct {
type PodResourcesOptions struct {
// Reuse, if provided will be reused to accumulate resources and returned by the PodRequests or PodLimits
// Reuse, if provided will be reused to accumulate resources and returned by the PodRequests or PodLimits
// functions. All existing values in Reuse will be lost.
// functions. All existing values in Reuse will be lost.
Reuse v1.ResourceList
Reuse v1.ResourceList
// InPlacePodVerticalScalingEnabled indicates that the in-place pod vertical scaling feature gate is enabled.
// InPlacePodVerticalScalingEnabled indicates that the in-place pod vertical scaling feature gate is enabled.
InPlacePodVerticalScalingEnabled bool
InPlacePodVerticalScalingEnabled bool
// ExcludeOverhead controls if pod overhead is excluded from the calculation.
// ExcludeOverhead controls if pod overhead is excluded from the calculation.
ExcludeOverhead bool
ExcludeOverhead bool
// ContainerFn is called with the effective resources required for each container within the pod.
// ContainerFn is called with the effective resources required for each container within the pod.
ContainerFn func(res v1.ResourceList, containerType podutil.ContainerType)
ContainerFn func(res v1.ResourceList, containerType ContainerType)
// NonMissingContainerRequests if provided will replace any missing container level requests for the specified resources
// NonMissingContainerRequests if provided will replace any missing container level requests for the specified resources
// with the given values. If the requests for those resources are explicitly set, even if zero, they will not be modified.
// with the given values. If the requests for those resources are explicitly set, even if zero, they will not be modified.
NonMissingContainerRequests v1.ResourceList
NonMissingContainerRequests v1.ResourceList
}
}
// PodRequests computes the pod requests per the PodResourcesOptions supplied. If PodResourcesOptions is nil, then
// PodRequests computes the pod requests per the PodResourcesOptions supplied. If PodResourcesOptions is nil, then
// the requests are returned including pod overhead. The computation is part of the API and must be reviewed
// the requests are returned including pod overhead. The computation is part of the API and must be reviewed
// as an API change.
// as an API change.
func PodRequests(pod *v1.Pod, opts PodResourcesOptions) v1.ResourceList {
func PodRequests(pod *v1.Pod, opts PodResourcesOptions) v1.ResourceList {
// attempt to reuse the maps if passed, or allocate otherwise
// attempt to reuse the maps if passed, or allocate otherwise
reqs := reuseOrClearResourceList(opts.Reuse)
reqs := reuseOrClearResourceList(opts.Reuse)
var containerStatuses map[string]*v1.ContainerStatus
var containerStatuses map[string]*v1.ContainerStatus
if opts.InPlacePodVerticalScalingEnabled {
if opts.InPlacePodVerticalScalingEnabled {
containerStatuses = make(map[string]*v1.ContainerStatus, len(pod.Status.ContainerStatuses))
containerStatuses = make(map[string]*v1.ContainerStatus, len(pod.Status.ContainerStatuses))
for i := range pod.Status.ContainerStatuses {
for i := range pod.Status.ContainerStatuses {
containerStatuses[pod.Status.ContainerStatuses[i].Name] = &pod.Status.ContainerStatuses[i]
containerStatuses[pod.Status.ContainerStatuses[i].Name] = &pod.Status.ContainerStatuses[i]
}
}
}
}
for _, container := range pod.Spec.Containers {
for _, container := range pod.Spec.Containers {
containerReqs := container.Resources.Requests
containerReqs := container.Resources.Requests
if opts.InPlacePodVerticalScalingEnabled {
if opts.InPlacePodVerticalScalingEnabled {
cs, found := containerStatuses[container.Name]
cs, found := containerStatuses[container.Name]
if found {
if found {
if pod.Status.Resize == v1.PodResizeStatusInfeasible {
if pod.Status.Resize == v1.PodResizeStatusInfeasible {
containerReqs = cs.AllocatedResources.DeepCopy()
containerReqs = cs.AllocatedResources.DeepCopy()
} else {
} else {
containerReqs = max(container.Resources.Requests, cs.AllocatedResources)
containerReqs = max(container.Resources.Requests, cs.AllocatedResources)
}
}
}
}
}
}
if len(opts.NonMissingContainerRequests) > 0 {
if len(opts.NonMissingContainerRequests) > 0 {
containerReqs = applyNonMissing(containerReqs, opts.NonMissingContainerRequests)
containerReqs = applyNonMissing(containerReqs, opts.NonMissingContainerRequests)
}
}
if opts.ContainerFn != nil {
if opts.ContainerFn != nil {
opts.ContainerFn(containerReqs, podutil.Containers)
opts.ContainerFn(containerReqs, Containers)
}
}
addResourceList(reqs, containerReqs)
addResourceList(reqs, containerReqs)
}
}
restartableInitContainerReqs := v1.ResourceList{}
restartableInitContainerReqs := v1.ResourceList{}
initContainerReqs := v1.ResourceList{}
initContainerReqs := v1.ResourceList{}
// init containers define the minimum of any resource
// init containers define the minimum of any resource
// Note: In-place resize is not allowed for InitContainers, so no need to check for ResizeStatus value
// Note: In-place resize is not allowed for InitContainers, so no need to check for ResizeStatus value
//
//
// Let's say `InitContainerUse(i)` is the resource requirements when the i-th
// Let's say `InitContainerUse(i)` is the resource requirements when the i-th
// init container is initializing, then
// init container is initializing, then
// `InitContainerUse(i) = sum(Resources of restartable init containers with index < i) + Resources of i-th init container`.
// `InitContainerUse(i) = sum(Resources of restartable init containers with index < i) + Resources of i-th init container`.
//
//
// See https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/753-sidecar-containers#exposing-pod-resource-requirements for the detail.
// See https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/753-sidecar-containers#exposing-pod-resource-requirements for the detail.
for _, container := range pod.Spec.InitContainers {
for _, container := range pod.Spec.InitContainers {
containerReqs := container.Resources.Requests
containerReqs := container.Resources.Requests
if len(opts.NonMissingContainerRequests) > 0 {
if len(opts.NonMissingContainerRequests) > 0 {
containerReqs = applyNonMissing(containerReqs, opts.NonMissingContainerRequests)
containerReqs = applyNonMissing(containerReqs, opts.NonMissingContainerRequests)
}
}
if container.RestartPolicy != nil && *container.RestartPolicy == v1.ContainerRestartPolicyAlways {
if container.RestartPolicy != nil && *container.RestartPolicy == v1.ContainerRestartPolicyAlways {
// and add them to the resulting cumulative container requests
// and add them to the resulting cumulative container requests
addResourceList(reqs, containerReqs)
addResourceList(reqs, containerReqs)
// track our cumulative restartable init container resources
// track our cumulative restartable init container resources
addResourceList(restartableInitContainerReqs, containerReqs)
addResourceList(restartableInitContainerReqs, containerReqs)
containerReqs = restartableInitContainerReqs
containerReqs = restartableInitContainerReqs
} else {
} else {
tmp := v1.ResourceList{}
tmp := v1.ResourceList{}
addResourceList(tmp, containerReqs)
addResourceList(tmp, containerReqs)
addResourceList(tmp, restartableInitContainerReqs)
addResourceList(tmp, restartableInitContainerReqs)
containerReqs = tmp
containerReqs = tmp
}
}
if opts.ContainerFn != nil {
if opts.ContainerFn != nil {
opts.ContainerFn(containerReqs, podutil.InitContainers)
opts.ContainerFn(containerReqs, InitContainers)
}
}
maxResourceList(initContainerReqs, containerReqs)
maxResourceList(initContainerReqs, containerReqs)
}
}
maxResourceList(reqs, initContainerReqs)
maxResourceList(reqs, initContainerReqs)
// Add overhead for running a pod to the sum of requests if requested:
// Add overhead for running a pod to the sum of requests if requested:
if !opts.ExcludeOverhead && pod.Spec.Overhead != nil {
if !opts.ExcludeOverhead && pod.Spec.Overhead != nil {
addResourceList(reqs, pod.Spec.Overhead)
addResourceList(reqs, pod.Spec.Overhead)
}
}
return reqs
return reqs
}
}
// applyNonMissing will return a copy of the given resource list with any missing values replaced by the nonMissing values
// applyNonMissing will return a copy of the given resource list with any missing values replaced by the nonMissing values
func applyNonMissing(reqs v1.ResourceList, nonMissing v1.ResourceList) v1.ResourceList {
func applyNonMissing(reqs v1.ResourceList, nonMissing v1.ResourceList) v1.ResourceList {
cp := v1.ResourceList{}
cp := v1.ResourceList{}
for k, v := range reqs {
for k, v := range reqs {
cp[k] = v.DeepCopy()
cp[k] = v.DeepCopy()
}
}
for k, v := range nonMissing {
for k, v := range nonMissing {
if _, found := reqs[k]; !found {
if _, found := reqs[k]; !found {
rk := cp[k]
rk := cp[k]
rk.Add(v)
rk.Add(v)
cp[k] = rk
cp[k] = rk
}
}
}
}
return cp
return cp
}
}
// PodLimits computes the pod limits per the PodResourcesOptions supplied. If PodResourcesOptions is nil, then
// PodLimits computes the pod limits per the PodResourcesOptions supplied. If PodResourcesOptions is nil, then
// the limits are returned including pod overhead for any non-zero limits. The computation is part of the API and must be reviewed
// the limits are returned including pod overhead for any non-zero limits. The computation is part of the API and must be reviewed
// as an API change.
// as an API change.
func PodLimits(pod *v1.Pod, opts PodResourcesOptions) v1.ResourceList {
func PodLimits(pod *v1.Pod, opts PodResourcesOptions) v1.ResourceList {
// attempt to reuse the maps if passed, or allocate otherwise
// attempt to reuse the maps if passed, or allocate otherwise
limits := reuseOrClearResourceList(opts.Reuse)
limits := reuseOrClearResourceList(opts.Reuse)
for _, container := range pod.Spec.Containers {
for _, container := range pod.Spec.Containers {
if opts.ContainerFn != nil {
if opts.ContainerFn != nil {
opts.ContainerFn(container.Resources.Limits, podutil.Containers)
opts.ContainerFn(container.Resources.Limits, Containers)
}
}
addResourceList(limits, container.Resources.Limits)
addResourceList(limits, container.Resources.Limits)
}
}
restartableInitContainerLimits := v1.ResourceList{}
restartableInitContainerLimits := v1.ResourceList{}
initContainerLimits := v1.ResourceList{}
initContainerLimits := v1.ResourceList{}
// init containers define the minimum of any resource
// init containers define the minimum of any resource
//
//
// Let's say `InitContainerUse(i)` is the resource requirements when the i-th
// Let's say `InitContainerUse(i)` is the resource requirements when the i-th
// init container is initializing, then
// init container is initializing, then
// `InitContainerUse(i) = sum(Resources of restartable init containers with index < i) + Resources of i-th init container`.
// `InitContainerUse(i) = sum(Resources of restartable init containers with index < i) + Resources of i-th init container`.
//
//
// See https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/753-sidecar-containers#exposing-pod-resource-requirements for the detail.
// See https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/753-sidecar-containers#exposing-pod-resource-requirements for the detail.
for _, container := range pod.Spec.InitContainers {
for _, container := range pod.Spec.InitContainers {
containerLimits := container.Resources.Limits
containerLimits := container.Resources.Limits
// Is the init container marked as a restartable init container?
// Is the init container marked as a restartable init container?
if container.RestartPolicy != nil && *container.RestartPolicy == v1.ContainerRestartPolicyAlways {
if container.RestartPolicy != nil && *container.RestartPolicy == v1.ContainerRestartPolicyAlways {
addResourceList(limits, containerLimits)
addResourceList(limits, containerLimits)
// track our cumulative restartable init container resources
// track our cumulative restartable init container resources
addResourceList(restartableInitContainerLimits, containerLimits)
addResourceList(restartableInitContainerLimits, containerLimits)
containerLimits = restartableInitContainerLimits
containerLimits = restartableInitContainerLimits
} else {
} else {
tmp := v1.ResourceList{}
tmp := v1.ResourceList{}
addResourceList(tmp, containerLimits)
addResourceList(tmp, containerLimits)
addResourceList(tmp, restartableInitContainerLimits)
addResourceList(tmp, restartableInitContainerLimits)
containerLimits = tmp
containerLimits = tmp
}
}
if opts.ContainerFn != nil {
if opts.ContainerFn != nil {
opts.ContainerFn(containerLimits, podutil.InitContainers)
opts.ContainerFn(containerLimits, InitContainers)
}
}
maxResourceList(initContainerLimits, containerLimits)
maxResourceList(initContainerLimits, containerLimits)
}
}
maxResourceList(limits, initContainerLimits)
maxResourceList(limits, initContainerLimits)
// Add overhead to non-zero limits if requested:
// Add overhead to non-zero limits if requested:
if !opts.ExcludeOverhead && pod.Spec.Overhead != nil {
if !opts.ExcludeOverhead && pod.Spec.Overhead != nil {
for name, quantity := range pod.Spec.Overhead {
for name, quantity := range pod.Spec.Overhead {
if value, ok := limits[name]; ok && !value.IsZero() {
if value, ok := limits[name]; ok && !value.IsZero() {
value.Add(quantity)
value.Add(quantity)
limits[name] = value
limits[name] = value
}
}
}
}
}
}
return limits
return limits
}
}
// addResourceList adds the resources in newList to list.
// addResourceList adds the resources in newList to list.
func addResourceList(list, newList v1.ResourceList) {
func addResourceList(list, newList v1.ResourceList) {
for name, quantity := range newList {
for name, quantity := range newList {
if value, ok := list[name]; !ok {
if value, ok := list[name]; !ok {
list[name] = quantity.DeepCopy()
list[name] = quantity.DeepCopy()
} else {
} else {
value.Add(quantity)
value.Add(quantity)
list[name] = value
list[name] = value
}
}
}
}
}
}
// maxResourceList sets list to the greater of list/newList for every resource in newList
// maxResourceList sets list to the greater of list/newList for every resource in newList
func maxResourceList(list, newList v1.ResourceList) {
func maxResourceList(list, newList v1.ResourceList) {
for name, quantity := range newList {
for name, quantity := range newList {
if value, ok := list[name]; !ok || quantity.Cmp(value) > 0 {
if value, ok := list[name]; !ok || quantity.Cmp(value) > 0 {
list[name] = quantity.DeepCopy()
list[name] = quantity.DeepCopy()
}
}
}
}
}
}
// max returns the result of max(a, b) for each named resource and is only used if we can't
// max returns the result of max(a, b) for each named resource and is only used if we can't
// accumulate into an existing resource list
// accumulate into an existing resource list
func max(a v1.ResourceList, b v1.ResourceList) v1.ResourceList {
func max(a v1.ResourceList, b v1.ResourceList) v1.ResourceList {
result := v1.ResourceList{}
result := v1.ResourceList{}
for key, value := range a {
for key, value := range a {
if other, found := b[key]; found {
if other, found := b[key]; found {
if value.Cmp(other) <= 0 {
if value.Cmp(other) <= 0 {
result[key] = other.DeepCopy()
result[key] = other.DeepCopy()
continue
continue
}
}
}
}
result[key] = value.DeepCopy()
result[key] = value.DeepCopy()
}
}
for key, value := range b {
for key, value := range b {
if _, found := result[key]; !found {
if _, found := result[key]; !found {
result[key] = value.DeepCopy()
result[key] = value.DeepCopy()
}
}
}
}
return result
return result
}
}
// reuseOrClearResourceList is a helper for avoiding excessive allocations of
// reuseOrClearResourceList is a helper for avoiding excessive allocations of
// resource lists within the inner loop of resource calculations.
// resource lists within the inner loop of resource calculations.
func reuseOrClearResourceList(reuse v1.ResourceList) v1.ResourceList {
func reuseOrClearResourceList(reuse v1.ResourceList) v1.ResourceList {
if reuse == nil {
if reuse == nil {
return make(v1.ResourceList, 4)
return make(v1.ResourceList, 4)
}
}
for k := range reuse {
for k := range reuse {
delete(reuse, k)
delete(reuse, k)
}
}
return reuse
return reuse
}
}
// GetResourceRequestQuantity finds and returns the request quantity for a specific resource.
func GetResourceRequestQuantity(pod *v1.Pod, resourceName v1.ResourceName) resource.Quantity {
requestQuantity := resource.Quantity{}
switch resourceName {
case v1.ResourceCPU:
requestQuantity = resource.Quantity{Format: resource.DecimalSI}
case v1.ResourceMemory, v1.ResourceStorage, v1.ResourceEphemeralStorage:
requestQuantity = resource.Quantity{Format: resource.BinarySI}
default:
requestQuantity = resource.Quantity{Format: resource.DecimalSI}
}
for _, container := range pod.Spec.Containers {
if rQuantity, ok := container.Resources.Requests[resourceName]; ok {
requestQuantity.Add(rQuantity)
}
}
for _, container := range pod.Spec.InitContainers {
if rQuantity, ok := container.Resources.Requests[resourceName]; ok {
if requestQuantity.Cmp(rQuantity) < 0 {
requestQuantity = rQuantity.DeepCopy()
}
}
}
// Add overhead for running a pod
// to the total requests if the resource total is non-zero
if pod.Spec.Overhead != nil {
if podOverhead, ok := pod.Spec.Overhead[resourceName]; ok && !requestQuantity.IsZero() {
requestQuantity.Add(podOverhead)
}
}
return requestQuantity
}
// GetResourceRequest finds and returns the request value for a specific resource.
func GetResourceRequest(pod *v1.Pod, resource v1.ResourceName) int64 {
if resource == v1.ResourcePods {
return 1
}
requestQuantity := GetResourceRequestQuantity(pod, resource)
if resource == v1.ResourceCPU {
return requestQuantity.MilliValue()
}
return requestQuantity.Value()
}
// ExtractResourceValueByContainerName extracts the value of a resource
// by providing container name
func ExtractResourceValueByContainerName(fs *v1.ResourceFieldSelector, pod *v1.Pod, containerName string) (string, error) {
container, err := findContainerInPod(pod, containerName)
if err != nil {
return "", err
}
return ExtractContainerResourceValue(fs, container)
}
// ExtractResourceValueByContainerNameAndNodeAllocatable extracts the value of a resource
// by providing container name and node allocatable
func ExtractResourceValueByContainerNameAndNodeAllocatable(fs *v1.ResourceFieldSelector, pod *v1.Pod, containerName string, nodeAllocatable v1.ResourceList) (string, error) {
realContainer, err := findContainerInPod(pod, containerName)
if err != nil {
return "", err
}
container := realContainer.DeepCopy()
MergeContainerResourceLimits(container, nodeAllocatable)
return ExtractContainerResourceValue(fs, container)
}
// ExtractContainerResourceValue extracts the value of a resource
// in an already known container
func ExtractContainerResourceValue(fs *v1.ResourceFieldSelector, container *v1.Container) (string, error) {
divisor := resource.Quantity{}
if divisor.Cmp(fs.Divisor) == 0 {
divisor = resource.MustParse("1")
} else {
divisor = fs.Divisor
}
switch fs.Resource {
case "limits.cpu":
return convertResourceCPUToString(container.Resources.Limits.Cpu(), divisor)
case "limits.memory":
return convertResourceMemoryToString(container.Resources.Limits.Memory(), divisor)
case "limits.ephemeral-storage":
return convertResourceEphemeralStorageToString(container.Resources.Limits.StorageEphemeral(), divisor)
case "requests.cpu":
return convertResourceCPUToString(container.Resources.Requests.Cpu(), divisor)
case "requests.memory":
return convertResourceMemoryToString(container.Resources.Requests.Memory(), divisor)
case "requests.ephemeral-storage":
return convertResourceEphemeralStorageToString(container.Resources.Requests.StorageEphemeral(), divisor)
}
// handle extended standard resources with dynamic names
// example: requests.hugepages-<pageSize> or limits.hugepages-<pageSize>
if strings.HasPrefix(fs.Resource, "requests.") {
resourceName := v1.ResourceName(strings.TrimPrefix(fs.Resource, "requests."))
if IsHugePageResourceName(resourceName) {
return convertResourceHugePagesToString(container.Resources.Requests.Name(resourceName, resource.BinarySI), divisor)
}
}
if strings.HasPrefix(fs.Resource, "limits.") {
resourceName := v1.ResourceName(strings.TrimPrefix(fs.Resource, "limits."))
if IsHugePageResourceName(resourceName) {
return convertResourceHugePagesToString(container.Resources.Limits.Name(resourceName, resource.BinarySI), divisor)
}
}
return "", fmt.Errorf("unsupported container resource : %v", fs.Resource)
}
// convertResourceCPUToString converts cpu value to the format of divisor and returns
// ceiling of the value.
func convertResourceCPUToString(cpu *resource.Quantity, divisor resource.Quantity) (string, error) {
c := int64(math.Ceil(float64(cpu.MilliValue()) / float64(divisor.MilliValue())))
return strconv.FormatInt(c, 10), nil
}
// convertResourceMemoryToString converts memory value to the format of divisor and returns
// ceiling of the value.
func convertResourceMemoryToString(memory *resource.Quantity, divisor resource.Quantity) (string, error) {
m := int64(math.Ceil(float64(memory.Value()) / float64(divisor.Value())))
return strconv.FormatInt(m, 10), nil
}
// convertResourceHugePagesToString converts hugepages value to the format of divisor and returns
// ceiling of the value.
func convertResourceHugePagesToString(hugePages *resource.Quantity, divisor resource.Quantity) (string, error) {
m := int64(math.Ceil(float64(hugePages.Value()) / float64(divisor.Value())))
return strconv.FormatInt(m, 10), nil
}
// convertResourceEphemeralStorageToString converts ephemeral storage value to the format of divisor and returns
// ceiling of the value.
func convertResourceEphemeralStorageToString(ephemeralStorage *resource.Quantity, divisor resource.Quantity) (string, error) {
m := int64(math.Ceil(float64(ephemeralStorage.Value()) / float64(divisor.Value())))
return strconv.FormatInt(m, 10), nil
}
// findContainerInPod finds a container by its name in the provided pod
func findContainerInPod(pod *v1.Pod, containerName string) (*v1.Container, error) {
for _, container := range pod.Spec.Containers {
if container.Name == containerName {
return &container, nil
}
}
for _, container := range pod.Spec.InitContainers {
if container.Name == containerName {
return &container, nil
}
}
return nil, fmt.Errorf("container %s not found", containerName)
}
// MergeContainerResourceLimits checks if a limit is applied for
// the container, and if not, it sets the limit to the passed resource list.
func MergeContainerResourceLimits(container *v1.Container,
allocatable v1.ResourceList) {
if container.Resources.Limits == nil {
container.Resources.Limits = make(v1.ResourceList)
}
// NOTE: we exclude hugepages-* resources because hugepages are never overcommitted.
// This means that the container always has a limit specified.
for _, resource := range []v1.ResourceName{v1.ResourceCPU, v1.ResourceMemory, v1.ResourceEphemeralStorage} {
if quantity, exists := container.Resources.Limits[resource]; !exists || quantity.IsZero() {
if cap, exists := allocatable[resource]; exists {
container.Resources.Limits[resource] = cap.DeepCopy()
}
}
}
}
// IsHugePageResourceName returns true if the resource name has the huge page
// resource prefix.
func IsHugePageResourceName(name v1.ResourceName) bool {
return strings.HasPrefix(string(name), v1.ResourceHugePagesPrefix)
}