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Implement support for multiple sizes huge pages

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This implementation allows Pod to request multiple hugepage resources
of different size and mount hugepage volumes using storage medium
HugePage-<size>, e.g.

spec:
  containers:
    resources:
      requests:
        hugepages-2Mi: 2Mi
        hugepages-1Gi: 2Gi
    volumeMounts:
      - mountPath: /hugepages-2Mi
        name: hugepage-2mi
      - mountPath: /hugepages-1Gi
        name: hugepage-1gi
    ...
  volumes:
    - name: hugepage-2mi
      emptyDir:
        medium: HugePages-2Mi
    - name: hugepage-1gi
      emptyDir:
        medium: HugePages-1Gi

NOTE: This is an alpha feature.
      Feature gate HugePageStorageMediumSize must be enabled for it to work.
This commit is contained in:
Ed Bartosh
2019-10-17 15:25:06 +03:00
parent ddd6d668f6
commit 0eb65bd7da
13 changed files with 148 additions and 51 deletions
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21
pkg/apis/core/v1/helper/helpers.go
View File

@@ -103,6 +103,27 @@ func HugePageUnitSizeFromByteSize(size int64) (string, error) {
return fmt.Sprintf("%d%s", size, hugePageSizeUnitList[idx]), nil
}
// IsHugePageMedium returns true if the volume medium is in 'HugePages[-size]' format
func IsHugePageMedium(medium v1.StorageMedium) bool {
if medium == v1.StorageMediumHugePages {
return true
}
return strings.HasPrefix(string(medium), string(v1.StorageMediumHugePagesPrefix))
}
// HugePageSizeFromMedium returns the page size for the specified huge page medium.
// If the specified input is not a valid huge page medium an error is returned.
func HugePageSizeFromMedium(medium v1.StorageMedium) (resource.Quantity, error) {
if !IsHugePageMedium(medium) {
return resource.Quantity{}, fmt.Errorf("medium: %s is not a hugepage medium", medium)
}
if medium == v1.StorageMediumHugePages {
return resource.Quantity{}, fmt.Errorf("medium: %s doesn't have size information", medium)
}
pageSize := strings.TrimPrefix(string(medium), string(v1.StorageMediumHugePagesPrefix))
return resource.ParseQuantity(pageSize)
}
// IsOvercommitAllowed returns true if the resource is in the default
// namespace and is not hugepages.
func IsOvercommitAllowed(name v1.ResourceName) bool {