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Add sidecar containers to resource requests computation #2099

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merged 9 commits into from
May 7, 2024
Merged

Add sidecar containers to resource requests computation #2099

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912356a
Add sidecar containers to resource requests computation
IrvingMg Apr 29, 2024
4c147e5
Refactor init containers resource computation
IrvingMg May 2, 2024
e338535
Refactor tests cases using Container wrapper
IrvingMg May 2, 2024
471e39c
Update test cases
IrvingMg May 2, 2024
7ba8d95
Refactor sidecar condition
IrvingMg May 2, 2024
b216698
Update tests
IrvingMg May 2, 2024
48490a6
Update formula to compute resource requests
IrvingMg May 6, 2024
e44dbca
Make init containers resource computation linear
IrvingMg May 7, 2024
053c150
Update init containers resource computation
IrvingMg May 7, 2024
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24 changes: 20 additions & 4 deletions pkg/util/limitrange/limitrange.go
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Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,12 @@ func (s Summary) validatePodSpecContainers(containers []corev1.Container, path *
}

// TotalRequests computes the total resource requests of a pod.
// total = Max( Max(each InitContainerUse) , Sum(SidecarContainers) + Sum(Containers) ) + pod overhead
//
// total = Max( Max(each InitContainerUse) , Sum(SidecarContainers) + Sum(Containers) ) + pod overhead
//
// where:
//
// InitContainerUse(i) = Sum(SidecarContainers with index < i) + InitContainer(i)
func TotalRequests(ps *corev1.PodSpec) corev1.ResourceList {
sumContainers := calculateMainContainersResources(ps.Containers)
maxInitContainers := calculateInitContainersResources(ps.InitContainers)
Expand All @@ -105,16 +110,27 @@ func calculateMainContainersResources(containers []corev1.Container) corev1.Reso
}

func calculateInitContainersResources(initContainers []corev1.Container) corev1.ResourceList {
incrementalSum := calculateSidecarContainersIncrementalSum(initContainers)
total := corev1.ResourceList{}
for i := range initContainers {
sumSidecarContainers := calculateSidecarContainersResources(initContainers[:i])
initContainerUse := resource.MergeResourceListKeepSum(sumSidecarContainers, initContainers[i].Resources.Requests)

initContainerUse := resource.MergeResourceListKeepSum(incrementalSum[i], initContainers[i].Resources.Requests)
total = resource.MergeResourceListKeepMax(total, initContainerUse)
}
return total
}

func calculateSidecarContainersIncrementalSum(initContainers []corev1.Container) []corev1.ResourceList {
results := make([]corev1.ResourceList, len(initContainers))
lastResult := corev1.ResourceList{}
for i := 1; i < len(initContainers); i++ {
if isSidecarContainer(initContainers[i-1]) {
lastResult = resource.MergeResourceListKeepSum(results[i-1], initContainers[i-1].Resources.Requests)
}
results[i] = lastResult
}
return results
}

func calculateSidecarContainersResources(initContainers []corev1.Container) corev1.ResourceList {
total := corev1.ResourceList{}
for i := range initContainers {
Expand Down