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Add easy to follow formulas for Init and Pod effective request/limit calculations #47052

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Add easy to follow formulas for Init and Pod effective request/limit calculations #47052

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6 changes: 6 additions & 0 deletions content/en/docs/concepts/workloads/pods/sidecar-containers.md
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Expand Up @@ -122,11 +122,17 @@ for resource usage apply:
* The highest of any particular resource request or limit defined on all init
containers is the *effective init request/limit*. If any resource has no
resource limit specified this is considered as the highest limit.
```
[effective init request/limit] = max(init-1, ...init-N)
```
* The Pod's *effective request/limit* for a resource is the sum of
[pod overhead](/docs/concepts/scheduling-eviction/pod-overhead/) and the higher of:
* the sum of all non-init containers(app and sidecar containers) request/limit for a
resource
* the effective init request/limit for a resource
```
[effective request/limit] = max(max(init-1, ...init-N), sum(non-init-1, ...non-init-N))
```
* Scheduling is done based on effective requests/limits, which means
init containers can reserve resources for initialization that are not used
during the life of the Pod.
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