Itamar Holder a30410d9ce LimitedSwap: Automatically configure swap limit for Burstable QoS Pods ...

After this commit, when LimitedSwap is enabled,
containers would get swap acess limited with respect
the container memory request, total physical memory
on the node, and the swap size on the node.

Pods of Best-Effort / Guaranteed QoS classes don't get
to swap. In addition, container with memory requests
that are equal to their memory limits also don't get to
swap.

The swap limitation is calculated in the following way:
1. Calculate the container's memory proportionate to the node's memory:
- Divide the container's memory request by the total node's physical memory.
  Let's call this value ContainerMemoryProportion.

2. Multiply the container memory proportion by the available
swap memory for Pods:
Meaning: ContainerMemoryProportion * TotalPodsSwapAvailable.

Fore more information:
https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/2400-node-swap/README.md

Signed-off-by: Itamar Holder <iholder@redhat.com>

2023-07-14 14:52:28 +03:00

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