mmap'ed memory counts as that "reclaimable cache", which isn't always reclaimable (dirty or active pages are not immediately reclaimable). But Kubernetes memory

mmap'ed memory counts as that "reclaimable cache", which isn't always reclaimable (dirty or active pages are not immediately reclaimable). But Kubernetes memory accounting assumes that the page cache is always reclaimable. This creates a lot of surprises and unexpected OOMs. https://github.com/kubernetes/kubernetes/issues/43916 https://github.com/kubernetes/kubernetes/issues/43916