3b99747b42
When file-backed memory is configured, it is the only "memory" reported by nova and used by instances, with RAM used in caching capacity. We should be warning users of this and insisting they explicitly configure the '[DEFAULT] reserved_host_memory_mb' config option to 0. However, doing so now would be breaking change. Instead, start logging a warning instead, failing only for the truly broken combination of reserving more file-backed memory than we have allocated. Change-Id: I9619338ad0f60253b628d96543f8ce3ac86242e3 Signed-off-by: Stephen Finucane <stephenfin@redhat.com> Closes-Bug: #1882821