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tmpfs is backed by host memory and that usage is charged to the container's memory cgroup. A large `tmpfs-size` (or a host-mounted tmpfs) does not give you RAM outside `--memory`, and filling the mount can still OOM the container. Called that out in the intro and limitations, with a pointer to the runtime metrics page. Fixes moby/moby#47967 --------- Signed-off-by: Dean Chen <862469039@qq.com>