> Don’t create any file backed writable memory mappings

If you have to create a writable file-backed memory mapping, open it in /dev/shm or /dev/hugepages. You can mount your own hugetlbfs volume with the right permissions.

Creating a big-ass single-writer ring buffer in a series of mapped hugetlb pages is a great way to give downstream code some breathing room. You can have multiple downstream programs, each on its own core, map it read-only, and start and stop them independently. Maintain a map of checkpoints farther back in the ring buffer, and they can pick up again, somewhere back, without missing anything.