mount_tmpfs(8) on OpenBSD
The text 2084c69971cb, as OpenBSD 7.0, OpenBSD 6.9, OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3, OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7 shipped it.
mount an efficient memory file system
Flags it lists
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-g -
-m -
-n -
-o -
-s -
-u