dynamic_pager(8) on macOS
The text ea293689dab9, as Mac OS X 10.5.8, Mac OS X 10.5.7, Mac OS X 10.5.6, Mac OS X 10.5.5, Mac OS X 10.5.4, Mac OS X 10.5.3, Mac OS X 10.5.2, Mac OS X 10.5.1, Mac OS X 10.5 shipped it.
external storage manager for dynamic pager
Flags it lists
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-E -
-F -
-H -
-L -
-P -
-S