> can you actually remove the swapper and/or some major subsystems
> using config?

The swapper, no, I think not.  (Nor do you want to, probably, as much
of the same code is used for things like paging text segments in from
executables.)

Some major subsystems - yes.  Filesystems can be excised fairly cleanly
by removing file-system directives.  Some other subsystems (eg: the
SV-compatible IPC stuff, LKMs, most compat modules, DDB, most device
drivers, IPsec, probably others) can also be removed at config time.

Other subsystems cannot be (eg: AF_LOCAL sockets, the VFS
infrastructure, UVM, probably others).

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