Ronald Natalie <ron at ronnatalie.com> wrote:
 |vfork() is of use on non-paged (and poorly implemented paging) system\
 |s.    If you implemented the copy-on-write fork() behavior, you’d not\
 | need the vfork KLUDGE.

I think there is currently going on some (i haven't really a glue)
virtually mapped stack in Linux (thread around [1]), and it seems
vfork() there doesn't even copy the page table.  So that seems to
be a measurable difference.

  [1] http://www.openwall.com/lists/kernel-hardening/2016/06/21/10

--steffen