On Mon, 9 Dec 2019 22:02:07 -0500
Richard Damon <rich...@damon-family.org> wrote:

> If we assume that over-committing has been removed, then the fact
> that the fork succeeded is the promise that both processes have the
> right to access all of their address space. Any page that is writable
> needs to have swap space reserved, 

Yes, that's SOP in most systems, and not expensive.  The kernel
need not write anything to swap; it just has to book the space in its
swap account.  

--jkl
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