On Wed, 30 Jan 2002, Daniel Phillips wrote:
> On January 30, 2002 03:46 pm, Rik van Riel wrote:
> > On Wed, 30 Jan 2002, Daniel Phillips wrote:
> > > |-bash---bash---xinit-+-XFree86
> > > | `-xfwm-+-xfce---gnome-terminal-+-bash---pstree
> >
> > It doesn't matter how deep the tree is, on exec() all
> > previously shared page tables will be blown away.
> >
> > In this part of the tree, I see exactly 2 processes
> > which could be sharing page tables (the two bash
> > processes).
>
> Sure, your point is that there is no problem and the speed of rmap on
> fork is not something to worry about?
No. The point is that we should optimise for fork()+exec(),
not for a long series of consecutive fork()s all sharing the
same page tables.
regards,
Rik
--
"Linux holds advantages over the single-vendor commercial OS"
-- Microsoft's "Competing with Linux" document
http://www.surriel.com/ http://distro.conectiva.com/
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