Messages in this thread | | | Date | Wed, 30 Jan 2002 13:54:59 -0200 (BRST) | From | Rik van Riel <> | Subject | Re: Note describing poor dcache utilization under high memory pressure |
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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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