Re: Question on the rmap VM

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Sun Mar 03 2002 - 08:40:44 EST


> I have a question on the rmap VM. What is the swap requierment for it?
> I remember the previous Rik van Riel VM required twice the amount of
> swapspace as memory to run effectively as many people were complaining about
> that. I read a while ago that the switch in 2.4.10 to the new AA VM fixed
> that issue. Will rmap bring back that 2x requirement? Thanks.

That issue was fixed before the VM was changed - its actually a seperate
matter of when the kernel went to the trouble of trying to dig stuff out
of swap.

If you have a 2.4.18-ac2 kernel you can also see the worst case swap
usage requirement at the current moment in /proc/meminfo as
"Committed AS"

Alan
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