[uml-devel] Re: [uml-user] Network lags

["Sven Köhler" <skoehler@upb.de>]

>>what's so bad about it?
> 
> It can put the host at risk.  There's a VM system for a reason, and it needs
> swap in order to be able to back out of memory shortages.  mlocking large
> amounts of memory subverts that and increases the possibility of deadlocking.

good point, but mlocking 128M should be like running the host with 128M 
less. so if i could tell the kernel not to touch a certain memory-area 
on the append-line, should there still be any VM issues?
of course that would need further patching of the host-kernel so that 
UML can access and manage the reserved memory.

>>well, what do you mean with managing the host memory? will be some kind 
>>tool or built-in option of the UML-kernel?
> 
> Both.  There is pluggable memory in UML, and a tool on the host to manage
> memory by moving memory between UMLs and between UMLs and the host.

sound good too, but what i have in mind is a more static thing. even if 
the host goes mad and eats all the memory, i still want to be sure that 
the UML-kernels have their memory region and this won't get swapped out.


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