Messages in this thread | | | Subject | Re: Demand paging - Kernel | Date | Mon, 17 Mar 2003 17:59:54 -0400 | From | Horst von Brand <> |
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Tommy Reynolds <reynolds@redhat.com> said: > Uttered "Breno" <brenosp@brasilsec.com.br>, spoke thus: > > There is a possibility to do demand paging in kernel space address ?
> No. The entire kernel, and all of its data structures, are resident in > memory all of the time.
In the current Linux kernel, that is.
> Kernel demand paging is not possible,
It is certainly possible (you could mark areas that don't contain currently used stuff for pageout). It is extremely hairy to do right (just see the mess with module loading/unloading, which is some of the same stuff, very tamed).
> not > necessary and not implemented.
The cost of doing it right in a monolitic kernel would probably outweigh the gains manyfold, and require massive redesign for Linux. In microkernels it is a lot easier to do (but their performance sucks baby elephants through straws, so they are moot :-) -- Dr. Horst H. von Brand User #22616 counter.li.org Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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