Re: [uml-devel] Swapping directly to host swap area?

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 01:43, mercoledì 11 febbraio 2004, Jeff Dike ha scritto:
> blaisorblade_spam@yahoo.it said:
> > About this, my idea was that using swap both on the host and on the
> > guests is  not very useful:
>
> My suggestions were aimed at making the host less likely to swap.  There
> are various pathological things which happen when both UML and the host are
> swapping.  Having said that, the host needs to be able to swap UMLs if the
> memory situation is so bad that there is no other choice.
I agree completely.

> > - because the host already sees which pages are accessed and which not
> > (an  access inside UML is an access inside the host); the only
> > difference is that  the host can swap even the guest kernel, while UML
> > not;
>
> UML might have a better idea than the host, though.

It seems to me that the access statistics should be the same ones: I do not 
know thoroughly the way pages are marked as active or swappable (I can check 
in the 2.4 VM description - ask for the address) but if that depends on page 
faulting, then, it seems to me that since guest page fault are even host page 
fault (the UML handling of SIGSEGV is like the host handling of CPU fault 
exceptions, right?) the statistics should be the same. At least In My Very 
Humble Opinion.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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