Re: Swap support

Javier Sedano
2002-04-22T13:42:04Z

Harry Kalogirou wrote:
>
'> Yesterday I commited to the CVS some experimental swap support code,
> based on Alan's work on the subject. Ofcourse this code is not included
> in the default configuration and is not for _actual_ use, since as I
> said is experimental. Apart from that if you set the swap partition in
> malloc.c you and enable swapping you can enjoy an 8086 system use
> _virtual_ memory!
>

Great!

I've been looking for it in the code, and found nothing about it's
configuration (setting the partition and the size, activating it...)...
can someone (Harry, Alan) give us a few words about how to do so?
And by the way... can you write a technical description about how is it
done? The main problem with swap in minix was (is) that processes
waiting for IO (waiting for a message from FS) can not be swapped in,
because they would meet a deadlock when trying to swap out (for FS is
needed again to do the swapping out, but it is frozen sending the
message to the process, because FS is not reentrant/concurrent in
minix)... and obviously processes waiting for IO are those best suited
to be swapped in.

Excuse my bad English... from memory to disk is "swap in" or "swap
out"?

--
Daría todo lo que sé por la mitad de lo que ignoro
--------
Javier Sedano Jarillo http://www.it.uc3m.es/~jsedano
jsedano@dit.upm.es (*)
jsedano@ieee.org
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