🚀 go-pugleaf

In article <34946@clyde.ATT.COM> wtr@moss.UUCP (Bill Rankin) writes:
>assumption: mach is somewhat similar to unix in it's use of disk
>swapping and paging.

     Bad assumption. MACH does not use the standard 4.2/4.3 method
of swapping/paging; MACH pages directly to a mounted file system.
It allocates inodes on the fly and then writes the pages out as part
of a regular file (but does not mark the inode as a regular file; it's
marked as an unknown type, in case the system crashes and fsck can easily
detect these unreferenced files and remove them as unneeded...). As a
side effect of this method of paging, one no longer needs a separate
partition for paging. One can make the whole disk one big hairy parti-
tion....

>i really don't think it's a good idea to un-mount (or the mach
>equivolent) the one and only filesystem.  remember, this is not
>mush-dos.  we just (probably) can't pop the OD out any old time we
>want to and plug in the new one.  nor can we eat up all the memory
>with a big fat juicey ram-disk without crashing the system.
>(remember we need program *and* swap space)
>
>i wellcome pointers on mach internals, etc... any mach gurus 
>reading?

     Well, since MACH is binary compatible with 4.3 BSD, the MACH
equivalent is unmount. But you're right about mounting/unmounting
the one and only file system. If the floptical (love that word!! (-:)
drive is the only drive, you can't easily swap disks like the Mac...


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Inews
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