#Virtual Memory Wishlist
14-Aug-90 02:40:12
Sb: #116686-#Virtual Memory Wishlist
Fm: Don Curtis/SYSOP 76703,4321
To: Ethan Solomita 70137,3271
Ethan,
Virtual memory doesn't require any hardware except an MMU…so you
can leave Hazy out of it. As to virtual CHIP memory…I doubt that's
practical at this point in time. Imagine the problems that'd be caused by
a page fault in video memory. CHIP RAM used for video memory is
essentially "real time" RAM and it has to be there exactly when needed. It
can't wait for a swap in from disk. Figure the same for RAM used for
audio.
Another use for CHIP is disk buffers….again, not real smart to
page fault a disk buffer, and then have to read it in from disk just to see
if it holds the data you need.
While some of that can certainly be gotten around by locking
certain pages in real memory…by doing that, you've lost the ability to
use VM in the first place…so why build it if you can't use it (for CHIP
RAM that is).
Don