Mach and faulting in the file (Re: GNU Emacs, memory usage, releasing)
Ted Lemon
mellon at nigiri.pa.dec.com
Wed Jan 10 19:08:26 AEST 1990
> The problem is that unless you copy the file on disk you can't back
> out of your edits at the last moment (:q! for vi people). If you're
> going to copy the file you might as well copy it into vmem.
Actually, this isn't a problem with a proper virtual memory system.
If it's done right, you just implement a copy-on-write scheme with a
different version number for the modified file, as with TOPS-20. BTW,
I believe (perhaps wrongly) that Emacs under TOPS-20 mapped its files
and did copy-on-write operations. TOPS-20 has a studly memory
mapper.
_MelloN_
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