Ah oops - I forgot to repeat my mention of copy-on-write from my first post:

On Thursday, February 05, 2026, at 9:30 PM, Alyssa M wrote:
> I tend to think about mmap the same way I do about vfork: with the right 
> virtual memory system and file system it shouldn't be necessary. A 
> combination of demand paging* and copy-on-write* should make read/write of 
> large areas of files as efficient as memory mapping - the main difference 
> being that, with read/write, memory is isolated from both the file and other 
> processes, whereas memory mappingĀ  implies some degree of sharing. On the 
> whole I think I'd rather have the isolation.

Without that it makes no sense! Sorry!
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