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Comment by andrewflnr

3 years ago

Are you sure you're not thinking "copy on write" rather than "zero copy"? The latter implies you can predict in advance which pages will be the same forever...

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andrewflnr

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londons_explore  3 years ago

The pages would be copy-on-write, but since this would mostly be for code pages, they would never be written, and therefore never copied.

By 'zero copy', I mean that when a guest tries to read a page, if another guest has that page in RAM, then no copy operation is done to get it into the memory space of the 2nd guest.