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Good day to all. If I've some block device "base" and I've two derived device-mapper devices "derived1" and "derived2" that are copy-on-write layers over top of that base, and I mount the filesystems on those derived block devices and run the same program "foo" from both, does the "foo" running from "derived1" share any [read and execute] memory pages with the "foo" running from "derived2", since the underlying sectors are both from the same position on "base"? The more general question would be about mmap, but I hope this example is clear. "Docker"[1] uses device-mapper in scenarios like the above example and I'm curious if they benefit from shared pages. [1] https://www.docker.com/ |
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