Sounds like somebody is playing tricks with virtual addressing, yeah. See BIBOP (1980) [1] for an example, though it is not used literally in current garbage co

Sounds like somebody is playing tricks with virtual addressing, yeah. See BIBOP (1980) [1] for an example, though it is not used literally in current garbage collectors as far as I am aware. Or look at what AddressSanitizer does with its nominal terabytes of “shadow memory”[2]. Chrome has a bewildering variety of low-level stuff in it, to save memory among other things[3], so it wouldn’t surprise me in the least to learn there was virtual-memory tagging somewhere in there, too. [1] https://foldoc.org/Big+bag+of+pages https://foldoc.org/Big+bag+of+pages [2] https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm https://github.com/google/sanitizers/wiki/AddressSanitizerAl... [3] https://v8.dev/blog/oilpan-pointer-compression https://v8.dev/blog/oilpan-pointer-compression