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Making all registers caller-saved around context switches is a neat insight, it's intuitive how that could potentially lead to needing fewer instructions to execute when switching contexts.
I haven't yet digested exactly how the stacks are made to work. I think fig 8 should be obvious, but I'm getting stuck on picturing how the system guarantees that frame 1 can't grow into frame 2.
EDIT: Ah, I think I understand. It seems that they're taking advantage of a large virtual address space to give each stack loads of space, rather than them being contiguous like I assumed from fig 8.
> As modern 64-bit address-space is big enough for the allocation of many large continuous stacks [...]