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ReVirt logs non-deterministic inputs at the hypervisor level. RR will be recording these inputs at the Kernel level. So this makes the inability to replay the O
by DSingularity 8y ago
ReVirt logs non-deterministic inputs at the hypervisor level. RR will be recording these inputs at the Kernel level. So this makes the inability to replay the OS execution the biggest difference.
- MarkUndo 8y agoInterestingly, hypervisor-level logging of this stuff is both harder (because it has the constraints of kernel-level code) and simpler (because the non-deterministic behaviours are fewer and better-documented at the hardware level than the Linux API level!) I think it's very likely that, overall, recording a single process is substantially more complex to implement than recording a whole VM. (With significant caveats - recording a whole VM with good performance is going to be hard and making it really useful probably is a whole load of extra code)