The basic idea is the same as ReVirt, but there are a lot of different details because rr has to run as a pure user-space Linux application whereas ReVirt was b

The basic idea is the same as ReVirt, but there are a lot of different details because rr has to run as a pure user-space Linux application whereas ReVirt was baked into the hypervisor. For rr to run efficiently we have to use Linux APIs in creative ways. https://arxiv.org/abs/1705.05937 https://arxiv.org/abs/1705.05937 has more details.