Intercept main loop

Hook do_tick.

How fast does it tick? ~309 Hz (on Julian's 1.6GHz Intel Core i7)

Save/restore state

Call save_state and restore_state.

How much time/space used? 1083.36574 megabytes (1.08336574 gigabytes), 800 milliseconds (for some scenario we forgot to document in more detail).

• Complete copy of disk images (e.g. 1 GB)
• Copy of non-zero 4k pages of memory (e.g. 32 MB)
• Complete copy of svga_memory (e.g. 16MB)
• Other stuff like disk/net/audio/video input/output buffers (e.g. 6MB).