Am 23.02.2011 17:04, schrieb Anthony Liguori: > On 02/23/2011 10:03 AM, Avi Kivity wrote: >> On 02/23/2011 05:50 PM, Anthony Liguori wrote: >>>> I still don't see. What would you do with thousands of checkpoints? >>> >>> >>> For reverse debugging, if you store checkpoints at a rate of save, >>> every 10ms, and then degrade to storing every 100ms after 1 second, >>> etc. you'll have quite a large number of snapshots pretty quickly. >>> The idea of snapshotting with reverse debugging is that instead of >>> undoing every instruction, you can revert to the snapshot before, and >>> then replay the instruction stream until you get to the desired point >>> in time. >> >> You cannot replay the instruction stream since inputs (interrupts, >> rdtsc or other timers, I/O) will be different. You need Kemari for this. > > Yes, I'm well aware of this. I don't think all the pieces where ever > really there to do this.
So why exactly was this a requirement for internal snapshots to be consider usable in a reasonable way? ;-) Anyway, I actually think with internal snapshots you're better suited to implement something like this than with external snapshots. Kevin
