On Tue, Mar 06, 2018 at 10:54:18AM +0000, Dr. David Alan Gilbert wrote: [...]
> > Basically above was what I thought - to record the faulted addresses > > with specific PostcopyFD when page fault happened, then we may know > > which page(s) will a PostcopyFD need. But when with that, we'll > > possibly need a lock to protect the information (or any other sync > > method). > > OK, but I think you're suggesting building a whole new data structure to > know which ones need notifying; that sounds like a lot of extra > complexity for not much gain. Yes we may need a new structure (or just a list of addresses?), and indeed I have no idea on how that would help us. I think it depends on how many useless wakeup we will have, and how expensive is each of such a wakeup notification. Again, I think current solution is good enough as long as we don't see explicit blocker on performance side, and we can rethink that when really needed. Thanks, -- Peter Xu
