Il 26/06/2013 16:09, Michael R. Hines ha scritto: > *This requires some steps:* > 1. First, maintain a new data structure: something like > "These memory ranges are 'being unpinned'" - block all potential writes > to these addresses until the unpinning completes. > 2. Once the source unpin completes, send the asynchronous control > channel message > to the other side for unpinning. > 2. Mark the data structure and return and allow the migration to continue > with the next RDMA write. > 3. Upon completion of the unpinning on the destination, > respond to the source that it was finished. > 4. Source then clears the data structure for the successfully unpinned > memory ranges. > 5. At this point, one or more writes may (or may not) be blocking on the > unpinned memory areas and will poll the data structure and find that > the unpinning has completed. > 6. Then issue the new writes and proceed as normal. > 7. Repeat step 1.
After more discussion on IRC I think I understand this. It's not trivial, but not super-complex either... it would really be nice to add it to the protocol already in 1.6. Paolo
