[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] struct shared_info extensibility (or lack thereof)
While looking at "steal" cpu time accounting, I am running into problems with struct shared_info. Right now it looks like I need to modify struct shared_info, but this is not possible in a backwards compatible way. I think we should change struct shared_info to be extensible, so we can expand it at a future date without breaking the interface. Right now (before 3.0) would be the best time to change the data structure to something extensible. I am thinking it should look something like this: struct shared_info { single variables; padding[]; { vcpu_data, vcpu_time, padding[] } [ MAX_VIRT_CPUS ]; } The reason for putting the vcpu_* structures together on a per virtual cpu basis is that this way we can extend the number of virtual CPUs in the future, without breaking the interface with older guests. The current stared_info struct of two [MAX_VIRT_CPUS] arrays followed by the single variables is just impossible to extend in the future. Any objections to changing the interface now ? -- All Rights Reversed _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |