Serge E. Hallyn wrote: > Quoting Oren Laadan ([email protected]): >> Cool ! >> >> So what do we have working now for 64 bit kernel (for 32 bit kernel >> we know it works...): >> >> 'restart' checkpointed >> program program >> ---------------------------------------- >> 64bit 64bit -> works >> 32bit 32bit -> works >> >> 64bit 32bit -> ????? > > Actually the other way around works - /bin/restart_32 < 64bit.out > works just fine. /bin/restart_64 < 32bit.out does not. The reason > is that destroy_mm() ends up calling do_munmap on a 64-bit mapping > after the switch to 32-bit had been made, and it refuses bc > vma->vm_start > TASK_SIZE. > > Perhaps getting it to work will be as simple as temporarily switching > back to 64-bit during destroy_mm().
Interesting, I didn't think about it. So yes, switching temporarily should work. An alternative we can do the call destroy_mm() earlier, as it may suit us. > >> Does it make sense to allow the opposite transition: 'restart' starts >> as a 32bit and becomes a 64bit after it restores the state from the >> image ? >> >> And what about if you checkpoint on a 32 bit kernel and try to >> restart on a 64 bit kernel, and vice versa ? (in both cases, the >> program of course is 32bit, and we can assume same physical host >> for now). > > I have no hw right now where I could test such a thing. Do you? > Couldn't you use the same machine you are using - just reboot it between checkpoint and restart with a 32bit kernel ... ? Oren. _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
