Hello Andrea, On Mon, Apr 03, 2017 at 06:30:34PM +0200, Andrea Arcangeli wrote: > Hello Mike, > > On Mon, Apr 03, 2017 at 06:10:24PM +0300, Mike Rapoport wrote: > > Actually, I've found these details in /proc useful when I was experimenting > > with checkpoint-restore of an application that uses userfaultfd. With > > interface in /proc/<pid>/ we know exactly which process use userfaultfd and > > can act appropriately. > > You've to be somewhat serialized by other means though, because > "exactly" has a limit with fdinfo. For example by the time read() > returns, the uffd may have been closed already by the app (just the > uffd isn't ->release()d yet as the last fput has yet to run, the > fdinfo runs the last fput in such case). As long as you can cope with > this and you've a stable fdinfo it's ok. > Well, by the time CRIU checkpoints open file descriptors, the process is already stopped, hence we are not racing with anything here. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
