On Wed, 2012-06-06 at 19:57 +0300, Michael S. Tsirkin wrote: > So for virtio since all counters get incremented from bh we can > ensure they are read atomically, simply but reading them > from the correct CPU with bh disabled. > And then we don't need u64_stats_sync at all. >
Really ? How are you going to read 64bit stats from foreign cpus on 32bit arches, without additional cost in fast path ? You should read include/linux/u64_stats_sync.h to fully understand the issues. _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
