> If there is a better alternative I'm all ears but having /proc and > ifconfig return zeros for error counts while ip link doesn't will lead > to too much confusion IMO. While delayed update of stats is a fact of > life for _years_ now (hence it was backed into the ethtool -C API). How about dev_seq_start() issues a netdev notifier chain event, asking devices which care to update their cached rtnl_link_stats64 counters. They can decide if their cache is too old, and do a blocking read for new values. Once the notifier has completed, dev_seq_start() can then rcu_read_lock() and do the actual collection of stats from the drivers non-blocking. Andrew
