On Wed, Mar 01, 2017 at 10:15:31PM +0000, Weiny, Ira wrote: > > On the call we discussed that today there is no 'incarnation' > > value exposed for the uverbs%. You suggested an optimization by > > using the cdev's file creation timestamp as option for libibverbs > > to understand that the driver did or did-not restart since mapping > > of that ibv_device. Not the cdev, read the timestamp from /sys/class/infiniband/mlx4_0/hca_type > > Main pitfalls with this is if system time is being modified (admin > > or ntp/ptp). In the rare case that we have a hoplug event and time > > is rewinded we can accidentally reach a very hard debugging > > exercise. You are only using it for direct equality comparision, so someone would have to roll back the clock and hotplug the driver at the exact same nano-second resolution timestamp. That is deeply unlikely to ever happen by accident. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
