On Wed, Jan 21, 2015 at 04:23:33PM +1100, Herbert Xu wrote: > On Mon, Jan 19, 2015 at 01:01:21AM -0800, Paul E. McKenney wrote: > > > > One unconventional way of handling this is to associate the scan with > > a one-to-one resize operation. This can be implemented to have the > > effect of taking a snapshot of the table. > > The problem is that in general (not for netfilter, but certainly > other rhashtable users such as netlink) dumps/walks can be started > by ordinary users and I don't think we can afford creating a > snapshot for each one, or can we? Well, you -could- batch them up, so that a single snapshot covered several users, and once that set was done and memory reclaimed, a second snapshot could cover any additional users that requested dumps/walks in the meantime. Or are users allowed to walk arbitrarily slowly through the table? Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
