From: Patrick McHardy <kaber@xxxxxxxxx> Date: Thu, 16 Apr 2009 15:11:31 +0200 > Linus Torvalds wrote: >> On Wed, 15 Apr 2009, Stephen Hemminger wrote: >>> The counters are the bigger problem, otherwise we could just free >>> table >>> info via rcu. Do we really have to support: replace where the counter >>> values coming out to user space are always exactly accurate, or is it >>> allowed to replace a rule and maybe lose some counter ticks (worst >>> case >>> NCPU-1). >> Why not just read the counters fromt he old one at RCU free time (they >> are guaranteed to be stable at that point, since we're all done with >> those entries), and apply them at that point to the current setup? > > We need the counters immediately to copy them to userspace, so waiting > for an asynchronous RCU free is not going to work. It just occurred to me that since all netfilter packet handling goes through one place, we could have a sort-of "netfilter RCU" of sorts to solve this problem. -- 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
