Hello, Michal. On Mon, Jun 10, 2013 at 10:02:08AM +0200, Michal Hocko wrote: > Sure a next visit on the same root subtree (same node, zone and prio) > would css_put it but what if that root goes away itself. Still fixable, > if every group checks its own cached iters and css_put everybody but > that is even uglier. So doing the up-the-hierarchy cleanup in RCU > callback is much easier. Ooh, right, we don't need cleanup of the cached cursors on destruction if we get this correct - especially if we make cursors point to the next cgroup to visit as self is always the first one to visit. Yeah, if we can do away with that, doing that way is definitely better. Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>