On Fri, 2010-04-23 at 13:17 -0700, Greg Thelen wrote:> +static void mem_cgroup_begin_page_cgroup_reassignment(void)> +{> + VM_BUG_ON(mem_cgroup_account_move_ongoing);> + mem_cgroup_account_move_ongoing = true;> + synchronize_rcu();> +} btw, you know synchronize_rcu() is _really_ slow?