On 09/30, Peter Zijlstra wrote: > > On Mon, Sep 30, 2013 at 04:24:00PM +0200, Peter Zijlstra wrote: > > For that we'd have to decrement xxx->gp_count from cb_rcu_func(), > > wouldn't we? > > > > Without that there's no guarantee the fast path readers will have a MB > > to observe the write critical section, unless I'm completely missing > > something obviuos here. > > Duh.. we should be looking at gp_state like Paul said. Yes, yes, that is why we have xxx_is_idle(). Its name is confusing even ignoring "xxx". OK, I'll try to invent the naming (but I'd like to hear suggestions ;) and send the patch. I am going to add "exclusive" and "rcu_domain/ops" later, currently percpu_rw_semaphore needs ->rw_sem anyway. Oleg. -- 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>