Re: [patch 00/18] CFS Bandwidth Control v7.2

Paul E. McKenney
2011-07-25T16:21:55Z

On Mon, Jul 25, 2011 at 05:00:41PM +0200, Peter Zijlstra wrote:
> On Mon, 2011-07-25 at 16:58 +0200, Peter Zijlstra wrote:
> > + rcu_read_lock();
> > + ret = walk_tg_tree_from(tg, tg_set_cfs_period_down, NULL, &period);
> > + rcu_read_unlock();
>
> rcu over a mutex doesn't really work in mainline, bah..

SRCU can handle that situation, FWIW. But yes, blocking in an RCU
read-side critical section is a no-no.

Thanx, Paul