Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones

[Peter Zijlstra]

On Tue, Jun 30, 2015 at 08:37:01PM -0700, Paul E. McKenney wrote:
> > Wait, what?  Why is anything using traditional (non-S) RCU while *any*
> > lock is held?
> 
> In their defense, it is a sleeplock that is never taken except when
> rearranging networking configuration.  Sometimes they need a grace period
> under the lock.  So synchronize_net() checks to see if RTNL is held, and
> does a synchronize_rcu_expedited() if so and a synchronize_rcu() if not.

Sounds vile.
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