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    SubjectRe: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones
    On Wed, Jul 01, 2015 at 12:12:21PM +0200, Peter Zijlstra wrote:
    > 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.

    OK, I'll bite. Exactly what seems especially vile about it?

    Thanx, Paul



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