On 05/01/2012 06:36 PM, Peter Zijlstra wrote: > On Tue, 2012-05-01 at 18:31 +0300, Avi Kivity wrote: > > On 05/01/2012 05:59 PM, Peter Zijlstra wrote: > > > On Tue, 2012-05-01 at 15:12 +0300, Avi Kivity wrote: > > > > local_irq_save() is a stronger version or rcu_read_lock() > > > > > > Not so, local_irq_save() doesn't at all stop regular RCU grace periods, > > > things like preemptible rcu can be driven from rcu_read_unlock(). > > > > > > Note that this is the reason call_rcu_sched() exists and is used in this > > > case. > > > > Ah, thanks for the correction. I'll read some more about the _sched > > variants. > > Basically: > > rcu_read_{,un}lock_sched() -- aka preempt_{en,dis}able() > call_rcu_sched() > synchronize_rcu_sched() -- aka synchronize_sched(); > > Define an RCU variant where each cpu has to have scheduled at least once > to complete a grace period. Which was the original rcu implementation, until it got replaced by preemptible rcu, yes? I guess that was the source of my confusion. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html