On 9/27/07, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > -- > On Thu, 27 Sep 2007, Dmitry Torokhov wrote: > > > > > > Here are the uses in 2.6.23-rc6. There are several that might not > > > be so easy to replace with RCU. > > > > > > > I will look into converting into "proper RCU" but I'd like you to > > consider one more thing - proper RCU disables preemption, correct? So > > it seems that converting code to "proper RCU" to some degree negates > > the benefits of sleeping spinlocks introduced in -rt. If there was a > > way to create synchronize_irq_spinlocks() that is separate from RCU > > and could be preempted that would give the best of the 2 worlds. > > > > Not at all. In -rt, we then use preemptible RCU. So read_rcu_lock does not > disable preemption in the -rt kernel (and hopefully soon in mainline as > well - configured not to that is). > Ah, OK then. -- Dmitry - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
