On Thu, 2017-08-17 at 14:03 +0100, Tim Deegan wrote:
> At 18:45 +0200 on 16 Aug (1502909149), Dario Faggioli wrote:
> > +
> > +/*
> > + * The CPU is becoming idle, so no more read side critical
> > + * sections, and one more step toward grace period.
> > + */
> > +void rcu_idle_enter(unsigned int
Hi,
This looks good to me. I have one question:
At 18:45 +0200 on 16 Aug (1502909149), Dario Faggioli wrote:
> @@ -474,7 +484,41 @@ static struct notifier_block cpu_nfb = {
> void __init rcu_init(void)
> {
> void *cpu = (void *)(long)smp_processor_id();
> +
> +
Xen is a tickless (micro-)kernel, i.e., when a CPU becomes
idle there is no timer tick that will periodically wake the
CPU up.
OTOH, when we imported RCU from Linux, Linux was (on x86) a
ticking kernel, i.e., there was a periodic timer tick always
running, even on idle CPUs. This was bad for power
