On Wed, 13 Nov 2013 17:07:18 +0100 (CET)
Thomas Gleixner <t...@linutronix.de> wrote:
> Right. It's telling you if NOHZ is enabled. It's not telling you that
> NOHZ is active.
Yeah, which makes this code rather silly:
in rcu_prepare_for_idle():
/* Handle nohz enablement switches conservatively. */
tne = ACCESS_ONCE(tick_nohz_enabled);
if (tne != rdtp->tick_nohz_enabled_snap) {
if (rcu_cpu_has_callbacks(cpu, NULL))
invoke_rcu_core(); /* force nohz to see update. */
rdtp->tick_nohz_enabled_snap = tne;
return;
}
-- Steve
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