On Sat, Aug 09, 2014 at 08:44:39AM -0400, Steven Rostedt wrote: > On Sat, 9 Aug 2014 08:15:14 +0200 > Peter Zijlstra <pet...@infradead.org> wrote: > > > > As for idle tasks, I'm not sure about those, I think that we should say > > NO to anything that would require waking idle CPUs, push the pain to > > ftrace/kprobes, we should _not_ be waking idle cpus. > > I agree, but I haven't had a chance to review the patch set (will > probably do that on Monday, just got back from vacation last week and > was inundated by other things).
Let me get v5 out first. I expect to have it out by end of Monday. > Does the idle waking happen only when > there's something queued in the call_rcu_tasks()? It should definitely > not be waking all the time. That's just wrong. > > But if it only wakes when something is queued, it wouldn't be burdening > anything, unless it is needed. Indeed, idle waking only happens when there is an RCU-tasks grace period in progress. No RCU-tasks grace period, no RCU-tasks idle waking. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/