Messages in this thread | | | Date | Wed, 2 Jul 2014 10:55:01 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH RFC tip/core/rcu] Parallelize and economize NOCB kthread wakeups |
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On Wed, Jul 02, 2014 at 07:26:00PM +0200, Peter Zijlstra wrote: > On Wed, Jul 02, 2014 at 10:08:38AM -0700, Paul E. McKenney wrote: > > As were others, not that long ago. Today is the first hint that I got > > that you feel otherwise. But it does look like the softirq approach to > > callback processing needs to stick around for awhile longer. Nice to > > hear that softirq is now "sane and normal" again, I guess. ;-) > > Nah, softirqs are still totally annoying :-)
Name me one thing that isn't annoying. ;-)
> So I've lost detail again, but it seems to me that on all CPUs that are > actually getting ticks, waking tasks to process the RCU state is > entirely over doing it. Might as well keep processing their RCU state > from the tick as was previously done.
And that is in fact the approach taken by my patch. For which I just kicked off testing, so expect an update later today. (And that -is- optimistic! A pessimistic viewpoint would hold that the patch would turn out to be so broken that it would take -weeks- to get a fix!)
Thanx, Paul
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