On Thu, 2016-04-07 at 18:47 +0200, Sebastian Andrzej Siewior wrote: > On 04/02/2016 05:12 AM, Mike Galbraith wrote: > > > By the time I improved hotplug I played with this. I had a few ideas but > > > it didn't fly in the end. Today however I ended up with this: > > > > Yeah, but that fails the duct tape test too. Mine is below, and is the > > extra sticky variety ;-) With busted 0299 patch reverted and those two > > applied, my DL980 took a beating for ~36 hours before I aborted it.. ie > > hotplug road seemingly has no more -rt specific potholes. > > just to be clear: The patch I attached did _not_ work for you. Sorry, I didn't test. Marathon stress test session convinced me that the lock added by -rt absolutely had to die. > > If that lock dies, we can unpin when entering lock slow path and pin > > again post acquisition with no ABBA worries as well, and not only does > > existing hotplug work heaping truckloads better, -rt can perhaps help > > spot trouble as the rewrite proceeds. > > > > Current state is more broken than ever.. if that's possible. > > And the two patches you attached here did? I've killed way too many NOPREEMPT kernels to make any rash -rt claims. What I can tell you is that my 64 core DL980 running 4.6-rc2-rt13 plus the two posted patches survived for ~20 hours before I had to break it off because I needed the box. These two haven't been through _as_ much pounding as the two targeted bandaids I showed have, but have been through quite a bit. Other folks beating the living crap outta their boxen too would not be a bad idea. -Mike -- 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
