On 04/07/2016 09:04 PM, Mike Galbraith wrote: >> 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.
Okay. And the patch did that. I removed the lock. >>> 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. I see. So what I don't like are all the exceptions you have: one for RCU and one kernfs. There might come more in the future. So what I aim is the removal of the lock. > > -Mike > Sebastian
