On Tue, 22 May 2012, Steven Rostedt wrote: > On Tue, 2012-05-22 at 18:40 +0200, Thomas Gleixner wrote: > > > > I'm all for benchmarks. But right now, making all readers pass through a > > > single mutex is a huge bottle neck for a lot of loads. Yes, they are > > > mostly Java loads, but for some strange reason, our customers seems to > > > like to run Java on our RT kernel :-p > > > > I'm well aware that mmap_sem is a PITA but replacing one nightmare > > with the next one is not the best approach. > > Perhaps we could just change the mmap_sem to use this approach. Create a > new type of rwsem/lock for -rt that we can be picky about. > > Yeah, mmap_sem is a real PITA and it would be nice to have a solution > that can be used until we can convert it to an RCU lock. That still wants to be verified with numbers on a machine with at least 32 cores and workloads which are mmap heavy. And before we don't have such numbers we can really stop arguing about that solution. Thanks, tglx -- 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
