Re: [RFC PATCH RT V3] rwsem: The return of multi-reader PI rwsems

2014-04-11 Thread Carsten Emde
Hi Steven, [..] I added Carsten to the Cc, so I'll post the entire change log of v1 here again. I've been listening and testing boxes all the time ... [..] If you have any benchmark on large machines I would be very happy if you could test this patch against the unpatched version of -rt. Thr

Re: [RFC PATCH RT V3] rwsem: The return of multi-reader PI rwsems

2014-04-11 Thread Steven Rostedt
On Fri, 11 Apr 2014 14:47:49 +0200 Carsten Emde wrote: > Hi Steven, > > > [..] I added Carsten to the Cc, so I'll post the entire change log > > of v1 here again. > I've been listening and testing boxes all the time ... > I figured but still wanted to add you to the Cc. > > [..] If you have a

[RFC PATCH RT V3] rwsem: The return of multi-reader PI rwsems

2014-04-10 Thread Steven Rostedt
Changes since v2 - move the setting of the rt_rw_limit to late_initcall, and use 2 x nr_cpu_ids. Thanks to Paul McKenney for suggesting using nr_cpu_ids instead of num_possible_cpus(). The 2x is because out testing shows that 2x gives twice the performance as 1x using Clark's whack_mmap_sem benchma