Re: [PATCH 0/5] futex: Wakeup optimizations

2013-11-22 Thread Davidlohr Bueso
Hi Darren, On Fri, 2013-11-22 at 21:55 -0800, Darren Hart wrote: > On Fri, 2013-11-22 at 16:56 -0800, Davidlohr Bueso wrote: > > We have been dealing with a customer database workload on large > > 12Tb, 240 core 16 socket NUMA system that exhibits high amounts > > of contention on some of the loc

Re: [PATCH 0/5] futex: Wakeup optimizations

2013-11-22 Thread Mike Galbraith
On Fri, 2013-11-22 at 21:55 -0800, Darren Hart wrote: > On Fri, 2013-11-22 at 16:56 -0800, Davidlohr Bueso wrote: > > This patchset has also been tested on smaller systems for a variety of > > benchmarks, including java workloads, kernel builds and custom > > bang-the-hell-out-of > > hb locks pr

Re: [PATCH 0/5] futex: Wakeup optimizations

2013-11-22 Thread Darren Hart
On Fri, 2013-11-22 at 16:56 -0800, Davidlohr Bueso wrote: > We have been dealing with a customer database workload on large > 12Tb, 240 core 16 socket NUMA system that exhibits high amounts > of contention on some of the locks that serialize internal futex > data structures. This workload special

[PATCH 0/5] futex: Wakeup optimizations

2013-11-22 Thread Davidlohr Bueso
We have been dealing with a customer database workload on large 12Tb, 240 core 16 socket NUMA system that exhibits high amounts of contention on some of the locks that serialize internal futex data structures. This workload specially suffers in the wakeup paths, where waiting on the correspondin