[PATCH -tip 0/4] rtmutex: Spin on owner

[Davidlohr Bueso]

Hello,

First three patches are straightforward and found while
going through the code. Patch 4 is the actual meat of the
set, but similar to what we have already in regular mutexes.
While having optimistic spinning in rtmutexes is a desired
feature, I've marked it RFC as I could very well have missed
something inherint in the rt flavor.

Details in the individual patches. Passes pi tests from
Darren's futextest suite as well as all weekend running
pi_stress from rt-tests on a 60 core box.

Thanks!

Davidlohr Bueso (4):
  locking/rtmutex: Implement lockless top-waiter wakeup
  locking/rtmutex: Use cmp-cmpxchg
  locking/rtmutex: Update stale plist comments
  locking/rtmutex: Support spin on owner (osq)

 include/linux/rtmutex.h  |   4 ++
 kernel/Kconfig.locks     |   4 ++
 kernel/locking/rtmutex.c | 175 +++++++++++++++++++++++++++++++++++++++++------
 3 files changed, 162 insertions(+), 21 deletions(-)

-- 
2.1.4

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