Hi,
as discussed before:
If a high-scalability locking scheme is built with multiple
spinlocks, then often additional memory barriers are required.
The documentation was not as clear as possible, and memory
barriers were missing / superfluous in the implementation.
Patch 1: Documentation, define one standard barrier, update ipc/sem.c
Patch 2: Update rcutree
Patch 3: Update nf_conntrack
Patch 4: Update for qspinlock: smp_mb__after_spin_lock is free.
Patch 3 is larger than required, it rewrites the conntrack logic
with the code from ipc/sem.c. I think the new code is simpler
and more realtime-friendly.
Please review!
@Andrew: The patches are relative to mmots.
Could you include them in your tree, with the target of including in
linux-next?
--
Manfred
