Messages in this thread | | | From | Manfred Spraul <> | Subject | [PATCH 0/4 V4] Clarify/standardize memory barriers for lock/unlock | Date | Mon, 29 Aug 2016 15:34:25 +0200 |
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Hi,
V4: Docu/comment improvements, remove unnecessary barrier for x86. V3: Bugfix for arm64 V2: Include updated documentation for rcutree patch
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
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