[RFC][PATCH 0/5] Optimize percpu-rwsem

[Peter Zijlstra]

Hi all,

This is a derived work of the cpu hotplug lock rework I did in 2013 which never
really went anywhere because Linus didn't like it.

This applies those same optimizations to the percpu-rwsem. Seeing how we did
all the work it seemed a waste to not use it at all.



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