Re: [bisected] pre-3.16 regression on open() scalability

[Christoph Lameter]

This looks very much like the CONFIG_PREEMPT problem in not so
extreme form. Maybe we need to add another config option:

CONFIG_REALLY_REALLY_NO_PREEMPT

to get the fastest code possible and those cond_rescheds removed from the
critical paths?

Or better

CONFIG_PREEMPT_HALF_WAY

to enable those cond_rescheds.

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