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SubjectRe: REGRESSION: Performance regressions from switching anon_vma->lock to mutex
On Wed, 2011-06-15 at 14:12 -0700, Tim Chen wrote:
> Thanks to Andi for providing the info. We've used this workaround in
> our testing so it will not mask true kernel scaling bottlenecks.

tip+sirq+linus is still slightly faster than .39 here, although removing
that sysconf() wreckage closed the gap considerably (needing to know the
number of cpus to optimize locking sounds like a trainwreck all of its
own, needing it _that_ often instead of just once at startup is even

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