[PATCH v12 21/31] mm: Introduce find_vma_rcu()

[Davidlohr Bueso]

On Tue, 23 Apr 2019, Peter Zijlstra wrote:

>Also; the initial motivation was prefaulting large VMAs and the
>contention on mmap was killing things; but similarly, the contention on
>the refcount (I did try that) killed things just the same.

Right, this is just like what can happen with per-vma locking.

Thanks,
Davidlohr