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    SubjectRe: [PATCH 01 of 12] Core of mmu notifiers
    On Sun, 27 Apr 2008, Andrea Arcangeli wrote:

    > Talking about post 2.6.26: the refcount with rcu in the anon-vma
    > conversion seems unnecessary and may explain part of the AIM slowdown
    > too. The rest looks ok and probably we should switch the code to a
    > compile-time decision between rwlock and rwsem (so obsoleting the
    > current spinlock).

    You are going to take a semphore in an rcu section? Guess you did not
    activate all debugging options while testing? I was not aware that you can
    take a sleeping lock from a non preemptible context.

     \ /
      Last update: 2008-04-28 22:37    [W:0.062 / U:3.224 seconds]
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