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    SubjectRe: [patch 1/3] mmu_notifier: Core code
    On Thu, Jan 31, 2008 at 06:39:19PM -0800, Christoph Lameter wrote:
    > On Thu, 31 Jan 2008, Robin Holt wrote:
    >
    > > Jack has repeatedly pointed out needing an unregister outside the
    > > mmap_sem. I still don't see the benefit to not having the lock in the mm.
    >
    > I never understood why this would be needed. ->release removes the
    > mmu_notifier right now.

    Both xpmem and GRU have means of removing their context seperate from
    process termination. XPMEMs is by closing the fd, I believe GRU is
    the same. In the case of XPMEM, we are able to acquire the mmap_sem.
    For GRU, I don't think it is possible, but I do not remember the exact
    reason.

    Thanks,
    Robin


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