Re: [patch 1/3] mmu_notifier: Core code

[Robin Holt]

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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