On Fri, Jun 17, 2011 at 11:32 AM, Peter Zijlstra <peterz@infradead.org> wrote:
>
> something like so I guess, completely untested etc..

Having gone over it a bit more, I actually think I prefer to just
special-case the allocation instead.

We already have to drop the anon_vma lock for the "out of memory"
case, and a slight re-organization of clone_anon_vma() makes it easy
to just first try a NOIO allocation with the lock still held, and then
if that fails do the "drop lock, retry, and hard-fail" case.

IOW, something like the attached (on top of the patches already posted
except for your memory reclaim thing)

Hugh, does this fix the lockdep issue?

                        Linus