On 12/01/2012 01:38 PM, Linus Torvalds wrote:

On Sat, Dec 1, 2012 at 4:26 AM, Ingo Molnar [off-list ref] wrote:

quoted

So as a quick concept hack I wrote the patch attached below.
(It's not signed off, see the patch description text for the
reason.)

Well, it confirms that anon_vma locking is a big problem, but as
outlined in my other email it's completely incorrect from an actual
behavior standpoint.

Btw, I think the anon_vma lock could be made a spinlock

The anon_vma lock used to be a spinlock, and was turned into a
mutex by Peter, as part of an effort to make more of the VM
preemptible.

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