Re: [RFC PATCH] mm/migration: Remove anon vma locking from try_to_unmap()use

[Rik van Riel]

On 12/01/2012 01:38 PM, Linus Torvalds wrote:
> On Sat, Dec 1, 2012 at 4:26 AM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> > 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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