Re: [patch] 'virtual => physical page mapping cache', vcache-2.5.38-B8

[Ingo Molnar]

i'd love to do this, but:

> 	spin_lock(&futex_lock);
> 
> >         q.page = NULL;
> >         attach_vcache(&q.vcache, uaddr, current->mm, futex_vcache_callback);
> > 
> >         page = pin_page(uaddr - offset);

            [ LOCKUP ]

pin_page() calls get_user_pages(), which might block in handle_mm_fault().

	Ingo