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

From: Ingo Molnar (mingo@elte.hu)
Date: Fri Sep 27 2002 - 12:42:33 EST

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

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