Looks like the NoNewRefs flag is mostly ==
spin_is_locked(mapping->tree_lock)? Would it not be better to check the
tree_lock?
> --- linux-2.6.orig/mm/migrate.c
> +++ linux-2.6/mm/migrate.c
>
> + SetPageNoNewRefs(page);
> write_lock_irq(&mapping->tree_lock);
A dream come true! If this is really working as it sounds then we can
move the SetPageNoNewRefs up and avoid the final check under
mapping->tree_lock. Then keep SetPageNoNewRefs until the page has been
copied. It would basically play the same role as locking the page.
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