> > do {
> > oldpte = *pte;
> > @@ -94,6 +100,13 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
> > /* Avoid TLB flush if possible */
> > if (pte_protnone(oldpte))
> > continue;
> > +
> > + /*
> > + * Don't mess with PTEs if page is already on the node
> > + * a single-threaded process is running on.
> > + */
> > + if (target_node == page_to_nid(page))
> > + continue;
> > }
> >
>
> Check target_node != NUMA_NODE && target_node == page_to_nid(page) to
> avoid unnecessary page->flag masking and shifts?
I didn't do this last change because I expect a potentially mispredicted
check is more expensive than some shifting/masking.
-Andi
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