Re: [PATCH] mm: incorporate read-only pages into transparent huge pages

[Vlastimil Babka]

On 23.1.2015 20:18, Andrea Arcangeli wrote:
> > >+		if (!pte_write(pteval)) {
> > >+			if (++ro > khugepaged_max_ptes_none)
> > >+				goto out_unmap;
> > >+		}
> It's true this is maxed out at 511, so there must be at least one
> writable and not none pte (as results of the two "ro" and "none"
> counters checks).

Hm, but if we consider ro and pte_none separately, both can be lower
than 512, but the sum of the two can be 512, so we can actually be in
read-only VMA?
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