> We _could_ walk the pte chain in writeback. But that would involve
> visiting every page in the mapping, basically. That could hurt.
>
> But if a page is already dirty, and we're going to write it anyway,
> it makes tons of sense to run around and clean all the ptes which
> point at it.
Walking ptes probably doesn't hurt as much as doing extra
disk IO, so I guess you're right ;)
Rik
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