> There does seem to be a dangling thread here though - when a process
> page is unmapped and added to swap cache in try_to_swap_out then later
> faulted back in, I don't see where we "rescue" the page from the
> inactive queue. Maybe I'm just not looking hard enough.
do_swap_page()->lookup_swap_cache()->__find_page_nolock()->SetPageReferenced().
The referenced bit will make page_launder/reclaim_page move the page to
the active list.
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