On Mon, 5 Apr 1999 13:57:45 +0100 (BST), Mark Hemment <markhe@sco.COM>
said:
> I agree there maybe other processes around which refer to the disk copy,
> but isn't there a need to decrement the reference count for this disk
> copy on a COW? ie. do a swap_free() when the page ref count is greater
> than 2 - not to free the disk-copy, but to keep the swap_map counter
> correct.
Not in do_wp_page(): that is only used for physically present pages, so
the pte we are touching doesn't count as a swap entry in the first
place. A write fault to a swap-entry pte will go from
handle_pte_fault() via do_swap_page() into swap_in(), and there we _do_
perform a swap_free where necessary.
--Stephen
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