Hi Rik,

Here is my first proposal for changing shm to be integrated into
shrink_mmap.

It gives you a function 'int shm_write_swap (struct page *page)' to
write out a page to swap and replace the pte in the shm structures.  I
tested the stuff with no swapping and it seems stable so far. But
shm_write_swap is completely untested.

It probably needs to add the pages in shm_nopage_core to your lru
queues and of course it needs the calls from shrink_mmap.

I think it would be nicer to only have a notify function instead of
shm_write_swap, which gets the page and the swap_entry and can simply
put the swap_entry into the shm structures without handling the
swapping at all.

What do you think?
        		Christoph