William Lee Irwin III [off-list ref] wrote:

 On Sun, Aug 29, 2004 at 01:59:17PM -0700, Andrew Morton wrote:
 > The changlog wasn't that detailed ;)
 > But yes, it's the large nr_requests which is tripping up swapout.  I'm
 > assuming that when a process exits with its anonymous memory still under
 > swap I/O we're forgetting to actually free the pages when the I/O
 > completes.  So we end up with a ton of zero-ref swapcache pages on the LRU.
 > I assume.   Something odd's happening, that's for sure.

 Maybe we need to be checking for this in end_swap_bio_write() or
 rotate_reclaimable_page()?

Maybe.  I thought a get_page() in swap_writepage() and a put_page() in
end_swap_bio_write() would cause the page to be freed.  But not.  It needs
some actual real work done on it.
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