On Wed, 13 Aug 2003, Mel Gorman wrote:

Freed in try_to_swap_out() . There is no need to do anything with a clean
page, so it is just dropped from the page tables and page_cache_release()
is called. When the reference reaches 0, the page is reclaimed

Bah, this is wrong, shouldn't be let near e-mail in the morning. The
freeing of a file-mapped page is actually two-stage.

try_to_swap_out() will unmap the file-backed page from a process page
table. Once there are no processes mapping the page, the only user in
page->count will be the page cache. It stays in the page cache until it is
reclaimed later by shrink_cache().

-- 
Mel Gorman
http://www.csn.ul.ie/~mel
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