int FASTCALL (try_to_unmap_one(struct page *, pte_addr_t) );
Internal helper function for try_to_unmap, called for each page table entry mapping a page. Because locking order here is opposite to the locking order used by the page fault path, we use trylocks.
page lock shrink_list, trylock pte_chain_lock shrink_list mm->page_table_lock try_to_unmap_one, trylock