On Sat, 19 May 2007 11:15:01 -0700 William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:But do anybody ever need to do that?
Much the same holds for the atomic_t's; 32 + PAGE_SHIFT is
44 bits or more, about as much as is possible, and one reference per
page per page is not even feasible. Full-length atomic_t's are just
not necessary.
You can overflow a page's refcount by mapping it 4G times. That requires
32GB of pagetable memory. It's quite feasible with remap_file_pages().