On Tue, Feb 5, 2013 at 2:07 PM, Li Haifeng <omycle@gmail.com> wrote:
Hi, all in kernel.
The page->_count is the page frame's usage count. When page is allocated, the page->_cout will be set 1.
After be allocated from buddy system, the page will be used by process. get_page and put_page/put_page_testzero will used in pairs. is it right?
When the page is reclaimed to buddy system, the page->_count should be 0. However, Because the initialization of page->_count is 1, get_page() and put_page() is called in pairs, I coufused how page->_count will be 0?
Not sure but I suspect that the page->_count will be 0 whenever the file is deleted.
Thanks.
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies