get_kpfn

函数名称：This helper is used for getting right index into array of tree roots.* When merge_across_nodes knob is set to 1, there are only two rb-trees for* stable and unstable pages from all nodes with roots in index 0. Otherwise,

函数原型：static inline int get_kpfn_nid(unsigned long kpfn)

返回类型：int

参数：

类型	参数	名称
unsigned long	kpfn

**调用者**
名称	描述
stable_tree_search	stable_tree_search - search for page inside the stable tree* This function checks if there is a page inside the stable tree* with identical content to the page that we are scanning right now
stable_tree_insert	stable_tree_insert - insert stable tree node pointing to new ksm page* into the stable tree.* This function returns the stable tree node just allocated on success,* NULL otherwise.
unstable_tree_search_insert	stable_tree_search_insert - search for identical page,* else insert rmap_item into the unstable tree.* This function searches for a page in the unstable tree identical to the* page currently being scanned; and if no identical page is found in the
cmp_and_merge_page	mp_and_merge_page - first see if page can be merged into the stable tree;* if not, compare checksum to previous and if it's the same, see if page can* be inserted into the unstable tree, or merged with a page already there and

函数逻辑报告