PageReadahead

函数名称：PageReadahead

函数原型：static inline __attribute__((__always_inline__)) int PageReadahead(struct page *page)

返回类型：int

参数：

类型	参数	名称
struct page *	page

**调用者**
名称	描述
generic_file_buffered_read	generic_file_buffered_read - generic file read routine@iocb: the iocb to read@iter: data destination@written: already copied This is a generic file read routine, and uses the* mapping->a_ops->readpage() function for the actual low-level stuff.
do_async_mmap_readahead	Asynchronous readahead happens when we find the page and PG_readahead,* so we want to possibly extend the readahead further. We return the file that* was pinned if we have to drop the mmap_sem in order to do IO.
filemap_map_pages

函数逻辑报告