centos man page for page_cache_async_readahead

PAGE_CACHE_ASYNC_REA(9) 				    Memory Management in Linux					   PAGE_CACHE_ASYNC_REA(9)

NAME
       page_cache_async_readahead - file readahead for marked pages

SYNOPSIS
       void page_cache_async_readahead(struct address_space * mapping, struct file_ra_state * ra, struct file * filp, struct page * page,
				       pgoff_t offset, unsigned long req_size);

ARGUMENTS
       mapping
	   address_space which holds the pagecache and I/O vectors

       ra
	   file_ra_state which holds the readahead state

       filp
	   passed on to ->readpage and ->readpages

       page
	   the page at offset which has the PG_readahead flag set

       offset
	   start offset into mapping, in pagecache page-sized units

       req_size
	   hint: total size of the read which the caller is performing in pagecache pages

DESCRIPTION
       page_cache_async_readahead should be called when a page is used which has the PG_readahead flag; this is a marker to suggest that the
       application has used up enough of the readahead window that we should start pulling in more pages.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   PAGE_CACHE_ASYNC_REA(9)