centos man page for page_cache_sync_readahead

PAGE_CACHE_SYNC_READ(9) 				    Memory Management in Linux					   PAGE_CACHE_SYNC_READ(9)

NAME
       page_cache_sync_readahead - generic file readahead

SYNOPSIS
       void page_cache_sync_readahead(struct address_space * mapping, struct file_ra_state * ra, struct file * filp, 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

       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_sync_readahead should be called when a cache miss happened: it will submit the read. The readahead logic may decide to piggyback
       more pages onto the read request if access patterns suggest it will improve performance.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   PAGE_CACHE_SYNC_READ(9)