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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_ondemand 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 2.6.	 November 2013	       PAGE_CACHE_ASYNC_REA(9)

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