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 4.8.                 January 2017                   PAGE_CACHE_ASYNC_REA(9)