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. July 2010 PAGE_CACHE_ASYNC_REA(9)
