table of contents
other versions
PAGE_CACHE_ASYNC_REA(9) | Memory Management in Linux | PAGE_CACHE_ASYNC_REA(9) |
NAME¶
page_cache_async_readahead - file readahead for marked pagesSYNOPSIS¶
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¶
struct address_space * mappingaddress_space which holds the pagecache and I/O
vectors
struct file_ra_state * ra
file_ra_state which holds the readahead state
struct file * filp
passed on to ->readpage and
->readpages
struct page * page
the page at offset which has the PG_readahead flag
set
pgoff_t offset
start offset into mapping, in pagecache page-sized
units
unsigned long 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¶
July 2017 | Kernel Hackers Manual 4.11 |