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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

struct address_space * mapping

address_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

June 2017 Kernel Hackers Manual 4.11