page_cache_sync_readahead (9) - Linux Manuals

page_cache_sync_readahead: generic file readahead

Command to display page_cache_sync_readahead manual in Linux: $ man 9 page_cache_sync_readahead

NAME

page_cache_sync_readahead - generic file readahead

SYNOPSIS

void page_cache_sync_readahead(struct address_space * mapping, struct file_ra_state * ra, struct file * filp, pgoff_t offset, unsigned long req_size);

ARGUMENTS

mapping

: address_space which holds the pagecache and I/O vectors

: file_ra_state which holds the readahead state

filp

: passed on to ->readpage and ->readpages

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_sync_readahead should be called when a cache miss happened: it will submit the read. The readahead logic may decide to piggyback more pages onto the read request if access patterns suggest it will improve performance.