PAGE_CACHE_SYNC_READ(9) Memory Management in Linux PAGE_CACHE_SYNC_READ(9)
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
ra
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.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 PAGE_CACHE_SYNC_READ(9)
