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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

February 2017 Kernel Hackers Manual 3.16