1PAGE_CACHE_SYNC_READ(9)   Memory Management in Linux   PAGE_CACHE_SYNC_READ(9)
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NAME

6       page_cache_sync_readahead - generic file readahead
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SYNOPSIS

9       void page_cache_sync_readahead(struct address_space * mapping,
10                                      struct file_ra_state * ra,
11                                      struct file * filp, pgoff_t offset,
12                                      unsigned long req_size);
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ARGUMENTS

15       mapping
16           address_space which holds the pagecache and I/O vectors
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18       ra
19           file_ra_state which holds the readahead state
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21       filp
22           passed on to ->readpage and ->readpages
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24       offset
25           start offset into mapping, in pagecache page-sized units
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27       req_size
28           hint: total size of the read which the caller is performing in
29           pagecache pages
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DESCRIPTION

32       page_cache_sync_readahead should be called when a cache miss happened:
33       it will submit the read. The readahead logic may decide to piggyback
34       more pages onto the read request if access patterns suggest it will
35       improve performance.
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38Kernel Hackers Manual 2.6.         June 2019           PAGE_CACHE_SYNC_READ(9)
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