TRUNCATE_INODE_PAGES - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Memory Management in Linux

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NAMEtruncate_inode_pages_range − truncate range of pages specified by start & end byte offsets

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SYNOPSISvoid truncate_inode_pages_range(struct address_space * mapping, loff_t lstart, loff_t lend);

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ARGUMENTSmapping mapping to truncate lstart offset from which to truncate lend offset to which to truncate

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DESCRIPTIONTruncate the page cache, removing the pages that are between specified offsets (and zeroing out partial page (if lstart is not page aligned))​. Truncate takes two passes − the first pass is nonblocking​. It will not block on page locks and it will not block on writeback​. The second pass will wait​. This is to prevent as much IO as possible in the affected region​. The first pass will remove most pages, so the search cost of the second pass is low​. We pass down the cache−hot hint to the page freeing code​. Even if the mapping is large, it is probably the case that the final pages are the most recently touched, and freeing happens in ascending file offset order​.

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