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by loeg
1141 days ago
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I suspect page size/aligned file holes could be backed by a read-only zero page via PTE as an optimization, but they might not be (I'm not as familiar with Linux mmap/filesystems as with FreeBSD). It is quite possible the filesystem caches, e.g., the file extent tree (including holiness) separately from the backing inode/on-disk sectors for the tree. |
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