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Keir Fraser authored
Add "page deduplication" capability (with optional compression and trailing-zero elimination) to Xen's tmem. (Transparent to tmem-enabled guests.) Ephemeral pages that have the exact same content are "combined" so that only one page frame is needed. Since ephemeral pages are essentially read-only, no C-O-W (and thus no equivalent of swapping) is necessary. Deduplication can be combined with compression or "trailing zero elimination" for even more space savings. Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
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