Previously, during swapout, all PMD page mapping will be split and
replaced with PTE swap mapping. And when clearing the SWAP_HAS_CACHE
flag for the huge swap cluster in put_swap_page(), the huge swap
cluster will be split. Now, during swapout, the PMD page mappings to
the THP will be changed to
Previously, during swapout, all PMD page mapping will be split and
replaced with PTE swap mapping. And when clearing the SWAP_HAS_CACHE
flag for the huge swap cluster in put_swap_page(), the huge swap
cluster will be split. Now, during swapout, the PMD page mappings to
the THP will be changed to
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