[LINUX] [$] Large folios, swap, and FS-Cache

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David Howells wanted to discuss swap handling in light of multi-page folios in a combined storage, filesystem, and memory-management session at the 2024 Linux Storage, Filesystem, Memory Management, and BPF Summit. Swapping has always been done with a one-to-one mapping of memory pages to swap slots, he said, but swapping multi-page folios breaks that assumption. He wondered if it would make sense to use filesystem techniques to track swapped-out folios.

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