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mm: zswap: remove same_filled module params
These knobs offer more fine-grained control to userspace than needed and directly expose/influence kernel implementation; remove them. For disabling same_filled handling, there is no logical reason to refuse storing same-filled pages more efficiently and opt for compression. Scanning pages for patterns may be an argument, but the page contents will be read into the CPU cache anyway during compression. Also, removing the same_filled handling code does not move the needle significantly in terms of performance anyway [1]. For disabling non_same_filled handling, it was added when the compressed pages in zswap were not being properly charged to memcgs, as workloads could escape the accounting with compression [2]. This is no longer the case after commit f4840cc ("zswap: memcg accounting"), and using zswap without compression does not make much sense. [1]https://lore.kernel.org/lkml/CAJD7tkaySFP2hBQw4pnZHJJwe3bMdjJ1t9VC2VJd=khn1_TXvA@mail.gmail.com/ [2]https://lore.kernel.org/lkml/[email protected]/ [[email protected]: remove same_filled_pages from docs] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Yosry Ahmed <[email protected]> Acked-by: Johannes Weiner <[email protected]> Reviewed-by: Nhat Pham <[email protected]> Reviewed-by: Chengming Zhou <[email protected]> Cc: "Maciej S. Szmigiero" <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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