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CONFIG_ZCACHE_WRITEBACK: Allow compressed swap pages to be writtenback to swap disk

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The Linux kernel configuration item CONFIG_ZCACHE_WRITEBACK:

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Zcache caches compressed swap pages (and other data) in RAM which often improves performance by avoiding I/O's due to swapping. In some workloads with very long-lived large processes, it can instead reduce performance. Writeback decompresses zcache-compressed pages (in LRU order) when under memory pressure and writes them to the backing swap disk to ameliorate this problem. Policy driving writeback is still under development.



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