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Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 3367ac37fc4..01cd56e7594 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -487,3 +487,23 @@ config ZBUD page. While this design limits storage density, it has simple and deterministic reclaim properties that make it preferable to a higher density approach when reclaim will be used. + +config ZSWAP + bool "Compressed cache for swap pages (EXPERIMENTAL)" + depends on FRONTSWAP && CRYPTO=y + select CRYPTO_LZO + select ZBUD + default n + help + A lightweight compressed cache for swap pages. It takes + pages that are in the process of being swapped out and attempts to + compress them into a dynamically allocated RAM-based memory pool. + This can result in a significant I/O reduction on swap device and, + in the case where decompressing from RAM is faster that swap device + reads, can also improve workload performance. + + This is marked experimental because it is a new feature (as of + v3.11) that interacts heavily with memory reclaim. While these + interactions don't cause any known issues on simple memory setups, + they have not be fully explored on the large set of potential + configurations and workloads that exist. |