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-rw-r--r--mm/Kconfig30
1 files changed, 30 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 7e28ecfa8aa4..8028dcc6615c 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -478,6 +478,36 @@ config FRONTSWAP
If unsure, say Y to enable frontswap.
+config ZBUD
+ tristate
+ default n
+ help
+ A special purpose allocator for storing compressed pages.
+ It is designed to store up to two compressed pages per physical
+ 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.
+
config MEM_SOFT_DIRTY
bool "Track memory changes"
depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY