Initial file dump from open source releaseHEADmaster

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/staging/zcache/Kconfig b/drivers/staging/zcache/Kconfig
new file mode 100644
index 00000000..2d7b2da3
--- /dev/null
+++ b/drivers/staging/zcache/Kconfig
@@ -0,0 +1,59 @@
+config ZCACHE
+	tristate "Dynamic compression of swap pages and clean pagecache pages"
+	depends on CRYPTO=y && SWAP=y && CLEANCACHE && FRONTSWAP
+	select CRYPTO_LZO
+	default n
+	help
+	  Zcache doubles RAM efficiency while providing a significant
+	  performance boosts on many workloads.  Zcache uses
+	  compression and an in-kernel implementation of transcendent
+	  memory to store clean page cache pages and swap in RAM,
+	  providing a noticeable reduction in disk I/O.
+
+config ZCACHE_DEBUG
+	bool "Enable debug statistics"
+	depends on DEBUG_FS && ZCACHE
+	default n
+	help
+	  This is used to provide an debugfs directory with counters of
+	  how zcache is doing. You probably want to set this to 'N'.
+
+config RAMSTER
+	tristate "Cross-machine RAM capacity sharing, aka peer-to-peer tmem"
+	depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE
+	depends on NET
+	# must ensure struct page is 8-byte aligned
+	select HAVE_ALIGNED_STRUCT_PAGE if !64BIT
+	default n
+	help
+	  RAMster allows RAM on other machines in a cluster to be utilized
+	  dynamically and symmetrically instead of swapping to a local swap
+	  disk, thus improving performance on memory-constrained workloads
+	  while minimizing total RAM across the cluster.  RAMster, like
+	  zcache2, compresses swap pages into local RAM, but then remotifies
+	  the compressed pages to another node in the RAMster cluster.
+
+config RAMSTER_DEBUG
+        bool "Enable ramster debug statistics"
+        depends on DEBUG_FS && RAMSTER
+        default n
+        help
+          This is used to provide an debugfs directory with counters of
+          how ramster is doing. You probably want to set this to 'N'.
+
+# Depends on not-yet-upstreamed mm patches to export end_swap_bio_write and
+# __add_to_swap_cache, and implement __swap_writepage (which is swap_writepage
+# without the frontswap call. When these are in-tree, the dependency on
+# BROKEN can be removed
+config ZCACHE_WRITEBACK
+	bool "Allow compressed swap pages to be writtenback to swap disk"
+	depends on ZCACHE=y && BROKEN
+	default n
+	help
+	  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.