X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=mm%2FKconfig;h=82fed4eb2b6fe39cfd0476afe46e9589e02b386f;hb=9800ee6f50a3b94181d4df57542b9379e331decb;hp=b2176374b98e5e678ec93acda28cc0891d1c3717;hpb=47e1993d32d4e0f9524c2147576468fe11e87b5f;p=~andy%2Flinux

diff --git a/mm/Kconfig b/mm/Kconfig
index b2176374b98..82fed4eb2b6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -389,3 +389,20 @@ config CLEANCACHE
 	  in a negligible performance hit.
 
 	  If unsure, say Y to enable cleancache
+
+config FRONTSWAP
+	bool "Enable frontswap to cache swap pages if tmem is present"
+	depends on SWAP
+	default n
+	help
+	  Frontswap is so named because it can be thought of as the opposite
+	  of a "backing" store for a swap device.  The data is stored into
+	  "transcendent memory", memory that is not directly accessible or
+	  addressable by the kernel and is of unknown and possibly
+	  time-varying size.  When space in transcendent memory is available,
+	  a significant swap I/O reduction may be achieved.  When none is
+	  available, all frontswap calls are reduced to a single pointer-
+	  compare-against-NULL resulting in a negligible performance hit
+	  and swap data is stored as normal on the matching swap device.
+
+	  If unsure, say Y to enable frontswap.