Added V(R) Scheduler

arch/arm/configs/vigor_defconfig

@@ -167,9 +167,12 @@ CONFIG_IOSCHED_NOOP=y
 CONFIG_IOSCHED_DEADLINE=y
 CONFIG_IOSCHED_CFQ=y
 CONFIG_IOSCHED_SIO=y
+CONFIG_IOSCHED_VR=y
 CONFIG_DEFAULT_DEADLINE=y
 # CONFIG_DEFAULT_CFQ is not set
 # CONFIG_DEFAULT_NOOP is not set
+# CONFIG_DEFAULT_SIO is not set
+# CONFIG_DEFAULT_VR is not set
 CONFIG_DEFAULT_IOSCHED="deadline"
 # CONFIG_INLINE_SPIN_TRYLOCK is not set
 # CONFIG_INLINE_SPIN_TRYLOCK_BH is not set

block/Kconfig.iosched

@@ -53,6 +53,13 @@ config IOSCHED_SIO
 	  basic merging, trying to keep a minimum overhead. It is aimed
 	  mainly for aleatory access devices (eg: flash devices).
 
+config IOSCHED_VR
+	tristate "V(R) I/O scheduler"
+	default y
+	---help---
+	  Requests are chosen according to SSTF with a penalty of rev_penalty
+	  for switching head direction.
+
 choice
 	prompt "Default I/O scheduler"
 	default DEFAULT_CFQ
@@ -72,6 +79,9 @@ choice
 	config DEFAULT_SIO
 		bool "SIO" if IOSCHED_SIO=y
 
+	config DEFAULT_VR
+		bool "VR" if IOSCHED_VR=y
+
 endchoice
 
 config DEFAULT_IOSCHED
@@ -80,7 +90,7 @@ config DEFAULT_IOSCHED
 	default "cfq" if DEFAULT_CFQ
 	default "noop" if DEFAULT_NOOP
 	default "sio" if DEFAULT_SIO
-
+	default "vr" if DEFAULT_SIO
 endmenu
 
 endif

block/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_IOSCHED_NOOP)	+= noop-iosched.o
 obj-$(CONFIG_IOSCHED_DEADLINE)	+= deadline-iosched.o
 obj-$(CONFIG_IOSCHED_CFQ)	+= cfq-iosched.o
 obj-$(CONFIG_IOSCHED_SIO)       += sio-iosched.o
+obj-$(CONFIG_IOSCHED_SIO)       += vr-iosched.o
 
 obj-$(CONFIG_BLOCK_COMPAT)	+= compat_ioctl.o
 obj-$(CONFIG_BLK_DEV_INTEGRITY)	+= blk-integrity.o