--- block/Kconfig.iosched

+++ block/Kconfig.iosched

@@ -43,6 +43,13 @@ config CFQ_GROUP_IOSCHED

---help---

Enable group IO scheduling in CFQ.

+config IOSCHED_VR

+ tristate "V(R) I/O scheduler"

+ default n

+ ---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

@@ -56,6 +63,9 @@ choice

config DEFAULT_CFQ

bool "CFQ" if IOSCHED_CFQ=y

+ config DEFAULT_VR

+ bool "V(R)" if IOSCHED_VR=y

+

config DEFAULT_NOOP

bool "No-op"

@@ -65,6 +75,7 @@ config DEFAULT_IOSCHED

string

default "deadline" if DEFAULT_DEADLINE

default "cfq" if DEFAULT_CFQ

+ default "vr" if DEFAULT_VR

default "noop" if DEFAULT_NOOP

endmenu