--- block/Kconfig.iosched

+++ block/Kconfig.iosched

@@ -62,6 +62,14 @@ config CGROUP_BFQIO

filesystem interface. The name of the subsystem will be

bfqio.

+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

@@ -81,6 +89,9 @@ choice

config DEFAULT_BFQ

bool "BFQ" if IOSCHED_BFQ=y

+ config DEFAULT_VR

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

+

config DEFAULT_NOOP

bool "No-op"

@@ -93,6 +104,7 @@ config DEFAULT_IOSCHED

default "cfq" if DEFAULT_CFQ

default "bfq" if DEFAULT_BFQ

default "noop" if DEFAULT_NOOP

+ default "vr" if DEFAULT_VR

endmenu