--- block/Kconfig.iosched

+++ block/Kconfig.iosched

@@ -50,6 +50,16 @@ config IOSCHED_VR

Requests are chosen according to SSTF with a penalty of rev_penalty

for switching head direction.

+config IOSCHED_SIO

+ tristate "Simple I/O scheduler"

+ default y

+ ---help---

+ The Simple I/O scheduler is an extremely simple scheduler,

+ based on noop and deadline, that relies on deadlines to

+ ensure fairness. The algorithm does not do any sorting but

+ basic merging, trying to keep a minimum overhead. It is aimed

+ mainly for aleatory access devices (eg: flash devices).

+

choice

prompt "Default I/O scheduler"

default DEFAULT_CFQ

@@ -63,6 +73,9 @@ choice

config DEFAULT_CFQ

bool "CFQ" if IOSCHED_CFQ=y

+ config DEFAULT_SIO

+ bool "SIO" if IOSCHED_SIO=y

+

config DEFAULT_VR

bool "V(R)" if IOSCHED_VR=y

@@ -75,6 +88,7 @@ config DEFAULT_IOSCHED

string

default "deadline" if DEFAULT_DEADLINE

default "cfq" if DEFAULT_CFQ

+ default "sio" if DEFAULT_SIO

default "vr" if DEFAULT_VR

default "noop" if DEFAULT_NOOP