config IOSCHED_NOOP

bool

default y

---help---

The no-op I/O scheduler is a minimal scheduler that does basic merging

and sorting. Its main uses include non-disk based block devices like

memory devices, and specialised software or hardware environments

that do their own scheduling and require only minimal assistance from

the kernel.

config IOSCHED_DEADLINE

tristate "Deadline I/O scheduler"

default y

---help---

The deadline I/O scheduler is simple and compact. It will provide

CSCAN service with FIFO expiration of requests, switching to

a new point in the service tree and doing a batch of IO from there

in case of expiry.

config IOSCHED_CFQ

tristate "CFQ I/O scheduler"

default y

---help---

The CFQ I/O scheduler tries to distribute bandwidth equally

among all processes in the system. It should provide a fair

and low latency working environment, suitable for both desktop

and server systems.

This is the default I/O scheduler.

config CFQ_GROUP_IOSCHED

bool "CFQ Group Scheduling support"

depends on IOSCHED_CFQ && BLK_CGROUP

---help---

Enable group IO scheduling in CFQ.

choice

prompt "Default I/O scheduler"

default DEFAULT_CFQ

help

Select the I/O scheduler which will be used by default for all

block devices.

config DEFAULT_DEADLINE

bool "Deadline" if IOSCHED_DEADLINE=y

config DEFAULT_CFQ

bool "CFQ" if IOSCHED_CFQ=y

config DEFAULT_NOOP

bool "No-op"

endchoice

config DEFAULT_IOSCHED

string

default "deadline" if DEFAULT_DEADLINE

default "cfq" if DEFAULT_CFQ

default "noop" if DEFAULT_NOOP

obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o

obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o

obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o