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+if BLOCK
+
+menu "IO Schedulers"
+
+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
+ default n
+ ---help---
+ Enable group IO scheduling in CFQ.
+
+config IOSCHED_BFQ
+ tristate "BFQ I/O scheduler"
+ default y
+ ---help---
+ The BFQ I/O scheduler tries to distribute bandwidth among
+ all processes according to their weights.
+ It aims at distributing the bandwidth as desired, independently of
+ the disk parameters and with any workload. It also tries to
+ guarantee low latency to interactive and soft real-time
+ applications. If compiled built-in (saying Y here), BFQ can
+ be configured to support hierarchical scheduling.
+
+config CGROUP_BFQIO
+ bool "BFQ hierarchical scheduling support"
+ depends on CGROUPS && IOSCHED_BFQ=y
+ default n
+ ---help---
+ Enable hierarchical scheduling in BFQ, using the cgroups
+ filesystem interface. The name of the subsystem will be
+ bfqio.
+
+choice
+ prompt "Default I/O scheduler"
+ default DEFAULT_BFQ
+ 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_BFQ
+ bool "BFQ" if IOSCHED_BFQ=y
+ help
+ Selects BFQ as the default I/O scheduler which will be
+ used by default for all block devices.
+ The BFQ I/O scheduler aims at distributing the bandwidth
+ as desired, independently of the disk parameters and with
+ any workload. It also tries to guarantee low latency to
+ interactive and soft real-time applications.
+
+ config DEFAULT_NOOP
+ bool "No-op"
+
+endchoice
+
+config DEFAULT_IOSCHED
+ string
+ default "deadline" if DEFAULT_DEADLINE
+ default "cfq" if DEFAULT_CFQ
+ default "bfq" if DEFAULT_BFQ
+ default "noop" if DEFAULT_NOOP
+
+endmenu
+
+endif