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.

  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

  endmenu

  
  endif