[mirror_ubuntu-artful-kernel.git] / block / Kconfig.iosched

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

config MQ_IOSCHED_DEADLINE
	tristate "MQ deadline I/O scheduler"
	default y
	---help---
	  MQ version of the deadline IO scheduler.

config MQ_IOSCHED_KYBER
	tristate "Kyber I/O scheduler"
	default y
	---help---
	  The Kyber I/O scheduler is a low-overhead scheduler suitable for
	  multiqueue and other fast devices. Given target latencies for reads and
	  synchronous writes, it will self-tune queue depths to achieve that
	  goal.

config IOSCHED_BFQ
	tristate "BFQ I/O scheduler"
	default n
	---help---
	BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
	of the device among all processes according to their weights,
	regardless of the device parameters and with any workload. It
	also guarantees a low latency to interactive and soft
	real-time applications.  Details in
	Documentation/block/bfq-iosched.txt

config BFQ_GROUP_IOSCHED
       bool "BFQ hierarchical scheduling support"
       depends on IOSCHED_BFQ && BLK_CGROUP
       default n
       ---help---

       Enable hierarchical scheduling in BFQ, using the blkio
       (cgroups-v1) or io (cgroups-v2) controller.

endmenu

endif
Commit	Line	Data
	1	if BLOCK
	2
	3	menu "IO Schedulers"
	4
	5	config IOSCHED_NOOP
	6	bool
	7	default y
	8	---help---
	9	The no-op I/O scheduler is a minimal scheduler that does basic merging
	10	and sorting. Its main uses include non-disk based block devices like
	11	memory devices, and specialised software or hardware environments
	12	that do their own scheduling and require only minimal assistance from
	13	the kernel.
	14
	15	config IOSCHED_DEADLINE
	16	tristate "Deadline I/O scheduler"
	17	default y
	18	---help---
	19	The deadline I/O scheduler is simple and compact. It will provide
	20	CSCAN service with FIFO expiration of requests, switching to
	21	a new point in the service tree and doing a batch of IO from there
	22	in case of expiry.
	23
	24	config IOSCHED_CFQ
	25	tristate "CFQ I/O scheduler"
	26	default y
	27	---help---
	28	The CFQ I/O scheduler tries to distribute bandwidth equally
	29	among all processes in the system. It should provide a fair
	30	and low latency working environment, suitable for both desktop
	31	and server systems.
	32
	33	This is the default I/O scheduler.
	34
	35	config CFQ_GROUP_IOSCHED
	36	bool "CFQ Group Scheduling support"
	37	depends on IOSCHED_CFQ && BLK_CGROUP
	38	default n
	39	---help---
	40	Enable group IO scheduling in CFQ.
	41
	42	choice
	43
	44	prompt "Default I/O scheduler"
	45	default DEFAULT_CFQ
	46	help
	47	Select the I/O scheduler which will be used by default for all
	48	block devices.
	49
	50	config DEFAULT_DEADLINE
	51	bool "Deadline" if IOSCHED_DEADLINE=y
	52
	53	config DEFAULT_CFQ
	54	bool "CFQ" if IOSCHED_CFQ=y
	55
	56	config DEFAULT_NOOP
	57	bool "No-op"
	58
	59	endchoice
	60
	61	config DEFAULT_IOSCHED
	62	string
	63	default "deadline" if DEFAULT_DEADLINE
	64	default "cfq" if DEFAULT_CFQ
	65	default "noop" if DEFAULT_NOOP
	66
	67	config MQ_IOSCHED_DEADLINE
	68	tristate "MQ deadline I/O scheduler"
	69	default y
	70	---help---
	71	MQ version of the deadline IO scheduler.
	72
	73	config MQ_IOSCHED_KYBER
	74	tristate "Kyber I/O scheduler"
	75	default y
	76	---help---
	77	The Kyber I/O scheduler is a low-overhead scheduler suitable for
	78	multiqueue and other fast devices. Given target latencies for reads and
	79	synchronous writes, it will self-tune queue depths to achieve that
	80	goal.
	81
	82	config IOSCHED_BFQ
	83	tristate "BFQ I/O scheduler"
	84	default n
	85	---help---
	86	BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
	87	of the device among all processes according to their weights,
	88	regardless of the device parameters and with any workload. It
	89	also guarantees a low latency to interactive and soft
	90	real-time applications. Details in
	91	Documentation/block/bfq-iosched.txt
	92
	93	config BFQ_GROUP_IOSCHED
	94	bool "BFQ hierarchical scheduling support"
	95	depends on IOSCHED_BFQ && BLK_CGROUP
	96	default n
	97	---help---
	98
	99	Enable hierarchical scheduling in BFQ, using the blkio
	100	(cgroups-v1) or io (cgroups-v2) controller.
	101
	102	endmenu
	103
	104	endif