[mirror_ubuntu-bionic-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

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	prompt "Default I/O scheduler"
	44	default DEFAULT_CFQ
	45	help
	46	Select the I/O scheduler which will be used by default for all
	47	block devices.
	48
	49	config DEFAULT_DEADLINE
	50	bool "Deadline" if IOSCHED_DEADLINE=y
	51
	52	config DEFAULT_CFQ
	53	bool "CFQ" if IOSCHED_CFQ=y
	54
	55	config DEFAULT_NOOP
	56	bool "No-op"
	57
	58	endchoice
	59
	60	config DEFAULT_IOSCHED
	61	string
	62	default "deadline" if DEFAULT_DEADLINE
	63	default "cfq" if DEFAULT_CFQ
	64	default "noop" if DEFAULT_NOOP
	65
	66	config MQ_IOSCHED_DEADLINE
	67	tristate "MQ deadline I/O scheduler"
	68	default y
	69	---help---
	70	MQ version of the deadline IO scheduler.
	71
	72	config MQ_IOSCHED_KYBER
	73	tristate "Kyber I/O scheduler"
	74	default y
	75	---help---
	76	The Kyber I/O scheduler is a low-overhead scheduler suitable for
	77	multiqueue and other fast devices. Given target latencies for reads and
	78	synchronous writes, it will self-tune queue depths to achieve that
	79	goal.
	80
	81	config IOSCHED_BFQ
	82	tristate "BFQ I/O scheduler"
	83	default n
	84	---help---
	85	BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
	86	of the device among all processes according to their weights,
	87	regardless of the device parameters and with any workload. It
	88	also guarantees a low latency to interactive and soft
	89	real-time applications. Details in
	90	Documentation/block/bfq-iosched.txt
	91
	92	endmenu
	93
	94	endif