[linux.git] / block / Kconfig.iosched

# SPDX-License-Identifier: GPL-2.0
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
b2441318	1	# SPDX-License-Identifier: GPL-2.0
9361401e	2	if BLOCK
1da177e4 LT	3
	4	menu "IO Schedulers"
	5
	6	config IOSCHED_NOOP
	7	bool
	8	default y
	9	---help---
	10	The no-op I/O scheduler is a minimal scheduler that does basic merging
	11	and sorting. Its main uses include non-disk based block devices like
	12	memory devices, and specialised software or hardware environments
	13	that do their own scheduling and require only minimal assistance from
	14	the kernel.
	15
1da177e4 LT	16	config IOSCHED_DEADLINE
	17	tristate "Deadline I/O scheduler"
	18	default y
	19	---help---
492af635 JA	20	The deadline I/O scheduler is simple and compact. It will provide
	21	CSCAN service with FIFO expiration of requests, switching to
	22	a new point in the service tree and doing a batch of IO from there
	23	in case of expiry.
1da177e4 LT	24
	25	config IOSCHED_CFQ
	26	tristate "CFQ I/O scheduler"
	27	default y
	28	---help---
	29	The CFQ I/O scheduler tries to distribute bandwidth equally
	30	among all processes in the system. It should provide a fair
08dc8726 JA	31	and low latency working environment, suitable for both desktop
	32	and server systems.
	33
a8e14b95	34	This is the default I/O scheduler.
1da177e4	35
25bc6b07 VG	36	config CFQ_GROUP_IOSCHED
25bc6b07 VG	37	bool "CFQ Group Scheduling support"
afc24d49	38	depends on IOSCHED_CFQ && BLK_CGROUP
25bc6b07 VG	39	default n
	40	---help---
	41	Enable group IO scheduling in CFQ.
	42
131dda7f	43	choice
e21b7a0b	44
131dda7f	45	prompt "Default I/O scheduler"
b17fd9bc	46	default DEFAULT_CFQ
131dda7f ND	47	help
	48	Select the I/O scheduler which will be used by default for all
	49	block devices.
	50
131dda7f	51	config DEFAULT_DEADLINE
c6ea2ba7	52	bool "Deadline" if IOSCHED_DEADLINE=y
131dda7f ND	53
131dda7f ND	54	config DEFAULT_CFQ
c6ea2ba7	55	bool "CFQ" if IOSCHED_CFQ=y
131dda7f ND	56
	57	config DEFAULT_NOOP
	58	bool "No-op"
	59
	60	endchoice
	61
	62	config DEFAULT_IOSCHED
	63	string
131dda7f ND	64	default "deadline" if DEFAULT_DEADLINE
	65	default "cfq" if DEFAULT_CFQ
	66	default "noop" if DEFAULT_NOOP
	67
d3484991 JA	68	config MQ_IOSCHED_DEADLINE
	69	tristate "MQ deadline I/O scheduler"
	70	default y
	71	---help---
	72	MQ version of the deadline IO scheduler.
	73
00e04393 OS	74	config MQ_IOSCHED_KYBER
	75	tristate "Kyber I/O scheduler"
	76	default y
	77	---help---
	78	The Kyber I/O scheduler is a low-overhead scheduler suitable for
	79	multiqueue and other fast devices. Given target latencies for reads and
	80	synchronous writes, it will self-tune queue depths to achieve that
	81	goal.
	82
aee69d78 PV	83	config IOSCHED_BFQ
	84	tristate "BFQ I/O scheduler"
	85	default n
	86	---help---
	87	BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
	88	of the device among all processes according to their weights,
	89	regardless of the device parameters and with any workload. It
	90	also guarantees a low latency to interactive and soft
	91	real-time applications. Details in
	92	Documentation/block/bfq-iosched.txt
	93
e21b7a0b AA	94	config BFQ_GROUP_IOSCHED
	95	bool "BFQ hierarchical scheduling support"
	96	depends on IOSCHED_BFQ && BLK_CGROUP
	97	default n
	98	---help---
	99
	100	Enable hierarchical scheduling in BFQ, using the blkio
	101	(cgroups-v1) or io (cgroups-v2) controller.
	102
1da177e4	103	endmenu
9361401e DH	104
9361401e DH	105	endif