1if BLOCK
 2
 3menu "IO Schedulers"
 4
 5config 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
15config 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
24config 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
35config 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
42choice
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
58endchoice
 
59
60config DEFAULT_IOSCHED
61	string
62	default "deadline" if DEFAULT_DEADLINE
63	default "cfq" if DEFAULT_CFQ
64	default "noop" if DEFAULT_NOOP
 
65
66endmenu
67
68endif

 1# SPDX-License-Identifier: GPL-2.0
 
 2menu "IO Schedulers"
 3
 4config MQ_IOSCHED_DEADLINE
 5	tristate "MQ deadline I/O scheduler"
 
 
 
 
 
 
 
 
 
 
 6	default y
 7	help
 8	  MQ version of the deadline IO scheduler.
 
 
 
 9
10config MQ_IOSCHED_KYBER
11	tristate "Kyber I/O scheduler"
12	default y
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
13	help
14	  The Kyber I/O scheduler is a low-overhead scheduler suitable for
15	  multiqueue and other fast devices. Given target latencies for reads and
16	  synchronous writes, it will self-tune queue depths to achieve that
17	  goal.
18
19config IOSCHED_BFQ
20	tristate "BFQ I/O scheduler"
21	select BLK_ICQ
22	help
23	BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
24	of the device among all processes according to their weights,
25	regardless of the device parameters and with any workload. It
26	also guarantees a low latency to interactive and soft
27	real-time applications.  Details in
28	Documentation/block/bfq-iosched.rst
29
30config BFQ_GROUP_IOSCHED
31       bool "BFQ hierarchical scheduling support"
32       depends on IOSCHED_BFQ && BLK_CGROUP
33       default y
34       select BLK_CGROUP_RWSTAT
35	help
36
37       Enable hierarchical scheduling in BFQ, using the blkio
38       (cgroups-v1) or io (cgroups-v2) controller.
39
40config BFQ_CGROUP_DEBUG
41	bool "BFQ IO controller debugging"
42	depends on BFQ_GROUP_IOSCHED
43	help
44	Enable some debugging help. Currently it exports additional stat
45	files in a cgroup which can be useful for debugging.
46
47endmenu