1 # SPDX-License-Identifier: GPL-2.0 !! 1 if BLOCK
>> 2
2 menu "IO Schedulers" 3 menu "IO Schedulers"
3 4
4 config MQ_IOSCHED_DEADLINE !! 5 config IOSCHED_NOOP
5 tristate "MQ deadline I/O scheduler" !! 6 bool
6 default y 7 default y
7 help !! 8 ---help---
8 MQ version of the deadline IO schedu !! 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.
9 14
10 config MQ_IOSCHED_KYBER !! 15 config IOSCHED_DEADLINE
11 tristate "Kyber I/O scheduler" !! 16 tristate "Deadline I/O scheduler"
12 default y 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
13 help 45 help
14 The Kyber I/O scheduler is a low-ove !! 46 Select the I/O scheduler which will be used by default for all
15 multiqueue and other fast devices. G !! 47 block devices.
16 synchronous writes, it will self-tun <<
17 goal. <<
18 <<
19 config IOSCHED_BFQ <<
20 tristate "BFQ I/O scheduler" <<
21 select BLK_ICQ <<
22 help <<
23 BFQ I/O scheduler for BLK-MQ. BFQ dist <<
24 of the device among all processes acco <<
25 regardless of the device parameters an <<
26 also guarantees a low latency to inter <<
27 real-time applications. Details in <<
28 Documentation/block/bfq-iosched.rst <<
29 <<
30 config BFQ_GROUP_IOSCHED <<
31 bool "BFQ hierarchical scheduling suppo <<
32 depends on IOSCHED_BFQ && BLK_CGROUP <<
33 default y <<
34 select BLK_CGROUP_RWSTAT <<
35 help <<
36 48
37 Enable hierarchical scheduling in BFQ, !! 49 config DEFAULT_DEADLINE
38 (cgroups-v1) or io (cgroups-v2) control !! 50 bool "Deadline" if IOSCHED_DEADLINE=y
39 51
40 config BFQ_CGROUP_DEBUG !! 52 config DEFAULT_CFQ
41 bool "BFQ IO controller debugging" !! 53 bool "CFQ" if IOSCHED_CFQ=y
42 depends on BFQ_GROUP_IOSCHED !! 54
43 help !! 55 config DEFAULT_NOOP
44 Enable some debugging help. Currently !! 56 bool "No-op"
45 files in a cgroup which can be useful !! 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
46 65
47 endmenu 66 endmenu
>> 67
>> 68 endif
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