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block, bfq: add full hierarchical scheduling and cgroups support
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9361401e 1if BLOCK
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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
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15config IOSCHED_DEADLINE
16 tristate "Deadline I/O scheduler"
17 default y
18 ---help---
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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.
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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
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30 and low latency working environment, suitable for both desktop
31 and server systems.
32
a8e14b95 33 This is the default I/O scheduler.
1da177e4 34
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35config CFQ_GROUP_IOSCHED
36 bool "CFQ Group Scheduling support"
afc24d49 37 depends on IOSCHED_CFQ && BLK_CGROUP
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38 default n
39 ---help---
40 Enable group IO scheduling in CFQ.
41
131dda7f 42choice
e21b7a0b 43
131dda7f 44 prompt "Default I/O scheduler"
b17fd9bc 45 default DEFAULT_CFQ
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46 help
47 Select the I/O scheduler which will be used by default for all
48 block devices.
49
131dda7f 50 config DEFAULT_DEADLINE
c6ea2ba7 51 bool "Deadline" if IOSCHED_DEADLINE=y
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52
53 config DEFAULT_CFQ
c6ea2ba7 54 bool "CFQ" if IOSCHED_CFQ=y
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55
56 config DEFAULT_NOOP
57 bool "No-op"
58
59endchoice
60
61config DEFAULT_IOSCHED
62 string
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63 default "deadline" if DEFAULT_DEADLINE
64 default "cfq" if DEFAULT_CFQ
65 default "noop" if DEFAULT_NOOP
66
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67config MQ_IOSCHED_DEADLINE
68 tristate "MQ deadline I/O scheduler"
69 default y
70 ---help---
71 MQ version of the deadline IO scheduler.
72
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73config 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
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82config 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
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93config 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
1da177e4 102endmenu
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103
104endif