| 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | if BLOCK |
| 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 | |
| 16 | config IOSCHED_DEADLINE |
| 17 | tristate "Deadline I/O scheduler" |
| 18 | default y |
| 19 | ---help--- |
| 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. |
| 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 |
| 31 | and low latency working environment, suitable for both desktop |
| 32 | and server systems. |
| 33 | |
| 34 | This is the default I/O scheduler. |
| 35 | |
| 36 | config CFQ_GROUP_IOSCHED |
| 37 | bool "CFQ Group Scheduling support" |
| 38 | depends on IOSCHED_CFQ && BLK_CGROUP |
| 39 | ---help--- |
| 40 | Enable group IO scheduling in CFQ. |
| 41 | |
| 42 | choice |
| 43 | |
| 44 | prompt "Default I/O scheduler" |
| 45 | default DEFAULT_CFQ |
| 46 | help |
| 47 | Select the I/O scheduler which will be used by default for all |
| 48 | block devices. |
| 49 | |
| 50 | config DEFAULT_DEADLINE |
| 51 | bool "Deadline" if IOSCHED_DEADLINE=y |
| 52 | |
| 53 | config DEFAULT_CFQ |
| 54 | bool "CFQ" if IOSCHED_CFQ=y |
| 55 | |
| 56 | config DEFAULT_NOOP |
| 57 | bool "No-op" |
| 58 | |
| 59 | endchoice |
| 60 | |
| 61 | config DEFAULT_IOSCHED |
| 62 | string |
| 63 | default "deadline" if DEFAULT_DEADLINE |
| 64 | default "cfq" if DEFAULT_CFQ |
| 65 | default "noop" if DEFAULT_NOOP |
| 66 | |
| 67 | config MQ_IOSCHED_DEADLINE |
| 68 | tristate "MQ deadline I/O scheduler" |
| 69 | default y |
| 70 | ---help--- |
| 71 | MQ version of the deadline IO scheduler. |
| 72 | |
| 73 | config 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 | |
| 82 | config IOSCHED_BFQ |
| 83 | tristate "BFQ I/O scheduler" |
| 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 | config BFQ_GROUP_IOSCHED |
| 93 | bool "BFQ hierarchical scheduling support" |
| 94 | depends on IOSCHED_BFQ && BLK_CGROUP |
| 95 | ---help--- |
| 96 | |
| 97 | Enable hierarchical scheduling in BFQ, using the blkio |
| 98 | (cgroups-v1) or io (cgroups-v2) controller. |
| 99 | |
| 100 | endmenu |
| 101 | |
| 102 | endif |