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
15 config IOSCHED_DEADLINE
16 tristate "Deadline I/O scheduler"
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
25 tristate "CFQ I/O scheduler"
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
33 This is the default I/O scheduler.
35 config CFQ_GROUP_IOSCHED
36 bool "CFQ Group Scheduling support"
37 depends on IOSCHED_CFQ && BLK_CGROUP
40 Enable group IO scheduling in CFQ.
43 prompt "Default I/O scheduler"
46 Select the I/O scheduler which will be used by default for all
49 config DEFAULT_DEADLINE
50 bool "Deadline" if IOSCHED_DEADLINE=y
53 bool "CFQ" if IOSCHED_CFQ=y
60 config DEFAULT_IOSCHED
62 default "deadline" if DEFAULT_DEADLINE
63 default "cfq" if DEFAULT_CFQ
64 default "noop" if DEFAULT_NOOP
66 config MQ_IOSCHED_DEADLINE
67 tristate "MQ deadline I/O scheduler"
70 MQ version of the deadline IO scheduler.
72 config MQ_IOSCHED_NONE
77 prompt "Default single-queue blk-mq I/O scheduler"
78 default DEFAULT_SQ_NONE
80 Select the I/O scheduler which will be used by default for blk-mq
81 managed block devices with a single queue.
83 config DEFAULT_SQ_DEADLINE
84 bool "MQ Deadline" if MQ_IOSCHED_DEADLINE=y
86 config DEFAULT_SQ_NONE
91 config DEFAULT_SQ_IOSCHED
93 default "mq-deadline" if DEFAULT_SQ_DEADLINE
94 default "none" if DEFAULT_SQ_NONE
97 prompt "Default multi-queue blk-mq I/O scheduler"
98 default DEFAULT_MQ_NONE
100 Select the I/O scheduler which will be used by default for blk-mq
101 managed block devices with multiple queues.
103 config DEFAULT_MQ_DEADLINE
104 bool "MQ Deadline" if MQ_IOSCHED_DEADLINE=y
106 config DEFAULT_MQ_NONE
111 config DEFAULT_MQ_IOSCHED
113 default "mq-deadline" if DEFAULT_MQ_DEADLINE
114 default "none" if DEFAULT_MQ_NONE