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1 | if BLOCK |
2 | |
3 | menu "IO Schedulers" |
4 | |
5 | config 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 | |
15 | config 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 | |
24 | config IOSCHED_CFQ |
25 | tristate "CFQ I/O scheduler" |
26 | select BLK_CGROUP if CFQ_GROUP_IOSCHED |
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 && CGROUPS |
39 | default n |
40 | ---help--- |
41 | Enable group IO scheduling in CFQ. |
42 | |
43 | config DEBUG_CFQ_IOSCHED |
44 | bool "Debug CFQ Scheduling" |
45 | depends on CFQ_GROUP_IOSCHED |
46 | select DEBUG_BLK_CGROUP |
47 | default n |
48 | ---help--- |
49 | Enable CFQ IO scheduling debugging in CFQ. Currently it makes |
50 | blktrace output more verbose. |
51 | |
52 | choice |
53 | prompt "Default I/O scheduler" |
54 | default DEFAULT_CFQ |
55 | help |
56 | Select the I/O scheduler which will be used by default for all |
57 | block devices. |
58 | |
59 | config DEFAULT_DEADLINE |
60 | bool "Deadline" if IOSCHED_DEADLINE=y |
61 | |
62 | config DEFAULT_CFQ |
63 | bool "CFQ" if IOSCHED_CFQ=y |
64 | |
65 | config DEFAULT_NOOP |
66 | bool "No-op" |
67 | |
68 | endchoice |
69 | |
70 | config DEFAULT_IOSCHED |
71 | string |
72 | default "deadline" if DEFAULT_DEADLINE |
73 | default "cfq" if DEFAULT_CFQ |
74 | default "noop" if DEFAULT_NOOP |
75 | |
76 | endmenu |
77 | |
78 | endif |
79 |
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