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Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
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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 | 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 |
45 | help |
46 | Select the I/O scheduler which will be used by default for all |
47 | block devices. |
48 | |
49 | config DEFAULT_DEADLINE |
50 | bool "Deadline" if IOSCHED_DEADLINE=y |
51 | |
52 | config DEFAULT_CFQ |
53 | bool "CFQ" if IOSCHED_CFQ=y |
54 | |
55 | config DEFAULT_NOOP |
56 | bool "No-op" |
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 |
65 | |
66 | endmenu |
67 | |
68 | endif |
69 |
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jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9