Root/
1 | /* |
2 | * Disregards a certain amount of sleep time (sched_latency_ns) and |
3 | * considers the task to be running during that period. This gives it |
4 | * a service deficit on wakeup, allowing it to run sooner. |
5 | */ |
6 | SCHED_FEAT(FAIR_SLEEPERS, 1) |
7 | |
8 | /* |
9 | * Only give sleepers 50% of their service deficit. This allows |
10 | * them to run sooner, but does not allow tons of sleepers to |
11 | * rip the spread apart. |
12 | */ |
13 | SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1) |
14 | |
15 | /* |
16 | * By not normalizing the sleep time, heavy tasks get an effective |
17 | * longer period, and lighter task an effective shorter period they |
18 | * are considered running. |
19 | */ |
20 | SCHED_FEAT(NORMALIZED_SLEEPER, 0) |
21 | |
22 | /* |
23 | * Place new tasks ahead so that they do not starve already running |
24 | * tasks |
25 | */ |
26 | SCHED_FEAT(START_DEBIT, 1) |
27 | |
28 | /* |
29 | * Should wakeups try to preempt running tasks. |
30 | */ |
31 | SCHED_FEAT(WAKEUP_PREEMPT, 1) |
32 | |
33 | /* |
34 | * Compute wakeup_gran based on task behaviour, clipped to |
35 | * [0, sched_wakeup_gran_ns] |
36 | */ |
37 | SCHED_FEAT(ADAPTIVE_GRAN, 1) |
38 | |
39 | /* |
40 | * When converting the wakeup granularity to virtual time, do it such |
41 | * that heavier tasks preempting a lighter task have an edge. |
42 | */ |
43 | SCHED_FEAT(ASYM_GRAN, 1) |
44 | |
45 | /* |
46 | * Always wakeup-preempt SYNC wakeups, see SYNC_WAKEUPS. |
47 | */ |
48 | SCHED_FEAT(WAKEUP_SYNC, 0) |
49 | |
50 | /* |
51 | * Wakeup preempt based on task behaviour. Tasks that do not overlap |
52 | * don't get preempted. |
53 | */ |
54 | SCHED_FEAT(WAKEUP_OVERLAP, 0) |
55 | |
56 | /* |
57 | * Use the SYNC wakeup hint, pipes and the likes use this to indicate |
58 | * the remote end is likely to consume the data we just wrote, and |
59 | * therefore has cache benefit from being placed on the same cpu, see |
60 | * also AFFINE_WAKEUPS. |
61 | */ |
62 | SCHED_FEAT(SYNC_WAKEUPS, 1) |
63 | |
64 | /* |
65 | * Based on load and program behaviour, see if it makes sense to place |
66 | * a newly woken task on the same cpu as the task that woke it -- |
67 | * improve cache locality. Typically used with SYNC wakeups as |
68 | * generated by pipes and the like, see also SYNC_WAKEUPS. |
69 | */ |
70 | SCHED_FEAT(AFFINE_WAKEUPS, 1) |
71 | |
72 | /* |
73 | * Weaken SYNC hint based on overlap |
74 | */ |
75 | SCHED_FEAT(SYNC_LESS, 1) |
76 | |
77 | /* |
78 | * Add SYNC hint based on overlap |
79 | */ |
80 | SCHED_FEAT(SYNC_MORE, 0) |
81 | |
82 | /* |
83 | * Prefer to schedule the task we woke last (assuming it failed |
84 | * wakeup-preemption), since its likely going to consume data we |
85 | * touched, increases cache locality. |
86 | */ |
87 | SCHED_FEAT(NEXT_BUDDY, 0) |
88 | |
89 | /* |
90 | * Prefer to schedule the task that ran last (when we did |
91 | * wake-preempt) as that likely will touch the same data, increases |
92 | * cache locality. |
93 | */ |
94 | SCHED_FEAT(LAST_BUDDY, 1) |
95 | |
96 | /* |
97 | * Consider buddies to be cache hot, decreases the likelyness of a |
98 | * cache buddy being migrated away, increases cache locality. |
99 | */ |
100 | SCHED_FEAT(CACHE_HOT_BUDDY, 1) |
101 | |
102 | /* |
103 | * Use arch dependent cpu power functions |
104 | */ |
105 | SCHED_FEAT(ARCH_POWER, 0) |
106 | |
107 | SCHED_FEAT(HRTICK, 0) |
108 | SCHED_FEAT(DOUBLE_TICK, 0) |
109 | SCHED_FEAT(LB_BIAS, 1) |
110 | SCHED_FEAT(LB_SHARES_UPDATE, 1) |
111 | SCHED_FEAT(ASYM_EFF_LOAD, 1) |
112 | |
113 | /* |
114 | * Spin-wait on mutex acquisition when the mutex owner is running on |
115 | * another cpu -- assumes that when the owner is running, it will soon |
116 | * release the lock. Decreases scheduling overhead. |
117 | */ |
118 | SCHED_FEAT(OWNER_SPIN, 1) |
119 |
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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