1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * A scheduler with every callback defined.
4 *
5 * This scheduler defines every callback.
6 *
7 * Copyright (c) 2024 Meta Platforms, Inc. and affiliates.
8 * Copyright (c) 2024 David Vernet <dvernet@meta.com>
9 */
10
11 #include <scx/common.bpf.h>
12
13 char _license[] SEC("license") = "GPL";
14
15 s32 BPF_STRUCT_OPS(maximal_select_cpu, struct task_struct *p, s32 prev_cpu,
16 u64 wake_flags)
17 {
18 return prev_cpu;
19 }
20
21 void BPF_STRUCT_OPS(maximal_enqueue, struct task_struct *p, u64 enq_flags)
22 {
23 scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);
24 }
25
26 void BPF_STRUCT_OPS(maximal_dequeue, struct task_struct *p, u64 deq_flags)
27 {}
28
29 void BPF_STRUCT_OPS(maximal_dispatch, s32 cpu, struct task_struct *prev)
30 {
31 scx_bpf_consume(SCX_DSQ_GLOBAL);
32 }
33
34 void BPF_STRUCT_OPS(maximal_runnable, struct task_struct *p, u64 enq_flags)
35 {}
36
37 void BPF_STRUCT_OPS(maximal_running, struct task_struct *p)
38 {}
39
40 void BPF_STRUCT_OPS(maximal_stopping, struct task_struct *p, bool runnable)
41 {}
42
43 void BPF_STRUCT_OPS(maximal_quiescent, struct task_struct *p, u64 deq_flags)
44 {}
45
46 bool BPF_STRUCT_OPS(maximal_yield, struct task_struct *from,
47 struct task_struct *to)
48 {
49 return false;
50 }
51
52 bool BPF_STRUCT_OPS(maximal_core_sched_before, struct task_struct *a,
53 struct task_struct *b)
54 {
55 return false;
56 }
57
58 void BPF_STRUCT_OPS(maximal_set_weight, struct task_struct *p, u32 weight)
59 {}
60
61 void BPF_STRUCT_OPS(maximal_set_cpumask, struct task_struct *p,
62 const struct cpumask *cpumask)
63 {}
64
65 void BPF_STRUCT_OPS(maximal_update_idle, s32 cpu, bool idle)
66 {}
67
68 void BPF_STRUCT_OPS(maximal_cpu_acquire, s32 cpu,
69 struct scx_cpu_acquire_args *args)
70 {}
71
72 void BPF_STRUCT_OPS(maximal_cpu_release, s32 cpu,
73 struct scx_cpu_release_args *args)
74 {}
75
76 void BPF_STRUCT_OPS(maximal_cpu_online, s32 cpu)
77 {}
78
79 void BPF_STRUCT_OPS(maximal_cpu_offline, s32 cpu)
80 {}
81
82 s32 BPF_STRUCT_OPS(maximal_init_task, struct task_struct *p,
83 struct scx_init_task_args *args)
84 {
85 return 0;
86 }
87
88 void BPF_STRUCT_OPS(maximal_enable, struct task_struct *p)
89 {}
90
91 void BPF_STRUCT_OPS(maximal_exit_task, struct task_struct *p,
92 struct scx_exit_task_args *args)
93 {}
94
95 void BPF_STRUCT_OPS(maximal_disable, struct task_struct *p)
96 {}
97
98 s32 BPF_STRUCT_OPS(maximal_cgroup_init, struct cgroup *cgrp,
99 struct scx_cgroup_init_args *args)
100 {
101 return 0;
102 }
103
104 void BPF_STRUCT_OPS(maximal_cgroup_exit, struct cgroup *cgrp)
105 {}
106
107 s32 BPF_STRUCT_OPS(maximal_cgroup_prep_move, struct task_struct *p,
108 struct cgroup *from, struct cgroup *to)
109 {
110 return 0;
111 }
112
113 void BPF_STRUCT_OPS(maximal_cgroup_move, struct task_struct *p,
114 struct cgroup *from, struct cgroup *to)
115 {}
116
117 void BPF_STRUCT_OPS(maximal_cgroup_cancel_move, struct task_struct *p,
118 struct cgroup *from, struct cgroup *to)
119 {}
120
121 void BPF_STRUCT_OPS(maximal_cgroup_set_weight, struct cgroup *cgrp, u32 weight)
122 {}
123
124 s32 BPF_STRUCT_OPS_SLEEPABLE(maximal_init)
125 {
126 return 0;
127 }
128
129 void BPF_STRUCT_OPS(maximal_exit, struct scx_exit_info *info)
130 {}
131
132 SEC(".struct_ops.link")
133 struct sched_ext_ops maximal_ops = {
134 .select_cpu = (void *) maximal_select_cpu,
135 .enqueue = (void *) maximal_enqueue,
136 .dequeue = (void *) maximal_dequeue,
137 .dispatch = (void *) maximal_dispatch,
138 .runnable = (void *) maximal_runnable,
139 .running = (void *) maximal_running,
140 .stopping = (void *) maximal_stopping,
141 .quiescent = (void *) maximal_quiescent,
142 .yield = (void *) maximal_yield,
143 .core_sched_before = (void *) maximal_core_sched_before,
144 .set_weight = (void *) maximal_set_weight,
145 .set_cpumask = (void *) maximal_set_cpumask,
146 .update_idle = (void *) maximal_update_idle,
147 .cpu_acquire = (void *) maximal_cpu_acquire,
148 .cpu_release = (void *) maximal_cpu_release,
149 .cpu_online = (void *) maximal_cpu_online,
150 .cpu_offline = (void *) maximal_cpu_offline,
151 .init_task = (void *) maximal_init_task,
152 .enable = (void *) maximal_enable,
153 .exit_task = (void *) maximal_exit_task,
154 .disable = (void *) maximal_disable,
155 .cgroup_init = (void *) maximal_cgroup_init,
156 .cgroup_exit = (void *) maximal_cgroup_exit,
157 .cgroup_prep_move = (void *) maximal_cgroup_prep_move,
158 .cgroup_move = (void *) maximal_cgroup_move,
159 .cgroup_cancel_move = (void *) maximal_cgroup_cancel_move,
160 .cgroup_set_weight = (void *) maximal_cgroup_set_weight,
161 .init = (void *) maximal_init,
162 .exit = (void *) maximal_exit,
163 .name = "maximal",
164 };
165
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