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 <[email protected]>
9 */
10
11 #include <scx/common.bpf.h>
12
13 char _license[] SEC("license") = "GPL";
14
15 #define DSQ_ID 0
16
BPF_STRUCT_OPS(maximal_select_cpu,struct task_struct * p,s32 prev_cpu,u64 wake_flags)17 s32 BPF_STRUCT_OPS(maximal_select_cpu, struct task_struct *p, s32 prev_cpu,
18 u64 wake_flags)
19 {
20 return prev_cpu;
21 }
22
BPF_STRUCT_OPS(maximal_enqueue,struct task_struct * p,u64 enq_flags)23 void BPF_STRUCT_OPS(maximal_enqueue, struct task_struct *p, u64 enq_flags)
24 {
25 scx_bpf_dsq_insert(p, DSQ_ID, SCX_SLICE_DFL, enq_flags);
26 }
27
BPF_STRUCT_OPS(maximal_dequeue,struct task_struct * p,u64 deq_flags)28 void BPF_STRUCT_OPS(maximal_dequeue, struct task_struct *p, u64 deq_flags)
29 {}
30
BPF_STRUCT_OPS(maximal_dispatch,s32 cpu,struct task_struct * prev)31 void BPF_STRUCT_OPS(maximal_dispatch, s32 cpu, struct task_struct *prev)
32 {
33 scx_bpf_dsq_move_to_local(DSQ_ID);
34 }
35
BPF_STRUCT_OPS(maximal_runnable,struct task_struct * p,u64 enq_flags)36 void BPF_STRUCT_OPS(maximal_runnable, struct task_struct *p, u64 enq_flags)
37 {}
38
BPF_STRUCT_OPS(maximal_running,struct task_struct * p)39 void BPF_STRUCT_OPS(maximal_running, struct task_struct *p)
40 {}
41
BPF_STRUCT_OPS(maximal_stopping,struct task_struct * p,bool runnable)42 void BPF_STRUCT_OPS(maximal_stopping, struct task_struct *p, bool runnable)
43 {}
44
BPF_STRUCT_OPS(maximal_quiescent,struct task_struct * p,u64 deq_flags)45 void BPF_STRUCT_OPS(maximal_quiescent, struct task_struct *p, u64 deq_flags)
46 {}
47
BPF_STRUCT_OPS(maximal_yield,struct task_struct * from,struct task_struct * to)48 bool BPF_STRUCT_OPS(maximal_yield, struct task_struct *from,
49 struct task_struct *to)
50 {
51 return false;
52 }
53
BPF_STRUCT_OPS(maximal_core_sched_before,struct task_struct * a,struct task_struct * b)54 bool BPF_STRUCT_OPS(maximal_core_sched_before, struct task_struct *a,
55 struct task_struct *b)
56 {
57 return false;
58 }
59
BPF_STRUCT_OPS(maximal_set_weight,struct task_struct * p,u32 weight)60 void BPF_STRUCT_OPS(maximal_set_weight, struct task_struct *p, u32 weight)
61 {}
62
BPF_STRUCT_OPS(maximal_set_cpumask,struct task_struct * p,const struct cpumask * cpumask)63 void BPF_STRUCT_OPS(maximal_set_cpumask, struct task_struct *p,
64 const struct cpumask *cpumask)
65 {}
66
BPF_STRUCT_OPS(maximal_update_idle,s32 cpu,bool idle)67 void BPF_STRUCT_OPS(maximal_update_idle, s32 cpu, bool idle)
68 {}
69
BPF_STRUCT_OPS(maximal_cpu_acquire,s32 cpu,struct scx_cpu_acquire_args * args)70 void BPF_STRUCT_OPS(maximal_cpu_acquire, s32 cpu,
71 struct scx_cpu_acquire_args *args)
72 {}
73
BPF_STRUCT_OPS(maximal_cpu_release,s32 cpu,struct scx_cpu_release_args * args)74 void BPF_STRUCT_OPS(maximal_cpu_release, s32 cpu,
75 struct scx_cpu_release_args *args)
76 {}
77
BPF_STRUCT_OPS(maximal_cpu_online,s32 cpu)78 void BPF_STRUCT_OPS(maximal_cpu_online, s32 cpu)
79 {}
80
BPF_STRUCT_OPS(maximal_cpu_offline,s32 cpu)81 void BPF_STRUCT_OPS(maximal_cpu_offline, s32 cpu)
82 {}
83
BPF_STRUCT_OPS(maximal_init_task,struct task_struct * p,struct scx_init_task_args * args)84 s32 BPF_STRUCT_OPS(maximal_init_task, struct task_struct *p,
85 struct scx_init_task_args *args)
86 {
87 return 0;
88 }
89
BPF_STRUCT_OPS(maximal_enable,struct task_struct * p)90 void BPF_STRUCT_OPS(maximal_enable, struct task_struct *p)
91 {}
92
BPF_STRUCT_OPS(maximal_exit_task,struct task_struct * p,struct scx_exit_task_args * args)93 void BPF_STRUCT_OPS(maximal_exit_task, struct task_struct *p,
94 struct scx_exit_task_args *args)
95 {}
96
BPF_STRUCT_OPS(maximal_disable,struct task_struct * p)97 void BPF_STRUCT_OPS(maximal_disable, struct task_struct *p)
98 {}
99
BPF_STRUCT_OPS(maximal_cgroup_init,struct cgroup * cgrp,struct scx_cgroup_init_args * args)100 s32 BPF_STRUCT_OPS(maximal_cgroup_init, struct cgroup *cgrp,
101 struct scx_cgroup_init_args *args)
102 {
103 return 0;
104 }
105
BPF_STRUCT_OPS(maximal_cgroup_exit,struct cgroup * cgrp)106 void BPF_STRUCT_OPS(maximal_cgroup_exit, struct cgroup *cgrp)
107 {}
108
BPF_STRUCT_OPS(maximal_cgroup_prep_move,struct task_struct * p,struct cgroup * from,struct cgroup * to)109 s32 BPF_STRUCT_OPS(maximal_cgroup_prep_move, struct task_struct *p,
110 struct cgroup *from, struct cgroup *to)
111 {
112 return 0;
113 }
114
BPF_STRUCT_OPS(maximal_cgroup_move,struct task_struct * p,struct cgroup * from,struct cgroup * to)115 void BPF_STRUCT_OPS(maximal_cgroup_move, struct task_struct *p,
116 struct cgroup *from, struct cgroup *to)
117 {}
118
BPF_STRUCT_OPS(maximal_cgroup_cancel_move,struct task_struct * p,struct cgroup * from,struct cgroup * to)119 void BPF_STRUCT_OPS(maximal_cgroup_cancel_move, struct task_struct *p,
120 struct cgroup *from, struct cgroup *to)
121 {}
122
BPF_STRUCT_OPS(maximal_cgroup_set_weight,struct cgroup * cgrp,u32 weight)123 void BPF_STRUCT_OPS(maximal_cgroup_set_weight, struct cgroup *cgrp, u32 weight)
124 {}
125
BPF_STRUCT_OPS_SLEEPABLE(maximal_init)126 s32 BPF_STRUCT_OPS_SLEEPABLE(maximal_init)
127 {
128 return scx_bpf_create_dsq(DSQ_ID, -1);
129 }
130
BPF_STRUCT_OPS(maximal_exit,struct scx_exit_info * info)131 void BPF_STRUCT_OPS(maximal_exit, struct scx_exit_info *info)
132 {}
133
134 SEC(".struct_ops.link")
135 struct sched_ext_ops maximal_ops = {
136 .select_cpu = (void *) maximal_select_cpu,
137 .enqueue = (void *) maximal_enqueue,
138 .dequeue = (void *) maximal_dequeue,
139 .dispatch = (void *) maximal_dispatch,
140 .runnable = (void *) maximal_runnable,
141 .running = (void *) maximal_running,
142 .stopping = (void *) maximal_stopping,
143 .quiescent = (void *) maximal_quiescent,
144 .yield = (void *) maximal_yield,
145 .core_sched_before = (void *) maximal_core_sched_before,
146 .set_weight = (void *) maximal_set_weight,
147 .set_cpumask = (void *) maximal_set_cpumask,
148 .update_idle = (void *) maximal_update_idle,
149 .cpu_acquire = (void *) maximal_cpu_acquire,
150 .cpu_release = (void *) maximal_cpu_release,
151 .cpu_online = (void *) maximal_cpu_online,
152 .cpu_offline = (void *) maximal_cpu_offline,
153 .init_task = (void *) maximal_init_task,
154 .enable = (void *) maximal_enable,
155 .exit_task = (void *) maximal_exit_task,
156 .disable = (void *) maximal_disable,
157 .cgroup_init = (void *) maximal_cgroup_init,
158 .cgroup_exit = (void *) maximal_cgroup_exit,
159 .cgroup_prep_move = (void *) maximal_cgroup_prep_move,
160 .cgroup_move = (void *) maximal_cgroup_move,
161 .cgroup_cancel_move = (void *) maximal_cgroup_cancel_move,
162 .cgroup_set_weight = (void *) maximal_cgroup_set_weight,
163 .init = (void *) maximal_init,
164 .exit = (void *) maximal_exit,
165 .name = "maximal",
166 };
167