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_SLEEPABLE(maximal_init) 99 { 100 return 0; 101 } 102 103 void BPF_STRUCT_OPS(maximal_exit, struct scx_exit_info *info) 104 {} 105 106 SEC(".struct_ops.link") 107 struct sched_ext_ops maximal_ops = { 108 .select_cpu = maximal_select_cpu, 109 .enqueue = maximal_enqueue, 110 .dequeue = maximal_dequeue, 111 .dispatch = maximal_dispatch, 112 .runnable = maximal_runnable, 113 .running = maximal_running, 114 .stopping = maximal_stopping, 115 .quiescent = maximal_quiescent, 116 .yield = maximal_yield, 117 .core_sched_before = maximal_core_sched_before, 118 .set_weight = maximal_set_weight, 119 .set_cpumask = maximal_set_cpumask, 120 .update_idle = maximal_update_idle, 121 .cpu_acquire = maximal_cpu_acquire, 122 .cpu_release = maximal_cpu_release, 123 .cpu_online = maximal_cpu_online, 124 .cpu_offline = maximal_cpu_offline, 125 .init_task = maximal_init_task, 126 .enable = maximal_enable, 127 .exit_task = maximal_exit_task, 128 .disable = maximal_disable, 129 .init = maximal_init, 130 .exit = maximal_exit, 131 .name = "maximal", 132 }; 133