1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * BPF extensible scheduler class: Documentation/scheduler/sched-ext.rst 4 * 5 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates. 6 * Copyright (c) 2022 Tejun Heo <tj@kernel.org> 7 * Copyright (c) 2022 David Vernet <dvernet@meta.com> 8 */ 9 #ifdef CONFIG_SCHED_CLASS_EXT 10 11 DECLARE_STATIC_KEY_FALSE(scx_ops_allow_queued_wakeup); 12 13 void scx_tick(struct rq *rq); 14 void init_scx_entity(struct sched_ext_entity *scx); 15 void scx_pre_fork(struct task_struct *p); 16 int scx_fork(struct task_struct *p); 17 void scx_post_fork(struct task_struct *p); 18 void scx_cancel_fork(struct task_struct *p); 19 bool scx_can_stop_tick(struct rq *rq); 20 void scx_rq_activate(struct rq *rq); 21 void scx_rq_deactivate(struct rq *rq); 22 int scx_check_setscheduler(struct task_struct *p, int policy); 23 bool task_should_scx(int policy); 24 void init_sched_ext_class(void); 25 26 static inline u32 scx_cpuperf_target(s32 cpu) 27 { 28 if (scx_enabled()) 29 return cpu_rq(cpu)->scx.cpuperf_target; 30 else 31 return 0; 32 } 33 34 static inline bool task_on_scx(const struct task_struct *p) 35 { 36 return scx_enabled() && p->sched_class == &ext_sched_class; 37 } 38 39 static inline bool scx_allow_ttwu_queue(const struct task_struct *p) 40 { 41 return !scx_enabled() || 42 static_branch_likely(&scx_ops_allow_queued_wakeup) || 43 p->sched_class != &ext_sched_class; 44 } 45 46 #ifdef CONFIG_SCHED_CORE 47 bool scx_prio_less(const struct task_struct *a, const struct task_struct *b, 48 bool in_fi); 49 #endif 50 51 #else /* CONFIG_SCHED_CLASS_EXT */ 52 53 static inline void scx_tick(struct rq *rq) {} 54 static inline void scx_pre_fork(struct task_struct *p) {} 55 static inline int scx_fork(struct task_struct *p) { return 0; } 56 static inline void scx_post_fork(struct task_struct *p) {} 57 static inline void scx_cancel_fork(struct task_struct *p) {} 58 static inline u32 scx_cpuperf_target(s32 cpu) { return 0; } 59 static inline bool scx_can_stop_tick(struct rq *rq) { return true; } 60 static inline void scx_rq_activate(struct rq *rq) {} 61 static inline void scx_rq_deactivate(struct rq *rq) {} 62 static inline int scx_check_setscheduler(struct task_struct *p, int policy) { return 0; } 63 static inline bool task_on_scx(const struct task_struct *p) { return false; } 64 static inline bool scx_allow_ttwu_queue(const struct task_struct *p) { return true; } 65 static inline void init_sched_ext_class(void) {} 66 67 #endif /* CONFIG_SCHED_CLASS_EXT */ 68 69 #if defined(CONFIG_SCHED_CLASS_EXT) && defined(CONFIG_SMP) 70 void __scx_update_idle(struct rq *rq, bool idle, bool do_notify); 71 72 static inline void scx_update_idle(struct rq *rq, bool idle, bool do_notify) 73 { 74 if (scx_enabled()) 75 __scx_update_idle(rq, idle, do_notify); 76 } 77 #else 78 static inline void scx_update_idle(struct rq *rq, bool idle, bool do_notify) {} 79 #endif 80 81 #ifdef CONFIG_CGROUP_SCHED 82 #ifdef CONFIG_EXT_GROUP_SCHED 83 int scx_tg_online(struct task_group *tg); 84 void scx_tg_offline(struct task_group *tg); 85 int scx_cgroup_can_attach(struct cgroup_taskset *tset); 86 void scx_cgroup_move_task(struct task_struct *p); 87 void scx_cgroup_finish_attach(void); 88 void scx_cgroup_cancel_attach(struct cgroup_taskset *tset); 89 void scx_group_set_weight(struct task_group *tg, unsigned long cgrp_weight); 90 void scx_group_set_idle(struct task_group *tg, bool idle); 91 #else /* CONFIG_EXT_GROUP_SCHED */ 92 static inline int scx_tg_online(struct task_group *tg) { return 0; } 93 static inline void scx_tg_offline(struct task_group *tg) {} 94 static inline int scx_cgroup_can_attach(struct cgroup_taskset *tset) { return 0; } 95 static inline void scx_cgroup_move_task(struct task_struct *p) {} 96 static inline void scx_cgroup_finish_attach(void) {} 97 static inline void scx_cgroup_cancel_attach(struct cgroup_taskset *tset) {} 98 static inline void scx_group_set_weight(struct task_group *tg, unsigned long cgrp_weight) {} 99 static inline void scx_group_set_idle(struct task_group *tg, bool idle) {} 100 #endif /* CONFIG_EXT_GROUP_SCHED */ 101 #endif /* CONFIG_CGROUP_SCHED */ 102