kernel/sched/ext.h

File Facts

System

Linux kernel

Corpus path

kernel/sched/ext.h

Extension

.h

Size

3929 bytes

Lines

96

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• function scx_cpuperf_target
• function task_on_scx
• function scx_tick
• function scx_post_fork
• function scx_can_stop_tick
• function scx_rq_activate
• function task_on_scx
• function scx_allow_ttwu_queue
• function init_sched_ext_class
• function scx_update_idle
• function scx_update_idle
• function scx_tg_init
• function scx_tg_offline
• function scx_cgroup_move_task

Annotated Snippet

static inline void scx_tick(struct rq *rq) {}
static inline void scx_pre_fork(struct task_struct *p) {}
static inline int scx_fork(struct task_struct *p, struct kernel_clone_args *kargs) { return 0; }
static inline void scx_post_fork(struct task_struct *p) {}
static inline void scx_cancel_fork(struct task_struct *p) {}
static inline u32 scx_cpuperf_target(s32 cpu) { return 0; }
static inline bool scx_can_stop_tick(struct rq *rq) { return true; }
static inline void scx_rq_activate(struct rq *rq) {}
static inline void scx_rq_deactivate(struct rq *rq) {}
static inline int scx_check_setscheduler(struct task_struct *p, int policy) { return 0; }
static inline bool task_on_scx(const struct task_struct *p) { return false; }
static inline bool scx_allow_ttwu_queue(const struct task_struct *p) { return true; }
static inline void init_sched_ext_class(void) {}

#endif	/* CONFIG_SCHED_CLASS_EXT */

#ifdef CONFIG_SCHED_CLASS_EXT
void __scx_update_idle(struct rq *rq, bool idle, bool do_notify);

static inline void scx_update_idle(struct rq *rq, bool idle, bool do_notify)
{
	if (scx_enabled())
		__scx_update_idle(rq, idle, do_notify);
}
#else
static inline void scx_update_idle(struct rq *rq, bool idle, bool do_notify) {}
#endif

#ifdef CONFIG_CGROUP_SCHED
#ifdef CONFIG_EXT_GROUP_SCHED
void scx_tg_init(struct task_group *tg);
int scx_tg_online(struct task_group *tg);
void scx_tg_offline(struct task_group *tg);
int scx_cgroup_can_attach(struct cgroup_taskset *tset);
void scx_cgroup_move_task(struct task_struct *p);
void scx_cgroup_cancel_attach(struct cgroup_taskset *tset);
void scx_group_set_weight(struct task_group *tg, unsigned long cgrp_weight);
void scx_group_set_idle(struct task_group *tg, bool idle);
void scx_group_set_bandwidth(struct task_group *tg, u64 period_us, u64 quota_us, u64 burst_us);
#else	/* CONFIG_EXT_GROUP_SCHED */
static inline void scx_tg_init(struct task_group *tg) {}
static inline int scx_tg_online(struct task_group *tg) { return 0; }
static inline void scx_tg_offline(struct task_group *tg) {}
static inline int scx_cgroup_can_attach(struct cgroup_taskset *tset) { return 0; }
static inline void scx_cgroup_move_task(struct task_struct *p) {}
static inline void scx_cgroup_cancel_attach(struct cgroup_taskset *tset) {}
static inline void scx_group_set_weight(struct task_group *tg, unsigned long cgrp_weight) {}
static inline void scx_group_set_idle(struct task_group *tg, bool idle) {}
static inline void scx_group_set_bandwidth(struct task_group *tg, u64 period_us, u64 quota_us, u64 burst_us) {}
#endif	/* CONFIG_EXT_GROUP_SCHED */
#endif	/* CONFIG_CGROUP_SCHED */

Annotation

• Detected declarations: `function scx_cpuperf_target`, `function task_on_scx`, `function scx_tick`, `function scx_post_fork`, `function scx_can_stop_tick`, `function scx_rq_activate`, `function task_on_scx`, `function scx_allow_ttwu_queue`, `function init_sched_ext_class`, `function scx_update_idle`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.