Google Git Google Git
Sign in
zircon-guest/third_party/linux/refs/heads/linux-7.3.y/./kernel/sched/sched.h
blob: 4c25fbe84fb54142b267fbc82044ca75f86c27ad [file] [edit]
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Scheduler internal types and methods:
*/
#ifndef _KERNEL_SCHED_SCHED_H
#define _KERNEL_SCHED_SCHED_H
#include <linux/prandom.h>
#include <linux/sched/affinity.h>
#include <linux/sched/autogroup.h>
#include <linux/sched/cpufreq.h>
#include <linux/sched/deadline.h>
#include <linux/sched.h>
#include <linux/sched/loadavg.h>
#include <linux/sched/mm.h>
#include <linux/sched/rseq_api.h>
#include <linux/sched/signal.h>
#include <linux/sched/smt.h>
#include <linux/sched/stat.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/task_flags.h>
#include <linux/sched/task.h>
#include <linux/sched/topology.h>
#include <linux/atomic.h>
#include <linux/bitmap.h>
#include <linux/bug.h>
#include <linux/capability.h>
#include <linux/cgroup_api.h>
#include <linux/cgroup.h>
#include <linux/context_tracking.h>
#include <linux/cpufreq.h>
#include <linux/cpumask_api.h>
#include <linux/cpuset.h>
#include <linux/ctype.h>
#include <linux/file.h>
#include <linux/fs_api.h>
#include <linux/hrtimer_api.h>
#include <linux/interrupt.h>
#include <linux/irq_work.h>
#include <linux/jiffies.h>
#include <linux/kref_api.h>
#include <linux/kthread.h>
#include <linux/ktime_api.h>
#include <linux/lockdep_api.h>
#include <linux/lockdep.h>
#include <linux/memblock.h>
#include <linux/memcontrol.h>
#include <linux/minmax.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex_api.h>
#include <linux/plist.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/profile.h>
#include <linux/psi.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/seqlock.h>
#include <linux/softirq.h>
#include <linux/spinlock_api.h>
#include <linux/static_key.h>
#include <linux/stop_machine.h>
#include <linux/syscalls_api.h>
#include <linux/syscalls.h>
#include <linux/tick.h>
#include <linux/topology.h>
#include <linux/types.h>
#include <linux/u64_stats_sync_api.h>
#include <linux/uaccess.h>
#include <linux/vmstat.h>
#include <linux/wait_api.h>
#include <linux/wait_bit.h>
#include <linux/workqueue_api.h>
#include <linux/delayacct.h>
#include <linux/mmu_context.h>
#include <trace/events/power.h>
#include <trace/events/sched.h>
#include "../workqueue_internal.h"
struct rq;
struct cfs_rq;
struct rt_rq;
struct sched_group;
struct cpuidle_state;
#if defined(CONFIG_PARAVIRT) && !defined(CONFIG_HAVE_PV_STEAL_CLOCK_GEN)
# include <asm/paravirt.h>
#endif
#include <asm/barrier.h>
#include "cpupri.h"
#include "cpudeadline.h"
/* task_struct::on_rq states: */
#define TASK_ON_RQ_QUEUED 1
#define TASK_ON_RQ_MIGRATING 2
extern __read_mostly int scheduler_running;
extern unsigned long calc_load_update;
extern atomic_long_t calc_load_tasks;
extern void calc_global_load_tick(struct rq *this_rq);
extern long calc_load_fold_active(struct rq *this_rq, long adjust);
extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
extern int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
extern int sched_rr_timeslice;
/*
* Asymmetric CPU capacity bits
*/
struct asym_cap_data {
struct list_head link;
struct rcu_head rcu;
unsigned long capacity;
unsigned long cpus[];
};
extern struct list_head asym_cap_list;
#define cpu_capacity_span(asym_data) to_cpumask((asym_data)->cpus)
/*
* Helpers for converting nanosecond timing to jiffy resolution
*/
#define NS_TO_JIFFIES(time) ((unsigned long)(time) / (NSEC_PER_SEC/HZ))
/*
* Increase resolution of nice-level calculations for 64-bit architectures.
* The extra resolution improves shares distribution and load balancing of
* low-weight task groups (eg. nice +19 on an autogroup), deeper task-group
* hierarchies, especially on larger systems. This is not a user-visible change
* and does not change the user-interface for setting shares/weights.
*
* We increase resolution only if we have enough bits to allow this increased
* resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit
* are pretty high and the returns do not justify the increased costs.
*
* Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to
* increase coverage and consistency always enable it on 64-bit platforms.
*/
#ifdef CONFIG_64BIT
# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT)
# define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT)
# define scale_load_down(w) \
({ \
unsigned long __w = (w); \
\
if (__w) \
__w = max(2UL, __w >> SCHED_FIXEDPOINT_SHIFT); \
__w; \
})
#else
# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT)
# define scale_load(w) (w)
# define scale_load_down(w) (w)
#endif
/*
* Task weight (visible to users) and its load (invisible to users) have
* independent resolution, but they should be well calibrated. We use
* scale_load() and scale_load_down(w) to convert between them. The
* following must be true:
*
* scale_load(sched_prio_to_weight[NICE_TO_PRIO(0)-MAX_RT_PRIO]) == NICE_0_LOAD
*
*/
#define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT)
/*
* Single value that decides SCHED_DEADLINE internal math precision.
* 10 -> just above 1us
* 9 -> just above 0.5us
*/
#define DL_SCALE 10
/*
* Single value that denotes runtime == period, ie unlimited time.
*/
#define RUNTIME_INF ((u64)~0ULL)
static inline int idle_policy(int policy)
{
return policy == SCHED_IDLE;
}
static inline int normal_policy(int policy)
{
#ifdef CONFIG_SCHED_CLASS_EXT
if (policy == SCHED_EXT)
return true;
#endif
return policy == SCHED_NORMAL;
}
static inline int fair_policy(int policy)
{
return normal_policy(policy) || policy == SCHED_BATCH;
}
static inline int rt_policy(int policy)
{
return policy == SCHED_FIFO || policy == SCHED_RR;
}
static inline int dl_policy(int policy)
{
return policy == SCHED_DEADLINE;
}
static inline bool valid_policy(int policy)
{
return idle_policy(policy) || fair_policy(policy) ||
rt_policy(policy) || dl_policy(policy);
}
static inline int task_has_idle_policy(struct task_struct *p)
{
return idle_policy(p->policy);
}
static inline int task_has_rt_policy(struct task_struct *p)
{
return rt_policy(p->policy);
}
static inline int task_has_dl_policy(struct task_struct *p)
{
return dl_policy(p->policy);
}
#define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT)
static inline void update_avg(u64 *avg, u64 sample)
{
s64 diff = sample - *avg;
*avg += diff / 8;
}
/*
* Shifting a value by an exponent greater *or equal* to the size of said value
* is UB; cap at size-1.
*/
#define shr_bound(val, shift) \
(val >> min_t(typeof(shift), shift, BITS_PER_TYPE(typeof(val)) - 1))
/*
* cgroup weight knobs should use the common MIN, DFL and MAX values which are
* 1, 100 and 10000 respectively. While it loses a bit of range on both ends, it
* maps pretty well onto the shares value used by scheduler and the round-trip
* conversions preserve the original value over the entire range.
*/
static inline unsigned long sched_weight_from_cgroup(unsigned long cgrp_weight)
{
return DIV_ROUND_CLOSEST_ULL(cgrp_weight * 1024, CGROUP_WEIGHT_DFL);
}
static inline unsigned long sched_weight_to_cgroup(unsigned long weight)
{
return clamp_t(unsigned long,
DIV_ROUND_CLOSEST_ULL(weight * CGROUP_WEIGHT_DFL, 1024),
CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
}
/*
* !! For sched_setattr_nocheck() (kernel) only !!
*
* This is actually gross. :(
*
* It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE
* tasks, but still be able to sleep. We need this on platforms that cannot
* atomically change clock frequency. Remove once fast switching will be
* available on such platforms.
*
* SUGOV stands for SchedUtil GOVernor.
*/
#define SCHED_FLAG_SUGOV 0x10000000
#define SCHED_DL_FLAGS (SCHED_FLAG_RECLAIM | SCHED_FLAG_DL_OVERRUN | SCHED_FLAG_SUGOV)
static inline bool dl_entity_is_special(const struct sched_dl_entity *dl_se)
{
#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
return unlikely(dl_se->flags & SCHED_FLAG_SUGOV);
#else
return false;
#endif
}
/*
* Tells if entity @a should preempt entity @b.
*/
static inline bool dl_entity_preempt(const struct sched_dl_entity *a,
const struct sched_dl_entity *b)
{
return dl_entity_is_special(a) ||
dl_time_before(a->deadline, b->deadline);
}
/*
* This is the priority-queue data structure of the RT scheduling class:
*/
struct rt_prio_array {
DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
struct list_head queue[MAX_RT_PRIO];
};
struct rt_bandwidth {
/* nests inside the rq lock: */
raw_spinlock_t rt_runtime_lock;
ktime_t rt_period;
u64 rt_runtime;
struct hrtimer rt_period_timer;
unsigned int rt_period_active;
};
static inline int dl_bandwidth_enabled(void)
{
return sysctl_sched_rt_runtime >= 0;
}
/*
* To keep the bandwidth of -deadline tasks under control
* we need some place where:
* - store the maximum -deadline bandwidth of each cpu;
* - cache the fraction of bandwidth that is currently allocated in
* each root domain;
*
* This is all done in the data structure below. It is similar to the
* one used for RT-throttling (rt_bandwidth), with the main difference
* that, since here we are only interested in admission control, we
* do not decrease any runtime while the group "executes", neither we
* need a timer to replenish it.
*
* With respect to SMP, bandwidth is given on a per root domain basis,
* meaning that:
* - bw (< 100%) is the deadline bandwidth of each CPU;
* - total_bw is the currently allocated bandwidth in each root domain;
*/
struct dl_bw {
raw_spinlock_t lock;
u64 bw;
u64 total_bw;
};
extern void init_dl_bw(struct dl_bw *dl_b);
extern int sched_dl_global_validate(void);
extern void sched_dl_do_global(void);
extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr);
extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr);
extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr, unsigned int flags);
extern bool __checkparam_dl(const struct sched_attr *attr);
extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr);
extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
extern int dl_bw_deactivate(int cpu);
extern s64 dl_scaled_delta_exec(struct rq *rq, struct sched_dl_entity *dl_se, s64 delta_exec);
/*
* SCHED_DEADLINE supports servers (nested scheduling) with the following
* interface:
*
* dl_se::rq -- runqueue we belong to.
*
* dl_se::server_pick() -- nested pick_next_task(); we yield the period if this
* returns NULL.
*
* dl_server_update() -- called from update_curr_common(), propagates runtime
* to the server.
*
* dl_server_start() -- start the server when it has tasks; it will stop
* automatically when there are no more tasks, per
* dl_se::server_pick() returning NULL.
*
* dl_server_stop() -- (force) stop the server; use when updating
* parameters.
*
* dl_server_init() -- initializes the server.
*
* When started the dl_server will (per dl_defer) schedule a timer for its
* zero-laxity point -- that is, unlike regular EDF tasks which run ASAP, a
* server will run at the very end of its period.
*
* This is done such that any runtime from the target class can be accounted
* against the server -- through dl_server_update() above -- such that when it
* becomes time to run, it might already be out of runtime and get deferred
* until the next period. In this case dl_server_timer() will alternate
* between defer and replenish but never actually enqueue the server.
*
* Only when the target class does not manage to exhaust the server's runtime
* (there's actualy starvation in the given period), will the dl_server get on
* the runqueue. Once queued it will pick tasks from the target class and run
* them until either its runtime is exhaused, at which point its back to
* dl_server_timer, or until there are no more tasks to run, at which point
* the dl_server stops itself.
*
* By stopping at this point the dl_server retains bandwidth, which, if a new
* task wakes up imminently (starting the server again), can be used --
* subject to CBS wakeup rules -- without having to wait for the next period.
*
* Additionally, because of the dl_defer behaviour the start/stop behaviour is
* naturally thottled to once per period, avoiding high context switch
* workloads from spamming the hrtimer program/cancel paths.
*/
extern void dl_server_update_idle(struct sched_dl_entity *dl_se, s64 delta_exec);
extern void dl_server_update(struct sched_dl_entity *dl_se, s64 delta_exec);
extern void dl_server_start(struct sched_dl_entity *dl_se);
extern void dl_server_stop(struct sched_dl_entity *dl_se);
extern void dl_server_init(struct sched_dl_entity *dl_se, struct rq *rq,
dl_server_pick_f pick_task);
extern void sched_init_dl_servers(void);
extern void fair_server_init(struct rq *rq);
extern void ext_server_init(struct rq *rq);
extern void __dl_server_attach_root(struct sched_dl_entity *dl_se, struct rq *rq);
extern int dl_server_apply_params(struct sched_dl_entity *dl_se,
u64 runtime, u64 period, bool init);
extern int dl_server_attach_bw(struct sched_dl_entity *dl_se);
extern void dl_server_detach_bw(struct sched_dl_entity *dl_se);
extern int dl_server_swap_bw(struct sched_dl_entity *detach_se,
struct sched_dl_entity *attach_se);
static inline bool dl_server_active(struct sched_dl_entity *dl_se)
{
return dl_se->dl_server_active;
}
#ifdef CONFIG_CGROUP_SCHED
extern struct list_head task_groups;
#ifdef CONFIG_GROUP_SCHED_BANDWIDTH
extern const u64 max_bw_quota_period_us;
/*
* default period for group bandwidth.
* default: 0.1s, units: microseconds
*/
static inline u64 default_bw_period_us(void)
{
return 100000ULL;
}
#endif /* CONFIG_GROUP_SCHED_BANDWIDTH */
struct cfs_bandwidth {
#ifdef CONFIG_CFS_BANDWIDTH
raw_spinlock_t lock;
ktime_t period;
u64 quota;
u64 runtime;
u64 burst;
u64 runtime_snap;
s64 hierarchical_quota;
u8 idle;
u8 period_active;
u8 slack_started;
struct hrtimer period_timer;
struct hrtimer slack_timer;
struct list_head throttled_cfs_rq;
/* Statistics: */
int nr_periods;
int nr_throttled;
int nr_burst;
u64 throttled_time;
u64 burst_time;
#endif /* CONFIG_CFS_BANDWIDTH */
};
/* Task group related information */
struct task_group {
struct cgroup_subsys_state css;
#ifdef CONFIG_GROUP_SCHED_WEIGHT
/* A positive value indicates that this is a SCHED_IDLE group. */
int idle;
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
/* runqueue "owned" by this group on each CPU */
struct cfs_rq __percpu *cfs_rq;
unsigned long shares;
/*
* load_avg can be heavily contended at clock tick time, so put
* it in its own cache-line separated from the fields above which
* will also be accessed at each tick.
*/
atomic_long_t load_avg ____cacheline_aligned;
atomic_long_t runnable_avg;
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_RT_GROUP_SCHED
struct sched_rt_entity **rt_se;
struct rt_rq **rt_rq;
struct rt_bandwidth rt_bandwidth;
#endif
struct scx_task_group scx;
struct rcu_head rcu;
struct list_head list;
struct task_group *parent;
struct list_head siblings;
struct list_head children;
#ifdef CONFIG_SCHED_AUTOGROUP
struct autogroup *autogroup;
#endif
struct cfs_bandwidth cfs_bandwidth;
#ifdef CONFIG_UCLAMP_TASK_GROUP
/* The two decimal precision [%] value requested from user-space */
unsigned int uclamp_pct[UCLAMP_CNT];
/* Clamp values requested for a task group */
struct uclamp_se uclamp_req[UCLAMP_CNT];
/* Effective clamp values used for a task group */
struct uclamp_se uclamp[UCLAMP_CNT];
#endif
};
#define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
typedef int (*tg_visitor)(struct task_group *, void *);
extern int walk_tg_tree_from(struct task_group *from,
tg_visitor down, tg_visitor up, void *data);
/*
* Iterate the full tree, calling @down when first entering a node and @up when
* leaving it for the final time.
*
* Caller must hold rcu_lock or sufficient equivalent.
*/
static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
{
return walk_tg_tree_from(&root_task_group, down, up, data);
}
static inline struct task_group *css_tg(struct cgroup_subsys_state *css)
{
return css ? container_of(css, struct task_group, css) : NULL;
}
extern int tg_nop(struct task_group *tg, void *data);
#ifdef CONFIG_FAIR_GROUP_SCHED
extern void free_fair_sched_group(struct task_group *tg);
extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
extern void online_fair_sched_group(struct task_group *tg);
extern void unregister_fair_sched_group(struct task_group *tg);
extern void __sched_cgroup_mode_update(int mode);
#else /* !CONFIG_FAIR_GROUP_SCHED: */
static inline void free_fair_sched_group(struct task_group *tg) { }
static inline int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
{
return 1;
}
static inline void online_fair_sched_group(struct task_group *tg) { }
static inline void unregister_fair_sched_group(struct task_group *tg) { }
#endif /* !CONFIG_FAIR_GROUP_SCHED */
extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
struct sched_entity *se, int cpu,
struct sched_entity *parent);
extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b, struct cfs_bandwidth *parent);
extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
extern bool cfs_task_bw_constrained(struct task_struct *p);
extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
struct sched_rt_entity *rt_se, int cpu,
struct sched_rt_entity *parent);
extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
extern long sched_group_rt_runtime(struct task_group *tg);
extern long sched_group_rt_period(struct task_group *tg);
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
extern struct task_group *sched_create_group(struct task_group *parent);
extern void sched_online_group(struct task_group *tg,
struct task_group *parent);
extern void sched_destroy_group(struct task_group *tg);
extern void sched_release_group(struct task_group *tg);
extern void sched_move_task(struct task_struct *tsk, bool for_autogroup);
#ifdef CONFIG_FAIR_GROUP_SCHED
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
extern int sched_group_set_idle(struct task_group *tg, long idle);
extern void set_task_rq_fair(struct sched_entity *se,
struct cfs_rq *prev, struct cfs_rq *next);
#else /* !CONFIG_FAIR_GROUP_SCHED: */
static inline int sched_group_set_shares(struct task_group *tg, unsigned long shares) { return 0; }
static inline int sched_group_set_idle(struct task_group *tg, long idle) { return 0; }
#endif /* !CONFIG_FAIR_GROUP_SCHED */
#else /* !CONFIG_CGROUP_SCHED: */
struct cfs_bandwidth { };
static inline bool cfs_task_bw_constrained(struct task_struct *p) { return false; }
#endif /* !CONFIG_CGROUP_SCHED */
/*
* A weight of 0 or 1 can cause arithmetics problems.
* A weight of a cfs_rq is the sum of weights of which entities
* are queued on this cfs_rq, so a weight of a entity should not be
* too large, so as the shares value of a task group.
* (The default weight is 1024 - so there's no practical
* limitation from this.)
*/
#define MIN_SHARES (1UL << 1)
#define MAX_SHARES (1UL << 18)
extern void unregister_rt_sched_group(struct task_group *tg);
extern void free_rt_sched_group(struct task_group *tg);
extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
/*
* u64_u32_load/u64_u32_store
*
* Use a copy of a u64 value to protect against data race. This is only
* applicable for 32-bits architectures.
*/
#ifdef CONFIG_64BIT
# define u64_u32_load_copy(var, copy) var
# define u64_u32_store_copy(var, copy, val) (var = val)
#else
# define u64_u32_load_copy(var, copy) \
({ \
u64 __val, __val_copy; \
do { \
__val_copy = copy; \
/* \
* paired with u64_u32_store_copy(), ordering access \
* to var and copy. \
*/ \
smp_rmb(); \
__val = var; \
} while (__val != __val_copy); \
__val; \
})
# define u64_u32_store_copy(var, copy, val) \
do { \
typeof(val) __val = (val); \
var = __val; \
/* \
* paired with u64_u32_load_copy(), ordering access to var and \
* copy. \
*/ \
smp_wmb(); \
copy = __val; \
} while (0)
#endif
# define u64_u32_load(var) u64_u32_load_copy(var, var##_copy)
# define u64_u32_store(var, val) u64_u32_store_copy(var, var##_copy, val)
struct balance_callback {
struct balance_callback *next;
void (*func)(struct rq *rq);
};
/* Fair scheduling SCHED_{NORMAL,BATCH,IDLE} related fields in a runqueue: */
struct cfs_rq {
struct load_weight load;
unsigned int nr_queued;
unsigned int h_nr_queued; /* SCHED_{NORMAL,BATCH,IDLE} */
unsigned int h_nr_runnable; /* SCHED_{NORMAL,BATCH,IDLE} */
unsigned int h_nr_idle; /* SCHED_IDLE */
s64 sum_w_vruntime;
u64 sum_weight;
u64 zero_vruntime;
unsigned int sum_shift;
#ifdef CONFIG_SCHED_CORE
unsigned int forceidle_seq;
u64 zero_vruntime_fi;
#endif
struct rb_root_cached tasks_timeline;
/*
* 'curr' points to the currently running entity on this cfs_rq.
* It is set to NULL otherwise (i.e when none are currently running).
*/
struct sched_entity *curr;
struct sched_entity *next;
/*
* CFS load tracking
*/
struct sched_entity *h_curr;
struct sched_avg avg;
#ifndef CONFIG_64BIT
u64 last_update_time_copy;
#endif
struct {
raw_spinlock_t lock ____cacheline_aligned;
int nr;
unsigned long load_avg;
unsigned long util_avg;
unsigned long runnable_avg;
} removed;
#ifdef CONFIG_FAIR_GROUP_SCHED
u64 last_update_tg_load_avg;
unsigned long tg_load_avg_contrib;
unsigned long tg_runnable_avg_contrib;
long propagate;
long prop_runnable_sum;
/*
* h_load = weight * f(tg)
*
* Where f(tg) is the recursive weight fraction assigned to
* this group.
*/
unsigned long h_load;
u64 last_h_load_update;
struct sched_entity *h_load_next;
struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */
/*
* leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
* a hierarchy). Non-leaf lrqs hold other higher schedulable entities
* (like users, containers etc.)
*
* leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU.
* This list is used during load balance.
*/
int on_list;
struct list_head leaf_cfs_rq_list;
struct task_group *tg; /* Group that "owns" this runqueue */
/* Locally cached copy of our task_group's idle value */
int idle;
# ifdef CONFIG_CFS_BANDWIDTH
int runtime_enabled;
s64 runtime_remaining;
u64 throttled_pelt_idle;
# ifndef CONFIG_64BIT
u64 throttled_pelt_idle_copy;
# endif
u64 throttled_clock;
u64 throttled_clock_pelt;
u64 throttled_clock_pelt_time;
u64 throttled_clock_self;
u64 throttled_clock_self_time;
bool throttled:1;
bool pelt_clock_throttled:1;
int throttle_count;
struct list_head throttled_list;
struct list_head throttled_csd_list;
struct list_head throttled_limbo_list;
# endif /* CONFIG_CFS_BANDWIDTH */
#endif /* CONFIG_FAIR_GROUP_SCHED */
};
#ifdef CONFIG_SCHED_CLASS_EXT
/* scx_rq->flags, protected by the rq lock */
enum scx_rq_flags {
/*
* A hotplugged CPU starts scheduling before rq_online_scx(). Track
* ops.cpu_on/offline() state so that ops.enqueue/dispatch() are called
* only while the BPF scheduler considers the CPU to be online.
*/
SCX_RQ_ONLINE = 1 << 0,
SCX_RQ_CAN_STOP_TICK = 1 << 1,
SCX_RQ_CLK_VALID = 1 << 5, /* RQ clock is fresh and valid */
SCX_RQ_BAL_CB_PENDING = 1 << 6, /* must queue a cb after dispatching */
SCX_RQ_SUB_IDLE_RENOTIFY = 1 << 7, /* sub-scheds are owed update_idle() */
SCX_RQ_ROOT_IDLE_RENOTIFY = 1 << 8, /* the root is owed update_idle() */
SCX_RQ_IN_WAKEUP = 1 << 16,
SCX_RQ_IN_DISPATCH = 1 << 17,
};
/* per-rq rescue execution state, see scx_rescue_timerfn() */
struct scx_rq_rescue {
struct scx_dispatch_q dsq; /* stranded tasks awaiting rescue */
s64 budget; /* execution token bucket, ns */
u64 clock; /* last budget accrual timestamp */
struct task_struct *curr; /* task being rescued, one at a time */
s64 slice; /* curr's admitted slice */
u64 exec_snap; /* sum_exec_runtime at admission */
struct timer_list timer; /* paces admission and escalation */
u64 kill_at; /* last ejection, init before any */
};
struct scx_rq {
struct scx_dispatch_q local_dsq;
#ifdef CONFIG_EXT_SUB_SCHED
struct scx_dispatch_q reject_dsq; /* staging for cap-rejected tasks */
struct scx_rq_rescue rescue;
#endif
struct list_head runnable_list; /* runnable tasks on this rq */
struct list_head ddsp_deferred_locals; /* deferred ddsps from enq */
/* both stashed across the activate_task() in move_remote_task_to_local_dsq() */
u64 remote_activate_enq_flags;
struct scx_sched *remote_activate_sch;
u32 nr_running;
u32 cpuperf_target; /* [0, SCHED_CAPACITY_SCALE] */
bool in_select_cpu;
bool cpu_released;
u32 flags;
u32 nr_immed; /* ENQ_IMMED tasks on local_dsq */
#ifdef CONFIG_SCHED_CORE
u32 lock_drop_seq; /* nr dispatch lock releases */
#endif
u64 clock; /* current per-rq clock -- see scx_bpf_now() */
#ifdef CONFIG_EXT_SUB_SCHED
struct llist_head ecaps_to_sync; /* pending ecaps syncs */
struct task_struct *sub_dispatch_prev;
#endif
cpumask_var_t cpus_to_sync;
bool kick_sync_pending;
unsigned long kick_sync;
struct list_head sched_pcpus_to_kick; /* see kick_cpus_irq_workfn() */
raw_spinlock_t deferred_reenq_lock;
struct list_head deferred_reenq_locals; /* scheds requesting reenq of local DSQ */
struct list_head deferred_reenq_users; /* user DSQs requesting reenq */
struct balance_callback deferred_bal_cb;
struct balance_callback kick_sync_bal_cb;
struct irq_work deferred_irq_work;
struct irq_work kick_cpus_irq_work;
};
#endif /* CONFIG_SCHED_CLASS_EXT */
static inline int rt_bandwidth_enabled(void)
{
return sysctl_sched_rt_runtime >= 0;
}
/* RT IPI pull logic requires IRQ_WORK */
#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP)
# define HAVE_RT_PUSH_IPI
#endif
/* Real-Time classes' related field in a runqueue: */
struct rt_rq {
struct rt_prio_array active;
unsigned int rt_nr_running;
unsigned int rr_nr_running;
struct {
int curr; /* highest queued rt task prio */
int next; /* next highest */
} highest_prio;
bool overloaded;
struct plist_head pushable_tasks;
int rt_queued;
#ifdef CONFIG_RT_GROUP_SCHED
int rt_throttled;
u64 rt_time; /* consumed RT time, goes up in update_curr_rt */
u64 rt_runtime; /* allotted RT time, "slice" from rt_bandwidth, RT sharing/balancing */
/* Nests inside the rq lock: */
raw_spinlock_t rt_runtime_lock;
unsigned int rt_nr_boosted;
struct rq *rq; /* this is always top-level rq, cache? */
#endif
#ifdef CONFIG_CGROUP_SCHED
struct task_group *tg; /* this tg has "this" rt_rq on given CPU for runnable entities */
#endif
};
static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq)
{
return rt_rq->rt_queued && rt_rq->rt_nr_running;
}
/* Deadline class' related fields in a runqueue */
struct dl_rq {
/* runqueue is an rbtree, ordered by deadline */
struct rb_root_cached root;
unsigned int dl_nr_running;
/*
* Deadline values of the currently executing and the
* earliest ready task on this rq. Caching these facilitates
* the decision whether or not a ready but not running task
* should migrate somewhere else.
*/
struct {
u64 curr;
u64 next;
} earliest_dl;
bool overloaded;
struct sched_dl_entity *curr;
/*
* Tasks on this rq that can be pushed away. They are kept in
* an rb-tree, ordered by tasks' deadlines, with caching
* of the leftmost (earliest deadline) element.
*/
struct rb_root_cached pushable_dl_tasks_root;
/*
* "Active utilization" for this runqueue: increased when a
* task wakes up (becomes TASK_RUNNING) and decreased when a
* task blocks
*/
u64 running_bw;
/*
* Utilization of the tasks "assigned" to this runqueue (including
* the tasks that are in runqueue and the tasks that executed on this
* CPU and blocked). Increased when a task moves to this runqueue, and
* decreased when the task moves away (migrates, changes scheduling
* policy, or terminates).
* This is needed to compute the "inactive utilization" for the
* runqueue (inactive utilization = this_bw - running_bw).
*/
u64 this_bw;
u64 extra_bw;
/*
* Maximum available bandwidth for reclaiming by SCHED_FLAG_RECLAIM
* tasks of this rq. Used in calculation of reclaimable bandwidth(GRUB).
*/
u64 max_bw;
/*
* Inverse of the fraction of CPU utilization that can be reclaimed
* by the GRUB algorithm.
*/
u64 bw_ratio;
};
#ifdef CONFIG_FAIR_GROUP_SCHED
/* Check whether a task group is root tg */
#define is_root_task_group(tg) ((tg) == &root_task_group)
/* An entity is a task if it doesn't "own" a runqueue */
#define entity_is_task(se) (!se->my_q)
static inline void se_update_runnable(struct sched_entity *se)
{
if (!entity_is_task(se))
se->runnable_weight = se->my_q->h_nr_runnable;
}
static inline long se_runnable(struct sched_entity *se)
{
if (se->sched_delayed)
return false;
if (entity_is_task(se))
return !!se->on_rq;
else
return se->runnable_weight;
}
#else /* !CONFIG_FAIR_GROUP_SCHED: */
#define entity_is_task(se) 1
static inline void se_update_runnable(struct sched_entity *se) { }
static inline long se_runnable(struct sched_entity *se)
{
if (se->sched_delayed)
return false;
return !!se->on_rq;
}
#endif /* !CONFIG_FAIR_GROUP_SCHED */
/*
* XXX we want to get rid of these helpers and use the full load resolution.
*/
static inline long se_weight(struct sched_entity *se)
{
return scale_load_down(se->load.weight);
}
static inline bool sched_asym_prefer(int a, int b)
{
return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b);
}
struct perf_domain {
struct em_perf_domain *em_pd;
struct perf_domain *next;
struct rcu_head rcu;
};
/*
* We add the notion of a root-domain which will be used to define per-domain
* variables. Each exclusive cpuset essentially defines an island domain by
* fully partitioning the member CPUs from any other cpuset. Whenever a new
* exclusive cpuset is created, we also create and attach a new root-domain
* object.
*
*/
struct root_domain {
atomic_t refcount;
atomic_t rto_count;
struct rcu_head rcu;
cpumask_var_t span;
cpumask_var_t online;
/*
* Indicate pullable load on at least one CPU, e.g:
* - More than one runnable task
* - Running task is misfit
*/
bool overloaded;
/* Indicate one or more CPUs over-utilized (tipping point) */
bool overutilized;
/*
* The bit corresponding to a CPU gets set here if such CPU has more
* than one runnable -deadline task (as it is below for RT tasks).
*/
cpumask_var_t dlo_mask;
atomic_t dlo_count;
struct dl_bw dl_bw;
struct cpudl cpudl;
/*
* Indicate whether a root_domain's dl_bw has been checked or
* updated. It's monotonously increasing value.
*
* Also, some corner cases, like 'wrap around' is dangerous, but given
* that u64 is 'big enough'. So that shouldn't be a concern.
*/
u64 visit_cookie;
#ifdef HAVE_RT_PUSH_IPI
/*
* For IPI pull requests, loop across the rto_mask.
*/
struct irq_work rto_push_work;
raw_spinlock_t rto_lock;
/* These are only updated and read within rto_lock */
int rto_loop;
int rto_cpu;
/* These atomics are updated outside of a lock */
atomic_t rto_loop_next;
atomic_t rto_loop_start;
#endif /* HAVE_RT_PUSH_IPI */
/*
* The "RT overload" flag: it gets set if a CPU has more than
* one runnable RT task.
*/
cpumask_var_t rto_mask;
struct cpupri cpupri;
/*
* NULL-terminated list of performance domains intersecting with the
* CPUs of the rd. Protected by RCU.
*/
struct perf_domain __rcu *pd;
};
extern void init_defrootdomain(void);
extern int sched_init_domains(const struct cpumask *cpu_map);
extern void rq_attach_root(struct rq *rq, struct root_domain *rd);
extern void sched_get_rd(struct root_domain *rd);
extern void sched_put_rd(struct root_domain *rd);
static inline int get_rd_overloaded(struct root_domain *rd)
{
return READ_ONCE(rd->overloaded);
}
static inline void set_rd_overloaded(struct root_domain *rd, int status)
{
if (get_rd_overloaded(rd) != status)
WRITE_ONCE(rd->overloaded, status);
}
#ifdef HAVE_RT_PUSH_IPI
extern void rto_push_irq_work_func(struct irq_work *work);
#endif
#ifdef CONFIG_UCLAMP_TASK
/*
* struct uclamp_bucket - Utilization clamp bucket
* @value: utilization clamp value for tasks on this clamp bucket
* @tasks: number of RUNNABLE tasks on this clamp bucket
*
* Keep track of how many tasks are RUNNABLE for a given utilization
* clamp value.
*/
struct uclamp_bucket {
unsigned long value : bits_per(SCHED_CAPACITY_SCALE);
unsigned long tasks : BITS_PER_LONG - bits_per(SCHED_CAPACITY_SCALE);
};
/*
* struct uclamp_rq - rq's utilization clamp
* @value: currently active clamp values for a rq
* @bucket: utilization clamp buckets affecting a rq
*
* Keep track of RUNNABLE tasks on a rq to aggregate their clamp values.
* A clamp value is affecting a rq when there is at least one task RUNNABLE
* (or actually running) with that value.
*
* There are up to UCLAMP_CNT possible different clamp values, currently there
* are only two: minimum utilization and maximum utilization.
*
* All utilization clamping values are MAX aggregated, since:
* - for util_min: we want to run the CPU at least at the max of the minimum
* utilization required by its currently RUNNABLE tasks.
* - for util_max: we want to allow the CPU to run up to the max of the
* maximum utilization allowed by its currently RUNNABLE tasks.
*
* Since on each system we expect only a limited number of different
* utilization clamp values (UCLAMP_BUCKETS), use a simple array to track
* the metrics required to compute all the per-rq utilization clamp values.
*/
struct uclamp_rq {
unsigned int value;
struct uclamp_bucket bucket[UCLAMP_BUCKETS];
};
DECLARE_STATIC_KEY_FALSE(sched_uclamp_used);
#endif /* CONFIG_UCLAMP_TASK */
/*
* This is the main, per-CPU runqueue data structure.
*
* Locking rule: those places that want to lock multiple runqueues
* (such as the load balancing or the thread migration code), lock
* acquire operations must be ordered by ascending &runqueue.
*/
struct rq {
/*
* The following members are loaded together, without holding the
* rq->lock, in an extremely hot loop in update_sg_lb_stats()
* (called from pick_next_task()). To reduce cache pollution from
* this operation, they are placed together on this dedicated cache
* line. Even though some of them are frequently modified, they are
* loaded much more frequently than they are stored.
*/
unsigned int nr_running;
#ifdef CONFIG_NUMA_BALANCING
unsigned int nr_numa_running;
unsigned int nr_preferred_running;
#endif
unsigned int ttwu_pending;
unsigned long cpu_capacity;
#ifdef CONFIG_SCHED_PROXY_EXEC
struct task_struct __rcu *donor; /* Scheduling context */
struct task_struct __rcu *curr; /* Execution context */
#else
union {
struct task_struct __rcu *donor; /* Scheduler context */
struct task_struct __rcu *curr; /* Execution context */
};
#endif
struct task_struct *idle;
/* padding left here deliberately */
/*
* The next cacheline holds the (hot) runqueue lock, as well as
* some other less performance-critical fields.
*/
u64 nr_switches ____cacheline_aligned;
/* runqueue lock: */
raw_spinlock_t __lock;
#ifdef CONFIG_NO_HZ_COMMON
unsigned int nohz_tick_stopped;
atomic_t nohz_flags;
unsigned int has_blocked_load;
unsigned long last_blocked_load_update_tick;
call_single_data_t nohz_csd;
#endif /* CONFIG_NO_HZ_COMMON */
#ifdef CONFIG_UCLAMP_TASK
/* Utilization clamp values based on CPU's RUNNABLE tasks */
struct uclamp_rq uclamp[UCLAMP_CNT] ____cacheline_aligned;
unsigned int uclamp_flags;
#define UCLAMP_FLAG_IDLE 0x01
#endif
struct cfs_rq cfs;
struct rt_rq rt;
struct dl_rq dl;
#ifdef CONFIG_SCHED_CLASS_EXT
struct scx_rq scx;
struct sched_dl_entity ext_server;
#endif
#ifdef CONFIG_SCHED_CACHE
raw_spinlock_t cpu_epoch_lock ____cacheline_aligned;
u64 cpu_runtime;
unsigned long cpu_epoch;
unsigned long cpu_epoch_next;
#endif
struct sched_dl_entity fair_server;
#ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this CPU: */
struct list_head leaf_cfs_rq_list;
struct list_head *tmp_alone_branch;
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_NUMA_BALANCING
unsigned int numa_migrate_on;
#endif
#ifdef CONFIG_SCHED_CACHE
unsigned int nr_pref_llc_running;
unsigned int nr_llc_running;
#endif
/*
* This is part of a global counter where only the total sum
* over all CPUs matters. A task can increase this counter on
* one CPU and if it got migrated afterwards it may decrease
* it on another CPU. Always updated under the runqueue lock:
*/
unsigned long nr_uninterruptible;
struct sched_dl_entity *dl_server;
struct task_struct *stop;
const struct sched_class *next_class;
unsigned long next_balance;
struct mm_struct *prev_mm;
/*
* The following fields of clock data are frequently referenced
* and updated together, and should go on their own cache line.
*/
u64 clock_task ____cacheline_aligned;
u64 clock_pelt;
u64 clock;
unsigned long lost_idle_time;
unsigned int clock_update_flags;
u64 clock_pelt_idle;
u64 clock_idle;
#ifndef CONFIG_64BIT
u64 clock_pelt_idle_copy;
u64 clock_idle_copy;
#endif
u64 last_seen_need_resched_ns;
int ticks_without_resched;
#ifdef CONFIG_MEMBARRIER
int membarrier_state;
#endif
struct root_domain *rd;
struct sched_domain __rcu *sd;
struct balance_callback *balance_callback;
unsigned char nohz_idle_balance;
unsigned char idle_balance;
unsigned long misfit_task_load;
/* For active balancing */
int active_balance;
int push_cpu;
struct cpu_stop_work active_balance_work;
/* CPU of this runqueue: */
int cpu;
int online;
struct list_head cfs_tasks;
struct sched_avg avg_rt;
struct sched_avg avg_dl;
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
struct sched_avg avg_irq;
#endif
#ifdef CONFIG_SCHED_HW_PRESSURE
struct sched_avg avg_hw;
#endif
u64 idle_stamp;
u64 avg_idle;
/* This is used to determine avg_idle's max value */
u64 max_idle_balance_cost;
#ifdef CONFIG_HOTPLUG_CPU
struct rcuwait hotplug_wait;
#endif
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
u64 prev_irq_time;
u64 psi_irq_time;
#endif
#ifdef CONFIG_PARAVIRT
u64 prev_steal_time;
#endif
#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
u64 prev_steal_time_rq;
#endif
/* calc_load related fields */
unsigned long calc_load_update;
long calc_load_active;
#ifdef CONFIG_SCHED_HRTICK
call_single_data_t hrtick_csd;
struct hrtimer hrtick_timer;
ktime_t hrtick_time;
ktime_t hrtick_delay;
unsigned int hrtick_sched;
#endif
#ifdef CONFIG_SCHEDSTATS
/* latency stats */
struct sched_info rq_sched_info;
unsigned long long rq_cpu_time;
/* sys_sched_yield() stats */
unsigned int yld_count;
/* schedule() stats */
unsigned int sched_count;
unsigned int sched_goidle;
/* try_to_wake_up() stats */
unsigned int ttwu_count;
unsigned int ttwu_local;
#endif
#ifdef CONFIG_CPU_IDLE
/* Must be inspected within a RCU lock section */
struct cpuidle_state *idle_state;
#endif
unsigned int nr_pinned;
unsigned int push_busy;
struct cpu_stop_work push_work;
#ifdef CONFIG_SCHED_CORE
/* per rq */
struct rq *core;
struct task_struct *core_pick;
struct sched_dl_entity *core_dl_server;
unsigned int core_enabled;
unsigned int core_sched_seq;
struct rb_root core_tree;
/* shared state -- careful with sched_core_cpu_deactivate() */
unsigned int core_task_seq;
unsigned int core_pick_seq;
unsigned long core_cookie;
unsigned int core_forceidle_count;
unsigned int core_forceidle_seq;
unsigned int core_forceidle_occupation;
u64 core_forceidle_start;
unsigned int core_pick_in_flight;
#endif /* CONFIG_SCHED_CORE */
/* Scratch cpumask to be temporarily used under rq_lock */
cpumask_var_t scratch_mask;
#ifdef CONFIG_CFS_BANDWIDTH
call_single_data_t cfsb_csd;
struct list_head cfsb_csd_list;
#endif
atomic_t nr_iowait;
} __no_randomize_layout;
#ifdef CONFIG_FAIR_GROUP_SCHED
/* CPU runqueue to which this cfs_rq is attached */
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
return cfs_rq->rq;
}
#else /* !CONFIG_FAIR_GROUP_SCHED: */
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
{
return container_of(cfs_rq, struct rq, cfs);
}
#endif /* !CONFIG_FAIR_GROUP_SCHED */
static inline int cpu_of(struct rq *rq)
{
return rq->cpu;
}
#define MDF_PUSH 0x01
static inline bool is_migration_disabled(struct task_struct *p)
{
return p->migration_disabled;
}
DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
DECLARE_PER_CPU(struct rnd_state, sched_rnd_state);
static inline u32 sched_rng(void)
{
return prandom_u32_state(this_cpu_ptr(&sched_rnd_state));
}
static __always_inline struct rq *__this_rq(void)
{
return this_cpu_ptr(&runqueues);
}
#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
#define this_rq() __this_rq()
#define task_rq(p) cpu_rq(task_cpu(p))
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define raw_rq() raw_cpu_ptr(&runqueues)
static inline bool idle_rq(struct rq *rq)
{
return rq->curr == rq->idle && !rq->nr_running && !rq->ttwu_pending;
}
/**
* available_idle_cpu - is a given CPU idle for enqueuing work.
* @cpu: the CPU in question.
*
* Return: 1 if the CPU is currently idle. 0 otherwise.
*/
static inline bool available_idle_cpu(int cpu)
{
if (!idle_rq(cpu_rq(cpu)))
return 0;
if (vcpu_is_preempted(cpu))
return 0;
return 1;
}
#ifdef CONFIG_SCHED_PROXY_EXEC
static inline void rq_set_donor(struct rq *rq, struct task_struct *t)
{
rcu_assign_pointer(rq->donor, t);
}
#else
static inline void rq_set_donor(struct rq *rq, struct task_struct *t)
{
/* Do nothing */
}
#endif
#ifdef CONFIG_SCHED_CORE
static inline struct cpumask *sched_group_span(struct sched_group *sg);
DECLARE_STATIC_KEY_FALSE(__sched_core_enabled);
static inline bool sched_core_enabled(struct rq *rq)
{
return static_branch_unlikely(&__sched_core_enabled) && rq->core_enabled;
}
static inline bool sched_core_disabled(void)
{
return !static_branch_unlikely(&__sched_core_enabled);
}
/*
* Be careful with this function; not for general use. The return value isn't
* stable unless you actually hold a relevant rq->__lock.
*/
static inline raw_spinlock_t *rq_lockp(struct rq *rq)
{
if (sched_core_enabled(rq))
return &rq->core->__lock;
return &rq->__lock;
}
static inline raw_spinlock_t *__rq_lockp(struct rq *rq)
__returns_ctx_lock(rq_lockp(rq)) /* alias them */
{
if (rq->core_enabled)
return &rq->core->__lock;
return &rq->__lock;
}
extern bool
cfs_prio_less(const struct task_struct *a, const struct task_struct *b, bool fi);
extern void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi);
/*
* Helpers to check if the CPU's core cookie matches with the task's cookie
* when core scheduling is enabled.
* A special case is that the task's cookie always matches with CPU's core
* cookie if the CPU is in an idle core.
*/
static inline bool sched_cpu_cookie_match(struct rq *rq, struct task_struct *p)
{
/* Ignore cookie match if core scheduler is not enabled on the CPU. */
if (!sched_core_enabled(rq))
return true;
return rq->core->core_cookie == p->core_cookie;
}
static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p)
{
bool idle_core = true;
int cpu;
/* Ignore cookie match if core scheduler is not enabled on the CPU. */
if (!sched_core_enabled(rq))
return true;
if (rq->core->core_cookie == p->core_cookie)
return true;
for_each_cpu(cpu, cpu_smt_mask(cpu_of(rq))) {
if (!available_idle_cpu(cpu)) {
idle_core = false;
break;
}
}
/*
* A CPU in an idle core is always the best choice for tasks with
* cookies.
*/
return idle_core;
}
static inline bool sched_group_cookie_match(struct rq *rq,
struct task_struct *p,
struct sched_group *group)
{
int cpu;
/* Ignore cookie match if core scheduler is not enabled on the CPU. */
if (!sched_core_enabled(rq))
return true;
for_each_cpu_and(cpu, sched_group_span(group), p->cpus_ptr) {
if (sched_core_cookie_match(cpu_rq(cpu), p))
return true;
}
return false;
}
static inline bool sched_core_enqueued(struct task_struct *p)
{
return !RB_EMPTY_NODE(&p->core_node);
}
extern void sched_core_enqueue(struct rq *rq, struct task_struct *p);
extern void sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags);
extern void sched_core_get(void);
extern void sched_core_put(void);
static inline bool task_has_sched_core(struct task_struct *p)
{
if (sched_core_disabled())
return false;
return !!p->core_cookie;
}
#else /* !CONFIG_SCHED_CORE: */
static inline bool sched_core_enabled(struct rq *rq)
{
return false;
}
static inline bool sched_core_disabled(void)
{
return true;
}
static inline raw_spinlock_t *rq_lockp(struct rq *rq)
{
return &rq->__lock;
}
static inline raw_spinlock_t *__rq_lockp(struct rq *rq)
__returns_ctx_lock(rq_lockp(rq)) /* alias them */
{
return &rq->__lock;
}
static inline bool sched_cpu_cookie_match(struct rq *rq, struct task_struct *p)
{
return true;
}
static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p)
{
return true;
}
static inline bool sched_group_cookie_match(struct rq *rq,
struct task_struct *p,
struct sched_group *group)
{
return true;
}
static inline bool task_has_sched_core(struct task_struct *p)
{
return false;
}
#endif /* !CONFIG_SCHED_CORE */
#ifdef CONFIG_RT_GROUP_SCHED
# ifdef CONFIG_RT_GROUP_SCHED_DEFAULT_DISABLED
DECLARE_STATIC_KEY_FALSE(rt_group_sched);
static inline bool rt_group_sched_enabled(void)
{
return static_branch_unlikely(&rt_group_sched);
}
# else /* !CONFIG_RT_GROUP_SCHED_DEFAULT_DISABLED: */
DECLARE_STATIC_KEY_TRUE(rt_group_sched);
static inline bool rt_group_sched_enabled(void)
{
return static_branch_likely(&rt_group_sched);
}
# endif /* !CONFIG_RT_GROUP_SCHED_DEFAULT_DISABLED */
#else /* !CONFIG_RT_GROUP_SCHED: */
# define rt_group_sched_enabled() false
#endif /* !CONFIG_RT_GROUP_SCHED */
static inline void lockdep_assert_rq_held(struct rq *rq)
__assumes_ctx_lock(__rq_lockp(rq))
{
lockdep_assert_held(__rq_lockp(rq));
}
extern void raw_spin_rq_lock_nested(struct rq *rq, int subclass)
__acquires(__rq_lockp(rq));
extern bool raw_spin_rq_trylock(struct rq *rq)
__cond_acquires(true, __rq_lockp(rq));
static inline void raw_spin_rq_lock(struct rq *rq)
__acquires(__rq_lockp(rq))
{
raw_spin_rq_lock_nested(rq, 0);
}
static inline void raw_spin_rq_unlock(struct rq *rq)
__releases(__rq_lockp(rq))
{
raw_spin_unlock(rq_lockp(rq));
}
static inline void raw_spin_rq_lock_irq(struct rq *rq)
__acquires(__rq_lockp(rq))
{
local_irq_disable();
raw_spin_rq_lock(rq);
}
static inline void raw_spin_rq_unlock_irq(struct rq *rq)
__releases(__rq_lockp(rq))
{
raw_spin_rq_unlock(rq);
local_irq_enable();
}
static inline unsigned long _raw_spin_rq_lock_irqsave(struct rq *rq)
__acquires(__rq_lockp(rq))
{
unsigned long flags;
local_irq_save(flags);
raw_spin_rq_lock(rq);
return flags;
}
static inline void raw_spin_rq_unlock_irqrestore(struct rq *rq, unsigned long flags)
__releases(__rq_lockp(rq))
{
raw_spin_rq_unlock(rq);
local_irq_restore(flags);
}
#define raw_spin_rq_lock_irqsave(rq, flags) \
do { \
flags = _raw_spin_rq_lock_irqsave(rq); \
} while (0)
extern void __update_idle_core(struct rq *rq);
static inline void update_idle_core(struct rq *rq)
{
if (sched_smt_active())
__update_idle_core(rq);
}
#ifdef CONFIG_FAIR_GROUP_SCHED
static inline struct task_struct *task_of(struct sched_entity *se)
{
WARN_ON_ONCE(!entity_is_task(se));
return container_of(se, struct task_struct, se);
}
static inline struct cfs_rq *task_cfs_rq(struct task_struct *p)
{
return p->se.cfs_rq;
}
/* runqueue on which this entity is (to be) queued */
static inline struct cfs_rq *cfs_rq_of(const struct sched_entity *se)
{
return se->cfs_rq;
}
/* runqueue "owned" by this group */
static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
{
return grp->my_q;
}
#else /* !CONFIG_FAIR_GROUP_SCHED: */
#define task_of(_se) container_of(_se, struct task_struct, se)
static inline struct cfs_rq *task_cfs_rq(const struct task_struct *p)
{
return &task_rq(p)->cfs;
}
static inline struct cfs_rq *cfs_rq_of(const struct sched_entity *se)
{
const struct task_struct *p = task_of(se);
struct rq *rq = task_rq(p);
return &rq->cfs;
}
/* runqueue "owned" by this group */
static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
{
return NULL;
}
#endif /* !CONFIG_FAIR_GROUP_SCHED */
extern void update_rq_avg_idle(struct rq *rq);
extern void update_rq_clock(struct rq *rq);
/*
* rq::clock_update_flags bits
*
* %RQCF_REQ_SKIP - will request skipping of clock update on the next
* call to __schedule(). This is an optimisation to avoid
* neighbouring rq clock updates.
*
* %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is
* in effect and calls to update_rq_clock() are being ignored.
*
* %RQCF_UPDATED - is a debug flag that indicates whether a call has been
* made to update_rq_clock() since the last time rq::lock was pinned.
*
* If inside of __schedule(), clock_update_flags will have been
* shifted left (a left shift is a cheap operation for the fast path
* to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use,
*
* if (rq-clock_update_flags >= RQCF_UPDATED)
*
* to check if %RQCF_UPDATED is set. It'll never be shifted more than
* one position though, because the next rq_unpin_lock() will shift it
* back.
*/
#define RQCF_REQ_SKIP 0x01
#define RQCF_ACT_SKIP 0x02
#define RQCF_UPDATED 0x04
static inline void assert_clock_updated(struct rq *rq)
{
/*
* The only reason for not seeing a clock update since the
* last rq_pin_lock() is if we're currently skipping updates.
*/
WARN_ON_ONCE(rq->clock_update_flags < RQCF_ACT_SKIP);
}
static inline u64 rq_clock(struct rq *rq)
{
lockdep_assert_rq_held(rq);
assert_clock_updated(rq);
return rq->clock;
}
static inline u64 rq_clock_task(struct rq *rq)
{
lockdep_assert_rq_held(rq);
assert_clock_updated(rq);
return rq->clock_task;
}
static inline void rq_clock_skip_update(struct rq *rq)
{
lockdep_assert_rq_held(rq);
rq->clock_update_flags |= RQCF_REQ_SKIP;
}
/*
* See rt task throttling, which is the only time a skip
* request is canceled.
*/
static inline void rq_clock_cancel_skipupdate(struct rq *rq)
{
lockdep_assert_rq_held(rq);
rq->clock_update_flags &= ~RQCF_REQ_SKIP;
}
/*
* During cpu offlining and rq wide unthrottling, we can trigger
* an update_rq_clock() for several cfs and rt runqueues (Typically
* when using list_for_each_entry_*)
* rq_clock_start_loop_update() can be called after updating the clock
* once and before iterating over the list to prevent multiple update.
* After the iterative traversal, we need to call rq_clock_stop_loop_update()
* to clear RQCF_ACT_SKIP of rq->clock_update_flags.
*/
static inline void rq_clock_start_loop_update(struct rq *rq)
{
lockdep_assert_rq_held(rq);
WARN_ON_ONCE(rq->clock_update_flags & RQCF_ACT_SKIP);
rq->clock_update_flags |= RQCF_ACT_SKIP;
}
static inline void rq_clock_stop_loop_update(struct rq *rq)
{
lockdep_assert_rq_held(rq);
rq->clock_update_flags &= ~RQCF_ACT_SKIP;
}
struct rq_flags {
unsigned long flags;
struct pin_cookie cookie;
/*
* A copy of (rq::clock_update_flags & RQCF_UPDATED) for the
* current pin context is stashed here in case it needs to be
* restored in rq_repin_lock().
*/
unsigned int clock_update_flags;
};
extern struct balance_callback balance_push_callback;
#ifdef CONFIG_SCHED_CLASS_EXT
extern const struct sched_class ext_sched_class;
DECLARE_STATIC_KEY_FALSE(__scx_enabled); /* SCX BPF scheduler loaded */
DECLARE_STATIC_KEY_FALSE(__scx_switched_all); /* all fair class tasks on SCX */
#define scx_enabled() static_branch_unlikely(&__scx_enabled)
#define scx_switched_all() static_branch_unlikely(&__scx_switched_all)
static inline void scx_rq_clock_update(struct rq *rq, u64 clock)
{
if (!scx_enabled())
return;
WRITE_ONCE(rq->scx.clock, clock);
smp_store_release(&rq->scx.flags, rq->scx.flags | SCX_RQ_CLK_VALID);
}
static inline void scx_rq_clock_invalidate(struct rq *rq)
{
if (!scx_enabled())
return;
WRITE_ONCE(rq->scx.flags, rq->scx.flags & ~SCX_RQ_CLK_VALID);
}
#else /* !CONFIG_SCHED_CLASS_EXT: */
#define scx_enabled() false
#define scx_switched_all() false
static inline void scx_rq_clock_update(struct rq *rq, u64 clock) {}
static inline void scx_rq_clock_invalidate(struct rq *rq) {}
#endif /* !CONFIG_SCHED_CLASS_EXT */
static inline void assert_balance_callbacks_empty(struct rq *rq)
{
WARN_ON_ONCE(IS_ENABLED(CONFIG_PROVE_LOCKING) &&
rq->balance_callback &&
rq->balance_callback != &balance_push_callback);
}
/*
* Lockdep annotation that avoids accidental unlocks; it's like a
* sticky/continuous lockdep_assert_held().
*
* This avoids code that has access to 'struct rq *rq' (basically everything in
* the scheduler) from accidentally unlocking the rq if they do not also have a
* copy of the (on-stack) 'struct rq_flags rf'.
*
* Also see Documentation/locking/lockdep-design.rst.
*/
static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf)
{
rf->cookie = lockdep_pin_lock(__rq_lockp(rq));
rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
rf->clock_update_flags = 0;
assert_balance_callbacks_empty(rq);
}
static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf)
{
if (rq->clock_update_flags > RQCF_ACT_SKIP)
rf->clock_update_flags = RQCF_UPDATED;
scx_rq_clock_invalidate(rq);
lockdep_unpin_lock(__rq_lockp(rq), rf->cookie);
}
static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf)
{
lockdep_repin_lock(__rq_lockp(rq), rf->cookie);
/*
* Restore the value we stashed in @rf for this pin context.
*/
rq->clock_update_flags |= rf->clock_update_flags;
}
#define __task_rq_lock(...) __acquire_ret(___task_rq_lock(__VA_ARGS__), __rq_lockp(__ret))
extern struct rq *___task_rq_lock(struct task_struct *p, struct rq_flags *rf) __acquires_ret;
#define task_rq_lock(...) __acquire_ret(_task_rq_lock(__VA_ARGS__), __rq_lockp(__ret))
extern struct rq *_task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(&p->pi_lock) __acquires_ret;
static inline void
__task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
__releases(__rq_lockp(rq))
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock(rq);
}
static inline void
task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
__releases(__rq_lockp(rq), &p->pi_lock)
{
__task_rq_unlock(rq, p, rf);
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
}
DEFINE_LOCK_GUARD_1(task_rq_lock, struct task_struct,
_T->rq = task_rq_lock(_T->lock, &_T->rf),
task_rq_unlock(_T->rq, _T->lock, &_T->rf),
struct rq *rq; struct rq_flags rf)
DECLARE_LOCK_GUARD_1_ATTRS(task_rq_lock, __acquires(_T->pi_lock), __releases((*(struct task_struct **)_T)->pi_lock))
#define class_task_rq_lock_constructor(_T) WITH_LOCK_GUARD_1_ATTRS(task_rq_lock, _T)
DEFINE_LOCK_GUARD_1(__task_rq_lock, struct task_struct,
_T->rq = __task_rq_lock(_T->lock, &_T->rf),
__task_rq_unlock(_T->rq, _T->lock, &_T->rf),
struct rq *rq; struct rq_flags rf)
static inline void rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
__acquires(__rq_lockp(rq))
{
raw_spin_rq_lock_irqsave(rq, rf->flags);
rq_pin_lock(rq, rf);
}
static inline void rq_lock_irq(struct rq *rq, struct rq_flags *rf)
__acquires(__rq_lockp(rq))
{
raw_spin_rq_lock_irq(rq);
rq_pin_lock(rq, rf);
}
static inline void rq_lock(struct rq *rq, struct rq_flags *rf)
__acquires(__rq_lockp(rq))
{
raw_spin_rq_lock(rq);
rq_pin_lock(rq, rf);
}
static inline void rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf)
__releases(__rq_lockp(rq))
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock_irqrestore(rq, rf->flags);
}
static inline void rq_unlock_irq(struct rq *rq, struct rq_flags *rf)
__releases(__rq_lockp(rq))
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock_irq(rq);
}
static inline void rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(__rq_lockp(rq))
{
rq_unpin_lock(rq, rf);
raw_spin_rq_unlock(rq);
}
DEFINE_LOCK_GUARD_1(rq_lock, struct rq,
rq_lock(_T->lock, &_T->rf),
rq_unlock(_T->lock, &_T->rf),
struct rq_flags rf)
DECLARE_LOCK_GUARD_1_ATTRS(rq_lock, __acquires(__rq_lockp(_T)),
__releases(__rq_lockp(*(struct rq **)_T)));
#define class_rq_lock_constructor(_T) WITH_LOCK_GUARD_1_ATTRS(rq_lock, _T)
DEFINE_LOCK_GUARD_1(rq_lock_irq, struct rq,
rq_lock_irq(_T->lock, &_T->rf),
rq_unlock_irq(_T->lock, &_T->rf),
struct rq_flags rf)
DECLARE_LOCK_GUARD_1_ATTRS(rq_lock_irq, __acquires(__rq_lockp(_T)),
__releases(__rq_lockp(*(struct rq **)_T)));
#define class_rq_lock_irq_constructor(_T) WITH_LOCK_GUARD_1_ATTRS(rq_lock_irq, _T)
DEFINE_LOCK_GUARD_1(rq_lock_irqsave, struct rq,
rq_lock_irqsave(_T->lock, &_T->rf),
rq_unlock_irqrestore(_T->lock, &_T->rf),
struct rq_flags rf)
DECLARE_LOCK_GUARD_1_ATTRS(rq_lock_irqsave, __acquires(__rq_lockp(_T)),
__releases(__rq_lockp(*(struct rq **)_T)));
#define class_rq_lock_irqsave_constructor(_T) WITH_LOCK_GUARD_1_ATTRS(rq_lock_irqsave, _T)
DEFINE_LOCK_GUARD_1(raw_spin_rq_lock_irqsave, struct rq,
raw_spin_rq_lock_irqsave(_T->lock, _T->flags),
raw_spin_rq_unlock_irqrestore(_T->lock, _T->flags),
unsigned long flags)
DECLARE_LOCK_GUARD_1_ATTRS(raw_spin_rq_lock_irqsave, __acquires(__rq_lockp(_T)),
__releases(__rq_lockp(*(struct rq **)_T)));
#define class_raw_spin_rq_lock_irqsave_constructor(_T) \
WITH_LOCK_GUARD_1_ATTRS(raw_spin_rq_lock_irqsave, _T)
#define this_rq_lock_irq(...) __acquire_ret(_this_rq_lock_irq(__VA_ARGS__), __rq_lockp(__ret))
static inline struct rq *_this_rq_lock_irq(struct rq_flags *rf) __acquires_ret
{
struct rq *rq;
local_irq_disable();
rq = this_rq();
rq_lock(rq, rf);
return rq;
}
#ifdef CONFIG_NUMA
enum numa_topology_type {
NUMA_DIRECT,
NUMA_GLUELESS_MESH,
NUMA_BACKPLANE,
};
extern enum numa_topology_type sched_numa_topology_type;
extern int sched_max_numa_distance;
extern bool find_numa_distance(int distance);
extern void sched_init_numa(int offline_node);
extern void sched_update_numa(int cpu, bool online);
extern void sched_domains_numa_masks_set(unsigned int cpu);
extern void sched_domains_numa_masks_clear(unsigned int cpu);
extern int sched_numa_find_closest(const struct cpumask *cpus, int cpu);
#else /* !CONFIG_NUMA: */
static inline void sched_init_numa(int offline_node) { }
static inline void sched_update_numa(int cpu, bool online) { }
static inline void sched_domains_numa_masks_set(unsigned int cpu) { }
static inline void sched_domains_numa_masks_clear(unsigned int cpu) { }
static inline int sched_numa_find_closest(const struct cpumask *cpus, int cpu)
{
return nr_cpu_ids;
}
#endif /* !CONFIG_NUMA */
#ifdef CONFIG_NUMA_BALANCING
/* The regions in numa_faults array from task_struct */
enum numa_faults_stats {
NUMA_MEM = 0,
NUMA_CPU,
NUMA_MEMBUF,
NUMA_CPUBUF
};
extern void sched_setnuma(struct task_struct *p, int node);
extern int migrate_task_to(struct task_struct *p, int cpu);
extern int migrate_swap(struct task_struct *p, struct task_struct *t,
int cpu, int scpu);
extern void init_numa_balancing(u64 clone_flags, struct task_struct *p);
#else /* !CONFIG_NUMA_BALANCING: */
static inline void
init_numa_balancing(u64 clone_flags, struct task_struct *p)
{
}
#endif /* !CONFIG_NUMA_BALANCING */
int task_llc(const struct task_struct *p);
static inline void
queue_balance_callback(struct rq *rq,
struct balance_callback *head,
void (*func)(struct rq *rq))
{
lockdep_assert_rq_held(rq);
/*
* Don't (re)queue an already queued item; nor queue anything when
* balance_push() is active, see the comment with
* balance_push_callback.
*/
if (unlikely(head->next || rq->balance_callback == &balance_push_callback))
return;
head->func = func;
head->next = rq->balance_callback;
rq->balance_callback = head;
}
#define rcu_dereference_sched_domain(p) \
rcu_dereference_all_check((p), lockdep_is_held(&sched_domains_mutex))
/*
* The domain tree (rq->sd) is protected by RCU's quiescent state transition.
* See destroy_sched_domains: call_rcu for details.
*
* The domain tree of any CPU may only be accessed from within
* preempt-disabled sections.
*/
#define for_each_domain(cpu, __sd) \
for (__sd = rcu_dereference_sched_domain(cpu_rq(cpu)->sd); \
__sd; __sd = __sd->parent)
/* A mask of all the SD flags that have the SDF_SHARED_CHILD metaflag */
#define SD_FLAG(name, mflags) (name * !!((mflags) & SDF_SHARED_CHILD)) |
static const unsigned int SD_SHARED_CHILD_MASK =
#include <linux/sched/sd_flags.h>
0;
#undef SD_FLAG
/**
* highest_flag_domain - Return highest sched_domain containing flag.
* @cpu: The CPU whose highest level of sched domain is to
* be returned.
* @flag: The flag to check for the highest sched_domain
* for the given CPU.
*
* Returns the highest sched_domain of a CPU which contains @flag. If @flag has
* the SDF_SHARED_CHILD metaflag, all the children domains also have @flag.
*/
static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
{
struct sched_domain *sd, *hsd = NULL;
for_each_domain(cpu, sd) {
if (sd->flags & flag) {
hsd = sd;
continue;
}
/*
* Stop the search if @flag is known to be shared at lower
* levels. It will not be found further up.
*/
if (flag & SD_SHARED_CHILD_MASK)
break;
}
return hsd;
}
static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
{
struct sched_domain *sd;
for_each_domain(cpu, sd) {
if (sd->flags & flag)
break;
}
return sd;
}
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_llc);
DECLARE_PER_CPU(int, sd_llc_size);
DECLARE_PER_CPU(int, sd_llc_id);
DECLARE_PER_CPU(int, sd_share_id);
DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared);
DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_balance_shared);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing);
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity);
extern struct static_key_false sched_asym_cpucapacity;
extern struct static_key_false sched_cluster_active;
static __always_inline bool sched_asym_cpucap_active(void)
{
return static_branch_unlikely(&sched_asym_cpucapacity);
}
struct sched_group_capacity {
atomic_t ref;
/*
* CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
* for a single CPU.
*/
unsigned long capacity;
unsigned long min_capacity; /* Min per-CPU capacity in group */
unsigned long max_capacity; /* Max per-CPU capacity in group */
unsigned long next_update;
int imbalance; /* XXX unrelated to capacity but shared group state */
int id;
unsigned long cpumask[]; /* Balance mask */
};
struct sched_group {
struct sched_group *next; /* Must be a circular list */
atomic_t ref;
unsigned int group_weight;
unsigned int cores;
struct sched_group_capacity *sgc;
int asym_prefer_cpu; /* CPU of highest priority in group */
int flags;
/*
* The CPUs this group covers.
*
* NOTE: this field is variable length. (Allocated dynamically
* by attaching extra space to the end of the structure,
* depending on how many CPUs the kernel has booted up with)
*/
unsigned long cpumask[];
};
static inline struct cpumask *sched_group_span(struct sched_group *sg)
{
return to_cpumask(sg->cpumask);
}
/*
* See build_balance_mask().
*/
static inline struct cpumask *group_balance_mask(struct sched_group *sg)
{
return to_cpumask(sg->sgc->cpumask);
}
extern int group_balance_cpu(struct sched_group *sg);
extern void update_sched_domain_debugfs(void);
extern void dirty_sched_domain_sysctl(int cpu);
extern int sched_update_scaling(void);
static inline const struct cpumask *task_user_cpus(struct task_struct *p)
{
if (!p->user_cpus_ptr)
return cpu_possible_mask; /* &init_task.cpus_mask */
return p->user_cpus_ptr;
}
#ifdef CONFIG_CGROUP_SCHED
/*
* Return the group to which this tasks belongs.
*
* We cannot use task_css() and friends because the cgroup subsystem
* changes that value before the cgroup_subsys::attach() method is called,
* therefore we cannot pin it and might observe the wrong value.
*
* The same is true for autogroup's p->signal->autogroup->tg, the autogroup
* core changes this before calling sched_move_task().
*
* Instead we use a 'copy' which is updated from sched_move_task() while
* holding both task_struct::pi_lock and rq::lock.
*/
static inline struct task_group *task_group(struct task_struct *p)
{
return p->sched_task_group;
}
#ifdef CONFIG_FAIR_GROUP_SCHED
/*
* Defined here to be available before stats.h is included, since
* stats.h has dependencies on things defined later in this file.
*/
struct cfs_tg_state {
struct cfs_rq cfs_rq;
struct sched_entity se;
struct sched_statistics stats;
} __no_randomize_layout;
/* Access a specific CPU's cfs_rq from a task group */
static inline struct cfs_rq *tg_cfs_rq(struct task_group *tg, int cpu)
{
return per_cpu_ptr(tg->cfs_rq, cpu);
}
static inline struct sched_entity *tg_se(struct task_group *tg, int cpu)
{
struct cfs_tg_state *state;
if (is_root_task_group(tg))
return NULL;
state = container_of(tg_cfs_rq(tg, cpu), struct cfs_tg_state, cfs_rq);
return &state->se;
}
static inline struct sched_entity *cfs_rq_se(struct cfs_rq *cfs_rq)
{
struct cfs_tg_state *state;
if (is_root_task_group(cfs_rq->tg))
return NULL;
state = container_of(cfs_rq, struct cfs_tg_state, cfs_rq);
return &state->se;
}
#endif
/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
{
#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
struct task_group *tg = task_group(p);
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED
set_task_rq_fair(&p->se, p->se.cfs_rq, tg_cfs_rq(tg, cpu));
p->se.cfs_rq = tg_cfs_rq(tg, cpu);
p->se.parent = tg_se(tg, cpu);
p->se.depth = p->se.parent ? p->se.parent->depth + 1 : 0;
#endif
#ifdef CONFIG_RT_GROUP_SCHED
/*
* p->rt.rt_rq is NULL initially and it is easier to assign
* root_task_group's rt_rq than switching in rt_rq_of_se()
* Clobbers tg(!)
*/
if (!rt_group_sched_enabled())
tg = &root_task_group;
p->rt.rt_rq = tg->rt_rq[cpu];
p->rt.parent = tg->rt_se[cpu];
#endif /* CONFIG_RT_GROUP_SCHED */
}
#else /* !CONFIG_CGROUP_SCHED: */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
static inline struct task_group *task_group(struct task_struct *p)
{
return NULL;
}
#endif /* !CONFIG_CGROUP_SCHED */
static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
{
set_task_rq(p, cpu);
#ifdef CONFIG_SMP
/*
* After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
* successfully executed on another CPU. We must ensure that updates of
* per-task data have been completed by this moment.
*/
smp_wmb();
WRITE_ONCE(task_thread_info(p)->cpu, cpu);
p->wake_cpu = cpu;
rseq_sched_set_ids_changed(p);
#endif /* CONFIG_SMP */
}
/*
* Tunables:
*/
#define SCHED_FEAT(name, enabled) \
__SCHED_FEAT_##name ,
enum {
#include "features.h"
__SCHED_FEAT_NR,
};
#undef SCHED_FEAT
/*
* To support run-time toggling of sched features, all the translation units
* (but core.c) reference the sysctl_sched_features defined in core.c.
*/
extern __read_mostly unsigned int sysctl_sched_features;
#ifdef CONFIG_JUMP_LABEL
#define SCHED_FEAT(name, enabled) \
static __always_inline bool static_branch_##name(struct static_key *key) \
{ \
return static_key_##enabled(key); \
}
#include "features.h"
#undef SCHED_FEAT
extern struct static_key sched_feat_keys[__SCHED_FEAT_NR];
#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
#else /* !CONFIG_JUMP_LABEL: */
#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
#endif /* !CONFIG_JUMP_LABEL */
extern struct static_key_false sched_numa_balancing;
extern struct static_key_false sched_schedstats;
static inline u64 global_rt_period(void)
{
return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
}
static inline u64 global_rt_runtime(void)
{
if (sysctl_sched_rt_runtime < 0)
return RUNTIME_INF;
return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
}
/*
* Is p the current execution context?
*/
static inline int task_current(struct rq *rq, struct task_struct *p)
{
return rq->curr == p;
}
/*
* Is p the current scheduling context?
*
* Note that it might be the current execution context at the same time if
* rq->curr == rq->donor == p.
*/
static inline int task_current_donor(struct rq *rq, struct task_struct *p)
{
return rq->donor == p;
}
static inline bool task_is_blocked(struct task_struct *p)
{
if (!sched_proxy_exec())
return false;
return !!p->blocked_on;
}
static inline int task_on_cpu(struct rq *rq, struct task_struct *p)
{
return p->on_cpu;
}
static inline int task_on_rq_queued(struct task_struct *p)
{
return READ_ONCE(p->on_rq) == TASK_ON_RQ_QUEUED;
}
static inline int task_on_rq_migrating(struct task_struct *p)
{
return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING;
}
/* Wake flags. The first three directly map to some SD flag value */
#define WF_EXEC 0x02 /* Wakeup after exec; maps to SD_BALANCE_EXEC */
#define WF_FORK 0x04 /* Wakeup after fork; maps to SD_BALANCE_FORK */
#define WF_TTWU 0x08 /* Wakeup; maps to SD_BALANCE_WAKE */
#define WF_SYNC 0x10 /* Waker goes to sleep after wakeup */
#define WF_MIGRATED 0x20 /* Internal use, task got migrated */
#define WF_CURRENT_CPU 0x40 /* Prefer to move the wakee to the current CPU. */
#define WF_RQ_SELECTED 0x80 /* ->select_task_rq() was called */
static_assert(WF_EXEC == SD_BALANCE_EXEC);
static_assert(WF_FORK == SD_BALANCE_FORK);
static_assert(WF_TTWU == SD_BALANCE_WAKE);
/*
* To aid in avoiding the subversion of "niceness" due to uneven distribution
* of tasks with abnormal "nice" values across CPUs the contribution that
* each task makes to its run queue's load is weighted according to its
* scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
* scaled version of the new time slice allocation that they receive on time
* slice expiry etc.
*/
#define WEIGHT_IDLEPRIO 3
#define WMULT_IDLEPRIO 1431655765
extern const int sched_prio_to_weight[40];
extern const u32 sched_prio_to_wmult[40];
/*
* {de,en}queue flags:
*
* SLEEP/WAKEUP - task is no-longer/just-became runnable
*
* SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks
* are in a known state which allows modification. Such pairs
* should preserve as much state as possible.
*
* MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location
* in the runqueue. IOW the priority is allowed to change. Callers
* must expect to deal with balance callbacks.
*
* NOCLOCK - skip the update_rq_clock() (avoids double updates)
*
* MIGRATION - p->on_rq == TASK_ON_RQ_MIGRATING (used for DEADLINE)
*
* DELAYED - de/re-queue a sched_delayed task
*
* CLASS - going to update p->sched_class; makes sched_change call the
* various switch methods.
*
* ENQUEUE_HEAD - place at front of runqueue (tail if not specified)
* ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline)
* ENQUEUE_MIGRATED - the task was migrated during wakeup
* ENQUEUE_RQ_SELECTED - ->select_task_rq() was called
*
* XXX SAVE/RESTORE in combination with CLASS doesn't really make sense, but
* SCHED_DEADLINE seems to rely on this for now.
*/
#define DEQUEUE_SLEEP 0x0001 /* Matches ENQUEUE_WAKEUP */
#define DEQUEUE_SAVE 0x0002 /* Matches ENQUEUE_RESTORE */
#define DEQUEUE_MOVE 0x0004 /* Matches ENQUEUE_MOVE */
#define DEQUEUE_NOCLOCK 0x0008 /* Matches ENQUEUE_NOCLOCK */
#define DEQUEUE_MIGRATING 0x0010 /* Matches ENQUEUE_MIGRATING */
#define DEQUEUE_DELAYED 0x0020 /* Matches ENQUEUE_DELAYED */
#define DEQUEUE_CLASS 0x0040 /* Matches ENQUEUE_CLASS */
#define DEQUEUE_SPECIAL 0x00010000
#define DEQUEUE_THROTTLE 0x00020000
#define ENQUEUE_WAKEUP 0x0001
#define ENQUEUE_RESTORE 0x0002
#define ENQUEUE_MOVE 0x0004
#define ENQUEUE_NOCLOCK 0x0008
#define ENQUEUE_MIGRATING 0x0010
#define ENQUEUE_DELAYED 0x0020
#define ENQUEUE_CLASS 0x0040
#define ENQUEUE_HEAD 0x00010000
#define ENQUEUE_REPLENISH 0x00020000
#define ENQUEUE_MIGRATED 0x00040000
#define ENQUEUE_INITIAL 0x00080000
#define ENQUEUE_RQ_SELECTED 0x00100000
#define ENQUEUE_QUEUED 0x00200000
#define RETRY_TASK ((void *)-1UL)
struct affinity_context {
const struct cpumask *new_mask;
struct cpumask *user_mask;
unsigned int flags;
};
extern s64 update_curr_common(struct rq *rq);
struct sched_class {
#ifdef CONFIG_UCLAMP_TASK
int uclamp_enabled;
#endif
/*
* move_queued_task/activate_task/enqueue_task: rq->lock
* ttwu_do_activate/activate_task/enqueue_task: rq->lock
* wake_up_new_task/activate_task/enqueue_task: task_rq_lock
* ttwu_runnable/enqueue_task: task_rq_lock
* proxy_task_current: rq->lock
* sched_change_end
*/
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
/*
* move_queued_task/deactivate_task/dequeue_task: rq->lock
* __schedule/block_task/dequeue_task: rq->lock
* proxy_task_current: rq->lock
* wait_task_inactive: task_rq_lock
* sched_change_begin
*/
bool (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
/*
* do_sched_yield: rq->lock
*/
void (*yield_task) (struct rq *rq);
/*
* yield_to: rq->lock (double)
*/
bool (*yield_to_task)(struct rq *rq, struct task_struct *p);
/*
* move_queued_task: rq->lock
* __migrate_swap_task: rq->lock
* ttwu_do_activate: rq->lock
* ttwu_runnable: task_rq_lock
* wake_up_new_task: task_rq_lock
*/
void (*wakeup_preempt)(struct rq *rq, struct task_struct *p, int flags);
/*
* schedule/pick_next_task/prev_balance: rq->lock
*/
int (*balance)(struct rq *rq, struct rq_flags *rf);
/*
* schedule/pick_next_task: rq->lock
*/
struct task_struct *(*pick_task)(struct rq *rq, struct rq_flags *rf);
/*
* sched_change:
* __schedule: rq->lock
*/
void (*put_prev_task)(struct rq *rq, struct task_struct *p, struct task_struct *next);
void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);
/*
* select_task_rq: p->pi_lock
* sched_exec: p->pi_lock
*/
int (*select_task_rq)(struct task_struct *p, int task_cpu, int flags);
/*
* set_task_cpu: p->pi_lock || rq->lock (ttwu like)
*/
void (*migrate_task_rq)(struct task_struct *p, int new_cpu);
/*
* ttwu_do_activate: rq->lock
* wake_up_new_task: task_rq_lock
*/
void (*task_woken)(struct rq *this_rq, struct task_struct *task);
/*
* do_set_cpus_allowed: task_rq_lock + sched_change
*/
void (*set_cpus_allowed)(struct task_struct *p, struct affinity_context *ctx);
/*
* sched_set_rq_{on,off}line: rq->lock
*/
void (*rq_online)(struct rq *rq);
void (*rq_offline)(struct rq *rq);
/*
* push_cpu_stop: p->pi_lock && rq->lock
*/
struct rq *(*find_lock_rq)(struct task_struct *p, struct rq *rq);
/*
* hrtick: rq->lock
* sched_tick: rq->lock
* sched_tick_remote: rq->lock
*/
void (*task_tick)(struct rq *rq, struct task_struct *p, int queued);
/*
* sched_cgroup_fork: p->pi_lock
*/
void (*task_fork)(struct task_struct *p);
/*
* finish_task_switch: no locks
*/
void (*task_dead)(struct task_struct *p);
/*
* sched_change
*/
void (*switching_from)(struct rq *this_rq, struct task_struct *task);
void (*switched_from) (struct rq *this_rq, struct task_struct *task);
void (*switching_to) (struct rq *this_rq, struct task_struct *task);
void (*switched_to) (struct rq *this_rq, struct task_struct *task);
u64 (*get_prio) (struct rq *this_rq, struct task_struct *task);
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
u64 oldprio);
/*
* set_load_weight: task_rq_lock + sched_change
* __setscheduler_parms: task_rq_lock + sched_change
*/
void (*reweight_task)(struct rq *this_rq, struct task_struct *task,
const struct load_weight *lw);
/*
* sched_rr_get_interval: task_rq_lock
*/
unsigned int (*get_rr_interval)(struct rq *rq,
struct task_struct *task);
/*
* task_sched_runtime: task_rq_lock
*/
void (*update_curr)(struct rq *rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
/*
* sched_change_group: task_rq_lock + sched_change
*/
void (*task_change_group)(struct task_struct *p);
#endif
#ifdef CONFIG_SCHED_CORE
/*
* pick_next_task: rq->lock
* try_steal_cookie: rq->lock (double)
*/
int (*task_is_throttled)(struct task_struct *p, int cpu);
#endif
};
static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
{
WARN_ON_ONCE(rq->donor != prev);
prev->sched_class->put_prev_task(rq, prev, NULL);
}
static inline void set_next_task(struct rq *rq, struct task_struct *next)
{
next->sched_class->set_next_task(rq, next, false);
}
static inline void
__put_prev_set_next_dl_server(struct rq *rq,
struct task_struct *prev,
struct task_struct *next)
{
prev->dl_server = NULL;
next->dl_server = rq->dl_server;
rq->dl_server = NULL;
}
static inline void put_prev_set_next_task(struct rq *rq,
struct task_struct *prev,
struct task_struct *next)
{
WARN_ON_ONCE(rq->donor != prev);
__put_prev_set_next_dl_server(rq, prev, next);
if (next == prev)
return;
prev->sched_class->put_prev_task(rq, prev, next);
next->sched_class->set_next_task(rq, next, true);
}
/*
* Helper to define a sched_class instance; each one is placed in a separate
* section which is ordered by the linker script:
*
* include/asm-generic/vmlinux.lds.h
*
* *CAREFUL* they are laid out in *REVERSE* order!!!
*
* Also enforce alignment on the instance, not the type, to guarantee layout.
*/
#define DEFINE_SCHED_CLASS(name) \
const struct sched_class name##_sched_class \
__aligned(__alignof__(struct sched_class)) \
__section("__" #name "_sched_class")
/* Defined in include/asm-generic/vmlinux.lds.h */
extern struct sched_class __sched_class_highest[];
extern struct sched_class __sched_class_lowest[];
extern const struct sched_class stop_sched_class;
extern const struct sched_class dl_sched_class;
extern const struct sched_class rt_sched_class;
extern const struct sched_class fair_sched_class;
extern const struct sched_class idle_sched_class;
/*
* Iterate only active classes. SCX can take over all fair tasks or be
* completely disabled. If the former, skip fair. If the latter, skip SCX.
*/
static inline const struct sched_class *next_active_class(const struct sched_class *class)
{
class++;
#ifdef CONFIG_SCHED_CLASS_EXT
if (scx_switched_all() && class == &fair_sched_class)
class++;
if (!scx_enabled() && class == &ext_sched_class)
class++;
#endif
return class;
}
#define for_class_range(class, _from, _to) \
for (class = (_from); class < (_to); class++)
#define for_each_class(class) \
for_class_range(class, __sched_class_highest, __sched_class_lowest)
#define for_active_class_range(class, _from, _to) \
for (class = (_from); class != (_to); class = next_active_class(class))
#define for_each_active_class(class) \
for_active_class_range(class, __sched_class_highest, __sched_class_lowest)
#define sched_class_above(_a, _b) ((_a) < (_b))
static inline void rq_modified_begin(struct rq *rq, const struct sched_class *class)
{
if (sched_class_above(rq->next_class, class))
rq->next_class = class;
}
static inline bool rq_modified_above(struct rq *rq, const struct sched_class *class)
{
return sched_class_above(rq->next_class, class);
}
static inline bool sched_stop_runnable(struct rq *rq)
{
return rq->stop && task_on_rq_queued(rq->stop);
}
static inline bool sched_dl_runnable(struct rq *rq)
{
return rq->dl.dl_nr_running > 0;
}
static inline bool sched_rt_runnable(struct rq *rq)
{
return rq->rt.rt_queued > 0;
}
static inline bool sched_fair_runnable(struct rq *rq)
{
return rq->cfs.nr_queued > 0;
}
extern struct task_struct *pick_task_fair(struct rq *rq, struct rq_flags *rf);
extern struct task_struct *pick_task_idle(struct rq *rq, struct rq_flags *rf);
#define SCA_CHECK 0x01
#define SCA_MIGRATE_DISABLE 0x02
#define SCA_MIGRATE_ENABLE 0x04
#define SCA_USER 0x08
extern void update_group_capacity(struct sched_domain *sd, int cpu);
extern void sched_balance_trigger(struct rq *rq);
extern int __set_cpus_allowed_ptr(struct task_struct *p, struct affinity_context *ctx);
extern void set_cpus_allowed_common(struct task_struct *p, struct affinity_context *ctx);
static inline bool task_allowed_on_cpu(struct task_struct *p, int cpu)
{
/* When not in the task's cpumask, no point in looking further. */
if (!cpumask_test_cpu(cpu, p->cpus_ptr))
return false;
/* Can @cpu run a user thread? */
if (!(p->flags & PF_KTHREAD) && !task_cpu_possible(cpu, p))
return false;
return true;
}
static inline cpumask_t *alloc_user_cpus_ptr(int node)
{
/*
* See set_cpus_allowed_force() above for the rcu_head usage.
*/
int size = max_t(int, cpumask_size(), sizeof(struct rcu_head));
return kmalloc_node(size, GFP_KERNEL, node);
}
static inline struct task_struct *get_push_task(struct rq *rq)
{
struct task_struct *p = rq->donor;
lockdep_assert_rq_held(rq);
if (rq->push_busy)
return NULL;
if (p->nr_cpus_allowed == 1)
return NULL;
if (p->migration_disabled)
return NULL;
rq->push_busy = true;
return get_task_struct(p);
}
extern int push_cpu_stop(void *arg);
#ifdef CONFIG_CPU_IDLE
static inline void idle_set_state(struct rq *rq,
struct cpuidle_state *idle_state)
{
rq->idle_state = idle_state;
}
static inline struct cpuidle_state *idle_get_state(struct rq *rq)
{
lockdep_assert(rcu_read_lock_any_held());
return rq->idle_state;
}
#else /* !CONFIG_CPU_IDLE: */
static inline void idle_set_state(struct rq *rq,
struct cpuidle_state *idle_state)
{
}
static inline struct cpuidle_state *idle_get_state(struct rq *rq)
{
return NULL;
}
#endif /* !CONFIG_CPU_IDLE */
extern void schedule_idle(void);
asmlinkage void schedule_user(void);
extern void sysrq_sched_debug_show(void);
extern void sched_init_granularity(void);
extern void update_max_interval(void);
extern void init_sched_dl_class(void);
extern void init_sched_rt_class(void);
extern void init_sched_fair_class(void);
extern void resched_curr(struct rq *rq);
extern void resched_curr_lazy(struct rq *rq);
extern void resched_cpu(int cpu);
extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
extern bool sched_rt_bandwidth_account(struct rt_rq *rt_rq);
extern void init_dl_entity(struct sched_dl_entity *dl_se);
extern void init_cfs_throttle_work(struct task_struct *p);
#define BW_SHIFT 20
#define BW_UNIT (1 << BW_SHIFT)
#define RATIO_SHIFT 8
#define MAX_BW_BITS (64 - BW_SHIFT)
#define MAX_BW ((1ULL << MAX_BW_BITS) - 1)
extern u64 to_ratio(u64 period, u64 runtime);
extern void init_entity_runnable_average(struct sched_entity *se);
extern void post_init_entity_util_avg(struct task_struct *p);
#ifdef CONFIG_NO_HZ_FULL
extern bool sched_can_stop_tick(struct rq *rq);
extern int __init sched_tick_offload_init(void);
/*
* Tick may be needed by tasks in the runqueue depending on their policy and
* requirements. If tick is needed, lets send the target an IPI to kick it out of
* nohz mode if necessary.
*/
static inline void sched_update_tick_dependency(struct rq *rq)
{
int cpu = cpu_of(rq);
if (!tick_nohz_full_cpu(cpu))
return;
if (sched_can_stop_tick(rq))
tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED);
else
tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED);
}
#else /* !CONFIG_NO_HZ_FULL: */
static inline int sched_tick_offload_init(void) { return 0; }
static inline void sched_update_tick_dependency(struct rq *rq) { }
#endif /* !CONFIG_NO_HZ_FULL */
static inline void add_nr_running(struct rq *rq, unsigned count)
{
unsigned prev_nr = rq->nr_running;
rq->nr_running = prev_nr + count;
if (trace_sched_update_nr_running_tp_enabled()) {
call_trace_sched_update_nr_running(rq, count);
}
if (prev_nr < 2 && rq->nr_running >= 2)
set_rd_overloaded(rq->rd, 1);
sched_update_tick_dependency(rq);
}
static inline void sub_nr_running(struct rq *rq, unsigned count)
{
rq->nr_running -= count;
if (trace_sched_update_nr_running_tp_enabled()) {
call_trace_sched_update_nr_running(rq, -count);
}
/* Check if we still need preemption */
sched_update_tick_dependency(rq);
}
static inline void __block_task(struct rq *rq, struct task_struct *p)
{
if (p->sched_contributes_to_load)
rq->nr_uninterruptible++;
if (p->in_iowait) {
atomic_inc(&rq->nr_iowait);
delayacct_blkio_start();
}
ASSERT_EXCLUSIVE_WRITER(p->on_rq);
/*
* The moment this write goes through, ttwu() can swoop in and migrate
* this task, rendering our rq->__lock ineffective.
*
* __schedule() try_to_wake_up()
* LOCK rq->__lock LOCK p->pi_lock
* pick_next_task()
* pick_next_task_fair()
* pick_next_entity()
* dequeue_entities()
* __block_task()
* RELEASE p->on_rq = 0 if (p->on_rq && ...)
* break;
*
* ACQUIRE (after ctrl-dep)
*
* cpu = select_task_rq();
* set_task_cpu(p, cpu);
* ttwu_queue()
* ttwu_do_activate()
* LOCK rq->__lock
* activate_task()
* STORE p->on_rq = 1
* UNLOCK rq->__lock
*
* Callers must ensure to not reference @p after this -- we no longer
* own it.
*/
smp_store_release(&p->on_rq, 0);
}
extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);
extern void wakeup_preempt(struct rq *rq, struct task_struct *p, int flags);
/*
* attach_task() -- attach the task detached by detach_task() to its new rq.
*/
static inline void attach_task(struct rq *rq, struct task_struct *p)
{
lockdep_assert_rq_held(rq);
WARN_ON_ONCE(task_rq(p) != rq);
activate_task(rq, p, ENQUEUE_NOCLOCK);
wakeup_preempt(rq, p, 0);
}
/*
* attach_one_task() -- attaches the task returned from detach_one_task() to
* its new rq.
*/
static inline void attach_one_task(struct rq *rq, struct task_struct *p)
{
guard(rq_lock)(rq);
update_rq_clock(rq);
attach_task(rq, p);
}
#ifdef CONFIG_PREEMPT_RT
# define SCHED_NR_MIGRATE_BREAK 8
#else
# define SCHED_NR_MIGRATE_BREAK 32
#endif
extern __read_mostly unsigned int sysctl_sched_nr_migrate;
extern __read_mostly unsigned int sysctl_sched_migration_cost;
extern unsigned int sysctl_sched_base_slice;
extern int sysctl_resched_latency_warn_ms;
extern int sysctl_resched_latency_warn_once;
extern unsigned int sysctl_sched_tunable_scaling;
extern unsigned int sysctl_numa_balancing_scan_delay;
extern unsigned int sysctl_numa_balancing_scan_period_min;
extern unsigned int sysctl_numa_balancing_scan_period_max;
extern unsigned int sysctl_numa_balancing_scan_size;
extern unsigned int sysctl_numa_balancing_hot_threshold;
#ifdef CONFIG_SCHED_HRTICK
/*
* Use hrtick when:
* - enabled by features
* - hrtimer is actually high res
*/
static inline bool hrtick_enabled(struct rq *rq)
{
return cpu_active(cpu_of(rq)) && hrtimer_highres_enabled();
}
static inline bool hrtick_enabled_fair(struct rq *rq)
{
return sched_feat(HRTICK) && hrtick_enabled(rq);
}
static inline bool hrtick_enabled_dl(struct rq *rq)
{
return sched_feat(HRTICK_DL) && hrtick_enabled(rq);
}
extern void hrtick_start(struct rq *rq, u64 delay);
static inline bool hrtick_active(struct rq *rq)
{
return hrtimer_active(&rq->hrtick_timer);
}
#else /* !CONFIG_SCHED_HRTICK: */
static inline bool hrtick_enabled_fair(struct rq *rq) { return false; }
static inline bool hrtick_enabled_dl(struct rq *rq) { return false; }
static inline bool hrtick_enabled(struct rq *rq) { return false; }
#endif /* !CONFIG_SCHED_HRTICK */
#ifndef arch_scale_freq_tick
static __always_inline void arch_scale_freq_tick(void) { }
#endif
#ifndef arch_scale_freq_capacity
/**
* arch_scale_freq_capacity - get the frequency scale factor of a given CPU.
* @cpu: the CPU in question.
*
* Return: the frequency scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
*
* f_curr
* ------ * SCHED_CAPACITY_SCALE
* f_max
*/
static __always_inline
unsigned long arch_scale_freq_capacity(int cpu)
{
return SCHED_CAPACITY_SCALE;
}
#endif
/*
* In double_lock_balance()/double_rq_lock(), we use raw_spin_rq_lock() to
* acquire rq lock instead of rq_lock(). So at the end of these two functions
* we need to call double_rq_clock_clear_update() to clear RQCF_UPDATED of
* rq->clock_update_flags to avoid the WARN_DOUBLE_CLOCK warning.
*/
static inline void double_rq_clock_clear_update(struct rq *rq1, struct rq *rq2)
{
rq1->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
rq2->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
}
#define DEFINE_LOCK_GUARD_2(name, type, _lock, _unlock, ...) \
__DEFINE_UNLOCK_GUARD(name, type, _unlock, type *lock2; __VA_ARGS__) \
static inline class_##name##_t class_##name##_constructor(type *lock, type *lock2) \
__no_context_analysis \
{ class_##name##_t _t = { .lock = lock, .lock2 = lock2 }, *_T = &_t; \
_lock; return _t; }
#define DECLARE_LOCK_GUARD_2_ATTRS(_name, _lock, _unlock1, _unlock2) \
static inline class_##_name##_t class_##_name##_constructor(lock_##_name##_t *_T1, \
lock_##_name##_t *_T2) _lock; \
static __always_inline void __class_##_name##_cleanup_ctx1(class_##_name##_t **_T1) \
__no_context_analysis _unlock1 { } \
static __always_inline void __class_##_name##_cleanup_ctx2(class_##_name##_t **_T2) \
__no_context_analysis _unlock2 { }
#define WITH_LOCK_GUARD_2_ATTRS(_name, _T1, _T2) \
class_##_name##_constructor(_T1, _T2), \
*__UNIQUE_ID(unlock1) __cleanup(__class_##_name##_cleanup_ctx1) = (void *)(_T1),\
*__UNIQUE_ID(unlock2) __cleanup(__class_##_name##_cleanup_ctx2) = (void *)(_T2)
static inline bool rq_order_less(struct rq *rq1, struct rq *rq2)
{
#ifdef CONFIG_SCHED_CORE
/*
* In order to not have {0,2},{1,3} turn into into an AB-BA,
* order by core-id first and cpu-id second.
*
* Notably:
*
* double_rq_lock(0,3); will take core-0, core-1 lock
* double_rq_lock(1,2); will take core-1, core-0 lock
*
* when only cpu-id is considered.
*/
if (rq1->core->cpu < rq2->core->cpu)
return true;
if (rq1->core->cpu > rq2->core->cpu)
return false;
/*
* __sched_core_flip() relies on SMT having cpu-id lock order.
*/
#endif /* CONFIG_SCHED_CORE */
return rq1->cpu < rq2->cpu;
}
extern void double_rq_lock(struct rq *rq1, struct rq *rq2)
__acquires(__rq_lockp(rq1), __rq_lockp(rq2));
#ifdef CONFIG_PREEMPTION
/*
* fair double_lock_balance: Safely acquires both rq->locks in a fair
* way at the expense of forcing extra atomic operations in all
* invocations. This assures that the double_lock is acquired using the
* same underlying policy as the spinlock_t on this architecture, which
* reduces latency compared to the unfair variant below. However, it
* also adds more overhead and therefore may reduce throughput.
*/
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
__must_hold(__rq_lockp(this_rq))
__acquires(__rq_lockp(busiest))
{
raw_spin_rq_unlock(this_rq);
double_rq_lock(this_rq, busiest);
return 1;
}
#else /* !CONFIG_PREEMPTION: */
/*
* Unfair double_lock_balance: Optimizes throughput at the expense of
* latency by eliminating extra atomic operations when the locks are
* already in proper order on entry. This favors lower CPU-ids and will
* grant the double lock to lower CPUs over higher ids under contention,
* regardless of entry order into the function.
*/
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
__must_hold(__rq_lockp(this_rq))
__acquires(__rq_lockp(busiest))
{
if (__rq_lockp(this_rq) == __rq_lockp(busiest)) {
__acquire(__rq_lockp(busiest)); /* already held */
double_rq_clock_clear_update(this_rq, busiest);
return 0;
}
if (likely(raw_spin_rq_trylock(busiest))) {
double_rq_clock_clear_update(this_rq, busiest);
return 0;
}
if (rq_order_less(this_rq, busiest)) {
raw_spin_rq_lock_nested(busiest, SINGLE_DEPTH_NESTING);
double_rq_clock_clear_update(this_rq, busiest);
return 0;
}
raw_spin_rq_unlock(this_rq);
double_rq_lock(this_rq, busiest);
return 1;
}
#endif /* !CONFIG_PREEMPTION */
/*
* double_lock_balance - lock the busiest runqueue, this_rq is locked already.
*/
static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
__must_hold(__rq_lockp(this_rq))
__acquires(__rq_lockp(busiest))
{
lockdep_assert_irqs_disabled();
return _double_lock_balance(this_rq, busiest);
}
static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
__releases(__rq_lockp(busiest))
{
if (__rq_lockp(this_rq) != __rq_lockp(busiest))
raw_spin_rq_unlock(busiest);
else
__release(__rq_lockp(busiest)); /* fake release */
lock_set_subclass(&__rq_lockp(this_rq)->dep_map, 0, _RET_IP_);
}
static inline void double_lock(spinlock_t *l1, spinlock_t *l2)
__acquires(l1, l2)
{
if (l1 > l2)
swap(l1, l2);
spin_lock(l1);
spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}
static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2)
__acquires(l1, l2)
{
if (l1 > l2)
swap(l1, l2);
spin_lock_irq(l1);
spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}
static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2)
__acquires(l1, l2)
{
if (l1 > l2)
swap(l1, l2);
raw_spin_lock(l1);
raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
}
static inline void double_raw_unlock(raw_spinlock_t *l1, raw_spinlock_t *l2)
__releases(l1, l2)
{
raw_spin_unlock(l1);
raw_spin_unlock(l2);
}
DEFINE_LOCK_GUARD_2(double_raw_spinlock, raw_spinlock_t,
double_raw_lock(_T->lock, _T->lock2),
double_raw_unlock(_T->lock, _T->lock2))
DECLARE_LOCK_GUARD_2_ATTRS(double_raw_spinlock,
__acquires(_T1, _T2),
__releases(*(raw_spinlock_t **)_T1),
__releases(*(raw_spinlock_t **)_T2));
#define class_double_raw_spinlock_constructor(_T1, _T2) \
WITH_LOCK_GUARD_2_ATTRS(double_raw_spinlock, _T1, _T2)
/*
* double_rq_unlock - safely unlock two runqueues
*
* Note this does not restore interrupts like task_rq_unlock,
* you need to do so manually after calling.
*/
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
__releases(__rq_lockp(rq1), __rq_lockp(rq2))
{
if (__rq_lockp(rq1) != __rq_lockp(rq2))
raw_spin_rq_unlock(rq2);
else
__release(__rq_lockp(rq2)); /* fake release */
raw_spin_rq_unlock(rq1);
}
extern void set_rq_online (struct rq *rq);
extern void set_rq_offline(struct rq *rq);
extern bool sched_smp_initialized;
DEFINE_LOCK_GUARD_2(double_rq_lock, struct rq,
double_rq_lock(_T->lock, _T->lock2),
double_rq_unlock(_T->lock, _T->lock2))
extern struct sched_entity *__pick_root_entity(struct cfs_rq *cfs_rq);
extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);
extern bool sched_debug_verbose;
extern void print_cfs_stats(struct seq_file *m, int cpu);
extern void print_rt_stats(struct seq_file *m, int cpu);
extern void print_dl_stats(struct seq_file *m, int cpu);
extern void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
extern void resched_latency_warn(int cpu, u64 latency);
#ifdef CONFIG_NUMA_BALANCING
extern void show_numa_stats(struct task_struct *p, struct seq_file *m);
extern void
print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
unsigned long tpf, unsigned long gsf, unsigned long gpf);
#endif /* CONFIG_NUMA_BALANCING */
extern void init_cfs_rq(struct cfs_rq *cfs_rq);
extern void init_rt_rq(struct rt_rq *rt_rq);
extern void init_dl_rq(struct dl_rq *dl_rq);
extern void cfs_bandwidth_usage_inc(void);
extern void cfs_bandwidth_usage_dec(void);
#ifdef CONFIG_NO_HZ_COMMON
#define NOHZ_BALANCE_KICK_BIT 0
#define NOHZ_STATS_KICK_BIT 1
#define NOHZ_NEWILB_KICK_BIT 2
#define NOHZ_NEXT_KICK_BIT 3
/* Run sched_balance_domains() */
#define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT)
/* Update blocked load */
#define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT)
/* Update blocked load when entering idle */
#define NOHZ_NEWILB_KICK BIT(NOHZ_NEWILB_KICK_BIT)
/* Update nohz.next_balance */
#define NOHZ_NEXT_KICK BIT(NOHZ_NEXT_KICK_BIT)
#define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK | NOHZ_NEXT_KICK)
#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
extern void nohz_balance_exit_idle(struct rq *rq);
#else /* !CONFIG_NO_HZ_COMMON: */
static inline void nohz_balance_exit_idle(struct rq *rq) { }
#endif /* !CONFIG_NO_HZ_COMMON */
#ifdef CONFIG_NO_HZ_COMMON
extern void nohz_run_idle_balance(int cpu);
#else
static inline void nohz_run_idle_balance(int cpu) { }
#endif
#include "stats.h"
#if defined(CONFIG_SCHED_CORE) && defined(CONFIG_SCHEDSTATS)
extern void __sched_core_account_forceidle(struct rq *rq);
static inline void sched_core_account_forceidle(struct rq *rq)
{
if (schedstat_enabled())
__sched_core_account_forceidle(rq);
}
extern void __sched_core_tick(struct rq *rq);
static inline void sched_core_tick(struct rq *rq)
{
if (sched_core_enabled(rq) && schedstat_enabled())
__sched_core_tick(rq);
}
#else /* !(CONFIG_SCHED_CORE && CONFIG_SCHEDSTATS): */
static inline void sched_core_account_forceidle(struct rq *rq) { }
static inline void sched_core_tick(struct rq *rq) { }
#endif /* !(CONFIG_SCHED_CORE && CONFIG_SCHEDSTATS) */
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
struct irqtime {
u64 total;
u64 tick_delta;
u64 irq_start_time;
struct u64_stats_sync sync;
};
DECLARE_PER_CPU(struct irqtime, cpu_irqtime);
DECLARE_STATIC_KEY_FALSE(sched_clock_irqtime);
static inline int irqtime_enabled(void)
{
return static_branch_likely(&sched_clock_irqtime);
}
/*
* Returns the irqtime minus the softirq time computed by ksoftirqd.
* Otherwise ksoftirqd's sum_exec_runtime is subtracted its own runtime
* and never move forward.
*/
static inline u64 irq_time_read(int cpu)
{
struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu);
unsigned int seq;
u64 total;
do {
seq = __u64_stats_fetch_begin(&irqtime->sync);
total = irqtime->total;
} while (__u64_stats_fetch_retry(&irqtime->sync, seq));
return total;
}
#else /* !CONFIG_IRQ_TIME_ACCOUNTING: */
static inline int irqtime_enabled(void)
{
return 0;
}
#endif /* !CONFIG_IRQ_TIME_ACCOUNTING */
#ifdef CONFIG_CPU_FREQ
DECLARE_PER_CPU(struct update_util_data __rcu *, cpufreq_update_util_data);
/**
* cpufreq_update_util - Take a note about CPU utilization changes.
* @rq: Runqueue to carry out the update for.
* @flags: Update reason flags.
*
* This function is called by the scheduler on the CPU whose utilization is
* being updated.
*
* It can only be called from RCU-sched read-side critical sections.
*
* The way cpufreq is currently arranged requires it to evaluate the CPU
* performance state (frequency/voltage) on a regular basis to prevent it from
* being stuck in a completely inadequate performance level for too long.
* That is not guaranteed to happen if the updates are only triggered from CFS
* and DL, though, because they may not be coming in if only RT tasks are
* active all the time (or there are RT tasks only).
*
* As a workaround for that issue, this function is called periodically by the
* RT sched class to trigger extra cpufreq updates to prevent it from stalling,
* but that really is a band-aid. Going forward it should be replaced with
* solutions targeted more specifically at RT tasks.
*/
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
{
struct update_util_data *data;
data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data,
cpu_of(rq)));
if (data)
data->func(data, rq_clock(rq), flags);
}
#else /* !CONFIG_CPU_FREQ: */
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) { }
#endif /* !CONFIG_CPU_FREQ */
#ifdef arch_scale_freq_capacity
# ifndef arch_scale_freq_invariant
# define arch_scale_freq_invariant() true
# endif
#else
# define arch_scale_freq_invariant() false
#endif
unsigned long effective_cpu_util(int cpu, unsigned long util_cfs,
unsigned long *min,
unsigned long *max);
unsigned long sugov_effective_cpu_perf(int cpu, unsigned long actual,
unsigned long min,
unsigned long max);
/*
* Verify the fitness of task @p to run on @cpu taking into account the
* CPU original capacity and the runtime/deadline ratio of the task.
*
* The function will return true if the original capacity of @cpu is
* greater than or equal to task's deadline density right shifted by
* (BW_SHIFT - SCHED_CAPACITY_SHIFT) and false otherwise.
*/
static inline bool dl_task_fits_capacity(struct task_struct *p, int cpu)
{
unsigned long cap = arch_scale_cpu_capacity(cpu);
return cap >= p->dl.dl_density >> (BW_SHIFT - SCHED_CAPACITY_SHIFT);
}
static inline unsigned long cpu_bw_dl(struct rq *rq)
{
return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT;
}
static inline unsigned long cpu_util_dl(struct rq *rq)
{
return READ_ONCE(rq->avg_dl.util_avg);
}
extern unsigned long cpu_util_cfs(int cpu);
extern unsigned long cpu_util_cfs_boost(int cpu);
static inline unsigned long cpu_util_rt(struct rq *rq)
{
return READ_ONCE(rq->avg_rt.util_avg);
}
#ifdef CONFIG_UCLAMP_TASK
unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
/*
* When uclamp is compiled in, the aggregation at rq level is 'turned off'
* by default in the fast path and only gets turned on once userspace performs
* an operation that requires it.
*
* Returns true if userspace opted-in to use uclamp and aggregation at rq level
* hence is active.
*/
static inline bool uclamp_is_used(void)
{
return static_branch_likely(&sched_uclamp_used);
}
/*
* Enabling static branches would get the cpus_read_lock(),
* check whether uclamp_is_used before enable it to avoid always
* calling cpus_read_lock(). Because we never disable this
* static key once enable it.
*/
static inline void sched_uclamp_enable(void)
{
if (!uclamp_is_used())
static_branch_enable(&sched_uclamp_used);
}
static inline unsigned long uclamp_rq_get(struct rq *rq,
enum uclamp_id clamp_id)
{
return READ_ONCE(rq->uclamp[clamp_id].value);
}
static inline void uclamp_rq_set(struct rq *rq, enum uclamp_id clamp_id,
unsigned int value)
{
WRITE_ONCE(rq->uclamp[clamp_id].value, value);
}
static inline bool uclamp_rq_is_idle(struct rq *rq)
{
return rq->uclamp_flags & UCLAMP_FLAG_IDLE;
}
/* Is the rq being capped/throttled by uclamp_max? */
static inline bool uclamp_rq_is_capped(struct rq *rq)
{
unsigned long rq_util;
unsigned long max_util;
if (!uclamp_is_used())
return false;
rq_util = cpu_util_cfs(cpu_of(rq)) + cpu_util_rt(rq);
max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
return max_util != SCHED_CAPACITY_SCALE && rq_util >= max_util;
}
#define for_each_clamp_id(clamp_id) \
for ((clamp_id) = 0; (clamp_id) < UCLAMP_CNT; (clamp_id)++)
extern unsigned int sysctl_sched_uclamp_util_min_rt_default;
static inline unsigned int uclamp_none(enum uclamp_id clamp_id)
{
if (clamp_id == UCLAMP_MIN)
return 0;
return SCHED_CAPACITY_SCALE;
}
/* Integer rounded range for each bucket */
#define UCLAMP_BUCKET_DELTA DIV_ROUND_CLOSEST(SCHED_CAPACITY_SCALE, UCLAMP_BUCKETS)
static inline unsigned int uclamp_bucket_id(unsigned int clamp_value)
{
return min_t(unsigned int, clamp_value / UCLAMP_BUCKET_DELTA, UCLAMP_BUCKETS - 1);
}
static inline void
uclamp_se_set(struct uclamp_se *uc_se, unsigned int value, bool user_defined)
{
uc_se->value = value;
uc_se->bucket_id = uclamp_bucket_id(value);
uc_se->user_defined = user_defined;
}
#else /* !CONFIG_UCLAMP_TASK: */
static inline unsigned long
uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
{
if (clamp_id == UCLAMP_MIN)
return 0;
return SCHED_CAPACITY_SCALE;
}
static inline bool uclamp_rq_is_capped(struct rq *rq) { return false; }
static inline bool uclamp_is_used(void)
{
return false;
}
static inline void sched_uclamp_enable(void) {}
static inline unsigned long
uclamp_rq_get(struct rq *rq, enum uclamp_id clamp_id)
{
if (clamp_id == UCLAMP_MIN)
return 0;
return SCHED_CAPACITY_SCALE;
}
static inline void
uclamp_rq_set(struct rq *rq, enum uclamp_id clamp_id, unsigned int value)
{
}
static inline bool uclamp_rq_is_idle(struct rq *rq)
{
return false;
}
#endif /* !CONFIG_UCLAMP_TASK */
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
static inline unsigned long cpu_util_irq(struct rq *rq)
{
return READ_ONCE(rq->avg_irq.util_avg);
}
static inline
unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
{
util *= (max - irq);
util /= max;
return util;
}
#else /* !CONFIG_HAVE_SCHED_AVG_IRQ: */
static inline unsigned long cpu_util_irq(struct rq *rq)
{
return 0;
}
static inline
unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
{
return util;
}
#endif /* !CONFIG_HAVE_SCHED_AVG_IRQ */
extern void __setparam_fair(struct task_struct *p, const struct sched_attr *attr);
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
#define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))
DECLARE_STATIC_KEY_FALSE(sched_energy_present);
static inline bool sched_energy_enabled(void)
{
return static_branch_unlikely(&sched_energy_present);
}
#else /* !(CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL): */
#define perf_domain_span(pd) NULL
static inline bool sched_energy_enabled(void) { return false; }
#endif /* !(CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL) */
#ifdef CONFIG_MEMBARRIER
/*
* The scheduler provides memory barriers required by membarrier between:
* - prior user-space memory accesses and store to rq->membarrier_state,
* - store to rq->membarrier_state and following user-space memory accesses.
* In the same way it provides those guarantees around store to rq->curr.
*/
static inline void membarrier_switch_mm(struct rq *rq,
struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
int membarrier_state;
if (prev_mm == next_mm)
return;
membarrier_state = atomic_read(&next_mm->membarrier_state);
if (READ_ONCE(rq->membarrier_state) == membarrier_state)
return;
WRITE_ONCE(rq->membarrier_state, membarrier_state);
}
#else /* !CONFIG_MEMBARRIER: */
static inline void membarrier_switch_mm(struct rq *rq,
struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
}
#endif /* !CONFIG_MEMBARRIER */
static inline bool is_per_cpu_kthread(struct task_struct *p)
{
if (!(p->flags & PF_KTHREAD))
return false;
if (p->nr_cpus_allowed != 1)
return false;
return true;
}
extern void swake_up_all_locked(struct swait_queue_head *q);
extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
extern int try_to_wake_up(struct task_struct *tsk, unsigned int state, int wake_flags);
#ifdef CONFIG_PREEMPT_DYNAMIC
extern int preempt_dynamic_mode;
extern int sched_dynamic_mode(const char *str);
extern void sched_dynamic_update(int mode);
#endif
extern const char *preempt_modes[];
#ifdef CONFIG_SCHED_MM_CID
static __always_inline bool cid_on_cpu(unsigned int cid)
{
return cid & MM_CID_ONCPU;
}
static __always_inline bool cid_in_transit(unsigned int cid)
{
return cid & MM_CID_TRANSIT;
}
static __always_inline unsigned int cpu_cid_to_cid(unsigned int cid)
{
return cid & ~MM_CID_ONCPU;
}
static __always_inline unsigned int cid_to_cpu_cid(unsigned int cid)
{
return cid | MM_CID_ONCPU;
}
static __always_inline unsigned int cid_to_transit_cid(unsigned int cid)
{
return cid | MM_CID_TRANSIT;
}
static __always_inline unsigned int cid_from_transit_cid(unsigned int cid)
{
return cid & ~MM_CID_TRANSIT;
}
static __always_inline bool cid_on_task(unsigned int cid)
{
/* True if none of the MM_CID_ONCPU, MM_CID_TRANSIT, MM_CID_UNSET bits is set */
return cid < MM_CID_TRANSIT;
}
static __always_inline void mm_drop_cid(struct mm_struct *mm, unsigned int cid)
{
clear_bit(cid, mm_cidmask(mm));
}
static __always_inline void mm_unset_cid_on_task(struct task_struct *t)
{
unsigned int cid = t->mm_cid.cid;
t->mm_cid.cid = MM_CID_UNSET;
if (cid_on_task(cid))
mm_drop_cid(t->mm, cid);
}
static __always_inline void mm_drop_cid_on_cpu(struct mm_struct *mm, struct mm_cid_pcpu *pcp)
{
/* Clear the ONCPU bit, but do not set UNSET in the per CPU storage */
if (cid_on_cpu(pcp->cid)) {
pcp->cid = cpu_cid_to_cid(pcp->cid);
mm_drop_cid(mm, pcp->cid);
}
}
static inline unsigned int __mm_get_cid(struct mm_struct *mm, unsigned int max_cids)
{
unsigned int cid = find_first_zero_bit(mm_cidmask(mm), max_cids);
if (cid >= max_cids)
return MM_CID_UNSET;
if (test_and_set_bit(cid, mm_cidmask(mm)))
return MM_CID_UNSET;
return cid;
}
static inline unsigned int mm_get_cid(struct mm_struct *mm)
{
unsigned int cid = __mm_get_cid(mm, READ_ONCE(mm->mm_cid.max_cids));
while (cid == MM_CID_UNSET) {
cpu_relax();
cid = __mm_get_cid(mm, num_possible_cpus());
}
return cid;
}
static inline unsigned int mm_cid_converge(struct mm_struct *mm, unsigned int orig_cid,
unsigned int max_cids)
{
unsigned int new_cid, cid = cpu_cid_to_cid(orig_cid);
/* Is it in the optimal CID space? */
if (likely(cid < max_cids))
return orig_cid;
/* Try to find one in the optimal space. Otherwise keep the provided. */
new_cid = __mm_get_cid(mm, max_cids);
if (new_cid != MM_CID_UNSET) {
mm_drop_cid(mm, cid);
/* Preserve the ONCPU mode of the original CID */
return new_cid | (orig_cid & MM_CID_ONCPU);
}
return orig_cid;
}
static __always_inline void mm_cid_update_task_cid(struct task_struct *t, unsigned int cid)
{
if (t->mm_cid.cid != cid) {
t->mm_cid.cid = cid;
rseq_sched_set_ids_changed(t);
}
}
static __always_inline void mm_cid_update_pcpu_cid(struct mm_struct *mm, unsigned int cid)
{
__this_cpu_write(mm->mm_cid.pcpu->cid, cid);
}
static __always_inline void mm_cid_from_cpu(struct task_struct *t, unsigned int cpu_cid,
unsigned int mode)
{
unsigned int max_cids, tcid = t->mm_cid.cid;
struct mm_struct *mm = t->mm;
max_cids = READ_ONCE(mm->mm_cid.max_cids);
/* Optimize for the common case where both have the ONCPU bit set */
if (likely(cid_on_cpu(cpu_cid & tcid))) {
if (likely(cpu_cid_to_cid(cpu_cid) < max_cids)) {
mm_cid_update_task_cid(t, cpu_cid);
return;
}
/* Try to converge into the optimal CID space */
cpu_cid = mm_cid_converge(mm, cpu_cid, max_cids);
} else {
/* Hand over or drop the task owned CID */
if (cid_on_task(tcid)) {
if (cid_on_cpu(cpu_cid))
mm_unset_cid_on_task(t);
else
cpu_cid = cid_to_cpu_cid(tcid);
}
/* Still nothing, allocate a new one */
if (!cid_on_cpu(cpu_cid))
cpu_cid = cid_to_cpu_cid(mm_get_cid(mm));
/* Handle the transition mode flag if required */
if (mode & MM_CID_TRANSIT)
cpu_cid = cpu_cid_to_cid(cpu_cid) | MM_CID_TRANSIT;
}
mm_cid_update_pcpu_cid(mm, cpu_cid);
mm_cid_update_task_cid(t, cpu_cid);
}
static __always_inline void mm_cid_from_task(struct task_struct *t, unsigned int cpu_cid,
unsigned int mode)
{
unsigned int max_cids, tcid = t->mm_cid.cid;
struct mm_struct *mm = t->mm;
max_cids = READ_ONCE(mm->mm_cid.max_cids);
/* Optimize for the common case, where both have the ONCPU bit clear */
if (likely(cid_on_task(tcid | cpu_cid))) {
if (likely(tcid < max_cids)) {
mm_cid_update_pcpu_cid(mm, tcid);
return;
}
/* Try to converge into the optimal CID space */
tcid = mm_cid_converge(mm, tcid, max_cids);
} else {
/* Hand over or drop the CPU owned CID */
if (cid_on_cpu(cpu_cid)) {
if (cid_on_task(tcid))
mm_drop_cid_on_cpu(mm, this_cpu_ptr(mm->mm_cid.pcpu));
else
tcid = cpu_cid_to_cid(cpu_cid);
}
/* Still nothing, allocate a new one */
if (!cid_on_task(tcid))
tcid = mm_get_cid(mm);
/* Set the transition mode flag if required */
tcid |= mode & MM_CID_TRANSIT;
}
mm_cid_update_pcpu_cid(mm, tcid);
mm_cid_update_task_cid(t, tcid);
}
static __always_inline void mm_cid_schedin(struct task_struct *next)
{
struct mm_struct *mm = next->mm;
unsigned int cpu_cid, mode;
if (!next->mm_cid.active)
return;
cpu_cid = __this_cpu_read(mm->mm_cid.pcpu->cid);
mode = READ_ONCE(mm->mm_cid.mode);
if (likely(!cid_on_cpu(mode)))
mm_cid_from_task(next, cpu_cid, mode);
else
mm_cid_from_cpu(next, cpu_cid, mode);
}
static __always_inline void mm_cid_schedout(struct task_struct *prev)
{
struct mm_struct *mm = prev->mm;
unsigned int mode, cid;
/* During mode transitions CIDs are temporary and need to be dropped */
if (likely(!cid_in_transit(prev->mm_cid.cid)))
return;
mode = READ_ONCE(mm->mm_cid.mode);
cid = cid_from_transit_cid(prev->mm_cid.cid);
/*
* If transition mode is done, transfer ownership when the CID is
* within the convergence range to optimize the next schedule in.
*/
if (!cid_in_transit(mode) && cid < READ_ONCE(mm->mm_cid.max_cids)) {
if (cid_on_cpu(mode))
cid = cid_to_cpu_cid(cid);
/* Update both so that the next schedule in goes into the fast path */
mm_cid_update_pcpu_cid(mm, cid);
prev->mm_cid.cid = cid;
} else {
mm_drop_cid(mm, cid);
prev->mm_cid.cid = MM_CID_UNSET;
}
}
static inline void mm_cid_switch_to(struct task_struct *prev, struct task_struct *next)
{
mm_cid_schedout(prev);
mm_cid_schedin(next);
}
#else /* !CONFIG_SCHED_MM_CID: */
static inline void mm_cid_switch_to(struct task_struct *prev, struct task_struct *next) { }
#endif /* !CONFIG_SCHED_MM_CID */
#ifdef CONFIG_SCHED_CACHE
DECLARE_STATIC_KEY_FALSE(sched_cache_present);
DECLARE_STATIC_KEY_FALSE(sched_cache_active);
extern int sysctl_sched_cache_user;
extern unsigned int llc_aggr_tolerance;
extern unsigned int llc_epoch_period;
extern unsigned int llc_epoch_affinity_timeout;
extern unsigned int llc_imb_pct;
extern unsigned int llc_overaggr_pct;
static inline bool sched_cache_enabled(void)
{
return static_branch_unlikely(&sched_cache_active);
}
extern void sched_cache_active_set(void);
#endif
void sched_domains_free_llc_id(int cpu);
extern void init_sched_mm(struct task_struct *p);
extern u64 avg_vruntime(struct cfs_rq *cfs_rq);
extern int entity_eligible(struct cfs_rq *cfs_rq, struct sched_entity *se);
static inline
void move_queued_task_locked(struct rq *src_rq, struct rq *dst_rq, struct task_struct *task)
{
lockdep_assert_rq_held(src_rq);
lockdep_assert_rq_held(dst_rq);
deactivate_task(src_rq, task, 0);
set_task_cpu(task, dst_rq->cpu);
activate_task(dst_rq, task, 0);
wakeup_preempt(dst_rq, task, 0);
}
static inline
bool task_is_pushable(struct rq *rq, struct task_struct *p, int cpu)
{
if (!task_on_cpu(rq, p) &&
cpumask_test_cpu(cpu, &p->cpus_mask))
return true;
return false;
}
#ifdef CONFIG_RT_MUTEXES
static inline int __rt_effective_prio(struct task_struct *pi_task, int prio)
{
if (pi_task)
prio = min(prio, pi_task->prio);
return prio;
}
static inline int rt_effective_prio(struct task_struct *p, int prio)
{
struct task_struct *pi_task = rt_mutex_get_top_task(p);
return __rt_effective_prio(pi_task, prio);
}
#else /* !CONFIG_RT_MUTEXES: */
static inline int rt_effective_prio(struct task_struct *p, int prio)
{
return prio;
}
#endif /* !CONFIG_RT_MUTEXES */
extern int __sched_setscheduler(struct task_struct *p, const struct sched_attr *attr, bool user, bool pi);
extern int __sched_setaffinity(struct task_struct *p, struct affinity_context *ctx);
extern const struct sched_class *__setscheduler_class(int policy, int prio);
extern void set_load_weight(struct task_struct *p, bool update_load);
extern void enqueue_task(struct rq *rq, struct task_struct *p, int flags);
extern bool dequeue_task(struct rq *rq, struct task_struct *p, int flags);
extern struct balance_callback *splice_balance_callbacks(struct rq *rq);
extern void __balance_callbacks(struct rq *rq, struct rq_flags *rf);
extern void balance_callbacks(struct rq *rq, struct balance_callback *head);
/*
* The 'sched_change' pattern is the safe, easy and slow way of changing a
* task's scheduling properties. It dequeues a task, such that the scheduler
* is fully unaware of it; at which point its properties can be modified;
* after which it is enqueued again.
*
* Typically this must be called while holding task_rq_lock, since most/all
* properties are serialized under those locks. There are currently two
* exceptions to this rule in sched/ext which only hold rq->lock: scx_bypass()
* and rq_offline_scx().
*/
/*
* This structure is a temporary, used to preserve/convey the queueing state
* of the task between sched_change_begin() and sched_change_end(). Ensuring
* the task's queueing state is idempotent across the operation.
*/
struct sched_change_ctx {
u64 prio;
struct task_struct *p;
const struct sched_class *class;
int flags;
bool queued;
bool running;
};
struct sched_change_ctx *sched_change_begin(struct task_struct *p, unsigned int flags);
void sched_change_end(struct sched_change_ctx *ctx);
DEFINE_CLASS(sched_change, struct sched_change_ctx *,
sched_change_end(_T),
sched_change_begin(p, flags),
struct task_struct *p, unsigned int flags)
DEFINE_CLASS_IS_UNCONDITIONAL(sched_change)
#include "ext/ext.h"
#endif /* _KERNEL_SCHED_SCHED_H */