#include <linux/energy_model.h>
#include <linux/mmap_lock.h>
#include <linux/hugetlb_inline.h>
#include <linux/jiffies.h>
#include <linux/mm_api.h>
#include <linux/highmem.h>
#include <linux/spinlock_api.h>
#include <linux/cpumask_api.h>
#include <linux/lockdep_api.h>
#include <linux/softirq.h>
#include <linux/refcount_api.h>
#include <linux/topology.h>
#include <linux/sched/clock.h>
#include <linux/sched/cond_resched.h>
#include <linux/sched/cputime.h>
#include <linux/sched/isolation.h>
#include <linux/sched/nohz.h>
#include <linux/cpuidle.h>
#include <linux/interrupt.h>
#include <linux/memory-tiers.h>
#include <linux/mempolicy.h>
#include <linux/mutex_api.h>
#include <linux/profile.h>
#include <linux/psi.h>
#include <linux/ratelimit.h>
#include <linux/task_work.h>
#include <linux/rbtree_augmented.h>
#include <asm/switch_to.h>
#include <linux/sched/cond_resched.h>
#include "sched.h"
#include "stats.h"
#include "autogroup.h"
unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
unsigned int sysctl_sched_base_slice = 750000ULL;
static unsigned int normalized_sysctl_sched_base_slice = 750000ULL;
unsigned int sysctl_sched_child_runs_first __read_mostly;
const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
int sched_thermal_decay_shift;
static int __init setup_sched_thermal_decay_shift(char *str)
{
int _shift = 0;
if (kstrtoint(str, 0, &_shift))
pr_warn("Unable to set scheduler thermal pressure decay shift parameter\n");
sched_thermal_decay_shift = clamp(_shift, 0, 10);
return 1;
}
__setup("sched_thermal_decay_shift=", setup_sched_thermal_decay_shift);
#ifdef CONFIG_SMP
int __weak arch_asym_cpu_priority(int cpu)
{
return -cpu;
}
#define fits_capacity(cap, max) ((cap) * 1280 < (max) * 1024)
#define capacity_greater(cap1, cap2) ((cap1) * 1024 > (cap2) * 1078)
#endif
#ifdef CONFIG_CFS_BANDWIDTH
static unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
#endif
#ifdef CONFIG_NUMA_BALANCING
static unsigned int sysctl_numa_balancing_promote_rate_limit = 65536;
#endif
#ifdef CONFIG_SYSCTL
static struct ctl_table sched_fair_sysctls[] = {
{
.procname = "sched_child_runs_first",
.data = &sysctl_sched_child_runs_first,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_CFS_BANDWIDTH
{
.procname = "sched_cfs_bandwidth_slice_us",
.data = &sysctl_sched_cfs_bandwidth_slice,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_NUMA_BALANCING
{
.procname = "numa_balancing_promote_rate_limit_MBps",
.data = &sysctl_numa_balancing_promote_rate_limit,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
},
#endif /* CONFIG_NUMA_BALANCING */
{}
};
static int __init sched_fair_sysctl_init(void)
{
register_sysctl_init("kernel", sched_fair_sysctls);
return 0;
}
late_initcall(sched_fair_sysctl_init);
#endif
static inline void update_load_add(struct load_weight *lw, unsigned long inc)
{
lw->weight += inc;
lw->inv_weight = 0;
}
static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
{
lw->weight -= dec;
lw->inv_weight = 0;
}
static inline void update_load_set(struct load_weight *lw, unsigned long w)
{
lw->weight = w;
lw->inv_weight = 0;
}
static unsigned int get_update_sysctl_factor(void)
{
unsigned int cpus = min_t(unsigned int, num_online_cpus(), 8);
unsigned int factor;
switch (sysctl_sched_tunable_scaling) {
case SCHED_TUNABLESCALING_NONE:
factor = 1;
break;
case SCHED_TUNABLESCALING_LINEAR:
factor = cpus;
break;
case SCHED_TUNABLESCALING_LOG:
default:
factor = 1 + ilog2(cpus);
break;
}
return factor;
}
static void update_sysctl(void)
{
unsigned int factor = get_update_sysctl_factor();
#define SET_SYSCTL(name) \
(sysctl_##name = (factor) * normalized_sysctl_##name)
SET_SYSCTL(sched_base_slice);
#undef SET_SYSCTL
}
void __init sched_init_granularity(void)
{
update_sysctl();
}
#define WMULT_CONST (~0U)
#define WMULT_SHIFT 32
static void __update_inv_weight(struct load_weight *lw)
{
unsigned long w;
if (likely(lw->inv_weight))
return;
w = scale_load_down(lw->weight);
if (BITS_PER_LONG > 32 && unlikely(w >= WMULT_CONST))
lw->inv_weight = 1;
else if (unlikely(!w))
lw->inv_weight = WMULT_CONST;
else
lw->inv_weight = WMULT_CONST / w;
}
static u64 __calc_delta(u64 delta_exec, unsigned long weight, struct load_weight *lw)
{
u64 fact = scale_load_down(weight);
u32 fact_hi = (u32)(fact >> 32);
int shift = WMULT_SHIFT;
int fs;
__update_inv_weight(lw);
if (unlikely(fact_hi)) {
fs = fls(fact_hi);
shift -= fs;
fact >>= fs;
}
fact = mul_u32_u32(fact, lw->inv_weight);
fact_hi = (u32)(fact >> 32);
if (fact_hi) {
fs = fls(fact_hi);
shift -= fs;
fact >>= fs;
}
return mul_u64_u32_shr(delta_exec, fact, shift);
}
static inline u64 calc_delta_fair(u64 delta, struct sched_entity *se)
{
if (unlikely(se->load.weight != NICE_0_LOAD))
delta = __calc_delta(delta, NICE_0_LOAD, &se->load);
return delta;
}
const struct sched_class fair_sched_class;
#ifdef CONFIG_FAIR_GROUP_SCHED
#define for_each_sched_entity(se) \
for (; se; se = se->parent)
static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
int cpu = cpu_of(rq);
if (cfs_rq->on_list)
return rq->tmp_alone_branch == &rq->leaf_cfs_rq_list;
cfs_rq->on_list = 1;
if (cfs_rq->tg->parent &&
cfs_rq->tg->parent->cfs_rq[cpu]->on_list) {
list_add_tail_rcu(&cfs_rq->leaf_cfs_rq_list,
&(cfs_rq->tg->parent->cfs_rq[cpu]->leaf_cfs_rq_list));
rq->tmp_alone_branch = &rq->leaf_cfs_rq_list;
return true;
}
if (!cfs_rq->tg->parent) {
list_add_tail_rcu(&cfs_rq->leaf_cfs_rq_list,
&rq->leaf_cfs_rq_list);
rq->tmp_alone_branch = &rq->leaf_cfs_rq_list;
return true;
}
list_add_rcu(&cfs_rq->leaf_cfs_rq_list, rq->tmp_alone_branch);
rq->tmp_alone_branch = &cfs_rq->leaf_cfs_rq_list;
return false;
}
static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
if (cfs_rq->on_list) {
struct rq *rq = rq_of(cfs_rq);
if (rq->tmp_alone_branch == &cfs_rq->leaf_cfs_rq_list)
rq->tmp_alone_branch = cfs_rq->leaf_cfs_rq_list.prev;
list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
cfs_rq->on_list = 0;
}
}
static inline void assert_list_leaf_cfs_rq(struct rq *rq)
{
SCHED_WARN_ON(rq->tmp_alone_branch != &rq->leaf_cfs_rq_list);
}
#define for_each_leaf_cfs_rq_safe(rq, cfs_rq, pos) \
list_for_each_entry_safe(cfs_rq, pos, &rq->leaf_cfs_rq_list, \
leaf_cfs_rq_list)
static inline struct cfs_rq *
is_same_group(struct sched_entity *se, struct sched_entity *pse)
{
if (se->cfs_rq == pse->cfs_rq)
return se->cfs_rq;
return NULL;
}
static inline struct sched_entity *parent_entity(const struct sched_entity *se)
{
return se->parent;
}
static void
find_matching_se(struct sched_entity **se, struct sched_entity **pse)
{
int se_depth, pse_depth;
se_depth = (*se)->depth;
pse_depth = (*pse)->depth;
while (se_depth > pse_depth) {
se_depth--;
*se = parent_entity(*se);
}
while (pse_depth > se_depth) {
pse_depth--;
*pse = parent_entity(*pse);
}
while (!is_same_group(*se, *pse)) {
*se = parent_entity(*se);
*pse = parent_entity(*pse);
}
}
static int tg_is_idle(struct task_group *tg)
{
return tg->idle > 0;
}
static int cfs_rq_is_idle(struct cfs_rq *cfs_rq)
{
return cfs_rq->idle > 0;
}
static int se_is_idle(struct sched_entity *se)
{
if (entity_is_task(se))
return task_has_idle_policy(task_of(se));
return cfs_rq_is_idle(group_cfs_rq(se));
}
#else /* !CONFIG_FAIR_GROUP_SCHED */
#define for_each_sched_entity(se) \
for (; se; se = NULL)
static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
return true;
}
static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
}
static inline void assert_list_leaf_cfs_rq(struct rq *rq)
{
}
#define for_each_leaf_cfs_rq_safe(rq, cfs_rq, pos) \
for (cfs_rq = &rq->cfs, pos = NULL; cfs_rq; cfs_rq = pos)
static inline struct sched_entity *parent_entity(struct sched_entity *se)
{
return NULL;
}
static inline void
find_matching_se(struct sched_entity **se, struct sched_entity **pse)
{
}
static inline int tg_is_idle(struct task_group *tg)
{
return 0;
}
static int cfs_rq_is_idle(struct cfs_rq *cfs_rq)
{
return 0;
}
static int se_is_idle(struct sched_entity *se)
{
return 0;
}
#endif /* CONFIG_FAIR_GROUP_SCHED */
static __always_inline
void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec);
static inline u64 max_vruntime(u64 max_vruntime, u64 vruntime)
{
s64 delta = (s64)(vruntime - max_vruntime);
if (delta > 0)
max_vruntime = vruntime;
return max_vruntime;
}
static inline u64 min_vruntime(u64 min_vruntime, u64 vruntime)
{
s64 delta = (s64)(vruntime - min_vruntime);
if (delta < 0)
min_vruntime = vruntime;
return min_vruntime;
}
static inline bool entity_before(const struct sched_entity *a,
const struct sched_entity *b)
{
return (s64)(a->vruntime - b->vruntime) < 0;
}
static inline s64 entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
return (s64)(se->vruntime - cfs_rq->min_vruntime);
}
#define __node_2_se(node) \
rb_entry((node), struct sched_entity, run_node)
static void
avg_vruntime_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
unsigned long weight = scale_load_down(se->load.weight);
s64 key = entity_key(cfs_rq, se);
cfs_rq->avg_vruntime += key * weight;
cfs_rq->avg_load += weight;
}
static void
avg_vruntime_sub(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
unsigned long weight = scale_load_down(se->load.weight);
s64 key = entity_key(cfs_rq, se);
cfs_rq->avg_vruntime -= key * weight;
cfs_rq->avg_load -= weight;
}
static inline
void avg_vruntime_update(struct cfs_rq *cfs_rq, s64 delta)
{
cfs_rq->avg_vruntime -= cfs_rq->avg_load * delta;
}
u64 avg_vruntime(struct cfs_rq *cfs_rq)
{
struct sched_entity *curr = cfs_rq->curr;
s64 avg = cfs_rq->avg_vruntime;
long load = cfs_rq->avg_load;
if (curr && curr->on_rq) {
unsigned long weight = scale_load_down(curr->load.weight);
avg += entity_key(cfs_rq, curr) * weight;
load += weight;
}
if (load) {
if (avg < 0)
avg -= (load - 1);
avg = div_s64(avg, load);
}
return cfs_rq->min_vruntime + avg;
}
static void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
s64 lag, limit;
SCHED_WARN_ON(!se->on_rq);
lag = avg_vruntime(cfs_rq) - se->vruntime;
limit = calc_delta_fair(max_t(u64, 2*se->slice, TICK_NSEC), se);
se->vlag = clamp(lag, -limit, limit);
}
int entity_eligible(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
struct sched_entity *curr = cfs_rq->curr;
s64 avg = cfs_rq->avg_vruntime;
long load = cfs_rq->avg_load;
if (curr && curr->on_rq) {
unsigned long weight = scale_load_down(curr->load.weight);
avg += entity_key(cfs_rq, curr) * weight;
load += weight;
}
return avg >= entity_key(cfs_rq, se) * load;
}
static u64 __update_min_vruntime(struct cfs_rq *cfs_rq, u64 vruntime)
{
u64 min_vruntime = cfs_rq->min_vruntime;
s64 delta = (s64)(vruntime - min_vruntime);
if (delta > 0) {
avg_vruntime_update(cfs_rq, delta);
min_vruntime = vruntime;
}
return min_vruntime;
}
static void update_min_vruntime(struct cfs_rq *cfs_rq)
{
struct sched_entity *se = __pick_first_entity(cfs_rq);
struct sched_entity *curr = cfs_rq->curr;
u64 vruntime = cfs_rq->min_vruntime;
if (curr) {
if (curr->on_rq)
vruntime = curr->vruntime;
else
curr = NULL;
}
if (se) {
if (!curr)
vruntime = se->vruntime;
else
vruntime = min_vruntime(vruntime, se->vruntime);
}
u64_u32_store(cfs_rq->min_vruntime,
__update_min_vruntime(cfs_rq, vruntime));
}
static inline bool __entity_less(struct rb_node *a, const struct rb_node *b)
{
return entity_before(__node_2_se(a), __node_2_se(b));
}
#define deadline_gt(field, lse, rse) ({ (s64)((lse)->field - (rse)->field) > 0; })
static inline void __update_min_deadline(struct sched_entity *se, struct rb_node *node)
{
if (node) {
struct sched_entity *rse = __node_2_se(node);
if (deadline_gt(min_deadline, se, rse))
se->min_deadline = rse->min_deadline;
}
}
static inline bool min_deadline_update(struct sched_entity *se, bool exit)
{
u64 old_min_deadline = se->min_deadline;
struct rb_node *node = &se->run_node;
se->min_deadline = se->deadline;
__update_min_deadline(se, node->rb_right);
__update_min_deadline(se, node->rb_left);
return se->min_deadline == old_min_deadline;
}
RB_DECLARE_CALLBACKS(static, min_deadline_cb, struct sched_entity,
run_node, min_deadline, min_deadline_update);
static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
avg_vruntime_add(cfs_rq, se);
se->min_deadline = se->deadline;
rb_add_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
__entity_less, &min_deadline_cb);
}
static void __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
rb_erase_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
&min_deadline_cb);
avg_vruntime_sub(cfs_rq, se);
}
struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq)
{
struct rb_node *left = rb_first_cached(&cfs_rq->tasks_timeline);
if (!left)
return NULL;
return __node_2_se(left);
}
static struct sched_entity *__pick_eevdf(struct cfs_rq *cfs_rq)
{
struct rb_node *node = cfs_rq->tasks_timeline.rb_root.rb_node;
struct sched_entity *curr = cfs_rq->curr;
struct sched_entity *best = NULL;
struct sched_entity *best_left = NULL;
if (curr && (!curr->on_rq || !entity_eligible(cfs_rq, curr)))
curr = NULL;
best = curr;
if (sched_feat(RUN_TO_PARITY) && curr && curr->vlag == curr->deadline)
return curr;
while (node) {
struct sched_entity *se = __node_2_se(node);
if (!entity_eligible(cfs_rq, se)) {
node = node->rb_left;
continue;
}
if (!best || deadline_gt(deadline, best, se))
best = se;
if (node->rb_left) {
struct sched_entity *left = __node_2_se(node->rb_left);
if (!best_left || deadline_gt(min_deadline, best_left, left))
best_left = left;
if (left->min_deadline == se->min_deadline)
break;
}
if (se->deadline == se->min_deadline)
break;
node = node->rb_right;
}
if (!best_left || (s64)(best_left->min_deadline - best->deadline) > 0)
return best;
node = &best_left->run_node;
while (node) {
struct sched_entity *se = __node_2_se(node);
if (se->deadline == se->min_deadline)
return se;
if (node->rb_left &&
__node_2_se(node->rb_left)->min_deadline == se->min_deadline) {
node = node->rb_left;
continue;
}
node = node->rb_right;
}
return NULL;
}
static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq)
{
struct sched_entity *se = __pick_eevdf(cfs_rq);
if (!se) {
struct sched_entity *left = __pick_first_entity(cfs_rq);
if (left) {
pr_err("EEVDF scheduling fail, picking leftmost\n");
return left;
}
}
return se;
}
#ifdef CONFIG_SCHED_DEBUG
struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
{
struct rb_node *last = rb_last(&cfs_rq->tasks_timeline.rb_root);
if (!last)
return NULL;
return __node_2_se(last);
}
#ifdef CONFIG_SMP
int sched_update_scaling(void)
{
unsigned int factor = get_update_sysctl_factor();
#define WRT_SYSCTL(name) \
(normalized_sysctl_##name = sysctl_##name / (factor))
WRT_SYSCTL(sched_base_slice);
#undef WRT_SYSCTL
return 0;
}
#endif
#endif
static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se);
static void update_deadline(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
if ((s64)(se->vruntime - se->deadline) < 0)
return;
se->slice = sysctl_sched_base_slice;
se->deadline = se->vruntime + calc_delta_fair(se->slice, se);
if (cfs_rq->nr_running > 1) {
resched_curr(rq_of(cfs_rq));
clear_buddies(cfs_rq, se);
}
}
#include "pelt.h"
#ifdef CONFIG_SMP
static int select_idle_sibling(struct task_struct *p, int prev_cpu, int cpu);
static unsigned long task_h_load(struct task_struct *p);
static unsigned long capacity_of(int cpu);
void init_entity_runnable_average(struct sched_entity *se)
{
struct sched_avg *sa = &se->avg;
memset(sa, 0, sizeof(*sa));
if (entity_is_task(se))
sa->load_avg = scale_load_down(se->load.weight);
}
void post_init_entity_util_avg(struct task_struct *p)
{
struct sched_entity *se = &p->se;
struct cfs_rq *cfs_rq = cfs_rq_of(se);
struct sched_avg *sa = &se->avg;
long cpu_scale = arch_scale_cpu_capacity(cpu_of(rq_of(cfs_rq)));
long cap = (long)(cpu_scale - cfs_rq->avg.util_avg) / 2;
if (p->sched_class != &fair_sched_class) {
se->avg.last_update_time = cfs_rq_clock_pelt(cfs_rq);
return;
}
if (cap > 0) {
if (cfs_rq->avg.util_avg != 0) {
sa->util_avg = cfs_rq->avg.util_avg * se->load.weight;
sa->util_avg /= (cfs_rq->avg.load_avg + 1);
if (sa->util_avg > cap)
sa->util_avg = cap;
} else {
sa->util_avg = cap;
}
}
sa->runnable_avg = sa->util_avg;
}
#else /* !CONFIG_SMP */
void init_entity_runnable_average(struct sched_entity *se)
{
}
void post_init_entity_util_avg(struct task_struct *p)
{
}
static void update_tg_load_avg(struct cfs_rq *cfs_rq)
{
}
#endif /* CONFIG_SMP */
static void update_curr(struct cfs_rq *cfs_rq)
{
struct sched_entity *curr = cfs_rq->curr;
u64 now = rq_clock_task(rq_of(cfs_rq));
u64 delta_exec;
if (unlikely(!curr))
return;
delta_exec = now - curr->exec_start;
if (unlikely((s64)delta_exec <= 0))
return;
curr->exec_start = now;
if (schedstat_enabled()) {
struct sched_statistics *stats;
stats = __schedstats_from_se(curr);
__schedstat_set(stats->exec_max,
max(delta_exec, stats->exec_max));
}
curr->sum_exec_runtime += delta_exec;
schedstat_add(cfs_rq->exec_clock, delta_exec);
curr->vruntime += calc_delta_fair(delta_exec, curr);
update_deadline(cfs_rq, curr);
update_min_vruntime(cfs_rq);
if (entity_is_task(curr)) {
struct task_struct *curtask = task_of(curr);
trace_sched_stat_runtime(curtask, delta_exec, curr->vruntime);
cgroup_account_cputime(curtask, delta_exec);
account_group_exec_runtime(curtask, delta_exec);
}
account_cfs_rq_runtime(cfs_rq, delta_exec);
}
static void update_curr_fair(struct rq *rq)
{
update_curr(cfs_rq_of(&rq->curr->se));
}
static inline void
update_stats_wait_start_fair(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
struct sched_statistics *stats;
struct task_struct *p = NULL;
if (!schedstat_enabled())
return;
stats = __schedstats_from_se(se);
if (entity_is_task(se))
p = task_of(se);
__update_stats_wait_start(rq_of(cfs_rq), p, stats);
}
static inline void
update_stats_wait_end_fair(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
struct sched_statistics *stats;
struct task_struct *p = NULL;
if (!schedstat_enabled())
return;
stats = __schedstats_from_se(se);
if (unlikely(!schedstat_val(stats->wait_start)))
return;
if (entity_is_task(se))
p = task_of(se);
__update_stats_wait_end(rq_of(cfs_rq), p, stats);
}
static inline void
update_stats_enqueue_sleeper_fair(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
struct sched_statistics *stats;
struct task_struct *tsk = NULL;
if (!schedstat_enabled())
return;
stats = __schedstats_from_se(se);
if (entity_is_task(se))
tsk = task_of(se);
__update_stats_enqueue_sleeper(rq_of(cfs_rq), tsk, stats);
}
static inline void
update_stats_enqueue_fair(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
if (!schedstat_enabled())
return;
if (se != cfs_rq->curr)
update_stats_wait_start_fair(cfs_rq, se);
if (flags & ENQUEUE_WAKEUP)
update_stats_enqueue_sleeper_fair(cfs_rq, se);
}
static inline void
update_stats_dequeue_fair(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
if (!schedstat_enabled())
return;
if (se != cfs_rq->curr)
update_stats_wait_end_fair(cfs_rq, se);
if ((flags & DEQUEUE_SLEEP) && entity_is_task(se)) {
struct task_struct *tsk = task_of(se);
unsigned int state;
state = READ_ONCE(tsk->__state);
if (state & TASK_INTERRUPTIBLE)
__schedstat_set(tsk->stats.sleep_start,
rq_clock(rq_of(cfs_rq)));
if (state & TASK_UNINTERRUPTIBLE)
__schedstat_set(tsk->stats.block_start,
rq_clock(rq_of(cfs_rq)));
}
}
static inline void
update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
se->exec_start = rq_clock_task(rq_of(cfs_rq));
}
static inline bool is_core_idle(int cpu)
{
#ifdef CONFIG_SCHED_SMT
int sibling;
for_each_cpu(sibling, cpu_smt_mask(cpu)) {
if (cpu == sibling)
continue;
if (!idle_cpu(sibling))
return false;
}
#endif
return true;
}
#ifdef CONFIG_NUMA
#define NUMA_IMBALANCE_MIN 2
static inline long
adjust_numa_imbalance(int imbalance, int dst_running, int imb_numa_nr)
{
if (dst_running > imb_numa_nr)
return imbalance;
if (imbalance <= NUMA_IMBALANCE_MIN)
return 0;
return imbalance;
}
#endif /* CONFIG_NUMA */
#ifdef CONFIG_NUMA_BALANCING
unsigned int sysctl_numa_balancing_scan_period_min = 1000;
unsigned int sysctl_numa_balancing_scan_period_max = 60000;
unsigned int sysctl_numa_balancing_scan_size = 256;
unsigned int sysctl_numa_balancing_scan_delay = 1000;
unsigned int sysctl_numa_balancing_hot_threshold = MSEC_PER_SEC;
struct numa_group {
refcount_t refcount;
spinlock_t lock;
int nr_tasks;
pid_t gid;
int active_nodes;
struct rcu_head rcu;
unsigned long total_faults;
unsigned long max_faults_cpu;
unsigned long faults[];
};
static struct numa_group *deref_task_numa_group(struct task_struct *p)
{
return rcu_dereference_check(p->numa_group, p == current ||
(lockdep_is_held(__rq_lockp(task_rq(p))) && !READ_ONCE(p->on_cpu)));
}
static struct numa_group *deref_curr_numa_group(struct task_struct *p)
{
return rcu_dereference_protected(p->numa_group, p == current);
}
static inline unsigned long group_faults_priv(struct numa_group *ng);
static inline unsigned long group_faults_shared(struct numa_group *ng);
static unsigned int task_nr_scan_windows(struct task_struct *p)
{
unsigned long rss = 0;
unsigned long nr_scan_pages;
nr_scan_pages = sysctl_numa_balancing_scan_size << (20 - PAGE_SHIFT);
rss = get_mm_rss(p->mm);
if (!rss)
rss = nr_scan_pages;
rss = round_up(rss, nr_scan_pages);
return rss / nr_scan_pages;
}
#define MAX_SCAN_WINDOW 2560
static unsigned int task_scan_min(struct task_struct *p)
{
unsigned int scan_size = READ_ONCE(sysctl_numa_balancing_scan_size);
unsigned int scan, floor;
unsigned int windows = 1;
if (scan_size < MAX_SCAN_WINDOW)
windows = MAX_SCAN_WINDOW / scan_size;
floor = 1000 / windows;
scan = sysctl_numa_balancing_scan_period_min / task_nr_scan_windows(p);
return max_t(unsigned int, floor, scan);
}
static unsigned int task_scan_start(struct task_struct *p)
{
unsigned long smin = task_scan_min(p);
unsigned long period = smin;
struct numa_group *ng;
rcu_read_lock();
ng = rcu_dereference(p->numa_group);
if (ng) {
unsigned long shared = group_faults_shared(ng);
unsigned long private = group_faults_priv(ng);
period *= refcount_read(&ng->refcount);
period *= shared + 1;
period /= private + shared + 1;
}
rcu_read_unlock();
return max(smin, period);
}
static unsigned int task_scan_max(struct task_struct *p)
{
unsigned long smin = task_scan_min(p);
unsigned long smax;
struct numa_group *ng;
smax = sysctl_numa_balancing_scan_period_max / task_nr_scan_windows(p);
ng = deref_curr_numa_group(p);
if (ng) {
unsigned long shared = group_faults_shared(ng);
unsigned long private = group_faults_priv(ng);
unsigned long period = smax;
period *= refcount_read(&ng->refcount);
period *= shared + 1;
period /= private + shared + 1;
smax = max(smax, period);
}
return max(smin, smax);
}
static void account_numa_enqueue(struct rq *rq, struct task_struct *p)
{
rq->nr_numa_running += (p->numa_preferred_nid != NUMA_NO_NODE);
rq->nr_preferred_running += (p->numa_preferred_nid == task_node(p));
}
static void account_numa_dequeue(struct rq *rq, struct task_struct *p)
{
rq->nr_numa_running -= (p->numa_preferred_nid != NUMA_NO_NODE);
rq->nr_preferred_running -= (p->numa_preferred_nid == task_node(p));
}
#define NR_NUMA_HINT_FAULT_TYPES 2
#define NR_NUMA_HINT_FAULT_STATS (NR_NUMA_HINT_FAULT_TYPES * 2)
#define NR_NUMA_HINT_FAULT_BUCKETS (NR_NUMA_HINT_FAULT_STATS * 2)
pid_t task_numa_group_id(struct task_struct *p)
{
struct numa_group *ng;
pid_t gid = 0;
rcu_read_lock();
ng = rcu_dereference(p->numa_group);
if (ng)
gid = ng->gid;
rcu_read_unlock();
return gid;
}
static inline int task_faults_idx(enum numa_faults_stats s, int nid, int priv)
{
return NR_NUMA_HINT_FAULT_TYPES * (s * nr_node_ids + nid) + priv;
}
static inline unsigned long task_faults(struct task_struct *p, int nid)
{
if (!p->numa_faults)
return 0;
return p->numa_faults[task_faults_idx(NUMA_MEM, nid, 0)] +
p->numa_faults[task_faults_idx(NUMA_MEM, nid, 1)];
}
static inline unsigned long group_faults(struct task_struct *p, int nid)
{
struct numa_group *ng = deref_task_numa_group(p);
if (!ng)
return 0;
return ng->faults[task_faults_idx(NUMA_MEM, nid, 0)] +
ng->faults[task_faults_idx(NUMA_MEM, nid, 1)];
}
static inline unsigned long group_faults_cpu(struct numa_group *group, int nid)
{
return group->faults[task_faults_idx(NUMA_CPU, nid, 0)] +
group->faults[task_faults_idx(NUMA_CPU, nid, 1)];
}
static inline unsigned long group_faults_priv(struct numa_group *ng)
{
unsigned long faults = 0;
int node;
for_each_online_node(node) {
faults += ng->faults[task_faults_idx(NUMA_MEM, node, 1)];
}
return faults;
}
static inline unsigned long group_faults_shared(struct numa_group *ng)
{
unsigned long faults = 0;
int node;
for_each_online_node(node) {
faults += ng->faults[task_faults_idx(NUMA_MEM, node, 0)];
}
return faults;
}
#define ACTIVE_NODE_FRACTION 3
static bool numa_is_active_node(int nid, struct numa_group *ng)
{
return group_faults_cpu(ng, nid) * ACTIVE_NODE_FRACTION > ng->max_faults_cpu;
}
static unsigned long score_nearby_nodes(struct task_struct *p, int nid,
int lim_dist, bool task)
{
unsigned long score = 0;
int node, max_dist;
if (sched_numa_topology_type == NUMA_DIRECT)
return 0;
max_dist = READ_ONCE(sched_max_numa_distance);
for_each_online_node(node) {
unsigned long faults;
int dist = node_distance(nid, node);
if (dist >= max_dist || node == nid)
continue;
if (sched_numa_topology_type == NUMA_BACKPLANE && dist >= lim_dist)
continue;
if (task)
faults = task_faults(p, node);
else
faults = group_faults(p, node);
if (sched_numa_topology_type == NUMA_GLUELESS_MESH) {
faults *= (max_dist - dist);
faults /= (max_dist - LOCAL_DISTANCE);
}
score += faults;
}
return score;
}
static inline unsigned long task_weight(struct task_struct *p, int nid,
int dist)
{
unsigned long faults, total_faults;
if (!p->numa_faults)
return 0;
total_faults = p->total_numa_faults;
if (!total_faults)
return 0;
faults = task_faults(p, nid);
faults += score_nearby_nodes(p, nid, dist, true);
return 1000 * faults / total_faults;
}
static inline unsigned long group_weight(struct task_struct *p, int nid,
int dist)
{
struct numa_group *ng = deref_task_numa_group(p);
unsigned long faults, total_faults;
if (!ng)
return 0;
total_faults = ng->total_faults;
if (!total_faults)
return 0;
faults = group_faults(p, nid);
faults += score_nearby_nodes(p, nid, dist, false);
return 1000 * faults / total_faults;
}
static inline bool cpupid_valid(int cpupid)
{
return cpupid_to_cpu(cpupid) < nr_cpu_ids;
}
static bool pgdat_free_space_enough(struct pglist_data *pgdat)
{
int z;
unsigned long enough_wmark;
enough_wmark = max(1UL * 1024 * 1024 * 1024 >> PAGE_SHIFT,
pgdat->node_present_pages >> 4);
for (z = pgdat->nr_zones - 1; z >= 0; z--) {
struct zone *zone = pgdat->node_zones + z;
if (!populated_zone(zone))
continue;
if (zone_watermark_ok(zone, 0,
wmark_pages(zone, WMARK_PROMO) + enough_wmark,
ZONE_MOVABLE, 0))
return true;
}
return false;
}
static int numa_hint_fault_latency(struct page *page)
{
int last_time, time;
time = jiffies_to_msecs(jiffies);
last_time = xchg_page_access_time(page, time);
return (time - last_time) & PAGE_ACCESS_TIME_MASK;
}
static bool numa_promotion_rate_limit(struct pglist_data *pgdat,
unsigned long rate_limit, int nr)
{
unsigned long nr_cand;
unsigned int now, start;
now = jiffies_to_msecs(jiffies);
mod_node_page_state(pgdat, PGPROMOTE_CANDIDATE, nr);
nr_cand = node_page_state(pgdat, PGPROMOTE_CANDIDATE);
start = pgdat->nbp_rl_start;
if (now - start > MSEC_PER_SEC &&
cmpxchg(&pgdat->nbp_rl_start, start, now) == start)
pgdat->nbp_rl_nr_cand = nr_cand;
if (nr_cand - pgdat->nbp_rl_nr_cand >= rate_limit)
return true;
return false;
}
#define NUMA_MIGRATION_ADJUST_STEPS 16
static void numa_promotion_adjust_threshold(struct pglist_data *pgdat,
unsigned long rate_limit,
unsigned int ref_th)
{
unsigned int now, start, th_period, unit_th, th;
unsigned long nr_cand, ref_cand, diff_cand;
now = jiffies_to_msecs(jiffies);
th_period = sysctl_numa_balancing_scan_period_max;
start = pgdat->nbp_th_start;
if (now - start > th_period &&
cmpxchg(&pgdat->nbp_th_start, start, now) == start) {
ref_cand = rate_limit *
sysctl_numa_balancing_scan_period_max / MSEC_PER_SEC;
nr_cand = node_page_state(pgdat, PGPROMOTE_CANDIDATE);
diff_cand = nr_cand - pgdat->nbp_th_nr_cand;
unit_th = ref_th * 2 / NUMA_MIGRATION_ADJUST_STEPS;
th = pgdat->nbp_threshold ? : ref_th;
if (diff_cand > ref_cand * 11 / 10)
th = max(th - unit_th, unit_th);
else if (diff_cand < ref_cand * 9 / 10)
th = min(th + unit_th, ref_th * 2);
pgdat->nbp_th_nr_cand = nr_cand;
pgdat->nbp_threshold = th;
}
}
bool should_numa_migrate_memory(struct task_struct *p, struct page * page,
int src_nid, int dst_cpu)
{
struct numa_group *ng = deref_curr_numa_group(p);
int dst_nid = cpu_to_node(dst_cpu);
int last_cpupid, this_cpupid;
if (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING &&
!node_is_toptier(src_nid)) {
struct pglist_data *pgdat;
unsigned long rate_limit;
unsigned int latency, th, def_th;
pgdat = NODE_DATA(dst_nid);
if (pgdat_free_space_enough(pgdat)) {
pgdat->nbp_threshold = 0;
return true;
}
def_th = sysctl_numa_balancing_hot_threshold;
rate_limit = sysctl_numa_balancing_promote_rate_limit << \
(20 - PAGE_SHIFT);
numa_promotion_adjust_threshold(pgdat, rate_limit, def_th);
th = pgdat->nbp_threshold ? : def_th;
latency = numa_hint_fault_latency(page);
if (latency >= th)
return false;
return !numa_promotion_rate_limit(pgdat, rate_limit,
thp_nr_pages(page));
}
this_cpupid = cpu_pid_to_cpupid(dst_cpu, current->pid);
last_cpupid = page_cpupid_xchg_last(page, this_cpupid);
if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) &&
!node_is_toptier(src_nid) && !cpupid_valid(last_cpupid))
return false;
if ((p->numa_preferred_nid == NUMA_NO_NODE || p->numa_scan_seq <= 4) &&
(cpupid_pid_unset(last_cpupid) || cpupid_match_pid(p, last_cpupid)))
return true;
if (!cpupid_pid_unset(last_cpupid) &&
cpupid_to_nid(last_cpupid) != dst_nid)
return false;
if (cpupid_match_pid(p, last_cpupid))
return true;
if (!ng)
return true;
if (group_faults_cpu(ng, dst_nid) > group_faults_cpu(ng, src_nid) *
ACTIVE_NODE_FRACTION)
return true;
return group_faults_cpu(ng, dst_nid) * group_faults(p, src_nid) * 3 >
group_faults_cpu(ng, src_nid) * group_faults(p, dst_nid) * 4;
}
enum numa_type {
node_has_spare = 0,
node_fully_busy,
node_overloaded
};
struct numa_stats {
unsigned long load;
unsigned long runnable;
unsigned long util;
unsigned long compute_capacity;
unsigned int nr_running;
unsigned int weight;
enum numa_type node_type;
int idle_cpu;
};
struct task_numa_env {
struct task_struct *p;
int src_cpu, src_nid;
int dst_cpu, dst_nid;
int imb_numa_nr;
struct numa_stats src_stats, dst_stats;
int imbalance_pct;
int dist;
struct task_struct *best_task;
long best_imp;
int best_cpu;
};
static unsigned long cpu_load(struct rq *rq);
static unsigned long cpu_runnable(struct rq *rq);
static inline enum
numa_type numa_classify(unsigned int imbalance_pct,
struct numa_stats *ns)
{
if ((ns->nr_running > ns->weight) &&
(((ns->compute_capacity * 100) < (ns->util * imbalance_pct)) ||
((ns->compute_capacity * imbalance_pct) < (ns->runnable * 100))))
return node_overloaded;
if ((ns->nr_running < ns->weight) ||
(((ns->compute_capacity * 100) > (ns->util * imbalance_pct)) &&
((ns->compute_capacity * imbalance_pct) > (ns->runnable * 100))))
return node_has_spare;
return node_fully_busy;
}
#ifdef CONFIG_SCHED_SMT
static inline bool test_idle_cores(int cpu);
static inline int numa_idle_core(int idle_core, int cpu)
{
if (!static_branch_likely(&sched_smt_present) ||
idle_core >= 0 || !test_idle_cores(cpu))
return idle_core;
if (is_core_idle(cpu))
idle_core = cpu;
return idle_core;
}
#else
static inline int numa_idle_core(int idle_core, int cpu)
{
return idle_core;
}
#endif
static void update_numa_stats(struct task_numa_env *env,
struct numa_stats *ns, int nid,
bool find_idle)
{
int cpu, idle_core = -1;
memset(ns, 0, sizeof(*ns));
ns->idle_cpu = -1;
rcu_read_lock();
for_each_cpu(cpu, cpumask_of_node(nid)) {
struct rq *rq = cpu_rq(cpu);
ns->load += cpu_load(rq);
ns->runnable += cpu_runnable(rq);
ns->util += cpu_util_cfs(cpu);
ns->nr_running += rq->cfs.h_nr_running;
ns->compute_capacity += capacity_of(cpu);
if (find_idle && idle_core < 0 && !rq->nr_running && idle_cpu(cpu)) {
if (READ_ONCE(rq->numa_migrate_on) ||
!cpumask_test_cpu(cpu, env->p->cpus_ptr))
continue;
if (ns->idle_cpu == -1)
ns->idle_cpu = cpu;
idle_core = numa_idle_core(idle_core, cpu);
}
}
rcu_read_unlock();
ns->weight = cpumask_weight(cpumask_of_node(nid));
ns->node_type = numa_classify(env->imbalance_pct, ns);
if (idle_core >= 0)
ns->idle_cpu = idle_core;
}
static void task_numa_assign(struct task_numa_env *env,
struct task_struct *p, long imp)
{
struct rq *rq = cpu_rq(env->dst_cpu);
if (env->best_cpu != env->dst_cpu && xchg(&rq->numa_migrate_on, 1)) {
int cpu;
int start = env->dst_cpu;
for_each_cpu_wrap(cpu, cpumask_of_node(env->dst_nid), start + 1) {
if (cpu == env->best_cpu || !idle_cpu(cpu) ||
!cpumask_test_cpu(cpu, env->p->cpus_ptr)) {
continue;
}
env->dst_cpu = cpu;
rq = cpu_rq(env->dst_cpu);
if (!xchg(&rq->numa_migrate_on, 1))
goto assign;
}
return;
}
assign:
if (env->best_cpu != -1 && env->best_cpu != env->dst_cpu) {
rq = cpu_rq(env->best_cpu);
WRITE_ONCE(rq->numa_migrate_on, 0);
}
if (env->best_task)
put_task_struct(env->best_task);
if (p)
get_task_struct(p);
env->best_task = p;
env->best_imp = imp;
env->best_cpu = env->dst_cpu;
}
static bool load_too_imbalanced(long src_load, long dst_load,
struct task_numa_env *env)
{
long imb, old_imb;
long orig_src_load, orig_dst_load;
long src_capacity, dst_capacity;
src_capacity = env->src_stats.compute_capacity;
dst_capacity = env->dst_stats.compute_capacity;
imb = abs(dst_load * src_capacity - src_load * dst_capacity);
orig_src_load = env->src_stats.load;
orig_dst_load = env->dst_stats.load;
old_imb = abs(orig_dst_load * src_capacity - orig_src_load * dst_capacity);
return (imb > old_imb);
}
#define SMALLIMP 30
static bool task_numa_compare(struct task_numa_env *env,
long taskimp, long groupimp, bool maymove)
{
struct numa_group *cur_ng, *p_ng = deref_curr_numa_group(env->p);
struct rq *dst_rq = cpu_rq(env->dst_cpu);
long imp = p_ng ? groupimp : taskimp;
struct task_struct *cur;
long src_load, dst_load;
int dist = env->dist;
long moveimp = imp;
long load;
bool stopsearch = false;
if (READ_ONCE(dst_rq->numa_migrate_on))
return false;
rcu_read_lock();
cur = rcu_dereference(dst_rq->curr);
if (cur && ((cur->flags & PF_EXITING) || is_idle_task(cur)))
cur = NULL;
if (cur == env->p) {
stopsearch = true;
goto unlock;
}
if (!cur) {
if (maymove && moveimp >= env->best_imp)
goto assign;
else
goto unlock;
}
if (!cpumask_test_cpu(env->src_cpu, cur->cpus_ptr))
goto unlock;
if (env->best_task &&
env->best_task->numa_preferred_nid == env->src_nid &&
cur->numa_preferred_nid != env->src_nid) {
goto unlock;
}
cur_ng = rcu_dereference(cur->numa_group);
if (cur_ng == p_ng) {
if (env->dst_stats.node_type == node_has_spare)
goto unlock;
imp = taskimp + task_weight(cur, env->src_nid, dist) -
task_weight(cur, env->dst_nid, dist);
if (cur_ng)
imp -= imp / 16;
} else {
if (cur_ng && p_ng)
imp += group_weight(cur, env->src_nid, dist) -
group_weight(cur, env->dst_nid, dist);
else
imp += task_weight(cur, env->src_nid, dist) -
task_weight(cur, env->dst_nid, dist);
}
if (cur->numa_preferred_nid == env->dst_nid)
imp -= imp / 16;
if (cur->numa_preferred_nid == env->src_nid)
imp += imp / 8;
if (maymove && moveimp > imp && moveimp > env->best_imp) {
imp = moveimp;
cur = NULL;
goto assign;
}
if (env->best_task && cur->numa_preferred_nid == env->src_nid &&
env->best_task->numa_preferred_nid != env->src_nid) {
goto assign;
}
if (imp < SMALLIMP || imp <= env->best_imp + SMALLIMP / 2)
goto unlock;
load = task_h_load(env->p) - task_h_load(cur);
if (!load)
goto assign;
dst_load = env->dst_stats.load + load;
src_load = env->src_stats.load - load;
if (load_too_imbalanced(src_load, dst_load, env))
goto unlock;
assign:
if (!cur) {
int cpu = env->dst_stats.idle_cpu;
if (cpu < 0)
cpu = env->dst_cpu;
if (!idle_cpu(cpu) && env->best_cpu >= 0 &&
idle_cpu(env->best_cpu)) {
cpu = env->best_cpu;
}
env->dst_cpu = cpu;
}
task_numa_assign(env, cur, imp);
if (maymove && !cur && env->best_cpu >= 0 && idle_cpu(env->best_cpu))
stopsearch = true;
if (!maymove && env->best_task &&
env->best_task->numa_preferred_nid == env->src_nid) {
stopsearch = true;
}
unlock:
rcu_read_unlock();
return stopsearch;
}
static void task_numa_find_cpu(struct task_numa_env *env,
long taskimp, long groupimp)
{
bool maymove = false;
int cpu;
if (env->dst_stats.node_type == node_has_spare) {
unsigned int imbalance;
int src_running, dst_running;
src_running = env->src_stats.nr_running - 1;
dst_running = env->dst_stats.nr_running + 1;
imbalance = max(0, dst_running - src_running);
imbalance = adjust_numa_imbalance(imbalance, dst_running,
env->imb_numa_nr);
if (!imbalance) {
maymove = true;
if (env->dst_stats.idle_cpu >= 0) {
env->dst_cpu = env->dst_stats.idle_cpu;
task_numa_assign(env, NULL, 0);
return;
}
}
} else {
long src_load, dst_load, load;
load = task_h_load(env->p);
dst_load = env->dst_stats.load + load;
src_load = env->src_stats.load - load;
maymove = !load_too_imbalanced(src_load, dst_load, env);
}
for_each_cpu(cpu, cpumask_of_node(env->dst_nid)) {
if (!cpumask_test_cpu(cpu, env->p->cpus_ptr))
continue;
env->dst_cpu = cpu;
if (task_numa_compare(env, taskimp, groupimp, maymove))
break;
}
}
static int task_numa_migrate(struct task_struct *p)
{
struct task_numa_env env = {
.p = p,
.src_cpu = task_cpu(p),
.src_nid = task_node(p),
.imbalance_pct = 112,
.best_task = NULL,
.best_imp = 0,
.best_cpu = -1,
};
unsigned long taskweight, groupweight;
struct sched_domain *sd;
long taskimp, groupimp;
struct numa_group *ng;
struct rq *best_rq;
int nid, ret, dist;
rcu_read_lock();
sd = rcu_dereference(per_cpu(sd_numa, env.src_cpu));
if (sd) {
env.imbalance_pct = 100 + (sd->imbalance_pct - 100) / 2;
env.imb_numa_nr = sd->imb_numa_nr;
}
rcu_read_unlock();
if (unlikely(!sd)) {
sched_setnuma(p, task_node(p));
return -EINVAL;
}
env.dst_nid = p->numa_preferred_nid;
dist = env.dist = node_distance(env.src_nid, env.dst_nid);
taskweight = task_weight(p, env.src_nid, dist);
groupweight = group_weight(p, env.src_nid, dist);
update_numa_stats(&env, &env.src_stats, env.src_nid, false);
taskimp = task_weight(p, env.dst_nid, dist) - taskweight;
groupimp = group_weight(p, env.dst_nid, dist) - groupweight;
update_numa_stats(&env, &env.dst_stats, env.dst_nid, true);
task_numa_find_cpu(&env, taskimp, groupimp);
ng = deref_curr_numa_group(p);
if (env.best_cpu == -1 || (ng && ng->active_nodes > 1)) {
for_each_node_state(nid, N_CPU) {
if (nid == env.src_nid || nid == p->numa_preferred_nid)
continue;
dist = node_distance(env.src_nid, env.dst_nid);
if (sched_numa_topology_type == NUMA_BACKPLANE &&
dist != env.dist) {
taskweight = task_weight(p, env.src_nid, dist);
groupweight = group_weight(p, env.src_nid, dist);
}
taskimp = task_weight(p, nid, dist) - taskweight;
groupimp = group_weight(p, nid, dist) - groupweight;
if (taskimp < 0 && groupimp < 0)
continue;
env.dist = dist;
env.dst_nid = nid;
update_numa_stats(&env, &env.dst_stats, env.dst_nid, true);
task_numa_find_cpu(&env, taskimp, groupimp);
}
}
if (ng) {
if (env.best_cpu == -1)
nid = env.src_nid;
else
nid = cpu_to_node(env.best_cpu);
if (nid != p->numa_preferred_nid)
sched_setnuma(p, nid);
}
if (env.best_cpu == -1) {
trace_sched_stick_numa(p, env.src_cpu, NULL, -1);
return -EAGAIN;
}
best_rq = cpu_rq(env.best_cpu);
if (env.best_task == NULL) {
ret = migrate_task_to(p, env.best_cpu);
WRITE_ONCE(best_rq->numa_migrate_on, 0);
if (ret != 0)
trace_sched_stick_numa(p, env.src_cpu, NULL, env.best_cpu);
return ret;
}
ret = migrate_swap(p, env.best_task, env.best_cpu, env.src_cpu);
WRITE_ONCE(best_rq->numa_migrate_on, 0);
if (ret != 0)
trace_sched_stick_numa(p, env.src_cpu, env.best_task, env.best_cpu);
put_task_struct(env.best_task);
return ret;
}
static void numa_migrate_preferred(struct task_struct *p)
{
unsigned long interval = HZ;
if (unlikely(p->numa_preferred_nid == NUMA_NO_NODE || !p->numa_faults))
return;
interval = min(interval, msecs_to_jiffies(p->numa_scan_period) / 16);
p->numa_migrate_retry = jiffies + interval;
if (task_node(p) == p->numa_preferred_nid)
return;
task_numa_migrate(p);
}
static void numa_group_count_active_nodes(struct numa_group *numa_group)
{
unsigned long faults, max_faults = 0;
int nid, active_nodes = 0;
for_each_node_state(nid, N_CPU) {
faults = group_faults_cpu(numa_group, nid);
if (faults > max_faults)
max_faults = faults;
}
for_each_node_state(nid, N_CPU) {
faults = group_faults_cpu(numa_group, nid);
if (faults * ACTIVE_NODE_FRACTION > max_faults)
active_nodes++;
}
numa_group->max_faults_cpu = max_faults;
numa_group->active_nodes = active_nodes;
}
#define NUMA_PERIOD_SLOTS 10
#define NUMA_PERIOD_THRESHOLD 7
static void update_task_scan_period(struct task_struct *p,
unsigned long shared, unsigned long private)
{
unsigned int period_slot;
int lr_ratio, ps_ratio;
int diff;
unsigned long remote = p->numa_faults_locality[0];
unsigned long local = p->numa_faults_locality[1];
if (local + shared == 0 || p->numa_faults_locality[2]) {
p->numa_scan_period = min(p->numa_scan_period_max,
p->numa_scan_period << 1);
p->mm->numa_next_scan = jiffies +
msecs_to_jiffies(p->numa_scan_period);
return;
}
period_slot = DIV_ROUND_UP(p->numa_scan_period, NUMA_PERIOD_SLOTS);
lr_ratio = (local * NUMA_PERIOD_SLOTS) / (local + remote);
ps_ratio = (private * NUMA_PERIOD_SLOTS) / (private + shared);
if (ps_ratio >= NUMA_PERIOD_THRESHOLD) {
int slot = ps_ratio - NUMA_PERIOD_THRESHOLD;
if (!slot)
slot = 1;
diff = slot * period_slot;
} else if (lr_ratio >= NUMA_PERIOD_THRESHOLD) {
int slot = lr_ratio - NUMA_PERIOD_THRESHOLD;
if (!slot)
slot = 1;
diff = slot * period_slot;
} else {
int ratio = max(lr_ratio, ps_ratio);
diff = -(NUMA_PERIOD_THRESHOLD - ratio) * period_slot;
}
p->numa_scan_period = clamp(p->numa_scan_period + diff,
task_scan_min(p), task_scan_max(p));
memset(p->numa_faults_locality, 0, sizeof(p->numa_faults_locality));
}
static u64 numa_get_avg_runtime(struct task_struct *p, u64 *period)
{
u64 runtime, delta, now;
now = p->se.exec_start;
runtime = p->se.sum_exec_runtime;
if (p->last_task_numa_placement) {
delta = runtime - p->last_sum_exec_runtime;
*period = now - p->last_task_numa_placement;
if (unlikely((s64)*period < 0))
*period = 0;
} else {
delta = p->se.avg.load_sum;
*period = LOAD_AVG_MAX;
}
p->last_sum_exec_runtime = runtime;
p->last_task_numa_placement = now;
return delta;
}
static int preferred_group_nid(struct task_struct *p, int nid)
{
nodemask_t nodes;
int dist;
if (sched_numa_topology_type == NUMA_DIRECT)
return nid;
if (sched_numa_topology_type == NUMA_GLUELESS_MESH) {
unsigned long score, max_score = 0;
int node, max_node = nid;
dist = sched_max_numa_distance;
for_each_node_state(node, N_CPU) {
score = group_weight(p, node, dist);
if (score > max_score) {
max_score = score;
max_node = node;
}
}
return max_node;
}
nodes = node_states[N_CPU];
for (dist = sched_max_numa_distance; dist > LOCAL_DISTANCE; dist--) {
unsigned long max_faults = 0;
nodemask_t max_group = NODE_MASK_NONE;
int a, b;
if (!find_numa_distance(dist))
continue;
for_each_node_mask(a, nodes) {
unsigned long faults = 0;
nodemask_t this_group;
nodes_clear(this_group);
for_each_node_mask(b, nodes) {
if (node_distance(a, b) < dist) {
faults += group_faults(p, b);
node_set(b, this_group);
node_clear(b, nodes);
}
}
if (faults > max_faults) {
max_faults = faults;
max_group = this_group;
nid = a;
}
}
if (!max_faults)
break;
nodes = max_group;
}
return nid;
}
static void task_numa_placement(struct task_struct *p)
{
int seq, nid, max_nid = NUMA_NO_NODE;
unsigned long max_faults = 0;
unsigned long fault_types[2] = { 0, 0 };
unsigned long total_faults;
u64 runtime, period;
spinlock_t *group_lock = NULL;
struct numa_group *ng;
seq = READ_ONCE(p->mm->numa_scan_seq);
if (p->numa_scan_seq == seq)
return;
p->numa_scan_seq = seq;
p->numa_scan_period_max = task_scan_max(p);
total_faults = p->numa_faults_locality[0] +
p->numa_faults_locality[1];
runtime = numa_get_avg_runtime(p, &period);
ng = deref_curr_numa_group(p);
if (ng) {
group_lock = &ng->lock;
spin_lock_irq(group_lock);
}
for_each_online_node(nid) {
int mem_idx, membuf_idx, cpu_idx, cpubuf_idx;
unsigned long faults = 0, group_faults = 0;
int priv;
for (priv = 0; priv < NR_NUMA_HINT_FAULT_TYPES; priv++) {
long diff, f_diff, f_weight;
mem_idx = task_faults_idx(NUMA_MEM, nid, priv);
membuf_idx = task_faults_idx(NUMA_MEMBUF, nid, priv);
cpu_idx = task_faults_idx(NUMA_CPU, nid, priv);
cpubuf_idx = task_faults_idx(NUMA_CPUBUF, nid, priv);
diff = p->numa_faults[membuf_idx] - p->numa_faults[mem_idx] / 2;
fault_types[priv] += p->numa_faults[membuf_idx];
p->numa_faults[membuf_idx] = 0;
f_weight = div64_u64(runtime << 16, period + 1);
f_weight = (f_weight * p->numa_faults[cpubuf_idx]) /
(total_faults + 1);
f_diff = f_weight - p->numa_faults[cpu_idx] / 2;
p->numa_faults[cpubuf_idx] = 0;
p->numa_faults[mem_idx] += diff;
p->numa_faults[cpu_idx] += f_diff;
faults += p->numa_faults[mem_idx];
p->total_numa_faults += diff;
if (ng) {
ng->faults[mem_idx] += diff;
ng->faults[cpu_idx] += f_diff;
ng->total_faults += diff;
group_faults += ng->faults[mem_idx];
}
}
if (!ng) {
if (faults > max_faults) {
max_faults = faults;
max_nid = nid;
}
} else if (group_faults > max_faults) {
max_faults = group_faults;
max_nid = nid;
}
}
if (max_nid != NUMA_NO_NODE && !node_state(max_nid, N_CPU)) {
int near_nid = max_nid;
int distance, near_distance = INT_MAX;
for_each_node_state(nid, N_CPU) {
distance = node_distance(max_nid, nid);
if (distance < near_distance) {
near_nid = nid;
near_distance = distance;
}
}
max_nid = near_nid;
}
if (ng) {
numa_group_count_active_nodes(ng);
spin_unlock_irq(group_lock);
max_nid = preferred_group_nid(p, max_nid);
}
if (max_faults) {
if (max_nid != p->numa_preferred_nid)
sched_setnuma(p, max_nid);
}
update_task_scan_period(p, fault_types[0], fault_types[1]);
}
static inline int get_numa_group(struct numa_group *grp)
{
return refcount_inc_not_zero(&grp->refcount);
}
static inline void put_numa_group(struct numa_group *grp)
{
if (refcount_dec_and_test(&grp->refcount))
kfree_rcu(grp, rcu);
}
static void task_numa_group(struct task_struct *p, int cpupid, int flags,
int *priv)
{
struct numa_group *grp, *my_grp;
struct task_struct *tsk;
bool join = false;
int cpu = cpupid_to_cpu(cpupid);
int i;
if (unlikely(!deref_curr_numa_group(p))) {
unsigned int size = sizeof(struct numa_group) +
NR_NUMA_HINT_FAULT_STATS *
nr_node_ids * sizeof(unsigned long);
grp = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!grp)
return;
refcount_set(&grp->refcount, 1);
grp->active_nodes = 1;
grp->max_faults_cpu = 0;
spin_lock_init(&grp->lock);
grp->gid = p->pid;
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++)
grp->faults[i] = p->numa_faults[i];
grp->total_faults = p->total_numa_faults;
grp->nr_tasks++;
rcu_assign_pointer(p->numa_group, grp);
}
rcu_read_lock();
tsk = READ_ONCE(cpu_rq(cpu)->curr);
if (!cpupid_match_pid(tsk, cpupid))
goto no_join;
grp = rcu_dereference(tsk->numa_group);
if (!grp)
goto no_join;
my_grp = deref_curr_numa_group(p);
if (grp == my_grp)
goto no_join;
if (my_grp->nr_tasks > grp->nr_tasks)
goto no_join;
if (my_grp->nr_tasks == grp->nr_tasks && my_grp > grp)
goto no_join;
if (tsk->mm == current->mm)
join = true;
if (flags & TNF_SHARED)
join = true;
*priv = !join;
if (join && !get_numa_group(grp))
goto no_join;
rcu_read_unlock();
if (!join)
return;
WARN_ON_ONCE(irqs_disabled());
double_lock_irq(&my_grp->lock, &grp->lock);
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++) {
my_grp->faults[i] -= p->numa_faults[i];
grp->faults[i] += p->numa_faults[i];
}
my_grp->total_faults -= p->total_numa_faults;
grp->total_faults += p->total_numa_faults;
my_grp->nr_tasks--;
grp->nr_tasks++;
spin_unlock(&my_grp->lock);
spin_unlock_irq(&grp->lock);
rcu_assign_pointer(p->numa_group, grp);
put_numa_group(my_grp);
return;
no_join:
rcu_read_unlock();
return;
}
void task_numa_free(struct task_struct *p, bool final)
{
struct numa_group *grp = rcu_dereference_raw(p->numa_group);
unsigned long *numa_faults = p->numa_faults;
unsigned long flags;
int i;
if (!numa_faults)
return;
if (grp) {
spin_lock_irqsave(&grp->lock, flags);
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++)
grp->faults[i] -= p->numa_faults[i];
grp->total_faults -= p->total_numa_faults;
grp->nr_tasks--;
spin_unlock_irqrestore(&grp->lock, flags);
RCU_INIT_POINTER(p->numa_group, NULL);
put_numa_group(grp);
}
if (final) {
p->numa_faults = NULL;
kfree(numa_faults);
} else {
p->total_numa_faults = 0;
for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++)
numa_faults[i] = 0;
}
}
void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
{
struct task_struct *p = current;
bool migrated = flags & TNF_MIGRATED;
int cpu_node = task_node(current);
int local = !!(flags & TNF_FAULT_LOCAL);
struct numa_group *ng;
int priv;
if (!static_branch_likely(&sched_numa_balancing))
return;
if (!p->mm)
return;
if (!node_is_toptier(mem_node) &&
(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING ||
!cpupid_valid(last_cpupid)))
return;
if (unlikely(!p->numa_faults)) {
int size = sizeof(*p->numa_faults) *
NR_NUMA_HINT_FAULT_BUCKETS * nr_node_ids;
p->numa_faults = kzalloc(size, GFP_KERNEL|__GFP_NOWARN);
if (!p->numa_faults)
return;
p->total_numa_faults = 0;
memset(p->numa_faults_locality, 0, sizeof(p->numa_faults_locality));
}
if (unlikely(last_cpupid == (-1 & LAST_CPUPID_MASK))) {
priv = 1;
} else {
priv = cpupid_match_pid(p, last_cpupid);
if (!priv && !(flags & TNF_NO_GROUP))
task_numa_group(p, last_cpupid, flags, &priv);
}
ng = deref_curr_numa_group(p);
if (!priv && !local && ng && ng->active_nodes > 1 &&
numa_is_active_node(cpu_node, ng) &&
numa_is_active_node(mem_node, ng))
local = 1;
if (time_after(jiffies, p->numa_migrate_retry)) {
task_numa_placement(p);
numa_migrate_preferred(p);
}
if (migrated)
p->numa_pages_migrated += pages;
if (flags & TNF_MIGRATE_FAIL)
p->numa_faults_locality[2] += pages;
p->numa_faults[task_faults_idx(NUMA_MEMBUF, mem_node, priv)] += pages;
p->numa_faults[task_faults_idx(NUMA_CPUBUF, cpu_node, priv)] += pages;
p->numa_faults_locality[local] += pages;
}
static void reset_ptenuma_scan(struct task_struct *p)
{
WRITE_ONCE(p->mm->numa_scan_seq, READ_ONCE(p->mm->numa_scan_seq) + 1);
p->mm->numa_scan_offset = 0;
}
static bool vma_is_accessed(struct vm_area_struct *vma)
{
unsigned long pids;
if (READ_ONCE(current->mm->numa_scan_seq) < 2)
return true;
pids = vma->numab_state->access_pids[0] | vma->numab_state->access_pids[1];
return test_bit(hash_32(current->pid, ilog2(BITS_PER_LONG)), &pids);
}
#define VMA_PID_RESET_PERIOD (4 * sysctl_numa_balancing_scan_delay)
static void task_numa_work(struct callback_head *work)
{
unsigned long migrate, next_scan, now = jiffies;
struct task_struct *p = current;
struct mm_struct *mm = p->mm;
u64 runtime = p->se.sum_exec_runtime;
struct vm_area_struct *vma;
unsigned long start, end;
unsigned long nr_pte_updates = 0;
long pages, virtpages;
struct vma_iterator vmi;
SCHED_WARN_ON(p != container_of(work, struct task_struct, numa_work));
work->next = work;
if (p->flags & PF_EXITING)
return;
if (!mm->numa_next_scan) {
mm->numa_next_scan = now +
msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
}
migrate = mm->numa_next_scan;
if (time_before(now, migrate))
return;
if (p->numa_scan_period == 0) {
p->numa_scan_period_max = task_scan_max(p);
p->numa_scan_period = task_scan_start(p);
}
next_scan = now + msecs_to_jiffies(p->numa_scan_period);
if (!try_cmpxchg(&mm->numa_next_scan, &migrate, next_scan))
return;
p->node_stamp += 2 * TICK_NSEC;
start = mm->numa_scan_offset;
pages = sysctl_numa_balancing_scan_size;
pages <<= 20 - PAGE_SHIFT;
virtpages = pages * 8;
if (!pages)
return;
if (!mmap_read_trylock(mm))
return;
vma_iter_init(&vmi, mm, start);
vma = vma_next(&vmi);
if (!vma) {
reset_ptenuma_scan(p);
start = 0;
vma_iter_set(&vmi, start);
vma = vma_next(&vmi);
}
do {
if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
continue;
}
if (!vma->vm_mm ||
(vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ)))
continue;
if (!vma_is_accessible(vma))
continue;
if (!vma->numab_state) {
vma->numab_state = kzalloc(sizeof(struct vma_numab_state),
GFP_KERNEL);
if (!vma->numab_state)
continue;
vma->numab_state->next_scan = now +
msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
vma->numab_state->next_pid_reset = vma->numab_state->next_scan +
msecs_to_jiffies(VMA_PID_RESET_PERIOD);
}
if (mm->numa_scan_seq && time_before(jiffies,
vma->numab_state->next_scan))
continue;
if (!vma_is_accessed(vma))
continue;
if (mm->numa_scan_seq &&
time_after(jiffies, vma->numab_state->next_pid_reset)) {
vma->numab_state->next_pid_reset = vma->numab_state->next_pid_reset +
msecs_to_jiffies(VMA_PID_RESET_PERIOD);
vma->numab_state->access_pids[0] = READ_ONCE(vma->numab_state->access_pids[1]);
vma->numab_state->access_pids[1] = 0;
}
do {
start = max(start, vma->vm_start);
end = ALIGN(start + (pages << PAGE_SHIFT), HPAGE_SIZE);
end = min(end, vma->vm_end);
nr_pte_updates = change_prot_numa(vma, start, end);
if (nr_pte_updates)
pages -= (end - start) >> PAGE_SHIFT;
virtpages -= (end - start) >> PAGE_SHIFT;
start = end;
if (pages <= 0 || virtpages <= 0)
goto out;
cond_resched();
} while (end != vma->vm_end);
} for_each_vma(vmi, vma);
out:
if (vma)
mm->numa_scan_offset = start;
else
reset_ptenuma_scan(p);
mmap_read_unlock(mm);
if (unlikely(p->se.sum_exec_runtime != runtime)) {
u64 diff = p->se.sum_exec_runtime - runtime;
p->node_stamp += 32 * diff;
}
}
void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
{
int mm_users = 0;
struct mm_struct *mm = p->mm;
if (mm) {
mm_users = atomic_read(&mm->mm_users);
if (mm_users == 1) {
mm->numa_next_scan = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
mm->numa_scan_seq = 0;
}
}
p->node_stamp = 0;
p->numa_scan_seq = mm ? mm->numa_scan_seq : 0;
p->numa_scan_period = sysctl_numa_balancing_scan_delay;
p->numa_migrate_retry = 0;
p->numa_work.next = &p->numa_work;
p->numa_faults = NULL;
p->numa_pages_migrated = 0;
p->total_numa_faults = 0;
RCU_INIT_POINTER(p->numa_group, NULL);
p->last_task_numa_placement = 0;
p->last_sum_exec_runtime = 0;
init_task_work(&p->numa_work, task_numa_work);
if (!(clone_flags & CLONE_VM)) {
p->numa_preferred_nid = NUMA_NO_NODE;
return;
}
if (mm) {
unsigned int delay;
delay = min_t(unsigned int, task_scan_max(current),
current->numa_scan_period * mm_users * NSEC_PER_MSEC);
delay += 2 * TICK_NSEC;
p->node_stamp = delay;
}
}
static void task_tick_numa(struct rq *rq, struct task_struct *curr)
{
struct callback_head *work = &curr->numa_work;
u64 period, now;
if (!curr->mm || (curr->flags & (PF_EXITING | PF_KTHREAD)) || work->next != work)
return;
now = curr->se.sum_exec_runtime;
period = (u64)curr->numa_scan_period * NSEC_PER_MSEC;
if (now > curr->node_stamp + period) {
if (!curr->node_stamp)
curr->numa_scan_period = task_scan_start(curr);
curr->node_stamp += period;
if (!time_before(jiffies, curr->mm->numa_next_scan))
task_work_add(curr, work, TWA_RESUME);
}
}
static void update_scan_period(struct task_struct *p, int new_cpu)
{
int src_nid = cpu_to_node(task_cpu(p));
int dst_nid = cpu_to_node(new_cpu);
if (!static_branch_likely(&sched_numa_balancing))
return;
if (!p->mm || !p->numa_faults || (p->flags & PF_EXITING))
return;
if (src_nid == dst_nid)
return;
if (p->numa_scan_seq) {
if (dst_nid == p->numa_preferred_nid ||
(p->numa_preferred_nid != NUMA_NO_NODE &&
src_nid != p->numa_preferred_nid))
return;
}
p->numa_scan_period = task_scan_start(p);
}
#else
static void task_tick_numa(struct rq *rq, struct task_struct *curr)
{
}
static inline void account_numa_enqueue(struct rq *rq, struct task_struct *p)
{
}
static inline void account_numa_dequeue(struct rq *rq, struct task_struct *p)
{
}
static inline void update_scan_period(struct task_struct *p, int new_cpu)
{
}
#endif /* CONFIG_NUMA_BALANCING */
static void
account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
update_load_add(&cfs_rq->load, se->load.weight);
#ifdef CONFIG_SMP
if (entity_is_task(se)) {
struct rq *rq = rq_of(cfs_rq);
account_numa_enqueue(rq, task_of(se));
list_add(&se->group_node, &rq->cfs_tasks);
}
#endif
cfs_rq->nr_running++;
if (se_is_idle(se))
cfs_rq->idle_nr_running++;
}
static void
account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
update_load_sub(&cfs_rq->load, se->load.weight);
#ifdef CONFIG_SMP
if (entity_is_task(se)) {
account_numa_dequeue(rq_of(cfs_rq), task_of(se));
list_del_init(&se->group_node);
}
#endif
cfs_rq->nr_running--;
if (se_is_idle(se))
cfs_rq->idle_nr_running--;
}
#define add_positive(_ptr, _val) do { \
typeof(_ptr) ptr = (_ptr); \
typeof(_val) val = (_val); \
typeof(*ptr) res, var = READ_ONCE(*ptr); \
\
res = var + val; \
\
if (val < 0 && res > var) \
res = 0; \
\
WRITE_ONCE(*ptr, res); \
} while (0)
#define sub_positive(_ptr, _val) do { \
typeof(_ptr) ptr = (_ptr); \
typeof(*ptr) val = (_val); \
typeof(*ptr) res, var = READ_ONCE(*ptr); \
res = var - val; \
if (res > var) \
res = 0; \
WRITE_ONCE(*ptr, res); \
} while (0)
#define lsub_positive(_ptr, _val) do { \
typeof(_ptr) ptr = (_ptr); \
*ptr -= min_t(typeof(*ptr), *ptr, _val); \
} while (0)
#ifdef CONFIG_SMP
static inline void
enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
cfs_rq->avg.load_avg += se->avg.load_avg;
cfs_rq->avg.load_sum += se_weight(se) * se->avg.load_sum;
}
static inline void
dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg);
sub_positive(&cfs_rq->avg.load_sum, se_weight(se) * se->avg.load_sum);
cfs_rq->avg.load_sum = max_t(u32, cfs_rq->avg.load_sum,
cfs_rq->avg.load_avg * PELT_MIN_DIVIDER);
}
#else
static inline void
enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
static inline void
dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
#endif
static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
unsigned long weight)
{
unsigned long old_weight = se->load.weight;
if (se->on_rq) {
if (cfs_rq->curr == se)
update_curr(cfs_rq);
else
avg_vruntime_sub(cfs_rq, se);
update_load_sub(&cfs_rq->load, se->load.weight);
}
dequeue_load_avg(cfs_rq, se);
update_load_set(&se->load, weight);
if (!se->on_rq) {
se->vlag = div_s64(se->vlag * old_weight, weight);
} else {
s64 deadline = se->deadline - se->vruntime;
deadline = div_s64(deadline * old_weight, weight);
se->deadline = se->vruntime + deadline;
if (se != cfs_rq->curr)
min_deadline_cb_propagate(&se->run_node, NULL);
}
#ifdef CONFIG_SMP
do {
u32 divider = get_pelt_divider(&se->avg);
se->avg.load_avg = div_u64(se_weight(se) * se->avg.load_sum, divider);
} while (0);
#endif
enqueue_load_avg(cfs_rq, se);
if (se->on_rq) {
update_load_add(&cfs_rq->load, se->load.weight);
if (cfs_rq->curr != se)
avg_vruntime_add(cfs_rq, se);
}
}
void reweight_task(struct task_struct *p, int prio)
{
struct sched_entity *se = &p->se;
struct cfs_rq *cfs_rq = cfs_rq_of(se);
struct load_weight *load = &se->load;
unsigned long weight = scale_load(sched_prio_to_weight[prio]);
reweight_entity(cfs_rq, se, weight);
load->inv_weight = sched_prio_to_wmult[prio];
}
static inline int throttled_hierarchy(struct cfs_rq *cfs_rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_SMP
static long calc_group_shares(struct cfs_rq *cfs_rq)
{
long tg_weight, tg_shares, load, shares;
struct task_group *tg = cfs_rq->tg;
tg_shares = READ_ONCE(tg->shares);
load = max(scale_load_down(cfs_rq->load.weight), cfs_rq->avg.load_avg);
tg_weight = atomic_long_read(&tg->load_avg);
tg_weight -= cfs_rq->tg_load_avg_contrib;
tg_weight += load;
shares = (tg_shares * load);
if (tg_weight)
shares /= tg_weight;
return clamp_t(long, shares, MIN_SHARES, tg_shares);
}
#endif /* CONFIG_SMP */
static void update_cfs_group(struct sched_entity *se)
{
struct cfs_rq *gcfs_rq = group_cfs_rq(se);
long shares;
if (!gcfs_rq)
return;
if (throttled_hierarchy(gcfs_rq))
return;
#ifndef CONFIG_SMP
shares = READ_ONCE(gcfs_rq->tg->shares);
if (likely(se->load.weight == shares))
return;
#else
shares = calc_group_shares(gcfs_rq);
#endif
reweight_entity(cfs_rq_of(se), se, shares);
}
#else /* CONFIG_FAIR_GROUP_SCHED */
static inline void update_cfs_group(struct sched_entity *se)
{
}
#endif /* CONFIG_FAIR_GROUP_SCHED */
static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq, int flags)
{
struct rq *rq = rq_of(cfs_rq);
if (&rq->cfs == cfs_rq) {
cpufreq_update_util(rq, flags);
}
}
#ifdef CONFIG_SMP
static inline bool load_avg_is_decayed(struct sched_avg *sa)
{
if (sa->load_sum)
return false;
if (sa->util_sum)
return false;
if (sa->runnable_sum)
return false;
SCHED_WARN_ON(sa->load_avg ||
sa->util_avg ||
sa->runnable_avg);
return true;
}
static inline u64 cfs_rq_last_update_time(struct cfs_rq *cfs_rq)
{
return u64_u32_load_copy(cfs_rq->avg.last_update_time,
cfs_rq->last_update_time_copy);
}
#ifdef CONFIG_FAIR_GROUP_SCHED
static inline bool child_cfs_rq_on_list(struct cfs_rq *cfs_rq)
{
struct cfs_rq *prev_cfs_rq;
struct list_head *prev;
if (cfs_rq->on_list) {
prev = cfs_rq->leaf_cfs_rq_list.prev;
} else {
struct rq *rq = rq_of(cfs_rq);
prev = rq->tmp_alone_branch;
}
prev_cfs_rq = container_of(prev, struct cfs_rq, leaf_cfs_rq_list);
return (prev_cfs_rq->tg->parent == cfs_rq->tg);
}
static inline bool cfs_rq_is_decayed(struct cfs_rq *cfs_rq)
{
if (cfs_rq->load.weight)
return false;
if (!load_avg_is_decayed(&cfs_rq->avg))
return false;
if (child_cfs_rq_on_list(cfs_rq))
return false;
return true;
}
static inline void update_tg_load_avg(struct cfs_rq *cfs_rq)
{
long delta = cfs_rq->avg.load_avg - cfs_rq->tg_load_avg_contrib;
if (cfs_rq->tg == &root_task_group)
return;
if (abs(delta) > cfs_rq->tg_load_avg_contrib / 64) {
atomic_long_add(delta, &cfs_rq->tg->load_avg);
cfs_rq->tg_load_avg_contrib = cfs_rq->avg.load_avg;
}
}
void set_task_rq_fair(struct sched_entity *se,
struct cfs_rq *prev, struct cfs_rq *next)
{
u64 p_last_update_time;
u64 n_last_update_time;
if (!sched_feat(ATTACH_AGE_LOAD))
return;
if (!(se->avg.last_update_time && prev))
return;
p_last_update_time = cfs_rq_last_update_time(prev);
n_last_update_time = cfs_rq_last_update_time(next);
__update_load_avg_blocked_se(p_last_update_time, se);
se->avg.last_update_time = n_last_update_time;
}
static inline void
update_tg_cfs_util(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
{
long delta_sum, delta_avg = gcfs_rq->avg.util_avg - se->avg.util_avg;
u32 new_sum, divider;
if (!delta_avg)
return;
divider = get_pelt_divider(&cfs_rq->avg);
se->avg.util_avg = gcfs_rq->avg.util_avg;
new_sum = se->avg.util_avg * divider;
delta_sum = (long)new_sum - (long)se->avg.util_sum;
se->avg.util_sum = new_sum;
add_positive(&cfs_rq->avg.util_avg, delta_avg);
add_positive(&cfs_rq->avg.util_sum, delta_sum);
cfs_rq->avg.util_sum = max_t(u32, cfs_rq->avg.util_sum,
cfs_rq->avg.util_avg * PELT_MIN_DIVIDER);
}
static inline void
update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
{
long delta_sum, delta_avg = gcfs_rq->avg.runnable_avg - se->avg.runnable_avg;
u32 new_sum, divider;
if (!delta_avg)
return;
divider = get_pelt_divider(&cfs_rq->avg);
se->avg.runnable_avg = gcfs_rq->avg.runnable_avg;
new_sum = se->avg.runnable_avg * divider;
delta_sum = (long)new_sum - (long)se->avg.runnable_sum;
se->avg.runnable_sum = new_sum;
add_positive(&cfs_rq->avg.runnable_avg, delta_avg);
add_positive(&cfs_rq->avg.runnable_sum, delta_sum);
cfs_rq->avg.runnable_sum = max_t(u32, cfs_rq->avg.runnable_sum,
cfs_rq->avg.runnable_avg * PELT_MIN_DIVIDER);
}
static inline void
update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
{
long delta_avg, running_sum, runnable_sum = gcfs_rq->prop_runnable_sum;
unsigned long load_avg;
u64 load_sum = 0;
s64 delta_sum;
u32 divider;
if (!runnable_sum)
return;
gcfs_rq->prop_runnable_sum = 0;
divider = get_pelt_divider(&cfs_rq->avg);
if (runnable_sum >= 0) {
runnable_sum += se->avg.load_sum;
runnable_sum = min_t(long, runnable_sum, divider);
} else {
if (scale_load_down(gcfs_rq->load.weight)) {
load_sum = div_u64(gcfs_rq->avg.load_sum,
scale_load_down(gcfs_rq->load.weight));
}
runnable_sum = min(se->avg.load_sum, load_sum);
}
running_sum = se->avg.util_sum >> SCHED_CAPACITY_SHIFT;
runnable_sum = max(runnable_sum, running_sum);
load_sum = se_weight(se) * runnable_sum;
load_avg = div_u64(load_sum, divider);
delta_avg = load_avg - se->avg.load_avg;
if (!delta_avg)
return;
delta_sum = load_sum - (s64)se_weight(se) * se->avg.load_sum;
se->avg.load_sum = runnable_sum;
se->avg.load_avg = load_avg;
add_positive(&cfs_rq->avg.load_avg, delta_avg);
add_positive(&cfs_rq->avg.load_sum, delta_sum);
cfs_rq->avg.load_sum = max_t(u32, cfs_rq->avg.load_sum,
cfs_rq->avg.load_avg * PELT_MIN_DIVIDER);
}
static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum)
{
cfs_rq->propagate = 1;
cfs_rq->prop_runnable_sum += runnable_sum;
}
static inline int propagate_entity_load_avg(struct sched_entity *se)
{
struct cfs_rq *cfs_rq, *gcfs_rq;
if (entity_is_task(se))
return 0;
gcfs_rq = group_cfs_rq(se);
if (!gcfs_rq->propagate)
return 0;
gcfs_rq->propagate = 0;
cfs_rq = cfs_rq_of(se);
add_tg_cfs_propagate(cfs_rq, gcfs_rq->prop_runnable_sum);
update_tg_cfs_util(cfs_rq, se, gcfs_rq);
update_tg_cfs_runnable(cfs_rq, se, gcfs_rq);
update_tg_cfs_load(cfs_rq, se, gcfs_rq);
trace_pelt_cfs_tp(cfs_rq);
trace_pelt_se_tp(se);
return 1;
}
static inline bool skip_blocked_update(struct sched_entity *se)
{
struct cfs_rq *gcfs_rq = group_cfs_rq(se);
if (se->avg.load_avg || se->avg.util_avg)
return false;
if (gcfs_rq->propagate)
return false;
return true;
}
#else /* CONFIG_FAIR_GROUP_SCHED */
static inline void update_tg_load_avg(struct cfs_rq *cfs_rq) {}
static inline int propagate_entity_load_avg(struct sched_entity *se)
{
return 0;
}
static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum) {}
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_NO_HZ_COMMON
static inline void migrate_se_pelt_lag(struct sched_entity *se)
{
u64 throttled = 0, now, lut;
struct cfs_rq *cfs_rq;
struct rq *rq;
bool is_idle;
if (load_avg_is_decayed(&se->avg))
return;
cfs_rq = cfs_rq_of(se);
rq = rq_of(cfs_rq);
rcu_read_lock();
is_idle = is_idle_task(rcu_dereference(rq->curr));
rcu_read_unlock();
if (!is_idle)
return;
#ifdef CONFIG_CFS_BANDWIDTH
throttled = u64_u32_load(cfs_rq->throttled_pelt_idle);
if (throttled == U64_MAX)
return;
#endif
now = u64_u32_load(rq->clock_pelt_idle);
smp_rmb();
lut = cfs_rq_last_update_time(cfs_rq);
now -= throttled;
if (now < lut)
now = lut;
else
now += sched_clock_cpu(cpu_of(rq)) - u64_u32_load(rq->clock_idle);
__update_load_avg_blocked_se(now, se);
}
#else
static void migrate_se_pelt_lag(struct sched_entity *se) {}
#endif
static inline int
update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
{
unsigned long removed_load = 0, removed_util = 0, removed_runnable = 0;
struct sched_avg *sa = &cfs_rq->avg;
int decayed = 0;
if (cfs_rq->removed.nr) {
unsigned long r;
u32 divider = get_pelt_divider(&cfs_rq->avg);
raw_spin_lock(&cfs_rq->removed.lock);
swap(cfs_rq->removed.util_avg, removed_util);
swap(cfs_rq->removed.load_avg, removed_load);
swap(cfs_rq->removed.runnable_avg, removed_runnable);
cfs_rq->removed.nr = 0;
raw_spin_unlock(&cfs_rq->removed.lock);
r = removed_load;
sub_positive(&sa->load_avg, r);
sub_positive(&sa->load_sum, r * divider);
sa->load_sum = max_t(u32, sa->load_sum, sa->load_avg * PELT_MIN_DIVIDER);
r = removed_util;
sub_positive(&sa->util_avg, r);
sub_positive(&sa->util_sum, r * divider);
sa->util_sum = max_t(u32, sa->util_sum, sa->util_avg * PELT_MIN_DIVIDER);
r = removed_runnable;
sub_positive(&sa->runnable_avg, r);
sub_positive(&sa->runnable_sum, r * divider);
sa->runnable_sum = max_t(u32, sa->runnable_sum,
sa->runnable_avg * PELT_MIN_DIVIDER);
add_tg_cfs_propagate(cfs_rq,
-(long)(removed_runnable * divider) >> SCHED_CAPACITY_SHIFT);
decayed = 1;
}
decayed |= __update_load_avg_cfs_rq(now, cfs_rq);
u64_u32_store_copy(sa->last_update_time,
cfs_rq->last_update_time_copy,
sa->last_update_time);
return decayed;
}
static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
u32 divider = get_pelt_divider(&cfs_rq->avg);
se->avg.last_update_time = cfs_rq->avg.last_update_time;
se->avg.period_contrib = cfs_rq->avg.period_contrib;
se->avg.util_sum = se->avg.util_avg * divider;
se->avg.runnable_sum = se->avg.runnable_avg * divider;
se->avg.load_sum = se->avg.load_avg * divider;
if (se_weight(se) < se->avg.load_sum)
se->avg.load_sum = div_u64(se->avg.load_sum, se_weight(se));
else
se->avg.load_sum = 1;
enqueue_load_avg(cfs_rq, se);
cfs_rq->avg.util_avg += se->avg.util_avg;
cfs_rq->avg.util_sum += se->avg.util_sum;
cfs_rq->avg.runnable_avg += se->avg.runnable_avg;
cfs_rq->avg.runnable_sum += se->avg.runnable_sum;
add_tg_cfs_propagate(cfs_rq, se->avg.load_sum);
cfs_rq_util_change(cfs_rq, 0);
trace_pelt_cfs_tp(cfs_rq);
}
static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
dequeue_load_avg(cfs_rq, se);
sub_positive(&cfs_rq->avg.util_avg, se->avg.util_avg);
sub_positive(&cfs_rq->avg.util_sum, se->avg.util_sum);
cfs_rq->avg.util_sum = max_t(u32, cfs_rq->avg.util_sum,
cfs_rq->avg.util_avg * PELT_MIN_DIVIDER);
sub_positive(&cfs_rq->avg.runnable_avg, se->avg.runnable_avg);
sub_positive(&cfs_rq->avg.runnable_sum, se->avg.runnable_sum);
cfs_rq->avg.runnable_sum = max_t(u32, cfs_rq->avg.runnable_sum,
cfs_rq->avg.runnable_avg * PELT_MIN_DIVIDER);
add_tg_cfs_propagate(cfs_rq, -se->avg.load_sum);
cfs_rq_util_change(cfs_rq, 0);
trace_pelt_cfs_tp(cfs_rq);
}
#define UPDATE_TG 0x1
#define SKIP_AGE_LOAD 0x2
#define DO_ATTACH 0x4
#define DO_DETACH 0x8
static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
u64 now = cfs_rq_clock_pelt(cfs_rq);
int decayed;
if (se->avg.last_update_time && !(flags & SKIP_AGE_LOAD))
__update_load_avg_se(now, cfs_rq, se);
decayed = update_cfs_rq_load_avg(now, cfs_rq);
decayed |= propagate_entity_load_avg(se);
if (!se->avg.last_update_time && (flags & DO_ATTACH)) {
attach_entity_load_avg(cfs_rq, se);
update_tg_load_avg(cfs_rq);
} else if (flags & DO_DETACH) {
detach_entity_load_avg(cfs_rq, se);
update_tg_load_avg(cfs_rq);
} else if (decayed) {
cfs_rq_util_change(cfs_rq, 0);
if (flags & UPDATE_TG)
update_tg_load_avg(cfs_rq);
}
}
static void sync_entity_load_avg(struct sched_entity *se)
{
struct cfs_rq *cfs_rq = cfs_rq_of(se);
u64 last_update_time;
last_update_time = cfs_rq_last_update_time(cfs_rq);
__update_load_avg_blocked_se(last_update_time, se);
}
static void remove_entity_load_avg(struct sched_entity *se)
{
struct cfs_rq *cfs_rq = cfs_rq_of(se);
unsigned long flags;
sync_entity_load_avg(se);
raw_spin_lock_irqsave(&cfs_rq->removed.lock, flags);
++cfs_rq->removed.nr;
cfs_rq->removed.util_avg += se->avg.util_avg;
cfs_rq->removed.load_avg += se->avg.load_avg;
cfs_rq->removed.runnable_avg += se->avg.runnable_avg;
raw_spin_unlock_irqrestore(&cfs_rq->removed.lock, flags);
}
static inline unsigned long cfs_rq_runnable_avg(struct cfs_rq *cfs_rq)
{
return cfs_rq->avg.runnable_avg;
}
static inline unsigned long cfs_rq_load_avg(struct cfs_rq *cfs_rq)
{
return cfs_rq->avg.load_avg;
}
static int newidle_balance(struct rq *this_rq, struct rq_flags *rf);
static inline unsigned long task_util(struct task_struct *p)
{
return READ_ONCE(p->se.avg.util_avg);
}
static inline unsigned long _task_util_est(struct task_struct *p)
{
struct util_est ue = READ_ONCE(p->se.avg.util_est);
return max(ue.ewma, (ue.enqueued & ~UTIL_AVG_UNCHANGED));
}
static inline unsigned long task_util_est(struct task_struct *p)
{
return max(task_util(p), _task_util_est(p));
}
#ifdef CONFIG_UCLAMP_TASK
static inline unsigned long uclamp_task_util(struct task_struct *p,
unsigned long uclamp_min,
unsigned long uclamp_max)
{
return clamp(task_util_est(p), uclamp_min, uclamp_max);
}
#else
static inline unsigned long uclamp_task_util(struct task_struct *p,
unsigned long uclamp_min,
unsigned long uclamp_max)
{
return task_util_est(p);
}
#endif
static inline void util_est_enqueue(struct cfs_rq *cfs_rq,
struct task_struct *p)
{
unsigned int enqueued;
if (!sched_feat(UTIL_EST))
return;
enqueued = cfs_rq->avg.util_est.enqueued;
enqueued += _task_util_est(p);
WRITE_ONCE(cfs_rq->avg.util_est.enqueued, enqueued);
trace_sched_util_est_cfs_tp(cfs_rq);
}
static inline void util_est_dequeue(struct cfs_rq *cfs_rq,
struct task_struct *p)
{
unsigned int enqueued;
if (!sched_feat(UTIL_EST))
return;
enqueued = cfs_rq->avg.util_est.enqueued;
enqueued -= min_t(unsigned int, enqueued, _task_util_est(p));
WRITE_ONCE(cfs_rq->avg.util_est.enqueued, enqueued);
trace_sched_util_est_cfs_tp(cfs_rq);
}
#define UTIL_EST_MARGIN (SCHED_CAPACITY_SCALE / 100)
static inline bool within_margin(int value, int margin)
{
return ((unsigned int)(value + margin - 1) < (2 * margin - 1));
}
static inline void util_est_update(struct cfs_rq *cfs_rq,
struct task_struct *p,
bool task_sleep)
{
long last_ewma_diff, last_enqueued_diff;
struct util_est ue;
if (!sched_feat(UTIL_EST))
return;
if (!task_sleep)
return;
ue = p->se.avg.util_est;
if (ue.enqueued & UTIL_AVG_UNCHANGED)
return;
last_enqueued_diff = ue.enqueued;
ue.enqueued = task_util(p);
if (sched_feat(UTIL_EST_FASTUP)) {
if (ue.ewma < ue.enqueued) {
ue.ewma = ue.enqueued;
goto done;
}
}
last_ewma_diff = ue.enqueued - ue.ewma;
last_enqueued_diff -= ue.enqueued;
if (within_margin(last_ewma_diff, UTIL_EST_MARGIN)) {
if (!within_margin(last_enqueued_diff, UTIL_EST_MARGIN))
goto done;
return;
}
if (task_util(p) > capacity_orig_of(cpu_of(rq_of(cfs_rq))))
return;
ue.ewma <<= UTIL_EST_WEIGHT_SHIFT;
ue.ewma += last_ewma_diff;
ue.ewma >>= UTIL_EST_WEIGHT_SHIFT;
done:
ue.enqueued |= UTIL_AVG_UNCHANGED;
WRITE_ONCE(p->se.avg.util_est, ue);
trace_sched_util_est_se_tp(&p->se);
}
static inline int util_fits_cpu(unsigned long util,
unsigned long uclamp_min,
unsigned long uclamp_max,
int cpu)
{
unsigned long capacity_orig, capacity_orig_thermal;
unsigned long capacity = capacity_of(cpu);
bool fits, uclamp_max_fits;
fits = fits_capacity(util, capacity);
if (!uclamp_is_used())
return fits;
capacity_orig = capacity_orig_of(cpu);
capacity_orig_thermal = capacity_orig - arch_scale_thermal_pressure(cpu);
uclamp_max_fits = (capacity_orig == SCHED_CAPACITY_SCALE) && (uclamp_max == SCHED_CAPACITY_SCALE);
uclamp_max_fits = !uclamp_max_fits && (uclamp_max <= capacity_orig);
fits = fits || uclamp_max_fits;
uclamp_min = min(uclamp_min, uclamp_max);
if (fits && (util < uclamp_min) && (uclamp_min > capacity_orig_thermal))
return -1;
return fits;
}
static inline int task_fits_cpu(struct task_struct *p, int cpu)
{
unsigned long uclamp_min = uclamp_eff_value(p, UCLAMP_MIN);
unsigned long uclamp_max = uclamp_eff_value(p, UCLAMP_MAX);
unsigned long util = task_util_est(p);
return (util_fits_cpu(util, uclamp_min, uclamp_max, cpu) > 0);
}
static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
{
if (!sched_asym_cpucap_active())
return;
if (!p || p->nr_cpus_allowed == 1) {
rq->misfit_task_load = 0;
return;
}
if (task_fits_cpu(p, cpu_of(rq))) {
rq->misfit_task_load = 0;
return;
}
rq->misfit_task_load = max_t(unsigned long, task_h_load(p), 1);
}
#else /* CONFIG_SMP */
static inline bool cfs_rq_is_decayed(struct cfs_rq *cfs_rq)
{
return true;
}
#define UPDATE_TG 0x0
#define SKIP_AGE_LOAD 0x0
#define DO_ATTACH 0x0
#define DO_DETACH 0x0
static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int not_used1)
{
cfs_rq_util_change(cfs_rq, 0);
}
static inline void remove_entity_load_avg(struct sched_entity *se) {}
static inline void
attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
static inline void
detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
static inline int newidle_balance(struct rq *rq, struct rq_flags *rf)
{
return 0;
}
static inline void
util_est_enqueue(struct cfs_rq *cfs_rq, struct task_struct *p) {}
static inline void
util_est_dequeue(struct cfs_rq *cfs_rq, struct task_struct *p) {}
static inline void
util_est_update(struct cfs_rq *cfs_rq, struct task_struct *p,
bool task_sleep) {}
static inline void update_misfit_status(struct task_struct *p, struct rq *rq) {}
#endif /* CONFIG_SMP */
static void
place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
u64 vslice, vruntime = avg_vruntime(cfs_rq);
s64 lag = 0;
se->slice = sysctl_sched_base_slice;
vslice = calc_delta_fair(se->slice, se);
if (sched_feat(PLACE_LAG) && cfs_rq->nr_running) {
struct sched_entity *curr = cfs_rq->curr;
unsigned long load;
lag = se->vlag;
load = cfs_rq->avg_load;
if (curr && curr->on_rq)
load += scale_load_down(curr->load.weight);
lag *= load + scale_load_down(se->load.weight);
if (WARN_ON_ONCE(!load))
load = 1;
lag = div_s64(lag, load);
}
se->vruntime = vruntime - lag;
if (sched_feat(PLACE_DEADLINE_INITIAL) && (flags & ENQUEUE_INITIAL))
vslice /= 2;
se->deadline = se->vruntime + vslice;
}
static void check_enqueue_throttle(struct cfs_rq *cfs_rq);
static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq);
static inline bool cfs_bandwidth_used(void);
static void
enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
bool curr = cfs_rq->curr == se;
if (curr)
place_entity(cfs_rq, se, flags);
update_curr(cfs_rq);
update_load_avg(cfs_rq, se, UPDATE_TG | DO_ATTACH);
se_update_runnable(se);
update_cfs_group(se);
if (!curr)
place_entity(cfs_rq, se, flags);
account_entity_enqueue(cfs_rq, se);
if (flags & ENQUEUE_MIGRATED)
se->exec_start = 0;
check_schedstat_required();
update_stats_enqueue_fair(cfs_rq, se, flags);
if (!curr)
__enqueue_entity(cfs_rq, se);
se->on_rq = 1;
if (cfs_rq->nr_running == 1) {
check_enqueue_throttle(cfs_rq);
if (!throttled_hierarchy(cfs_rq)) {
list_add_leaf_cfs_rq(cfs_rq);
} else {
#ifdef CONFIG_CFS_BANDWIDTH
struct rq *rq = rq_of(cfs_rq);
if (cfs_rq_throttled(cfs_rq) && !cfs_rq->throttled_clock)
cfs_rq->throttled_clock = rq_clock(rq);
if (!cfs_rq->throttled_clock_self)
cfs_rq->throttled_clock_self = rq_clock(rq);
#endif
}
}
}
static void __clear_buddies_next(struct sched_entity *se)
{
for_each_sched_entity(se) {
struct cfs_rq *cfs_rq = cfs_rq_of(se);
if (cfs_rq->next != se)
break;
cfs_rq->next = NULL;
}
}
static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
if (cfs_rq->next == se)
__clear_buddies_next(se);
}
static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq);
static void
dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
{
int action = UPDATE_TG;
if (entity_is_task(se) && task_on_rq_migrating(task_of(se)))
action |= DO_DETACH;
update_curr(cfs_rq);
update_load_avg(cfs_rq, se, action);
se_update_runnable(se);
update_stats_dequeue_fair(cfs_rq, se, flags);
clear_buddies(cfs_rq, se);
update_entity_lag(cfs_rq, se);
if (se != cfs_rq->curr)
__dequeue_entity(cfs_rq, se);
se->on_rq = 0;
account_entity_dequeue(cfs_rq, se);
return_cfs_rq_runtime(cfs_rq);
update_cfs_group(se);
if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) != DEQUEUE_SAVE)
update_min_vruntime(cfs_rq);
if (cfs_rq->nr_running == 0)
update_idle_cfs_rq_clock_pelt(cfs_rq);
}
static void
set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
clear_buddies(cfs_rq, se);
if (se->on_rq) {
update_stats_wait_end_fair(cfs_rq, se);
__dequeue_entity(cfs_rq, se);
update_load_avg(cfs_rq, se, UPDATE_TG);
se->vlag = se->deadline;
}
update_stats_curr_start(cfs_rq, se);
cfs_rq->curr = se;
if (schedstat_enabled() &&
rq_of(cfs_rq)->cfs.load.weight >= 2*se->load.weight) {
struct sched_statistics *stats;
stats = __schedstats_from_se(se);
__schedstat_set(stats->slice_max,
max((u64)stats->slice_max,
se->sum_exec_runtime - se->prev_sum_exec_runtime));
}
se->prev_sum_exec_runtime = se->sum_exec_runtime;
}
static struct sched_entity *
pick_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *curr)
{
if (sched_feat(NEXT_BUDDY) &&
cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next))
return cfs_rq->next;
return pick_eevdf(cfs_rq);
}
static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq);
static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev)
{
if (prev->on_rq)
update_curr(cfs_rq);
check_cfs_rq_runtime(cfs_rq);
if (prev->on_rq) {
update_stats_wait_start_fair(cfs_rq, prev);
__enqueue_entity(cfs_rq, prev);
update_load_avg(cfs_rq, prev, 0);
}
cfs_rq->curr = NULL;
}
static void
entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
{
update_curr(cfs_rq);
update_load_avg(cfs_rq, curr, UPDATE_TG);
update_cfs_group(curr);
#ifdef CONFIG_SCHED_HRTICK
if (queued) {
resched_curr(rq_of(cfs_rq));
return;
}
if (!sched_feat(DOUBLE_TICK) &&
hrtimer_active(&rq_of(cfs_rq)->hrtick_timer))
return;
#endif
}
#ifdef CONFIG_CFS_BANDWIDTH
#ifdef CONFIG_JUMP_LABEL
static struct static_key __cfs_bandwidth_used;
static inline bool cfs_bandwidth_used(void)
{
return static_key_false(&__cfs_bandwidth_used);
}
void cfs_bandwidth_usage_inc(void)
{
static_key_slow_inc_cpuslocked(&__cfs_bandwidth_used);
}
void cfs_bandwidth_usage_dec(void)
{
static_key_slow_dec_cpuslocked(&__cfs_bandwidth_used);
}
#else /* CONFIG_JUMP_LABEL */
static bool cfs_bandwidth_used(void)
{
return true;
}
void cfs_bandwidth_usage_inc(void) {}
void cfs_bandwidth_usage_dec(void) {}
#endif /* CONFIG_JUMP_LABEL */
static inline u64 default_cfs_period(void)
{
return 100000000ULL;
}
static inline u64 sched_cfs_bandwidth_slice(void)
{
return (u64)sysctl_sched_cfs_bandwidth_slice * NSEC_PER_USEC;
}
void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b)
{
s64 runtime;
if (unlikely(cfs_b->quota == RUNTIME_INF))
return;
cfs_b->runtime += cfs_b->quota;
runtime = cfs_b->runtime_snap - cfs_b->runtime;
if (runtime > 0) {
cfs_b->burst_time += runtime;
cfs_b->nr_burst++;
}
cfs_b->runtime = min(cfs_b->runtime, cfs_b->quota + cfs_b->burst);
cfs_b->runtime_snap = cfs_b->runtime;
}
static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
{
return &tg->cfs_bandwidth;
}
static int __assign_cfs_rq_runtime(struct cfs_bandwidth *cfs_b,
struct cfs_rq *cfs_rq, u64 target_runtime)
{
u64 min_amount, amount = 0;
lockdep_assert_held(&cfs_b->lock);
min_amount = target_runtime - cfs_rq->runtime_remaining;
if (cfs_b->quota == RUNTIME_INF)
amount = min_amount;
else {
start_cfs_bandwidth(cfs_b);
if (cfs_b->runtime > 0) {
amount = min(cfs_b->runtime, min_amount);
cfs_b->runtime -= amount;
cfs_b->idle = 0;
}
}
cfs_rq->runtime_remaining += amount;
return cfs_rq->runtime_remaining > 0;
}
static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
int ret;
raw_spin_lock(&cfs_b->lock);
ret = __assign_cfs_rq_runtime(cfs_b, cfs_rq, sched_cfs_bandwidth_slice());
raw_spin_unlock(&cfs_b->lock);
return ret;
}
static void __account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec)
{
cfs_rq->runtime_remaining -= delta_exec;
if (likely(cfs_rq->runtime_remaining > 0))
return;
if (cfs_rq->throttled)
return;
if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr))
resched_curr(rq_of(cfs_rq));
}
static __always_inline
void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec)
{
if (!cfs_bandwidth_used() || !cfs_rq->runtime_enabled)
return;
__account_cfs_rq_runtime(cfs_rq, delta_exec);
}
static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
{
return cfs_bandwidth_used() && cfs_rq->throttled;
}
static inline int throttled_hierarchy(struct cfs_rq *cfs_rq)
{
return cfs_bandwidth_used() && cfs_rq->throttle_count;
}
static inline int throttled_lb_pair(struct task_group *tg,
int src_cpu, int dest_cpu)
{
struct cfs_rq *src_cfs_rq, *dest_cfs_rq;
src_cfs_rq = tg->cfs_rq[src_cpu];
dest_cfs_rq = tg->cfs_rq[dest_cpu];
return throttled_hierarchy(src_cfs_rq) ||
throttled_hierarchy(dest_cfs_rq);
}
static int tg_unthrottle_up(struct task_group *tg, void *data)
{
struct rq *rq = data;
struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];
cfs_rq->throttle_count--;
if (!cfs_rq->throttle_count) {
cfs_rq->throttled_clock_pelt_time += rq_clock_pelt(rq) -
cfs_rq->throttled_clock_pelt;
if (!cfs_rq_is_decayed(cfs_rq))
list_add_leaf_cfs_rq(cfs_rq);
if (cfs_rq->throttled_clock_self) {
u64 delta = rq_clock(rq) - cfs_rq->throttled_clock_self;
cfs_rq->throttled_clock_self = 0;
if (SCHED_WARN_ON((s64)delta < 0))
delta = 0;
cfs_rq->throttled_clock_self_time += delta;
}
}
return 0;
}
static int tg_throttle_down(struct task_group *tg, void *data)
{
struct rq *rq = data;
struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];
if (!cfs_rq->throttle_count) {
cfs_rq->throttled_clock_pelt = rq_clock_pelt(rq);
list_del_leaf_cfs_rq(cfs_rq);
SCHED_WARN_ON(cfs_rq->throttled_clock_self);
if (cfs_rq->nr_running)
cfs_rq->throttled_clock_self = rq_clock(rq);
}
cfs_rq->throttle_count++;
return 0;
}
static bool throttle_cfs_rq(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
struct sched_entity *se;
long task_delta, idle_task_delta, dequeue = 1;
raw_spin_lock(&cfs_b->lock);
if (__assign_cfs_rq_runtime(cfs_b, cfs_rq, 1)) {
dequeue = 0;
} else {
list_add_tail_rcu(&cfs_rq->throttled_list,
&cfs_b->throttled_cfs_rq);
}
raw_spin_unlock(&cfs_b->lock);
if (!dequeue)
return false;
se = cfs_rq->tg->se[cpu_of(rq_of(cfs_rq))];
rcu_read_lock();
walk_tg_tree_from(cfs_rq->tg, tg_throttle_down, tg_nop, (void *)rq);
rcu_read_unlock();
task_delta = cfs_rq->h_nr_running;
idle_task_delta = cfs_rq->idle_h_nr_running;
for_each_sched_entity(se) {
struct cfs_rq *qcfs_rq = cfs_rq_of(se);
if (!se->on_rq)
goto done;
dequeue_entity(qcfs_rq, se, DEQUEUE_SLEEP);
if (cfs_rq_is_idle(group_cfs_rq(se)))
idle_task_delta = cfs_rq->h_nr_running;
qcfs_rq->h_nr_running -= task_delta;
qcfs_rq->idle_h_nr_running -= idle_task_delta;
if (qcfs_rq->load.weight) {
se = parent_entity(se);
break;
}
}
for_each_sched_entity(se) {
struct cfs_rq *qcfs_rq = cfs_rq_of(se);
if (!se->on_rq)
goto done;
update_load_avg(qcfs_rq, se, 0);
se_update_runnable(se);
if (cfs_rq_is_idle(group_cfs_rq(se)))
idle_task_delta = cfs_rq->h_nr_running;
qcfs_rq->h_nr_running -= task_delta;
qcfs_rq->idle_h_nr_running -= idle_task_delta;
}
sub_nr_running(rq, task_delta);
done:
cfs_rq->throttled = 1;
SCHED_WARN_ON(cfs_rq->throttled_clock);
if (cfs_rq->nr_running)
cfs_rq->throttled_clock = rq_clock(rq);
return true;
}
void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
struct sched_entity *se;
long task_delta, idle_task_delta;
se = cfs_rq->tg->se[cpu_of(rq)];
cfs_rq->throttled = 0;
update_rq_clock(rq);
raw_spin_lock(&cfs_b->lock);
if (cfs_rq->throttled_clock) {
cfs_b->throttled_time += rq_clock(rq) - cfs_rq->throttled_clock;
cfs_rq->throttled_clock = 0;
}
list_del_rcu(&cfs_rq->throttled_list);
raw_spin_unlock(&cfs_b->lock);
walk_tg_tree_from(cfs_rq->tg, tg_nop, tg_unthrottle_up, (void *)rq);
if (!cfs_rq->load.weight) {
if (!cfs_rq->on_list)
return;
for_each_sched_entity(se) {
if (list_add_leaf_cfs_rq(cfs_rq_of(se)))
break;
}
goto unthrottle_throttle;
}
task_delta = cfs_rq->h_nr_running;
idle_task_delta = cfs_rq->idle_h_nr_running;
for_each_sched_entity(se) {
struct cfs_rq *qcfs_rq = cfs_rq_of(se);
if (se->on_rq)
break;
enqueue_entity(qcfs_rq, se, ENQUEUE_WAKEUP);
if (cfs_rq_is_idle(group_cfs_rq(se)))
idle_task_delta = cfs_rq->h_nr_running;
qcfs_rq->h_nr_running += task_delta;
qcfs_rq->idle_h_nr_running += idle_task_delta;
if (cfs_rq_throttled(qcfs_rq))
goto unthrottle_throttle;
}
for_each_sched_entity(se) {
struct cfs_rq *qcfs_rq = cfs_rq_of(se);
update_load_avg(qcfs_rq, se, UPDATE_TG);
se_update_runnable(se);
if (cfs_rq_is_idle(group_cfs_rq(se)))
idle_task_delta = cfs_rq->h_nr_running;
qcfs_rq->h_nr_running += task_delta;
qcfs_rq->idle_h_nr_running += idle_task_delta;
if (cfs_rq_throttled(qcfs_rq))
goto unthrottle_throttle;
}
add_nr_running(rq, task_delta);
unthrottle_throttle:
assert_list_leaf_cfs_rq(rq);
if (rq->curr == rq->idle && rq->cfs.nr_running)
resched_curr(rq);
}
#ifdef CONFIG_SMP
static void __cfsb_csd_unthrottle(void *arg)
{
struct cfs_rq *cursor, *tmp;
struct rq *rq = arg;
struct rq_flags rf;
rq_lock(rq, &rf);
update_rq_clock(rq);
rq_clock_start_loop_update(rq);
rcu_read_lock();
list_for_each_entry_safe(cursor, tmp, &rq->cfsb_csd_list,
throttled_csd_list) {
list_del_init(&cursor->throttled_csd_list);
if (cfs_rq_throttled(cursor))
unthrottle_cfs_rq(cursor);
}
rcu_read_unlock();
rq_clock_stop_loop_update(rq);
rq_unlock(rq, &rf);
}
static inline void __unthrottle_cfs_rq_async(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
bool first;
if (rq == this_rq()) {
unthrottle_cfs_rq(cfs_rq);
return;
}
if (SCHED_WARN_ON(!list_empty(&cfs_rq->throttled_csd_list)))
return;
first = list_empty(&rq->cfsb_csd_list);
list_add_tail(&cfs_rq->throttled_csd_list, &rq->cfsb_csd_list);
if (first)
smp_call_function_single_async(cpu_of(rq), &rq->cfsb_csd);
}
#else
static inline void __unthrottle_cfs_rq_async(struct cfs_rq *cfs_rq)
{
unthrottle_cfs_rq(cfs_rq);
}
#endif
static void unthrottle_cfs_rq_async(struct cfs_rq *cfs_rq)
{
lockdep_assert_rq_held(rq_of(cfs_rq));
if (SCHED_WARN_ON(!cfs_rq_throttled(cfs_rq) ||
cfs_rq->runtime_remaining <= 0))
return;
__unthrottle_cfs_rq_async(cfs_rq);
}
static bool distribute_cfs_runtime(struct cfs_bandwidth *cfs_b)
{
struct cfs_rq *local_unthrottle = NULL;
int this_cpu = smp_processor_id();
u64 runtime, remaining = 1;
bool throttled = false;
struct cfs_rq *cfs_rq;
struct rq_flags rf;
struct rq *rq;
rcu_read_lock();
list_for_each_entry_rcu(cfs_rq, &cfs_b->throttled_cfs_rq,
throttled_list) {
rq = rq_of(cfs_rq);
if (!remaining) {
throttled = true;
break;
}
rq_lock_irqsave(rq, &rf);
if (!cfs_rq_throttled(cfs_rq))
goto next;
#ifdef CONFIG_SMP
if (!list_empty(&cfs_rq->throttled_csd_list))
goto next;
#endif
SCHED_WARN_ON(cfs_rq->runtime_remaining > 0);
raw_spin_lock(&cfs_b->lock);
runtime = -cfs_rq->runtime_remaining + 1;
if (runtime > cfs_b->runtime)
runtime = cfs_b->runtime;
cfs_b->runtime -= runtime;
remaining = cfs_b->runtime;
raw_spin_unlock(&cfs_b->lock);
cfs_rq->runtime_remaining += runtime;
if (cfs_rq->runtime_remaining > 0) {
if (cpu_of(rq) != this_cpu ||
SCHED_WARN_ON(local_unthrottle))
unthrottle_cfs_rq_async(cfs_rq);
else
local_unthrottle = cfs_rq;
} else {
throttled = true;
}
next:
rq_unlock_irqrestore(rq, &rf);
}
rcu_read_unlock();
if (local_unthrottle) {
rq = cpu_rq(this_cpu);
rq_lock_irqsave(rq, &rf);
if (cfs_rq_throttled(local_unthrottle))
unthrottle_cfs_rq(local_unthrottle);
rq_unlock_irqrestore(rq, &rf);
}
return throttled;
}
static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun, unsigned long flags)
{
int throttled;
if (cfs_b->quota == RUNTIME_INF)
goto out_deactivate;
throttled = !list_empty(&cfs_b->throttled_cfs_rq);
cfs_b->nr_periods += overrun;
__refill_cfs_bandwidth_runtime(cfs_b);
if (cfs_b->idle && !throttled)
goto out_deactivate;
if (!throttled) {
cfs_b->idle = 1;
return 0;
}
cfs_b->nr_throttled += overrun;
while (throttled && cfs_b->runtime > 0) {
raw_spin_unlock_irqrestore(&cfs_b->lock, flags);
throttled = distribute_cfs_runtime(cfs_b);
raw_spin_lock_irqsave(&cfs_b->lock, flags);
}
cfs_b->idle = 0;
return 0;
out_deactivate:
return 1;
}
static const u64 min_cfs_rq_runtime = 1 * NSEC_PER_MSEC;
static const u64 min_bandwidth_expiration = 2 * NSEC_PER_MSEC;
static const u64 cfs_bandwidth_slack_period = 5 * NSEC_PER_MSEC;
static int runtime_refresh_within(struct cfs_bandwidth *cfs_b, u64 min_expire)
{
struct hrtimer *refresh_timer = &cfs_b->period_timer;
s64 remaining;
if (hrtimer_callback_running(refresh_timer))
return 1;
remaining = ktime_to_ns(hrtimer_expires_remaining(refresh_timer));
if (remaining < (s64)min_expire)
return 1;
return 0;
}
static void start_cfs_slack_bandwidth(struct cfs_bandwidth *cfs_b)
{
u64 min_left = cfs_bandwidth_slack_period + min_bandwidth_expiration;
if (runtime_refresh_within(cfs_b, min_left))
return;
if (cfs_b->slack_started)
return;
cfs_b->slack_started = true;
hrtimer_start(&cfs_b->slack_timer,
ns_to_ktime(cfs_bandwidth_slack_period),
HRTIMER_MODE_REL);
}
static void __return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
s64 slack_runtime = cfs_rq->runtime_remaining - min_cfs_rq_runtime;
if (slack_runtime <= 0)
return;
raw_spin_lock(&cfs_b->lock);
if (cfs_b->quota != RUNTIME_INF) {
cfs_b->runtime += slack_runtime;
if (cfs_b->runtime > sched_cfs_bandwidth_slice() &&
!list_empty(&cfs_b->throttled_cfs_rq))
start_cfs_slack_bandwidth(cfs_b);
}
raw_spin_unlock(&cfs_b->lock);
cfs_rq->runtime_remaining -= slack_runtime;
}
static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
if (!cfs_bandwidth_used())
return;
if (!cfs_rq->runtime_enabled || cfs_rq->nr_running)
return;
__return_cfs_rq_runtime(cfs_rq);
}
static void do_sched_cfs_slack_timer(struct cfs_bandwidth *cfs_b)
{
u64 runtime = 0, slice = sched_cfs_bandwidth_slice();
unsigned long flags;
raw_spin_lock_irqsave(&cfs_b->lock, flags);
cfs_b->slack_started = false;
if (runtime_refresh_within(cfs_b, min_bandwidth_expiration)) {
raw_spin_unlock_irqrestore(&cfs_b->lock, flags);
return;
}
if (cfs_b->quota != RUNTIME_INF && cfs_b->runtime > slice)
runtime = cfs_b->runtime;
raw_spin_unlock_irqrestore(&cfs_b->lock, flags);
if (!runtime)
return;
distribute_cfs_runtime(cfs_b);
}
static void check_enqueue_throttle(struct cfs_rq *cfs_rq)
{
if (!cfs_bandwidth_used())
return;
if (!cfs_rq->runtime_enabled || cfs_rq->curr)
return;
if (cfs_rq_throttled(cfs_rq))
return;
account_cfs_rq_runtime(cfs_rq, 0);
if (cfs_rq->runtime_remaining <= 0)
throttle_cfs_rq(cfs_rq);
}
static void sync_throttle(struct task_group *tg, int cpu)
{
struct cfs_rq *pcfs_rq, *cfs_rq;
if (!cfs_bandwidth_used())
return;
if (!tg->parent)
return;
cfs_rq = tg->cfs_rq[cpu];
pcfs_rq = tg->parent->cfs_rq[cpu];
cfs_rq->throttle_count = pcfs_rq->throttle_count;
cfs_rq->throttled_clock_pelt = rq_clock_pelt(cpu_rq(cpu));
}
static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
if (!cfs_bandwidth_used())
return false;
if (likely(!cfs_rq->runtime_enabled || cfs_rq->runtime_remaining > 0))
return false;
if (cfs_rq_throttled(cfs_rq))
return true;
return throttle_cfs_rq(cfs_rq);
}
static enum hrtimer_restart sched_cfs_slack_timer(struct hrtimer *timer)
{
struct cfs_bandwidth *cfs_b =
container_of(timer, struct cfs_bandwidth, slack_timer);
do_sched_cfs_slack_timer(cfs_b);
return HRTIMER_NORESTART;
}
extern const u64 max_cfs_quota_period;
static enum hrtimer_restart sched_cfs_period_timer(struct hrtimer *timer)
{
struct cfs_bandwidth *cfs_b =
container_of(timer, struct cfs_bandwidth, period_timer);
unsigned long flags;
int overrun;
int idle = 0;
int count = 0;
raw_spin_lock_irqsave(&cfs_b->lock, flags);
for (;;) {
overrun = hrtimer_forward_now(timer, cfs_b->period);
if (!overrun)
break;
idle = do_sched_cfs_period_timer(cfs_b, overrun, flags);
if (++count > 3) {
u64 new, old = ktime_to_ns(cfs_b->period);
new = old * 2;
if (new < max_cfs_quota_period) {
cfs_b->period = ns_to_ktime(new);
cfs_b->quota *= 2;
cfs_b->burst *= 2;
pr_warn_ratelimited(
"cfs_period_timer[cpu%d]: period too short, scaling up (new cfs_period_us = %lld, cfs_quota_us = %lld)\n",
smp_processor_id(),
div_u64(new, NSEC_PER_USEC),
div_u64(cfs_b->quota, NSEC_PER_USEC));
} else {
pr_warn_ratelimited(
"cfs_period_timer[cpu%d]: period too short, but cannot scale up without losing precision (cfs_period_us = %lld, cfs_quota_us = %lld)\n",
smp_processor_id(),
div_u64(old, NSEC_PER_USEC),
div_u64(cfs_b->quota, NSEC_PER_USEC));
}
count = 0;
}
}
if (idle)
cfs_b->period_active = 0;
raw_spin_unlock_irqrestore(&cfs_b->lock, flags);
return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
}
void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b, struct cfs_bandwidth *parent)
{
raw_spin_lock_init(&cfs_b->lock);
cfs_b->runtime = 0;
cfs_b->quota = RUNTIME_INF;
cfs_b->period = ns_to_ktime(default_cfs_period());
cfs_b->burst = 0;
cfs_b->hierarchical_quota = parent ? parent->hierarchical_quota : RUNTIME_INF;
INIT_LIST_HEAD(&cfs_b->throttled_cfs_rq);
hrtimer_init(&cfs_b->period_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
cfs_b->period_timer.function = sched_cfs_period_timer;
hrtimer_set_expires(&cfs_b->period_timer,
get_random_u32_below(cfs_b->period));
hrtimer_init(&cfs_b->slack_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
cfs_b->slack_timer.function = sched_cfs_slack_timer;
cfs_b->slack_started = false;
}
static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
cfs_rq->runtime_enabled = 0;
INIT_LIST_HEAD(&cfs_rq->throttled_list);
#ifdef CONFIG_SMP
INIT_LIST_HEAD(&cfs_rq->throttled_csd_list);
#endif
}
void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
{
lockdep_assert_held(&cfs_b->lock);
if (cfs_b->period_active)
return;
cfs_b->period_active = 1;
hrtimer_forward_now(&cfs_b->period_timer, cfs_b->period);
hrtimer_start_expires(&cfs_b->period_timer, HRTIMER_MODE_ABS_PINNED);
}
static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
{
int __maybe_unused i;
if (!cfs_b->throttled_cfs_rq.next)
return;
hrtimer_cancel(&cfs_b->period_timer);
hrtimer_cancel(&cfs_b->slack_timer);
#ifdef CONFIG_SMP
for_each_possible_cpu(i) {
struct rq *rq = cpu_rq(i);
unsigned long flags;
if (list_empty(&rq->cfsb_csd_list))
continue;
local_irq_save(flags);
__cfsb_csd_unthrottle(rq);
local_irq_restore(flags);
}
#endif
}
static void __maybe_unused update_runtime_enabled(struct rq *rq)
{
struct task_group *tg;
lockdep_assert_rq_held(rq);
rcu_read_lock();
list_for_each_entry_rcu(tg, &task_groups, list) {
struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];
raw_spin_lock(&cfs_b->lock);
cfs_rq->runtime_enabled = cfs_b->quota != RUNTIME_INF;
raw_spin_unlock(&cfs_b->lock);
}
rcu_read_unlock();
}
static void __maybe_unused unthrottle_offline_cfs_rqs(struct rq *rq)
{
struct task_group *tg;
lockdep_assert_rq_held(rq);
rq_clock_start_loop_update(rq);
rcu_read_lock();
list_for_each_entry_rcu(tg, &task_groups, list) {
struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];
if (!cfs_rq->runtime_enabled)
continue;
cfs_rq->runtime_remaining = 1;
cfs_rq->runtime_enabled = 0;
if (cfs_rq_throttled(cfs_rq))
unthrottle_cfs_rq(cfs_rq);
}
rcu_read_unlock();
rq_clock_stop_loop_update(rq);
}
bool cfs_task_bw_constrained(struct task_struct *p)
{
struct cfs_rq *cfs_rq = task_cfs_rq(p);
if (!cfs_bandwidth_used())
return false;
if (cfs_rq->runtime_enabled ||
tg_cfs_bandwidth(cfs_rq->tg)->hierarchical_quota != RUNTIME_INF)
return true;
return false;
}
#ifdef CONFIG_NO_HZ_FULL
static void sched_fair_update_stop_tick(struct rq *rq, struct task_struct *p)
{
int cpu = cpu_of(rq);
if (!sched_feat(HZ_BW) || !cfs_bandwidth_used())
return;
if (!tick_nohz_full_cpu(cpu))
return;
if (rq->nr_running != 1)
return;
if (cfs_task_bw_constrained(p))
tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED);
}
#endif
#else /* CONFIG_CFS_BANDWIDTH */
static inline bool cfs_bandwidth_used(void)
{
return false;
}
static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec) {}
static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq) { return false; }
static void check_enqueue_throttle(struct cfs_rq *cfs_rq) {}
static inline void sync_throttle(struct task_group *tg, int cpu) {}
static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
{
return 0;
}
static inline int throttled_hierarchy(struct cfs_rq *cfs_rq)
{
return 0;
}
static inline int throttled_lb_pair(struct task_group *tg,
int src_cpu, int dest_cpu)
{
return 0;
}
#ifdef CONFIG_FAIR_GROUP_SCHED
void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b, struct cfs_bandwidth *parent) {}
static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
#endif
static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
{
return NULL;
}
static inline void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
static inline void update_runtime_enabled(struct rq *rq) {}
static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {}
#ifdef CONFIG_CGROUP_SCHED
bool cfs_task_bw_constrained(struct task_struct *p)
{
return false;
}
#endif
#endif /* CONFIG_CFS_BANDWIDTH */
#if !defined(CONFIG_CFS_BANDWIDTH) || !defined(CONFIG_NO_HZ_FULL)
static inline void sched_fair_update_stop_tick(struct rq *rq, struct task_struct *p) {}
#endif
#ifdef CONFIG_SCHED_HRTICK
static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
{
struct sched_entity *se = &p->se;
SCHED_WARN_ON(task_rq(p) != rq);
if (rq->cfs.h_nr_running > 1) {
u64 ran = se->sum_exec_runtime - se->prev_sum_exec_runtime;
u64 slice = se->slice;
s64 delta = slice - ran;
if (delta < 0) {
if (task_current(rq, p))
resched_curr(rq);
return;
}
hrtick_start(rq, delta);
}
}
static void hrtick_update(struct rq *rq)
{
struct task_struct *curr = rq->curr;
if (!hrtick_enabled_fair(rq) || curr->sched_class != &fair_sched_class)
return;
hrtick_start_fair(rq, curr);
}
#else /* !CONFIG_SCHED_HRTICK */
static inline void
hrtick_start_fair(struct rq *rq, struct task_struct *p)
{
}
static inline void hrtick_update(struct rq *rq)
{
}
#endif
#ifdef CONFIG_SMP
static inline bool cpu_overutilized(int cpu)
{
unsigned long rq_util_min = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MIN);
unsigned long rq_util_max = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MAX);
return !util_fits_cpu(cpu_util_cfs(cpu), rq_util_min, rq_util_max, cpu);
}
static inline void update_overutilized_status(struct rq *rq)
{
if (!READ_ONCE(rq->rd->overutilized) && cpu_overutilized(rq->cpu)) {
WRITE_ONCE(rq->rd->overutilized, SG_OVERUTILIZED);
trace_sched_overutilized_tp(rq->rd, SG_OVERUTILIZED);
}
}
#else
static inline void update_overutilized_status(struct rq *rq) { }
#endif
static int sched_idle_rq(struct rq *rq)
{
return unlikely(rq->nr_running == rq->cfs.idle_h_nr_running &&
rq->nr_running);
}
#ifdef CONFIG_SMP
static int sched_idle_cpu(int cpu)
{
return sched_idle_rq(cpu_rq(cpu));
}
#endif
static void
enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
{
struct cfs_rq *cfs_rq;
struct sched_entity *se = &p->se;
int idle_h_nr_running = task_has_idle_policy(p);
int task_new = !(flags & ENQUEUE_WAKEUP);
util_est_enqueue(&rq->cfs, p);
if (p->in_iowait)
cpufreq_update_util(rq, SCHED_CPUFREQ_IOWAIT);
for_each_sched_entity(se) {
if (se->on_rq)
break;
cfs_rq = cfs_rq_of(se);
enqueue_entity(cfs_rq, se, flags);
cfs_rq->h_nr_running++;
cfs_rq->idle_h_nr_running += idle_h_nr_running;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = 1;
if (cfs_rq_throttled(cfs_rq))
goto enqueue_throttle;
flags = ENQUEUE_WAKEUP;
}
for_each_sched_entity(se) {
cfs_rq = cfs_rq_of(se);
update_load_avg(cfs_rq, se, UPDATE_TG);
se_update_runnable(se);
update_cfs_group(se);
cfs_rq->h_nr_running++;
cfs_rq->idle_h_nr_running += idle_h_nr_running;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = 1;
if (cfs_rq_throttled(cfs_rq))
goto enqueue_throttle;
}
add_nr_running(rq, 1);
if (!task_new)
update_overutilized_status(rq);
enqueue_throttle:
assert_list_leaf_cfs_rq(rq);
hrtick_update(rq);
}
static void set_next_buddy(struct sched_entity *se);
static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
{
struct cfs_rq *cfs_rq;
struct sched_entity *se = &p->se;
int task_sleep = flags & DEQUEUE_SLEEP;
int idle_h_nr_running = task_has_idle_policy(p);
bool was_sched_idle = sched_idle_rq(rq);
util_est_dequeue(&rq->cfs, p);
for_each_sched_entity(se) {
cfs_rq = cfs_rq_of(se);
dequeue_entity(cfs_rq, se, flags);
cfs_rq->h_nr_running--;
cfs_rq->idle_h_nr_running -= idle_h_nr_running;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = 1;
if (cfs_rq_throttled(cfs_rq))
goto dequeue_throttle;
if (cfs_rq->load.weight) {
se = parent_entity(se);
if (task_sleep && se && !throttled_hierarchy(cfs_rq))
set_next_buddy(se);
break;
}
flags |= DEQUEUE_SLEEP;
}
for_each_sched_entity(se) {
cfs_rq = cfs_rq_of(se);
update_load_avg(cfs_rq, se, UPDATE_TG);
se_update_runnable(se);
update_cfs_group(se);
cfs_rq->h_nr_running--;
cfs_rq->idle_h_nr_running -= idle_h_nr_running;
if (cfs_rq_is_idle(cfs_rq))
idle_h_nr_running = 1;
if (cfs_rq_throttled(cfs_rq))
goto dequeue_throttle;
}
sub_nr_running(rq, 1);
if (unlikely(!was_sched_idle && sched_idle_rq(rq)))
rq->next_balance = jiffies;
dequeue_throttle:
util_est_update(&rq->cfs, p, task_sleep);
hrtick_update(rq);
}
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(cpumask_var_t, load_balance_mask);
static DEFINE_PER_CPU(cpumask_var_t, select_rq_mask);
static DEFINE_PER_CPU(cpumask_var_t, should_we_balance_tmpmask);
#ifdef CONFIG_NO_HZ_COMMON
static struct {
cpumask_var_t idle_cpus_mask;
atomic_t nr_cpus;
int has_blocked;
int needs_update;
unsigned long next_balance;
unsigned long next_blocked;
} nohz ____cacheline_aligned;
#endif /* CONFIG_NO_HZ_COMMON */
static unsigned long cpu_load(struct rq *rq)
{
return cfs_rq_load_avg(&rq->cfs);
}
static unsigned long cpu_load_without(struct rq *rq, struct task_struct *p)
{
struct cfs_rq *cfs_rq;
unsigned int load;
if (cpu_of(rq) != task_cpu(p) || !READ_ONCE(p->se.avg.last_update_time))
return cpu_load(rq);
cfs_rq = &rq->cfs;
load = READ_ONCE(cfs_rq->avg.load_avg);
lsub_positive(&load, task_h_load(p));
return load;
}
static unsigned long cpu_runnable(struct rq *rq)
{
return cfs_rq_runnable_avg(&rq->cfs);
}
static unsigned long cpu_runnable_without(struct rq *rq, struct task_struct *p)
{
struct cfs_rq *cfs_rq;
unsigned int runnable;
if (cpu_of(rq) != task_cpu(p) || !READ_ONCE(p->se.avg.last_update_time))
return cpu_runnable(rq);
cfs_rq = &rq->cfs;
runnable = READ_ONCE(cfs_rq->avg.runnable_avg);
lsub_positive(&runnable, p->se.avg.runnable_avg);
return runnable;
}
static unsigned long capacity_of(int cpu)
{
return cpu_rq(cpu)->cpu_capacity;
}
static void record_wakee(struct task_struct *p)
{
if (time_after(jiffies, current->wakee_flip_decay_ts + HZ)) {
current->wakee_flips >>= 1;
current->wakee_flip_decay_ts = jiffies;
}
if (current->last_wakee != p) {
current->last_wakee = p;
current->wakee_flips++;
}
}
static int wake_wide(struct task_struct *p)
{
unsigned int master = current->wakee_flips;
unsigned int slave = p->wakee_flips;
int factor = __this_cpu_read(sd_llc_size);
if (master < slave)
swap(master, slave);
if (slave < factor || master < slave * factor)
return 0;
return 1;
}
static int
wake_affine_idle(int this_cpu, int prev_cpu, int sync)
{
if (available_idle_cpu(this_cpu) && cpus_share_cache(this_cpu, prev_cpu))
return available_idle_cpu(prev_cpu) ? prev_cpu : this_cpu;
if (sync && cpu_rq(this_cpu)->nr_running == 1)
return this_cpu;
if (available_idle_cpu(prev_cpu))
return prev_cpu;
return nr_cpumask_bits;
}
static int
wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
int this_cpu, int prev_cpu, int sync)
{
s64 this_eff_load, prev_eff_load;
unsigned long task_load;
this_eff_load = cpu_load(cpu_rq(this_cpu));
if (sync) {
unsigned long current_load = task_h_load(current);
if (current_load > this_eff_load)
return this_cpu;
this_eff_load -= current_load;
}
task_load = task_h_load(p);
this_eff_load += task_load;
if (sched_feat(WA_BIAS))
this_eff_load *= 100;
this_eff_load *= capacity_of(prev_cpu);
prev_eff_load = cpu_load(cpu_rq(prev_cpu));
prev_eff_load -= task_load;
if (sched_feat(WA_BIAS))
prev_eff_load *= 100 + (sd->imbalance_pct - 100) / 2;
prev_eff_load *= capacity_of(this_cpu);
if (sync)
prev_eff_load += 1;
return this_eff_load < prev_eff_load ? this_cpu : nr_cpumask_bits;
}
static int wake_affine(struct sched_domain *sd, struct task_struct *p,
int this_cpu, int prev_cpu, int sync)
{
int target = nr_cpumask_bits;
if (sched_feat(WA_IDLE))
target = wake_affine_idle(this_cpu, prev_cpu, sync);
if (sched_feat(WA_WEIGHT) && target == nr_cpumask_bits)
target = wake_affine_weight(sd, p, this_cpu, prev_cpu, sync);
schedstat_inc(p->stats.nr_wakeups_affine_attempts);
if (target != this_cpu)
return prev_cpu;
schedstat_inc(sd->ttwu_move_affine);
schedstat_inc(p->stats.nr_wakeups_affine);
return target;
}
static struct sched_group *
find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu);
static int
find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
{
unsigned long load, min_load = ULONG_MAX;
unsigned int min_exit_latency = UINT_MAX;
u64 latest_idle_timestamp = 0;
int least_loaded_cpu = this_cpu;
int shallowest_idle_cpu = -1;
int i;
if (group->group_weight == 1)
return cpumask_first(sched_group_span(group));
for_each_cpu_and(i, sched_group_span(group), p->cpus_ptr) {
struct rq *rq = cpu_rq(i);
if (!sched_core_cookie_match(rq, p))
continue;
if (sched_idle_cpu(i))
return i;
if (available_idle_cpu(i)) {
struct cpuidle_state *idle = idle_get_state(rq);
if (idle && idle->exit_latency < min_exit_latency) {
min_exit_latency = idle->exit_latency;
latest_idle_timestamp = rq->idle_stamp;
shallowest_idle_cpu = i;
} else if ((!idle || idle->exit_latency == min_exit_latency) &&
rq->idle_stamp > latest_idle_timestamp) {
latest_idle_timestamp = rq->idle_stamp;
shallowest_idle_cpu = i;
}
} else if (shallowest_idle_cpu == -1) {
load = cpu_load(cpu_rq(i));
if (load < min_load) {
min_load = load;
least_loaded_cpu = i;
}
}
}
return shallowest_idle_cpu != -1 ? shallowest_idle_cpu : least_loaded_cpu;
}
static inline int find_idlest_cpu(struct sched_domain *sd, struct task_struct *p,
int cpu, int prev_cpu, int sd_flag)
{
int new_cpu = cpu;
if (!cpumask_intersects(sched_domain_span(sd), p->cpus_ptr))
return prev_cpu;
if (!(sd_flag & SD_BALANCE_FORK))
sync_entity_load_avg(&p->se);
while (sd) {
struct sched_group *group;
struct sched_domain *tmp;
int weight;
if (!(sd->flags & sd_flag)) {
sd = sd->child;
continue;
}
group = find_idlest_group(sd, p, cpu);
if (!group) {
sd = sd->child;
continue;
}
new_cpu = find_idlest_group_cpu(group, p, cpu);
if (new_cpu == cpu) {
sd = sd->child;
continue;
}
cpu = new_cpu;
weight = sd->span_weight;
sd = NULL;
for_each_domain(cpu, tmp) {
if (weight <= tmp->span_weight)
break;
if (tmp->flags & sd_flag)
sd = tmp;
}
}
return new_cpu;
}
static inline int __select_idle_cpu(int cpu, struct task_struct *p)
{
if ((available_idle_cpu(cpu) || sched_idle_cpu(cpu)) &&
sched_cpu_cookie_match(cpu_rq(cpu), p))
return cpu;
return -1;
}
#ifdef CONFIG_SCHED_SMT
DEFINE_STATIC_KEY_FALSE(sched_smt_present);
EXPORT_SYMBOL_GPL(sched_smt_present);
static inline void set_idle_cores(int cpu, int val)
{
struct sched_domain_shared *sds;
sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));
if (sds)
WRITE_ONCE(sds->has_idle_cores, val);
}
static inline bool test_idle_cores(int cpu)
{
struct sched_domain_shared *sds;
sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));
if (sds)
return READ_ONCE(sds->has_idle_cores);
return false;
}
void __update_idle_core(struct rq *rq)
{
int core = cpu_of(rq);
int cpu;
rcu_read_lock();
if (test_idle_cores(core))
goto unlock;
for_each_cpu(cpu, cpu_smt_mask(core)) {
if (cpu == core)
continue;
if (!available_idle_cpu(cpu))
goto unlock;
}
set_idle_cores(core, 1);
unlock:
rcu_read_unlock();
}
static int select_idle_core(struct task_struct *p, int core, struct cpumask *cpus, int *idle_cpu)
{
bool idle = true;
int cpu;
for_each_cpu(cpu, cpu_smt_mask(core)) {
if (!available_idle_cpu(cpu)) {
idle = false;
if (*idle_cpu == -1) {
if (sched_idle_cpu(cpu) && cpumask_test_cpu(cpu, p->cpus_ptr)) {
*idle_cpu = cpu;
break;
}
continue;
}
break;
}
if (*idle_cpu == -1 && cpumask_test_cpu(cpu, p->cpus_ptr))
*idle_cpu = cpu;
}
if (idle)
return core;
cpumask_andnot(cpus, cpus, cpu_smt_mask(core));
return -1;
}
static int select_idle_smt(struct task_struct *p, int target)
{
int cpu;
for_each_cpu_and(cpu, cpu_smt_mask(target), p->cpus_ptr) {
if (cpu == target)
continue;
if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
return cpu;
}
return -1;
}
#else /* CONFIG_SCHED_SMT */
static inline void set_idle_cores(int cpu, int val)
{
}
static inline bool test_idle_cores(int cpu)
{
return false;
}
static inline int select_idle_core(struct task_struct *p, int core, struct cpumask *cpus, int *idle_cpu)
{
return __select_idle_cpu(core, p);
}
static inline int select_idle_smt(struct task_struct *p, int target)
{
return -1;
}
#endif /* CONFIG_SCHED_SMT */
static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, bool has_idle_core, int target)
{
struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_rq_mask);
int i, cpu, idle_cpu = -1, nr = INT_MAX;
struct sched_domain_shared *sd_share;
struct rq *this_rq = this_rq();
int this = smp_processor_id();
struct sched_domain *this_sd = NULL;
u64 time = 0;
cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
if (sched_feat(SIS_PROP) && !has_idle_core) {
u64 avg_cost, avg_idle, span_avg;
unsigned long now = jiffies;
this_sd = rcu_dereference(*this_cpu_ptr(&sd_llc));
if (!this_sd)
return -1;
if (unlikely(this_rq->wake_stamp < now)) {
while (this_rq->wake_stamp < now && this_rq->wake_avg_idle) {
this_rq->wake_stamp++;
this_rq->wake_avg_idle >>= 1;
}
}
avg_idle = this_rq->wake_avg_idle;
avg_cost = this_sd->avg_scan_cost + 1;
span_avg = sd->span_weight * avg_idle;
if (span_avg > 4*avg_cost)
nr = div_u64(span_avg, avg_cost);
else
nr = 4;
time = cpu_clock(this);
}
if (sched_feat(SIS_UTIL)) {
sd_share = rcu_dereference(per_cpu(sd_llc_shared, target));
if (sd_share) {
nr = READ_ONCE(sd_share->nr_idle_scan) + 1;
if (nr == 1)
return -1;
}
}
for_each_cpu_wrap(cpu, cpus, target + 1) {
if (has_idle_core) {
i = select_idle_core(p, cpu, cpus, &idle_cpu);
if ((unsigned int)i < nr_cpumask_bits)
return i;
} else {
if (!--nr)
return -1;
idle_cpu = __select_idle_cpu(cpu, p);
if ((unsigned int)idle_cpu < nr_cpumask_bits)
break;
}
}
if (has_idle_core)
set_idle_cores(target, false);
if (sched_feat(SIS_PROP) && this_sd && !has_idle_core) {
time = cpu_clock(this) - time;
this_rq->wake_avg_idle -= min(this_rq->wake_avg_idle, time);
update_avg(&this_sd->avg_scan_cost, time);
}
return idle_cpu;
}
static int
select_idle_capacity(struct task_struct *p, struct sched_domain *sd, int target)
{
unsigned long task_util, util_min, util_max, best_cap = 0;
int fits, best_fits = 0;
int cpu, best_cpu = -1;
struct cpumask *cpus;
cpus = this_cpu_cpumask_var_ptr(select_rq_mask);
cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
task_util = task_util_est(p);
util_min = uclamp_eff_value(p, UCLAMP_MIN);
util_max = uclamp_eff_value(p, UCLAMP_MAX);
for_each_cpu_wrap(cpu, cpus, target) {
unsigned long cpu_cap = capacity_of(cpu);
if (!available_idle_cpu(cpu) && !sched_idle_cpu(cpu))
continue;
fits = util_fits_cpu(task_util, util_min, util_max, cpu);
if (fits > 0)
return cpu;
else if (fits < 0)
cpu_cap = capacity_orig_of(cpu) - thermal_load_avg(cpu_rq(cpu));
if ((fits < best_fits) ||
((fits == best_fits) && (cpu_cap > best_cap))) {
best_cap = cpu_cap;
best_cpu = cpu;
best_fits = fits;
}
}
return best_cpu;
}
static inline bool asym_fits_cpu(unsigned long util,
unsigned long util_min,
unsigned long util_max,
int cpu)
{
if (sched_asym_cpucap_active())
return (util_fits_cpu(util, util_min, util_max, cpu) > 0);
return true;
}
static int select_idle_sibling(struct task_struct *p, int prev, int target)
{
bool has_idle_core = false;
struct sched_domain *sd;
unsigned long task_util, util_min, util_max;
int i, recent_used_cpu;
if (sched_asym_cpucap_active()) {
sync_entity_load_avg(&p->se);
task_util = task_util_est(p);
util_min = uclamp_eff_value(p, UCLAMP_MIN);
util_max = uclamp_eff_value(p, UCLAMP_MAX);
}
lockdep_assert_irqs_disabled();
if ((available_idle_cpu(target) || sched_idle_cpu(target)) &&
asym_fits_cpu(task_util, util_min, util_max, target))
return target;
if (prev != target && cpus_share_cache(prev, target) &&
(available_idle_cpu(prev) || sched_idle_cpu(prev)) &&
asym_fits_cpu(task_util, util_min, util_max, prev))
return prev;
if (is_per_cpu_kthread(current) &&
in_task() &&
prev == smp_processor_id() &&
this_rq()->nr_running <= 1 &&
asym_fits_cpu(task_util, util_min, util_max, prev)) {
return prev;
}
recent_used_cpu = p->recent_used_cpu;
p->recent_used_cpu = prev;
if (recent_used_cpu != prev &&
recent_used_cpu != target &&
cpus_share_cache(recent_used_cpu, target) &&
(available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
cpumask_test_cpu(recent_used_cpu, p->cpus_ptr) &&
asym_fits_cpu(task_util, util_min, util_max, recent_used_cpu)) {
return recent_used_cpu;
}
if (sched_asym_cpucap_active()) {
sd = rcu_dereference(per_cpu(sd_asym_cpucapacity, target));
if (sd) {
i = select_idle_capacity(p, sd, target);
return ((unsigned)i < nr_cpumask_bits) ? i : target;
}
}
sd = rcu_dereference(per_cpu(sd_llc, target));
if (!sd)
return target;
if (sched_smt_active()) {
has_idle_core = test_idle_cores(target);
if (!has_idle_core && cpus_share_cache(prev, target)) {
i = select_idle_smt(p, prev);
if ((unsigned int)i < nr_cpumask_bits)
return i;
}
}
i = select_idle_cpu(p, sd, has_idle_core, target);
if ((unsigned)i < nr_cpumask_bits)
return i;
return target;
}
static unsigned long
cpu_util(int cpu, struct task_struct *p, int dst_cpu, int boost)
{
struct cfs_rq *cfs_rq = &cpu_rq(cpu)->cfs;
unsigned long util = READ_ONCE(cfs_rq->avg.util_avg);
unsigned long runnable;
if (boost) {
runnable = READ_ONCE(cfs_rq->avg.runnable_avg);
util = max(util, runnable);
}
if (p && task_cpu(p) == cpu && dst_cpu != cpu)
lsub_positive(&util, task_util(p));
else if (p && task_cpu(p) != cpu && dst_cpu == cpu)
util += task_util(p);
if (sched_feat(UTIL_EST)) {
unsigned long util_est;
util_est = READ_ONCE(cfs_rq->avg.util_est.enqueued);
if (dst_cpu == cpu)
util_est += _task_util_est(p);
else if (p && unlikely(task_on_rq_queued(p) || current == p))
lsub_positive(&util_est, _task_util_est(p));
util = max(util, util_est);
}
return min(util, capacity_orig_of(cpu));
}
unsigned long cpu_util_cfs(int cpu)
{
return cpu_util(cpu, NULL, -1, 0);
}
unsigned long cpu_util_cfs_boost(int cpu)
{
return cpu_util(cpu, NULL, -1, 1);
}
static unsigned long cpu_util_without(int cpu, struct task_struct *p)
{
if (cpu != task_cpu(p) || !READ_ONCE(p->se.avg.last_update_time))
p = NULL;
return cpu_util(cpu, p, -1, 0);
}
struct energy_env {
unsigned long task_busy_time;
unsigned long pd_busy_time;
unsigned long cpu_cap;
unsigned long pd_cap;
};
static inline void eenv_task_busy_time(struct energy_env *eenv,
struct task_struct *p, int prev_cpu)
{
unsigned long busy_time, max_cap = arch_scale_cpu_capacity(prev_cpu);
unsigned long irq = cpu_util_irq(cpu_rq(prev_cpu));
if (unlikely(irq >= max_cap))
busy_time = max_cap;
else
busy_time = scale_irq_capacity(task_util_est(p), irq, max_cap);
eenv->task_busy_time = busy_time;
}
static inline void eenv_pd_busy_time(struct energy_env *eenv,
struct cpumask *pd_cpus,
struct task_struct *p)
{
unsigned long busy_time = 0;
int cpu;
for_each_cpu(cpu, pd_cpus) {
unsigned long util = cpu_util(cpu, p, -1, 0);
busy_time += effective_cpu_util(cpu, util, ENERGY_UTIL, NULL);
}
eenv->pd_busy_time = min(eenv->pd_cap, busy_time);
}
static inline unsigned long
eenv_pd_max_util(struct energy_env *eenv, struct cpumask *pd_cpus,
struct task_struct *p, int dst_cpu)
{
unsigned long max_util = 0;
int cpu;
for_each_cpu(cpu, pd_cpus) {
struct task_struct *tsk = (cpu == dst_cpu) ? p : NULL;
unsigned long util = cpu_util(cpu, p, dst_cpu, 1);
unsigned long eff_util;
eff_util = effective_cpu_util(cpu, util, FREQUENCY_UTIL, tsk);
max_util = max(max_util, eff_util);
}
return min(max_util, eenv->cpu_cap);
}
static inline unsigned long
compute_energy(struct energy_env *eenv, struct perf_domain *pd,
struct cpumask *pd_cpus, struct task_struct *p, int dst_cpu)
{
unsigned long max_util = eenv_pd_max_util(eenv, pd_cpus, p, dst_cpu);
unsigned long busy_time = eenv->pd_busy_time;
if (dst_cpu >= 0)
busy_time = min(eenv->pd_cap, busy_time + eenv->task_busy_time);
return em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
}
static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
{
struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_rq_mask);
unsigned long prev_delta = ULONG_MAX, best_delta = ULONG_MAX;
unsigned long p_util_min = uclamp_is_used() ? uclamp_eff_value(p, UCLAMP_MIN) : 0;
unsigned long p_util_max = uclamp_is_used() ? uclamp_eff_value(p, UCLAMP_MAX) : 1024;
struct root_domain *rd = this_rq()->rd;
int cpu, best_energy_cpu, target = -1;
int prev_fits = -1, best_fits = -1;
unsigned long best_thermal_cap = 0;
unsigned long prev_thermal_cap = 0;
struct sched_domain *sd;
struct perf_domain *pd;
struct energy_env eenv;
rcu_read_lock();
pd = rcu_dereference(rd->pd);
if (!pd || READ_ONCE(rd->overutilized))
goto unlock;
sd = rcu_dereference(*this_cpu_ptr(&sd_asym_cpucapacity));
while (sd && !cpumask_test_cpu(prev_cpu, sched_domain_span(sd)))
sd = sd->parent;
if (!sd)
goto unlock;
target = prev_cpu;
sync_entity_load_avg(&p->se);
if (!uclamp_task_util(p, p_util_min, p_util_max))
goto unlock;
eenv_task_busy_time(&eenv, p, prev_cpu);
for (; pd; pd = pd->next) {
unsigned long util_min = p_util_min, util_max = p_util_max;
unsigned long cpu_cap, cpu_thermal_cap, util;
unsigned long cur_delta, max_spare_cap = 0;
unsigned long rq_util_min, rq_util_max;
unsigned long prev_spare_cap = 0;
int max_spare_cap_cpu = -1;
unsigned long base_energy;
int fits, max_fits = -1;
cpumask_and(cpus, perf_domain_span(pd), cpu_online_mask);
if (cpumask_empty(cpus))
continue;
cpu = cpumask_first(cpus);
cpu_thermal_cap = arch_scale_cpu_capacity(cpu);
cpu_thermal_cap -= arch_scale_thermal_pressure(cpu);
eenv.cpu_cap = cpu_thermal_cap;
eenv.pd_cap = 0;
for_each_cpu(cpu, cpus) {
struct rq *rq = cpu_rq(cpu);
eenv.pd_cap += cpu_thermal_cap;
if (!cpumask_test_cpu(cpu, sched_domain_span(sd)))
continue;
if (!cpumask_test_cpu(cpu, p->cpus_ptr))
continue;
util = cpu_util(cpu, p, cpu, 0);
cpu_cap = capacity_of(cpu);
if (uclamp_is_used() && !uclamp_rq_is_idle(rq)) {
rq_util_min = uclamp_rq_get(rq, UCLAMP_MIN);
rq_util_max = uclamp_rq_get(rq, UCLAMP_MAX);
util_min = max(rq_util_min, p_util_min);
util_max = max(rq_util_max, p_util_max);
}
fits = util_fits_cpu(util, util_min, util_max, cpu);
if (!fits)
continue;
lsub_positive(&cpu_cap, util);
if (cpu == prev_cpu) {
prev_spare_cap = cpu_cap;
prev_fits = fits;
} else if ((fits > max_fits) ||
((fits == max_fits) && (cpu_cap > max_spare_cap))) {
max_spare_cap = cpu_cap;
max_spare_cap_cpu = cpu;
max_fits = fits;
}
}
if (max_spare_cap_cpu < 0 && prev_spare_cap == 0)
continue;
eenv_pd_busy_time(&eenv, cpus, p);
base_energy = compute_energy(&eenv, pd, cpus, p, -1);
if (prev_spare_cap > 0) {
prev_delta = compute_energy(&eenv, pd, cpus, p,
prev_cpu);
if (prev_delta < base_energy)
goto unlock;
prev_delta -= base_energy;
prev_thermal_cap = cpu_thermal_cap;
best_delta = min(best_delta, prev_delta);
}
if (max_spare_cap_cpu >= 0 && max_spare_cap > prev_spare_cap) {
if (max_fits < best_fits)
continue;
if ((max_fits < 0) &&
(cpu_thermal_cap <= best_thermal_cap))
continue;
cur_delta = compute_energy(&eenv, pd, cpus, p,
max_spare_cap_cpu);
if (cur_delta < base_energy)
goto unlock;
cur_delta -= base_energy;
if ((max_fits > 0) && (best_fits > 0) &&
(cur_delta >= best_delta))
continue;
best_delta = cur_delta;
best_energy_cpu = max_spare_cap_cpu;
best_fits = max_fits;
best_thermal_cap = cpu_thermal_cap;
}
}
rcu_read_unlock();
if ((best_fits > prev_fits) ||
((best_fits > 0) && (best_delta < prev_delta)) ||
((best_fits < 0) && (best_thermal_cap > prev_thermal_cap)))
target = best_energy_cpu;
return target;
unlock:
rcu_read_unlock();
return target;
}
static int
select_task_rq_fair(struct task_struct *p, int prev_cpu, int wake_flags)
{
int sync = (wake_flags & WF_SYNC) && !(current->flags & PF_EXITING);
struct sched_domain *tmp, *sd = NULL;
int cpu = smp_processor_id();
int new_cpu = prev_cpu;
int want_affine = 0;
int sd_flag = wake_flags & 0xF;
lockdep_assert_held(&p->pi_lock);
if (wake_flags & WF_TTWU) {
record_wakee(p);
if ((wake_flags & WF_CURRENT_CPU) &&
cpumask_test_cpu(cpu, p->cpus_ptr))
return cpu;
if (sched_energy_enabled()) {
new_cpu = find_energy_efficient_cpu(p, prev_cpu);
if (new_cpu >= 0)
return new_cpu;
new_cpu = prev_cpu;
}
want_affine = !wake_wide(p) && cpumask_test_cpu(cpu, p->cpus_ptr);
}
rcu_read_lock();
for_each_domain(cpu, tmp) {
if (want_affine && (tmp->flags & SD_WAKE_AFFINE) &&
cpumask_test_cpu(prev_cpu, sched_domain_span(tmp))) {
if (cpu != prev_cpu)
new_cpu = wake_affine(tmp, p, cpu, prev_cpu, sync);
sd = NULL;
break;
}
if