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sched/deadline: Move DL related code from sched/core.c to sched/deadline.c

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This helps making sched/core.c smaller and hopefully easier to understand and maintain.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170621182203.30626-2-nicolas.pitre@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Nicolas Pitre 2017-06-21 14:22:01 -04:00 • committed by Ingo Molnar
parent e1d4eeec5a
commit 06a76fe08d
3 changed files with 364 additions and 340 deletions
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343
kernel/sched/core.c
View file

@ -2139,25 +2139,6 @@ int wake_up_state(struct task_struct *p, unsigned int state)
return try_to_wake_up(p, state, 0); return try_to_wake_up(p, state, 0);
} }
/*
* This function clears the sched_dl_entity static params.
*/
void __dl_clear_params(struct task_struct *p)
{
struct sched_dl_entity *dl_se = &p->dl;
dl_se->dl_runtime = 0;
dl_se->dl_deadline = 0;
dl_se->dl_period = 0;
dl_se->flags = 0;
dl_se->dl_bw = 0;
dl_se->dl_density = 0;
dl_se->dl_throttled = 0;
dl_se->dl_yielded = 0;
dl_se->dl_non_contending = 0;
}
/* /*
* Perform scheduler related setup for a newly forked process p. * Perform scheduler related setup for a newly forked process p.
* p is forked by current. * p is forked by current.
@ -2438,101 +2419,6 @@ unsigned long to_ratio(u64 period, u64 runtime)
return div64_u64(runtime << BW_SHIFT, period); return div64_u64(runtime << BW_SHIFT, period);
} }
#ifdef CONFIG_SMP
inline struct dl_bw *dl_bw_of(int i)
{
RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
"sched RCU must be held");
return &cpu_rq(i)->rd->dl_bw;
}
inline int dl_bw_cpus(int i)
{
struct root_domain *rd = cpu_rq(i)->rd;
int cpus = 0;
RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
"sched RCU must be held");
for_each_cpu_and(i, rd->span, cpu_active_mask)
cpus++;
return cpus;
}
#else
inline struct dl_bw *dl_bw_of(int i)
{
return &cpu_rq(i)->dl.dl_bw;
}
inline int dl_bw_cpus(int i)
{
return 1;
}
#endif
/*
* We must be sure that accepting a new task (or allowing changing the
* parameters of an existing one) is consistent with the bandwidth
* constraints. If yes, this function also accordingly updates the currently
* allocated bandwidth to reflect the new situation.
*
* This function is called while holding p's rq->lock.
*/
static int dl_overflow(struct task_struct *p, int policy,
const struct sched_attr *attr)
{
struct dl_bw *dl_b = dl_bw_of(task_cpu(p));
u64 period = attr->sched_period ?: attr->sched_deadline;
u64 runtime = attr->sched_runtime;
u64 new_bw = dl_policy(policy) ? to_ratio(period, runtime) : 0;
int cpus, err = -1;
/* !deadline task may carry old deadline bandwidth */
if (new_bw == p->dl.dl_bw && task_has_dl_policy(p))
return 0;
/*
* Either if a task, enters, leave, or stays -deadline but changes
* its parameters, we may need to update accordingly the total
* allocated bandwidth of the container.
*/
raw_spin_lock(&dl_b->lock);
cpus = dl_bw_cpus(task_cpu(p));
if (dl_policy(policy) && !task_has_dl_policy(p) &&
!__dl_overflow(dl_b, cpus, 0, new_bw)) {
if (hrtimer_active(&p->dl.inactive_timer))
__dl_clear(dl_b, p->dl.dl_bw, cpus);
__dl_add(dl_b, new_bw, cpus);
err = 0;
} else if (dl_policy(policy) && task_has_dl_policy(p) &&
!__dl_overflow(dl_b, cpus, p->dl.dl_bw, new_bw)) {
/*
* XXX this is slightly incorrect: when the task
* utilization decreases, we should delay the total
* utilization change until the task's 0-lag point.
* But this would require to set the task's "inactive
* timer" when the task is not inactive.
*/
__dl_clear(dl_b, p->dl.dl_bw, cpus);
__dl_add(dl_b, new_bw, cpus);
dl_change_utilization(p, new_bw);
err = 0;
} else if (!dl_policy(policy) && task_has_dl_policy(p)) {
/*
* Do not decrease the total deadline utilization here,
* switched_from_dl() will take care to do it at the correct
* (0-lag) time.
*/
err = 0;
}
raw_spin_unlock(&dl_b->lock);
return err;
}
extern void init_dl_bw(struct dl_bw *dl_b);
/* /*
* wake_up_new_task - wake up a newly created task for the first time. * wake_up_new_task - wake up a newly created task for the first time.
* *
@ -4014,27 +3900,6 @@ static struct task_struct *find_process_by_pid(pid_t pid)
return pid ? find_task_by_vpid(pid) : current; return pid ? find_task_by_vpid(pid) : current;
} }
/*
* This function initializes the sched_dl_entity of a newly becoming
* SCHED_DEADLINE task.
*
* Only the static values are considered here, the actual runtime and the
* absolute deadline will be properly calculated when the task is enqueued
* for the first time with its new policy.
*/
static void
__setparam_dl(struct task_struct *p, const struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
dl_se->dl_runtime = attr->sched_runtime;
dl_se->dl_deadline = attr->sched_deadline;
dl_se->dl_period = attr->sched_period ?: dl_se->dl_deadline;
dl_se->flags = attr->sched_flags;
dl_se->dl_bw = to_ratio(dl_se->dl_period, dl_se->dl_runtime);
dl_se->dl_density = to_ratio(dl_se->dl_deadline, dl_se->dl_runtime);
}
/* /*
* sched_setparam() passes in -1 for its policy, to let the functions * sched_setparam() passes in -1 for its policy, to let the functions
* it calls know not to change it. * it calls know not to change it.
@ -4088,59 +3953,6 @@ static void __setscheduler(struct rq *rq, struct task_struct *p,
p->sched_class = &fair_sched_class; p->sched_class = &fair_sched_class;
} }
static void
__getparam_dl(struct task_struct *p, struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
attr->sched_priority = p->rt_priority;
attr->sched_runtime = dl_se->dl_runtime;
attr->sched_deadline = dl_se->dl_deadline;
attr->sched_period = dl_se->dl_period;
attr->sched_flags = dl_se->flags;
}
/*
* This function validates the new parameters of a -deadline task.
* We ask for the deadline not being zero, and greater or equal
* than the runtime, as well as the period of being zero or
* greater than deadline. Furthermore, we have to be sure that
* user parameters are above the internal resolution of 1us (we
* check sched_runtime only since it is always the smaller one) and
* below 2^63 ns (we have to check both sched_deadline and
* sched_period, as the latter can be zero).
*/
static bool
__checkparam_dl(const struct sched_attr *attr)
{
/* deadline != 0 */
if (attr->sched_deadline == 0)
return false;
/*
* Since we truncate DL_SCALE bits, make sure we're at least
* that big.
*/
if (attr->sched_runtime < (1ULL << DL_SCALE))
return false;
/*
* Since we use the MSB for wrap-around and sign issues, make
* sure it's not set (mind that period can be equal to zero).
*/
if (attr->sched_deadline & (1ULL << 63) ||
attr->sched_period & (1ULL << 63))
return false;
/* runtime <= deadline <= period (if period != 0) */
if ((attr->sched_period != 0 &&
attr->sched_period < attr->sched_deadline) ||
attr->sched_deadline < attr->sched_runtime)
return false;
return true;
}
/* /*
* Check the target process has a UID that matches the current process's: * Check the target process has a UID that matches the current process's:
*/ */
@ -4157,19 +3969,6 @@ static bool check_same_owner(struct task_struct *p)
return match; return match;
} }
static bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
if (dl_se->dl_runtime != attr->sched_runtime ||
dl_se->dl_deadline != attr->sched_deadline ||
dl_se->dl_period != attr->sched_period ||
dl_se->flags != attr->sched_flags)
return true;
return false;
}
static int __sched_setscheduler(struct task_struct *p, static int __sched_setscheduler(struct task_struct *p,
const struct sched_attr *attr, const struct sched_attr *attr,
bool user, bool pi) bool user, bool pi)
@ -4350,7 +4149,7 @@ change:
* of a SCHED_DEADLINE task) we need to check if enough bandwidth * of a SCHED_DEADLINE task) we need to check if enough bandwidth
* is available. * is available.
*/ */
if ((dl_policy(policy) || dl_task(p)) && dl_overflow(p, policy, attr)) { if ((dl_policy(policy) || dl_task(p)) && sched_dl_overflow(p, policy, attr)) {
task_rq_unlock(rq, p, &rf); task_rq_unlock(rq, p, &rf);
return -EBUSY; return -EBUSY;
} }
@ -5456,23 +5255,12 @@ void init_idle(struct task_struct *idle, int cpu)
int cpuset_cpumask_can_shrink(const struct cpumask *cur, int cpuset_cpumask_can_shrink(const struct cpumask *cur,
const struct cpumask *trial) const struct cpumask *trial)
{ {
int ret = 1, trial_cpus; int ret = 1;
struct dl_bw *cur_dl_b;
unsigned long flags;
if (!cpumask_weight(cur)) if (!cpumask_weight(cur))
return ret; return ret;
rcu_read_lock_sched(); ret = dl_cpuset_cpumask_can_shrink(cur, trial);
cur_dl_b = dl_bw_of(cpumask_any(cur));
trial_cpus = cpumask_weight(trial);
raw_spin_lock_irqsave(&cur_dl_b->lock, flags);
if (cur_dl_b->bw != -1 &&
cur_dl_b->bw * trial_cpus < cur_dl_b->total_bw)
ret = 0;
raw_spin_unlock_irqrestore(&cur_dl_b->lock, flags);
rcu_read_unlock_sched();
return ret; return ret;
} }
@ -5497,34 +5285,8 @@ int task_can_attach(struct task_struct *p,
} }
if (dl_task(p) && !cpumask_intersects(task_rq(p)->rd->span, if (dl_task(p) && !cpumask_intersects(task_rq(p)->rd->span,
cs_cpus_allowed)) { cs_cpus_allowed))
unsigned int dest_cpu = cpumask_any_and(cpu_active_mask, ret = dl_task_can_attach(p, cs_cpus_allowed);
cs_cpus_allowed);
struct dl_bw *dl_b;
bool overflow;
int cpus;
unsigned long flags;
rcu_read_lock_sched();
dl_b = dl_bw_of(dest_cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
cpus = dl_bw_cpus(dest_cpu);
overflow = __dl_overflow(dl_b, cpus, 0, p->dl.dl_bw);
if (overflow)
ret = -EBUSY;
else {
/*
* We reserve space for this task in the destination
* root_domain, as we can't fail after this point.
* We will free resources in the source root_domain
* later on (see set_cpus_allowed_dl()).
*/
__dl_add(dl_b, p->dl.dl_bw, cpus);
}
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
}
out: out:
return ret; return ret;
@ -5792,23 +5554,8 @@ static void cpuset_cpu_active(void)
static int cpuset_cpu_inactive(unsigned int cpu) static int cpuset_cpu_inactive(unsigned int cpu)
{ {
unsigned long flags;
struct dl_bw *dl_b;
bool overflow;
int cpus;
if (!cpuhp_tasks_frozen) { if (!cpuhp_tasks_frozen) {
rcu_read_lock_sched(); if (dl_cpu_busy(cpu))
dl_b = dl_bw_of(cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
cpus = dl_bw_cpus(cpu);
overflow = __dl_overflow(dl_b, cpus, 0, 0);
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
if (overflow)
return -EBUSY; return -EBUSY;
cpuset_update_active_cpus(); cpuset_update_active_cpus();
} else { } else {
@ -6711,84 +6458,6 @@ static int sched_rt_global_constraints(void)
} }
#endif /* CONFIG_RT_GROUP_SCHED */ #endif /* CONFIG_RT_GROUP_SCHED */
static int sched_dl_global_validate(void)
{
u64 runtime = global_rt_runtime();
u64 period = global_rt_period();
u64 new_bw = to_ratio(period, runtime);
struct dl_bw *dl_b;
int cpu, ret = 0;
unsigned long flags;
/*
* Here we want to check the bandwidth not being set to some
* value smaller than the currently allocated bandwidth in
* any of the root_domains.
*
* FIXME: Cycling on all the CPUs is overdoing, but simpler than
* cycling on root_domains... Discussion on different/better
* solutions is welcome!
*/
for_each_possible_cpu(cpu) {
rcu_read_lock_sched();
dl_b = dl_bw_of(cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
if (new_bw < dl_b->total_bw)
ret = -EBUSY;
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
if (ret)
break;
}
return ret;
}
void init_dl_rq_bw_ratio(struct dl_rq *dl_rq)
{
if (global_rt_runtime() == RUNTIME_INF) {
dl_rq->bw_ratio = 1 << RATIO_SHIFT;
dl_rq->extra_bw = 1 << BW_SHIFT;
} else {
dl_rq->bw_ratio = to_ratio(global_rt_runtime(),
global_rt_period()) >> (BW_SHIFT - RATIO_SHIFT);
dl_rq->extra_bw = to_ratio(global_rt_period(),
global_rt_runtime());
}
}
static void sched_dl_do_global(void)
{
u64 new_bw = -1;
struct dl_bw *dl_b;
int cpu;
unsigned long flags;
def_dl_bandwidth.dl_period = global_rt_period();
def_dl_bandwidth.dl_runtime = global_rt_runtime();
if (global_rt_runtime() != RUNTIME_INF)
new_bw = to_ratio(global_rt_period(), global_rt_runtime());
/*
* FIXME: As above...
*/
for_each_possible_cpu(cpu) {
rcu_read_lock_sched();
dl_b = dl_bw_of(cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
dl_b->bw = new_bw;
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
init_dl_rq_bw_ratio(&cpu_rq(cpu)->dl);
}
}
static int sched_rt_global_validate(void) static int sched_rt_global_validate(void)
{ {
if (sysctl_sched_rt_period <= 0) if (sysctl_sched_rt_period <= 0)

344
kernel/sched/deadline.c
View file

@ -17,6 +17,7 @@
#include "sched.h" #include "sched.h"
#include <linux/slab.h> #include <linux/slab.h>
#include <uapi/linux/sched/types.h>
struct dl_bandwidth def_dl_bandwidth; struct dl_bandwidth def_dl_bandwidth;
@ -43,6 +44,38 @@ static inline int on_dl_rq(struct sched_dl_entity *dl_se)
return !RB_EMPTY_NODE(&dl_se->rb_node); return !RB_EMPTY_NODE(&dl_se->rb_node);
} }
#ifdef CONFIG_SMP
static inline struct dl_bw *dl_bw_of(int i)
{
RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
"sched RCU must be held");
return &cpu_rq(i)->rd->dl_bw;
}
static inline int dl_bw_cpus(int i)
{
struct root_domain *rd = cpu_rq(i)->rd;
int cpus = 0;
RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
"sched RCU must be held");
for_each_cpu_and(i, rd->span, cpu_active_mask)
cpus++;
return cpus;
}
#else
static inline struct dl_bw *dl_bw_of(int i)
{
return &cpu_rq(i)->dl.dl_bw;
}
static inline int dl_bw_cpus(int i)
{
return 1;
}
#endif
static inline static inline
void add_running_bw(u64 dl_bw, struct dl_rq *dl_rq) void add_running_bw(u64 dl_bw, struct dl_rq *dl_rq)
{ {
@ -2318,6 +2351,317 @@ const struct sched_class dl_sched_class = {
.update_curr = update_curr_dl, .update_curr = update_curr_dl,
}; };
int sched_dl_global_validate(void)
{
u64 runtime = global_rt_runtime();
u64 period = global_rt_period();
u64 new_bw = to_ratio(period, runtime);
struct dl_bw *dl_b;
int cpu, ret = 0;
unsigned long flags;
/*
* Here we want to check the bandwidth not being set to some
* value smaller than the currently allocated bandwidth in
* any of the root_domains.
*
* FIXME: Cycling on all the CPUs is overdoing, but simpler than
* cycling on root_domains... Discussion on different/better
* solutions is welcome!
*/
for_each_possible_cpu(cpu) {
rcu_read_lock_sched();
dl_b = dl_bw_of(cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
if (new_bw < dl_b->total_bw)
ret = -EBUSY;
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
if (ret)
break;
}
return ret;
}
void init_dl_rq_bw_ratio(struct dl_rq *dl_rq)
{
if (global_rt_runtime() == RUNTIME_INF) {
dl_rq->bw_ratio = 1 << RATIO_SHIFT;
dl_rq->extra_bw = 1 << BW_SHIFT;
} else {
dl_rq->bw_ratio = to_ratio(global_rt_runtime(),
global_rt_period()) >> (BW_SHIFT - RATIO_SHIFT);
dl_rq->extra_bw = to_ratio(global_rt_period(),
global_rt_runtime());
}
}
void sched_dl_do_global(void)
{
u64 new_bw = -1;
struct dl_bw *dl_b;
int cpu;
unsigned long flags;
def_dl_bandwidth.dl_period = global_rt_period();
def_dl_bandwidth.dl_runtime = global_rt_runtime();
if (global_rt_runtime() != RUNTIME_INF)
new_bw = to_ratio(global_rt_period(), global_rt_runtime());
/*
* FIXME: As above...
*/
for_each_possible_cpu(cpu) {
rcu_read_lock_sched();
dl_b = dl_bw_of(cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
dl_b->bw = new_bw;
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
init_dl_rq_bw_ratio(&cpu_rq(cpu)->dl);
}
}
/*
* We must be sure that accepting a new task (or allowing changing the
* parameters of an existing one) is consistent with the bandwidth
* constraints. If yes, this function also accordingly updates the currently
* allocated bandwidth to reflect the new situation.
*
* This function is called while holding p's rq->lock.
*/
int sched_dl_overflow(struct task_struct *p, int policy,
const struct sched_attr *attr)
{
struct dl_bw *dl_b = dl_bw_of(task_cpu(p));
u64 period = attr->sched_period ?: attr->sched_deadline;
u64 runtime = attr->sched_runtime;
u64 new_bw = dl_policy(policy) ? to_ratio(period, runtime) : 0;
int cpus, err = -1;
/* !deadline task may carry old deadline bandwidth */
if (new_bw == p->dl.dl_bw && task_has_dl_policy(p))
return 0;
/*
* Either if a task, enters, leave, or stays -deadline but changes
* its parameters, we may need to update accordingly the total
* allocated bandwidth of the container.
*/
raw_spin_lock(&dl_b->lock);
cpus = dl_bw_cpus(task_cpu(p));
if (dl_policy(policy) && !task_has_dl_policy(p) &&
!__dl_overflow(dl_b, cpus, 0, new_bw)) {
if (hrtimer_active(&p->dl.inactive_timer))
__dl_clear(dl_b, p->dl.dl_bw, cpus);
__dl_add(dl_b, new_bw, cpus);
err = 0;
} else if (dl_policy(policy) && task_has_dl_policy(p) &&
!__dl_overflow(dl_b, cpus, p->dl.dl_bw, new_bw)) {
/*
* XXX this is slightly incorrect: when the task
* utilization decreases, we should delay the total
* utilization change until the task's 0-lag point.
* But this would require to set the task's "inactive
* timer" when the task is not inactive.
*/
__dl_clear(dl_b, p->dl.dl_bw, cpus);
__dl_add(dl_b, new_bw, cpus);
dl_change_utilization(p, new_bw);
err = 0;
} else if (!dl_policy(policy) && task_has_dl_policy(p)) {
/*
* Do not decrease the total deadline utilization here,
* switched_from_dl() will take care to do it at the correct
* (0-lag) time.
*/
err = 0;
}
raw_spin_unlock(&dl_b->lock);
return err;
}
/*
* This function initializes the sched_dl_entity of a newly becoming
* SCHED_DEADLINE task.
*
* Only the static values are considered here, the actual runtime and the
* absolute deadline will be properly calculated when the task is enqueued
* for the first time with its new policy.
*/
void __setparam_dl(struct task_struct *p, const struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
dl_se->dl_runtime = attr->sched_runtime;
dl_se->dl_deadline = attr->sched_deadline;
dl_se->dl_period = attr->sched_period ?: dl_se->dl_deadline;
dl_se->flags = attr->sched_flags;
dl_se->dl_bw = to_ratio(dl_se->dl_period, dl_se->dl_runtime);
dl_se->dl_density = to_ratio(dl_se->dl_deadline, dl_se->dl_runtime);
}
void __getparam_dl(struct task_struct *p, struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
attr->sched_priority = p->rt_priority;
attr->sched_runtime = dl_se->dl_runtime;
attr->sched_deadline = dl_se->dl_deadline;
attr->sched_period = dl_se->dl_period;
attr->sched_flags = dl_se->flags;
}
/*
* This function validates the new parameters of a -deadline task.
* We ask for the deadline not being zero, and greater or equal
* than the runtime, as well as the period of being zero or
* greater than deadline. Furthermore, we have to be sure that
* user parameters are above the internal resolution of 1us (we
* check sched_runtime only since it is always the smaller one) and
* below 2^63 ns (we have to check both sched_deadline and
* sched_period, as the latter can be zero).
*/
bool __checkparam_dl(const struct sched_attr *attr)
{
/* deadline != 0 */
if (attr->sched_deadline == 0)
return false;
/*
* Since we truncate DL_SCALE bits, make sure we're at least
* that big.
*/
if (attr->sched_runtime < (1ULL << DL_SCALE))
return false;
/*
* Since we use the MSB for wrap-around and sign issues, make
* sure it's not set (mind that period can be equal to zero).
*/
if (attr->sched_deadline & (1ULL << 63) ||
attr->sched_period & (1ULL << 63))
return false;
/* runtime <= deadline <= period (if period != 0) */
if ((attr->sched_period != 0 &&
attr->sched_period < attr->sched_deadline) ||
attr->sched_deadline < attr->sched_runtime)
return false;
return true;
}
/*
* This function clears the sched_dl_entity static params.
*/
void __dl_clear_params(struct task_struct *p)
{
struct sched_dl_entity *dl_se = &p->dl;
dl_se->dl_runtime = 0;
dl_se->dl_deadline = 0;
dl_se->dl_period = 0;
dl_se->flags = 0;
dl_se->dl_bw = 0;
dl_se->dl_density = 0;
dl_se->dl_throttled = 0;
dl_se->dl_yielded = 0;
dl_se->dl_non_contending = 0;
}
bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr)
{
struct sched_dl_entity *dl_se = &p->dl;
if (dl_se->dl_runtime != attr->sched_runtime ||
dl_se->dl_deadline != attr->sched_deadline ||
dl_se->dl_period != attr->sched_period ||
dl_se->flags != attr->sched_flags)
return true;
return false;
}
#ifdef CONFIG_SMP
int dl_task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed)
{
unsigned int dest_cpu = cpumask_any_and(cpu_active_mask,
cs_cpus_allowed);
struct dl_bw *dl_b;
bool overflow;
int cpus, ret;
unsigned long flags;
rcu_read_lock_sched();
dl_b = dl_bw_of(dest_cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
cpus = dl_bw_cpus(dest_cpu);
overflow = __dl_overflow(dl_b, cpus, 0, p->dl.dl_bw);
if (overflow)
ret = -EBUSY;
else {
/*
* We reserve space for this task in the destination
* root_domain, as we can't fail after this point.
* We will free resources in the source root_domain
* later on (see set_cpus_allowed_dl()).
*/
__dl_add(dl_b, p->dl.dl_bw, cpus);
ret = 0;
}
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
return ret;
}
int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur,
const struct cpumask *trial)
{
int ret = 1, trial_cpus;
struct dl_bw *cur_dl_b;
unsigned long flags;
rcu_read_lock_sched();
cur_dl_b = dl_bw_of(cpumask_any(cur));
trial_cpus = cpumask_weight(trial);
raw_spin_lock_irqsave(&cur_dl_b->lock, flags);
if (cur_dl_b->bw != -1 &&
cur_dl_b->bw * trial_cpus < cur_dl_b->total_bw)
ret = 0;
raw_spin_unlock_irqrestore(&cur_dl_b->lock, flags);
rcu_read_unlock_sched();
return ret;
}
bool dl_cpu_busy(unsigned int cpu)
{
unsigned long flags;
struct dl_bw *dl_b;
bool overflow;
int cpus;
rcu_read_lock_sched();
dl_b = dl_bw_of(cpu);
raw_spin_lock_irqsave(&dl_b->lock, flags);
cpus = dl_bw_cpus(cpu);
overflow = __dl_overflow(dl_b, cpus, 0, 0);
raw_spin_unlock_irqrestore(&dl_b->lock, flags);
rcu_read_unlock_sched();
return overflow;
}
#endif
#ifdef CONFIG_SCHED_DEBUG #ifdef CONFIG_SCHED_DEBUG
extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq); extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);

17
kernel/sched/sched.h
View file

@ -218,9 +218,6 @@ static inline int dl_bandwidth_enabled(void)
return sysctl_sched_rt_runtime >= 0; return sysctl_sched_rt_runtime >= 0;
} }
extern struct dl_bw *dl_bw_of(int i);
extern int dl_bw_cpus(int i);
struct dl_bw { struct dl_bw {
raw_spinlock_t lock; raw_spinlock_t lock;
u64 bw, total_bw; u64 bw, total_bw;
@ -251,6 +248,20 @@ bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw)
void dl_change_utilization(struct task_struct *p, u64 new_bw); void dl_change_utilization(struct task_struct *p, u64 new_bw);
extern void init_dl_bw(struct dl_bw *dl_b); extern void init_dl_bw(struct dl_bw *dl_b);
extern int sched_dl_global_validate(void);
extern void sched_dl_do_global(void);
extern int sched_dl_overflow(struct task_struct *p, int policy,
const struct sched_attr *attr);
extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr);
extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr);
extern bool __checkparam_dl(const struct sched_attr *attr);
extern void __dl_clear_params(struct task_struct *p);
extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr);
extern int dl_task_can_attach(struct task_struct *p,
const struct cpumask *cs_cpus_allowed);
extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur,
const struct cpumask *trial);
extern bool dl_cpu_busy(unsigned int cpu);
#ifdef CONFIG_CGROUP_SCHED #ifdef CONFIG_CGROUP_SCHED