}
}
+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) \
{
}
+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
if (cpu == sibling)
continue;
- if (!idle_cpu(cpu))
+ if (!idle_cpu(sibling))
return false;
}
#endif
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;
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;
}
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;
- cfs_rq = cfs_rq_of(se);
- enqueue_entity(cfs_rq, se, ENQUEUE_WAKEUP);
+ enqueue_entity(qcfs_rq, se, ENQUEUE_WAKEUP);
+
+ if (cfs_rq_is_idle(group_cfs_rq(se)))
+ idle_task_delta = cfs_rq->h_nr_running;
- cfs_rq->h_nr_running += task_delta;
- cfs_rq->idle_h_nr_running += idle_task_delta;
+ qcfs_rq->h_nr_running += task_delta;
+ qcfs_rq->idle_h_nr_running += idle_task_delta;
/* end evaluation on encountering a throttled cfs_rq */
- if (cfs_rq_throttled(cfs_rq))
+ if (cfs_rq_throttled(qcfs_rq))
goto unthrottle_throttle;
}
for_each_sched_entity(se) {
- cfs_rq = cfs_rq_of(se);
+ struct cfs_rq *qcfs_rq = cfs_rq_of(se);
- update_load_avg(cfs_rq, se, UPDATE_TG);
+ update_load_avg(qcfs_rq, se, UPDATE_TG);
se_update_runnable(se);
- cfs_rq->h_nr_running += task_delta;
- cfs_rq->idle_h_nr_running += idle_task_delta;
+ 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;
/* end evaluation on encountering a throttled cfs_rq */
- if (cfs_rq_throttled(cfs_rq))
+ if (cfs_rq_throttled(qcfs_rq))
goto unthrottle_throttle;
/*
* One parent has been throttled and cfs_rq removed from the
* list. Add it back to not break the leaf list.
*/
- if (throttled_hierarchy(cfs_rq))
- list_add_leaf_cfs_rq(cfs_rq);
+ if (throttled_hierarchy(qcfs_rq))
+ list_add_leaf_cfs_rq(qcfs_rq);
}
/* At this point se is NULL and we are at root level*/
* assertion below.
*/
for_each_sched_entity(se) {
- cfs_rq = cfs_rq_of(se);
+ struct cfs_rq *qcfs_rq = cfs_rq_of(se);
- if (list_add_leaf_cfs_rq(cfs_rq))
+ if (list_add_leaf_cfs_rq(qcfs_rq))
break;
}
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;
+
/* end evaluation on encountering a throttled cfs_rq */
if (cfs_rq_throttled(cfs_rq))
goto enqueue_throttle;
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;
+
/* end evaluation on encountering a throttled cfs_rq */
if (cfs_rq_throttled(cfs_rq))
goto enqueue_throttle;
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;
+
/* end evaluation on encountering a throttled cfs_rq */
if (cfs_rq_throttled(cfs_rq))
goto dequeue_throttle;
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;
+
/* end evaluation on encountering a throttled cfs_rq */
if (cfs_rq_throttled(cfs_rq))
goto dequeue_throttle;
time = cpu_clock(this);
}
- for_each_cpu_wrap(cpu, cpus, target) {
+ 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)
/* Check a recently used CPU as a potential idle candidate: */
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) &&
} else if (wake_flags & WF_TTWU) { /* XXX always ? */
/* Fast path */
new_cpu = select_idle_sibling(p, prev_cpu, new_cpu);
-
- if (want_affine)
- current->recent_used_cpu = cpu;
}
rcu_read_unlock();
static void set_last_buddy(struct sched_entity *se)
{
- if (entity_is_task(se) && unlikely(task_has_idle_policy(task_of(se))))
- return;
-
for_each_sched_entity(se) {
if (SCHED_WARN_ON(!se->on_rq))
return;
+ if (se_is_idle(se))
+ return;
cfs_rq_of(se)->last = se;
}
}
static void set_next_buddy(struct sched_entity *se)
{
- if (entity_is_task(se) && unlikely(task_has_idle_policy(task_of(se))))
- return;
-
for_each_sched_entity(se) {
if (SCHED_WARN_ON(!se->on_rq))
return;
+ if (se_is_idle(se))
+ return;
cfs_rq_of(se)->next = se;
}
}
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
int scale = cfs_rq->nr_running >= sched_nr_latency;
int next_buddy_marked = 0;
+ int cse_is_idle, pse_is_idle;
if (unlikely(se == pse))
return;
return;
find_matching_se(&se, &pse);
- update_curr(cfs_rq_of(se));
BUG_ON(!pse);
+
+ cse_is_idle = se_is_idle(se);
+ pse_is_idle = se_is_idle(pse);
+
+ /*
+ * Preempt an idle group in favor of a non-idle group (and don't preempt
+ * in the inverse case).
+ */
+ if (cse_is_idle && !pse_is_idle)
+ goto preempt;
+ if (cse_is_idle != pse_is_idle)
+ return;
+
+ update_curr(cfs_rq_of(se));
if (wakeup_preempt_entity(se, pse) == 1) {
/*
* Bias pick_next to pick the sched entity that is
static inline int find_new_ilb(void)
{
int ilb;
+ const struct cpumask *hk_mask;
+
+ hk_mask = housekeeping_cpumask(HK_FLAG_MISC);
- for_each_cpu_and(ilb, nohz.idle_cpus_mask,
- housekeeping_cpumask(HK_FLAG_MISC)) {
+ for_each_cpu_and(ilb, nohz.idle_cpus_mask, hk_mask) {
if (ilb == smp_processor_id())
continue;
static DEFINE_MUTEX(shares_mutex);
-int sched_group_set_shares(struct task_group *tg, unsigned long shares)
+static int __sched_group_set_shares(struct task_group *tg, unsigned long shares)
{
int i;
+ lockdep_assert_held(&shares_mutex);
+
/*
* We can't change the weight of the root cgroup.
*/
shares = clamp(shares, scale_load(MIN_SHARES), scale_load(MAX_SHARES));
- mutex_lock(&shares_mutex);
if (tg->shares == shares)
- goto done;
+ return 0;
tg->shares = shares;
for_each_possible_cpu(i) {
rq_unlock_irqrestore(rq, &rf);
}
-done:
+ return 0;
+}
+
+int sched_group_set_shares(struct task_group *tg, unsigned long shares)
+{
+ int ret;
+
+ mutex_lock(&shares_mutex);
+ if (tg_is_idle(tg))
+ ret = -EINVAL;
+ else
+ ret = __sched_group_set_shares(tg, shares);
+ mutex_unlock(&shares_mutex);
+
+ return ret;
+}
+
+int sched_group_set_idle(struct task_group *tg, long idle)
+{
+ int i;
+
+ if (tg == &root_task_group)
+ return -EINVAL;
+
+ if (idle < 0 || idle > 1)
+ return -EINVAL;
+
+ mutex_lock(&shares_mutex);
+
+ if (tg->idle == idle) {
+ mutex_unlock(&shares_mutex);
+ return 0;
+ }
+
+ tg->idle = idle;
+
+ for_each_possible_cpu(i) {
+ struct rq *rq = cpu_rq(i);
+ struct sched_entity *se = tg->se[i];
+ struct cfs_rq *grp_cfs_rq = tg->cfs_rq[i];
+ bool was_idle = cfs_rq_is_idle(grp_cfs_rq);
+ long idle_task_delta;
+ struct rq_flags rf;
+
+ rq_lock_irqsave(rq, &rf);
+
+ grp_cfs_rq->idle = idle;
+ if (WARN_ON_ONCE(was_idle == cfs_rq_is_idle(grp_cfs_rq)))
+ goto next_cpu;
+
+ idle_task_delta = grp_cfs_rq->h_nr_running -
+ grp_cfs_rq->idle_h_nr_running;
+ if (!cfs_rq_is_idle(grp_cfs_rq))
+ idle_task_delta *= -1;
+
+ for_each_sched_entity(se) {
+ struct cfs_rq *cfs_rq = cfs_rq_of(se);
+
+ if (!se->on_rq)
+ break;
+
+ cfs_rq->idle_h_nr_running += idle_task_delta;
+
+ /* Already accounted at parent level and above. */
+ if (cfs_rq_is_idle(cfs_rq))
+ break;
+ }
+
+next_cpu:
+ rq_unlock_irqrestore(rq, &rf);
+ }
+
+ /* Idle groups have minimum weight. */
+ if (tg_is_idle(tg))
+ __sched_group_set_shares(tg, scale_load(WEIGHT_IDLEPRIO));
+ else
+ __sched_group_set_shares(tg, NICE_0_LOAD);
+
mutex_unlock(&shares_mutex);
return 0;
}
+
#else /* CONFIG_FAIR_GROUP_SCHED */
void free_fair_sched_group(struct task_group *tg) { }
projects / linux-2.6-microblaze.git / blobdiff