* 2003-09-03 Interactivity tuning by Con Kolivas.
* 2004-04-02 Scheduler domains code by Nick Piggin
*/
-
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/nmi.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
#include <linux/times.h>
+#include <linux/vserver/sched.h>
+#include <linux/vs_base.h>
+#include <linux/vs_context.h>
+#include <linux/vs_cvirt.h>
#include <asm/tlb.h>
#include <asm/unistd.h>
#define cpu_to_node_mask(cpu) (cpu_online_map)
#endif
+/* used to soft spin in sched while dump is in progress */
+unsigned long dump_oncpu;
+EXPORT_SYMBOL(dump_oncpu);
+
/*
* Convert user-nice values [ -20 ... 0 ... 19 ]
* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
#define LOW_CREDIT(p) \
((p)->interactive_credit < -CREDIT_LIMIT)
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+/*
+ * if belong to different class, compare class priority
+ * otherwise compare task priority
+ */
+#define TASK_PREEMPTS_CURR(p, rq) \
+ ( ((p)->cpu_class != (rq)->curr->cpu_class) \
+ && ((rq)->curr != (rq)->idle) && ((p) != (rq)->idle )) \
+ ? class_preempts_curr((p),(rq)->curr) \
+ : ((p)->prio < (rq)->curr->prio)
+#else
#define TASK_PREEMPTS_CURR(p, rq) \
((p)->prio < (rq)->curr->prio)
+#endif
/*
* task_timeslice() scales user-nice values [ -20 ... 0 ... 19 ]
#define SCALE_PRIO(x, prio) \
max(x * (MAX_PRIO - prio) / (MAX_USER_PRIO/2), MIN_TIMESLICE)
-static unsigned int task_timeslice(task_t *p)
+unsigned int task_timeslice(task_t *p)
{
if (p->static_prio < NICE_TO_PRIO(0))
return SCALE_PRIO(DEF_TIMESLICE*4, p->static_prio);
* These are the runqueue data structures:
*/
-#define BITMAP_SIZE ((((MAX_PRIO+1+7)/8)+sizeof(long)-1)/sizeof(long))
-
typedef struct runqueue runqueue_t;
-
-struct prio_array {
- unsigned int nr_active;
- unsigned long bitmap[BITMAP_SIZE];
- struct list_head queue[MAX_PRIO];
-};
+#include <linux/ckrm_classqueue.h>
+#include <linux/ckrm_sched.h>
/*
* This is the main, per-CPU runqueue data structure.
unsigned long long timestamp_last_tick;
task_t *curr, *idle;
struct mm_struct *prev_mm;
- prio_array_t *active, *expired, arrays[2];
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ struct classqueue_struct classqueue;
+ ckrm_load_t ckrm_load;
+#else
+ prio_array_t *active, *expired, arrays[2];
+#endif
int best_expired_prio;
atomic_t nr_iowait;
struct list_head migration_queue;
#endif
+#ifdef CONFIG_VSERVER_HARDCPU
+ struct list_head hold_queue;
+ int idle_tokens;
+#endif
+
#ifdef CONFIG_SCHEDSTATS
/* latency stats */
struct sched_info rq_sched_info;
/*
* CPU power of this group, SCHED_LOAD_SCALE being max power for a
- * single CPU. This should be read only (except for setup). Although
- * it will need to be written to at cpu hot(un)plug time, perhaps the
- * cpucontrol semaphore will provide enough exclusion?
+ * single CPU. This is read only (except for setup, hotplug CPU).
*/
unsigned long cpu_power;
};
#define sched_info_switch(t, next) do { } while (0)
#endif /* CONFIG_SCHEDSTATS */
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+static inline ckrm_lrq_t *rq_get_next_class(struct runqueue *rq)
+{
+ cq_node_t *node = classqueue_get_head(&rq->classqueue);
+ return ((node) ? class_list_entry(node) : NULL);
+}
+
+/*
+ * return the cvt of the current running class
+ * if no current running class, return 0
+ * assume cpu is valid (cpu_online(cpu) == 1)
+ */
+CVT_t get_local_cur_cvt(int cpu)
+{
+ ckrm_lrq_t * lrq = rq_get_next_class(cpu_rq(cpu));
+
+ if (lrq)
+ return lrq->local_cvt;
+ else
+ return 0;
+}
+
+static inline struct task_struct * rq_get_next_task(struct runqueue* rq)
+{
+ prio_array_t *array;
+ struct task_struct *next;
+ ckrm_lrq_t *queue;
+ int idx;
+ int cpu = smp_processor_id();
+
+ // it is guaranteed be the ( rq->nr_running > 0 ) check in
+ // schedule that a task will be found.
+
+ retry_next_class:
+ queue = rq_get_next_class(rq);
+ // BUG_ON( !queue );
+
+ array = queue->active;
+ if (unlikely(!array->nr_active)) {
+ queue->active = queue->expired;
+ queue->expired = array;
+ queue->expired_timestamp = 0;
+
+ schedstat_inc(rq, sched_switch);
+ if (queue->active->nr_active)
+ set_top_priority(queue,
+ find_first_bit(queue->active->bitmap, MAX_PRIO));
+ else {
+ classqueue_dequeue(queue->classqueue,
+ &queue->classqueue_linkobj);
+ cpu_demand_event(get_rq_local_stat(queue,cpu),CPU_DEMAND_DEQUEUE,0);
+ }
+ goto retry_next_class;
+ } else
+ schedstat_inc(rq, sched_noswitch);
+ // BUG_ON(!array->nr_active);
+
+ idx = queue->top_priority;
+ // BUG_ON (idx == MAX_PRIO);
+ next = task_list_entry(array->queue[idx].next);
+ return next;
+}
+#else /*! CONFIG_CKRM_CPU_SCHEDULE*/
+static inline struct task_struct * rq_get_next_task(struct runqueue* rq)
+{
+ prio_array_t *array;
+ struct list_head *queue;
+ int idx;
+
+ array = rq->active;
+ if (unlikely(!array->nr_active)) {
+ /*
+ * Switch the active and expired arrays.
+ */
+ schedstat_inc(rq, sched_switch);
+ rq->active = rq->expired;
+ rq->expired = array;
+ array = rq->active;
+ rq->expired_timestamp = 0;
+ rq->best_expired_prio = MAX_PRIO;
+ } else
+ schedstat_inc(rq, sched_noswitch);
+
+ idx = sched_find_first_bit(array->bitmap);
+ queue = array->queue + idx;
+ return list_entry(queue->next, task_t, run_list);
+}
+
+static inline void class_enqueue_task(struct task_struct* p, prio_array_t *array) { }
+static inline void class_dequeue_task(struct task_struct* p, prio_array_t *array) { }
+static inline void init_cpu_classes(void) { }
+#define rq_ckrm_load(rq) NULL
+static inline void ckrm_sched_tick(int j,int this_cpu,void* name) {}
+#endif /* CONFIG_CKRM_CPU_SCHEDULE */
+
/*
* Adding/removing a task to/from a priority array:
*/
list_del(&p->run_list);
if (list_empty(array->queue + p->prio))
__clear_bit(p->prio, array->bitmap);
+ class_dequeue_task(p,array);
}
static void enqueue_task(struct task_struct *p, prio_array_t *array)
__set_bit(p->prio, array->bitmap);
array->nr_active++;
p->array = array;
+ class_enqueue_task(p,array);
}
/*
__set_bit(p->prio, array->bitmap);
array->nr_active++;
p->array = array;
+ class_enqueue_task(p,array);
}
/*
bonus = CURRENT_BONUS(p) - MAX_BONUS / 2;
prio = p->static_prio - bonus;
+
+#ifdef CONFIG_VSERVER_HARDCPU
+ if (task_vx_flags(p, VXF_SCHED_PRIO, 0))
+ prio += effective_vavavoom(p, MAX_USER_PRIO);
+#endif
+
if (prio < MAX_RT_PRIO)
prio = MAX_RT_PRIO;
if (prio > MAX_PRIO-1)
*/
static inline void __activate_task(task_t *p, runqueue_t *rq)
{
- enqueue_task(p, rq->active);
+ enqueue_task(p, rq_active(p,rq));
rq->nr_running++;
}
*/
static inline void __activate_idle_task(task_t *p, runqueue_t *rq)
{
- enqueue_task_head(p, rq->active);
+ enqueue_task_head(p, rq_active(p,rq));
rq->nr_running++;
}
}
p->timestamp = now;
+ vx_activate_task(p);
__activate_task(p, rq);
}
/*
* deactivate_task - remove a task from the runqueue.
*/
-static void deactivate_task(struct task_struct *p, runqueue_t *rq)
+static void __deactivate_task(struct task_struct *p, runqueue_t *rq)
{
rq->nr_running--;
if (p->state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible++;
dequeue_task(p, p->array);
+
p->array = NULL;
}
+static void deactivate_task(struct task_struct *p, runqueue_t *rq)
+{
+ __deactivate_task(p, rq);
+ vx_deactivate_task(p);
+}
+
/*
* resched_task - mark a task 'to be rescheduled now'.
*
preempt_enable();
}
-EXPORT_SYMBOL_GPL(kick_process);
-
/*
* Return a low guess at the load of a migration-source cpu.
*
if (!(sd->flags & SD_WAKE_IDLE))
return cpu;
- cpus_and(tmp, sd->span, cpu_online_map);
- cpus_and(tmp, tmp, p->cpus_allowed);
+ cpus_and(tmp, sd->span, p->cpus_allowed);
for_each_cpu_mask(i, tmp) {
if (idle_cpu(i))
#ifdef CONFIG_SCHEDSTATS
memset(&p->sched_info, 0, sizeof(p->sched_info));
#endif
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ cpu_demand_event(&p->demand_stat,CPU_DEMAND_INIT,0);
+#endif
#ifdef CONFIG_PREEMPT
/*
* During context-switch we hold precisely one spinlock, which
p->prio = effective_prio(p);
+ vx_activate_task(p);
if (likely(cpu == this_cpu)) {
if (!(clone_flags & CLONE_VM)) {
/*
p->array = current->array;
p->array->nr_active++;
rq->nr_running++;
+ class_enqueue_task(p,p->array);
}
set_need_resched();
} else
/*
* A task struct has one reference for the use as "current".
- * If a task dies, then it sets TASK_ZOMBIE in tsk->state and calls
- * schedule one last time. The schedule call will never return,
+ * If a task dies, then it sets EXIT_ZOMBIE in tsk->exit_state and
+ * calls schedule one last time. The schedule call will never return,
* and the scheduled task must drop that reference.
- * The test for TASK_ZOMBIE must occur while the runqueue locks are
+ * The test for EXIT_ZOMBIE must occur while the runqueue locks are
* still held, otherwise prev could be scheduled on another cpu, die
* there before we look at prev->state, and then the reference would
* be dropped twice.
min_cpu = UINT_MAX;
min_load = ULONG_MAX;
- cpus_and(mask, sd->span, cpu_online_map);
- cpus_and(mask, mask, p->cpus_allowed);
+ cpus_and(mask, sd->span, p->cpus_allowed);
for_each_cpu_mask(i, mask) {
load = target_load(i);
return 1;
}
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+static inline int ckrm_preferred_task(task_t *tmp,long min, long max,
+ int phase, enum idle_type idle)
+{
+ long pressure = task_load(tmp);
+
+ if (pressure > max)
+ return 0;
+
+ if ((idle == NOT_IDLE) && ! phase && (pressure <= min))
+ return 0;
+ return 1;
+}
+
+/*
+ * move tasks for a specic local class
+ * return number of tasks pulled
+ */
+static inline int ckrm_cls_move_tasks(ckrm_lrq_t* src_lrq,ckrm_lrq_t*dst_lrq,
+ runqueue_t *this_rq,
+ runqueue_t *busiest,
+ struct sched_domain *sd,
+ int this_cpu,
+ enum idle_type idle,
+ long* pressure_imbalance)
+{
+ prio_array_t *array, *dst_array;
+ struct list_head *head, *curr;
+ task_t *tmp;
+ int idx;
+ int pulled = 0;
+ int phase = -1;
+ long pressure_min, pressure_max;
+ /*hzheng: magic : 90% balance is enough*/
+ long balance_min = *pressure_imbalance / 10;
+/*
+ * we don't want to migrate tasks that will reverse the balance
+ * or the tasks that make too small difference
+ */
+#define CKRM_BALANCE_MAX_RATIO 100
+#define CKRM_BALANCE_MIN_RATIO 1
+ start:
+ phase ++;
+ /*
+ * We first consider expired tasks. Those will likely not be
+ * executed in the near future, and they are most likely to
+ * be cache-cold, thus switching CPUs has the least effect
+ * on them.
+ */
+ if (src_lrq->expired->nr_active) {
+ array = src_lrq->expired;
+ dst_array = dst_lrq->expired;
+ } else {
+ array = src_lrq->active;
+ dst_array = dst_lrq->active;
+ }
+
+ new_array:
+ /* Start searching at priority 0: */
+ idx = 0;
+ skip_bitmap:
+ if (!idx)
+ idx = sched_find_first_bit(array->bitmap);
+ else
+ idx = find_next_bit(array->bitmap, MAX_PRIO, idx);
+ if (idx >= MAX_PRIO) {
+ if (array == src_lrq->expired && src_lrq->active->nr_active) {
+ array = src_lrq->active;
+ dst_array = dst_lrq->active;
+ goto new_array;
+ }
+ if ((! phase) && (! pulled) && (idle != IDLE))
+ goto start; //try again
+ else
+ goto out; //finished search for this lrq
+ }
+
+ head = array->queue + idx;
+ curr = head->prev;
+ skip_queue:
+ tmp = list_entry(curr, task_t, run_list);
+
+ curr = curr->prev;
+
+ if (!can_migrate_task(tmp, busiest, this_cpu, sd, idle)) {
+ if (curr != head)
+ goto skip_queue;
+ idx++;
+ goto skip_bitmap;
+ }
+
+ pressure_min = *pressure_imbalance * CKRM_BALANCE_MIN_RATIO/100;
+ pressure_max = *pressure_imbalance * CKRM_BALANCE_MAX_RATIO/100;
+ /*
+ * skip the tasks that will reverse the balance too much
+ */
+ if (ckrm_preferred_task(tmp,pressure_min,pressure_max,phase,idle)) {
+ *pressure_imbalance -= task_load(tmp);
+ pull_task(busiest, array, tmp,
+ this_rq, dst_array, this_cpu);
+ pulled++;
+
+ if (*pressure_imbalance <= balance_min)
+ goto out;
+ }
+
+ if (curr != head)
+ goto skip_queue;
+ idx++;
+ goto skip_bitmap;
+ out:
+ return pulled;
+}
+
+static inline long ckrm_rq_imbalance(runqueue_t *this_rq,runqueue_t *dst_rq)
+{
+ long imbalance;
+ /*
+ * make sure after balance, imbalance' > - imbalance/2
+ * we don't want the imbalance be reversed too much
+ */
+ imbalance = pid_get_pressure(rq_ckrm_load(dst_rq),0)
+ - pid_get_pressure(rq_ckrm_load(this_rq),1);
+ imbalance /= 2;
+ return imbalance;
+}
+
+/*
+ * try to balance the two runqueues
+ *
+ * Called with both runqueues locked.
+ * if move_tasks is called, it will try to move at least one task over
+ */
+static int move_tasks(runqueue_t *this_rq, int this_cpu, runqueue_t *busiest,
+ unsigned long max_nr_move, struct sched_domain *sd,
+ enum idle_type idle)
+{
+ struct ckrm_cpu_class *clsptr,*vip_cls = NULL;
+ ckrm_lrq_t* src_lrq,*dst_lrq;
+ long pressure_imbalance, pressure_imbalance_old;
+ int src_cpu = task_cpu(busiest->curr);
+ struct list_head *list;
+ int pulled = 0;
+ long imbalance;
+
+ imbalance = ckrm_rq_imbalance(this_rq,busiest);
+
+ if ((idle == NOT_IDLE && imbalance <= 0) || busiest->nr_running <= 1)
+ goto out;
+
+ //try to find the vip class
+ list_for_each_entry(clsptr,&active_cpu_classes,links) {
+ src_lrq = get_ckrm_lrq(clsptr,src_cpu);
+
+ if (! lrq_nr_running(src_lrq))
+ continue;
+
+ if (! vip_cls || cpu_class_weight(vip_cls) < cpu_class_weight(clsptr) )
+ {
+ vip_cls = clsptr;
+ }
+ }
+
+ /*
+ * do search from the most significant class
+ * hopefully, less tasks will be migrated this way
+ */
+ clsptr = vip_cls;
+
+ move_class:
+ if (! clsptr)
+ goto out;
+
+
+ src_lrq = get_ckrm_lrq(clsptr,src_cpu);
+ if (! lrq_nr_running(src_lrq))
+ goto other_class;
+
+ dst_lrq = get_ckrm_lrq(clsptr,this_cpu);
+
+ //how much pressure for this class should be transferred
+ pressure_imbalance = src_lrq->lrq_load * imbalance/src_lrq->local_weight;
+ if (pulled && ! pressure_imbalance)
+ goto other_class;
+
+ pressure_imbalance_old = pressure_imbalance;
+
+ //move tasks
+ pulled +=
+ ckrm_cls_move_tasks(src_lrq,dst_lrq,
+ this_rq,
+ busiest,
+ sd,this_cpu,idle,
+ &pressure_imbalance);
+
+ /*
+ * hzheng: 2 is another magic number
+ * stop balancing if the imbalance is less than 25% of the orig
+ */
+ if (pressure_imbalance <= (pressure_imbalance_old >> 2))
+ goto out;
+
+ //update imbalance
+ imbalance *= pressure_imbalance / pressure_imbalance_old;
+ other_class:
+ //who is next?
+ list = clsptr->links.next;
+ if (list == &active_cpu_classes)
+ list = list->next;
+ clsptr = list_entry(list, typeof(*clsptr), links);
+ if (clsptr != vip_cls)
+ goto move_class;
+ out:
+ return pulled;
+}
+
+/**
+ * ckrm_check_balance - is load balancing necessary?
+ * return 0 if load balancing is not necessary
+ * otherwise return the average load of the system
+ * also, update nr_group
+ *
+ * heuristics:
+ * no load balancing if it's load is over average
+ * no load balancing if it's load is far more than the min
+ * task:
+ * read the status of all the runqueues
+ */
+static unsigned long ckrm_check_balance(struct sched_domain *sd, int this_cpu,
+ enum idle_type idle, int* nr_group)
+{
+ struct sched_group *group = sd->groups;
+ unsigned long min_load, max_load, avg_load;
+ unsigned long total_load, this_load, total_pwr;
+
+ max_load = this_load = total_load = total_pwr = 0;
+ min_load = 0xFFFFFFFF;
+ *nr_group = 0;
+
+ do {
+ cpumask_t tmp;
+ unsigned long load;
+ int local_group;
+ int i, nr_cpus = 0;
+
+ /* Tally up the load of all CPUs in the group */
+ cpus_and(tmp, group->cpumask, cpu_online_map);
+ if (unlikely(cpus_empty(tmp)))
+ goto nextgroup;
+
+ avg_load = 0;
+ local_group = cpu_isset(this_cpu, group->cpumask);
+
+ for_each_cpu_mask(i, tmp) {
+ load = pid_get_pressure(rq_ckrm_load(cpu_rq(i)),local_group);
+ nr_cpus++;
+ avg_load += load;
+ }
+
+ if (!nr_cpus)
+ goto nextgroup;
+
+ total_load += avg_load;
+ total_pwr += group->cpu_power;
+
+ /* Adjust by relative CPU power of the group */
+ avg_load = (avg_load * SCHED_LOAD_SCALE) / group->cpu_power;
+
+ if (local_group) {
+ this_load = avg_load;
+ goto nextgroup;
+ } else if (avg_load > max_load) {
+ max_load = avg_load;
+ }
+ if (avg_load < min_load) {
+ min_load = avg_load;
+ }
+nextgroup:
+ group = group->next;
+ *nr_group = *nr_group + 1;
+ } while (group != sd->groups);
+
+ if (!max_load || this_load >= max_load)
+ goto out_balanced;
+
+ avg_load = (SCHED_LOAD_SCALE * total_load) / total_pwr;
+
+ /* hzheng: debugging: 105 is a magic number
+ * 100*max_load <= sd->imbalance_pct*this_load)
+ * should use imbalance_pct instead
+ */
+ if (this_load > avg_load
+ || 100*max_load < 105*this_load
+ || 100*min_load < 70*this_load
+ )
+ goto out_balanced;
+
+ return avg_load;
+ out_balanced:
+ return 0;
+}
+
+/**
+ * any group that has above average load is considered busy
+ * find the busiest queue from any of busy group
+ */
+static runqueue_t *
+ckrm_find_busy_queue(struct sched_domain *sd, int this_cpu,
+ unsigned long avg_load, enum idle_type idle,
+ int nr_group)
+{
+ struct sched_group *group;
+ runqueue_t * busiest=NULL;
+ unsigned long rand;
+
+ group = sd->groups;
+ rand = get_ckrm_rand(nr_group);
+ nr_group = 0;
+
+ do {
+ unsigned long load,total_load,max_load;
+ cpumask_t tmp;
+ int i;
+ runqueue_t * grp_busiest;
+
+ cpus_and(tmp, group->cpumask, cpu_online_map);
+ if (unlikely(cpus_empty(tmp)))
+ goto find_nextgroup;
+
+ total_load = 0;
+ max_load = 0;
+ grp_busiest = NULL;
+ for_each_cpu_mask(i, tmp) {
+ load = pid_get_pressure(rq_ckrm_load(cpu_rq(i)),0);
+ total_load += load;
+ if (load > max_load) {
+ max_load = load;
+ grp_busiest = cpu_rq(i);
+ }
+ }
+
+ total_load = (total_load * SCHED_LOAD_SCALE) / group->cpu_power;
+ if (total_load > avg_load) {
+ busiest = grp_busiest;
+ if (nr_group >= rand)
+ break;
+ }
+ find_nextgroup:
+ group = group->next;
+ nr_group ++;
+ } while (group != sd->groups);
+
+ return busiest;
+}
+
+/**
+ * load_balance - pressure based load balancing algorithm used by ckrm
+ */
+static int ckrm_load_balance(int this_cpu, runqueue_t *this_rq,
+ struct sched_domain *sd, enum idle_type idle)
+{
+ runqueue_t *busiest;
+ unsigned long avg_load;
+ int nr_moved,nr_group;
+
+ avg_load = ckrm_check_balance(sd, this_cpu, idle, &nr_group);
+ if (! avg_load)
+ goto out_balanced;
+
+ busiest = ckrm_find_busy_queue(sd,this_cpu,avg_load,idle,nr_group);
+ if (! busiest)
+ goto out_balanced;
+ /*
+ * This should be "impossible", but since load
+ * balancing is inherently racy and statistical,
+ * it could happen in theory.
+ */
+ if (unlikely(busiest == this_rq)) {
+ WARN_ON(1);
+ goto out_balanced;
+ }
+
+ nr_moved = 0;
+ if (busiest->nr_running > 1) {
+ /*
+ * Attempt to move tasks. If find_busiest_group has found
+ * an imbalance but busiest->nr_running <= 1, the group is
+ * still unbalanced. nr_moved simply stays zero, so it is
+ * correctly treated as an imbalance.
+ */
+ double_lock_balance(this_rq, busiest);
+ nr_moved = move_tasks(this_rq, this_cpu, busiest,
+ 0,sd, idle);
+ spin_unlock(&busiest->lock);
+ if (nr_moved) {
+ adjust_local_weight();
+ }
+ }
+
+ if (!nr_moved)
+ sd->nr_balance_failed ++;
+ else
+ sd->nr_balance_failed = 0;
+
+ /* We were unbalanced, so reset the balancing interval */
+ sd->balance_interval = sd->min_interval;
+
+ return nr_moved;
+
+out_balanced:
+ /* tune up the balancing interval */
+ if (sd->balance_interval < sd->max_interval)
+ sd->balance_interval *= 2;
+
+ return 0;
+}
+
+/*
+ * this_rq->lock is already held
+ */
+static inline int load_balance_newidle(int this_cpu, runqueue_t *this_rq,
+ struct sched_domain *sd)
+{
+ int ret;
+ read_lock(&class_list_lock);
+ ret = ckrm_load_balance(this_cpu,this_rq,sd,NEWLY_IDLE);
+ read_unlock(&class_list_lock);
+ return ret;
+}
+
+static inline int load_balance(int this_cpu, runqueue_t *this_rq,
+ struct sched_domain *sd, enum idle_type idle)
+{
+ int ret;
+
+ spin_lock(&this_rq->lock);
+ read_lock(&class_list_lock);
+ ret= ckrm_load_balance(this_cpu,this_rq,sd,NEWLY_IDLE);
+ read_unlock(&class_list_lock);
+ spin_unlock(&this_rq->lock);
+ return ret;
+}
+#else /*! CONFIG_CKRM_CPU_SCHEDULE */
/*
* move_tasks tries to move up to max_nr_move tasks from busiest to this_rq,
* as part of a balancing operation within "domain". Returns the number of
max_load = this_load = total_load = total_pwr = 0;
do {
- cpumask_t tmp;
unsigned long load;
int local_group;
int i, nr_cpus = 0;
/* Tally up the load of all CPUs in the group */
avg_load = 0;
- cpus_and(tmp, group->cpumask, cpu_online_map);
- if (unlikely(cpus_empty(tmp)))
- goto nextgroup;
- for_each_cpu_mask(i, tmp) {
+ for_each_cpu_mask(i, group->cpumask) {
/* Bias balancing toward cpus of our domain */
if (local_group)
load = target_load(i);
*/
static runqueue_t *find_busiest_queue(struct sched_group *group)
{
- cpumask_t tmp;
unsigned long load, max_load = 0;
runqueue_t *busiest = NULL;
int i;
- cpus_and(tmp, group->cpumask, cpu_online_map);
- for_each_cpu_mask(i, tmp) {
+ for_each_cpu_mask(i, group->cpumask) {
load = source_load(i);
if (load > max_load) {
out:
return nr_moved;
}
+#endif /* CONFIG_CKRM_CPU_SCHEDULE*/
+
/*
* idle_balance is called by schedule() if this_cpu is about to become
group = sd->groups;
do {
- cpumask_t tmp;
runqueue_t *rq;
int push_cpu = 0;
if (group == busy_group)
goto next_group;
- cpus_and(tmp, group->cpumask, cpu_online_map);
- if (!cpus_weight(tmp))
- goto next_group;
-
- for_each_cpu_mask(i, tmp) {
+ for_each_cpu_mask(i, group->cpumask) {
if (!idle_cpu(i))
goto next_group;
push_cpu = i;
}
}
}
-#else
+#else /* SMP*/
/*
* on UP we do not need to balance between CPUs:
*/
}
DEFINE_PER_CPU(struct kernel_stat, kstat);
-
EXPORT_PER_CPU_SYMBOL(kstat);
/*
* increasing number of running tasks. We also ignore the interactivity
* if a better static_prio task has expired:
*/
+
+#ifndef CONFIG_CKRM_CPU_SCHEDULE
#define EXPIRED_STARVING(rq) \
((STARVATION_LIMIT && ((rq)->expired_timestamp && \
(jiffies - (rq)->expired_timestamp >= \
STARVATION_LIMIT * ((rq)->nr_running) + 1))) || \
((rq)->curr->static_prio > (rq)->best_expired_prio))
+#else
+#define EXPIRED_STARVING(rq) \
+ (STARVATION_LIMIT && ((rq)->expired_timestamp && \
+ (jiffies - (rq)->expired_timestamp >= \
+ STARVATION_LIMIT * (lrq_nr_running(rq)) + 1)))
+#endif
/*
* This function gets called by the timer code, with HZ frequency.
struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
runqueue_t *rq = this_rq();
task_t *p = current;
+ struct vx_info *vxi = p->vx_info;
rq->timestamp_last_tick = sched_clock();
if (rcu_pending(cpu))
rcu_check_callbacks(cpu, user_ticks);
+
+ if (vxi) {
+ vxi->sched.cpu[cpu].user_ticks += user_ticks;
+ vxi->sched.cpu[cpu].sys_ticks += sys_ticks;
+ }
+
/* note: this timer irq context must be accounted for as well */
if (hardirq_count() - HARDIRQ_OFFSET) {
cpustat->irq += sys_ticks;
if (p == rq->idle) {
if (atomic_read(&rq->nr_iowait) > 0)
cpustat->iowait += sys_ticks;
+ // vx_cpustat_acc(vxi, iowait, cpu, cpustat, sys_ticks);
else
cpustat->idle += sys_ticks;
+ // vx_cpustat_acc(vxi, idle, cpu, cpustat, sys_ticks);
+
if (wake_priority_sleeper(rq))
goto out;
+
+ ckrm_sched_tick(jiffies,cpu,rq_ckrm_load(rq));
+
+#ifdef CONFIG_VSERVER_HARDCPU_IDLE
+ if (!--rq->idle_tokens && !list_empty(&rq->hold_queue))
+ set_need_resched();
+#endif
rebalance_tick(cpu, rq, IDLE);
return;
}
cpustat->system += sys_ticks;
/* Task might have expired already, but not scheduled off yet */
- if (p->array != rq->active) {
+ if (p->array != rq_active(p,rq)) {
set_tsk_need_resched(p);
goto out;
}
set_tsk_need_resched(p);
/* put it at the end of the queue: */
- dequeue_task(p, rq->active);
- enqueue_task(p, rq->active);
+ dequeue_task(p, rq_active(p,rq));
+ enqueue_task(p, rq_active(p,rq));
}
goto out_unlock;
}
- if (!--p->time_slice) {
+ if (vx_need_resched(p)) {
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ /* Hubertus ... we can abstract this out */
+ ckrm_lrq_t* rq = get_task_lrq(p);
+#endif
dequeue_task(p, rq->active);
set_tsk_need_resched(p);
p->prio = effective_prio(p);
rq->expired_timestamp = jiffies;
if (!TASK_INTERACTIVE(p) || EXPIRED_STARVING(rq)) {
enqueue_task(p, rq->expired);
- if (p->static_prio < rq->best_expired_prio)
- rq->best_expired_prio = p->static_prio;
+ if (p->static_prio < this_rq()->best_expired_prio)
+ this_rq()->best_expired_prio = p->static_prio;
} else
enqueue_task(p, rq->active);
} else {
if (TASK_INTERACTIVE(p) && !((task_timeslice(p) -
p->time_slice) % TIMESLICE_GRANULARITY(p)) &&
(p->time_slice >= TIMESLICE_GRANULARITY(p)) &&
- (p->array == rq->active)) {
+ (p->array == rq_active(p,rq))) {
- dequeue_task(p, rq->active);
+ dequeue_task(p, rq_active(p,rq));
set_tsk_need_resched(p);
p->prio = effective_prio(p);
- enqueue_task(p, rq->active);
+ enqueue_task(p, rq_active(p,rq));
}
}
out_unlock:
spin_unlock(&rq->lock);
out:
+ ckrm_sched_tick(jiffies,cpu,rq_ckrm_load(rq));
rebalance_tick(cpu, rq, NOT_IDLE);
}
if (!(sd->flags & SD_SHARE_CPUPOWER))
return;
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ if (prev != rq->idle) {
+ unsigned long long run = now - prev->timestamp;
+ ckrm_lrq_t * lrq = get_task_lrq(prev);
+
+ lrq->lrq_load -= task_load(prev);
+ cpu_demand_event(&prev->demand_stat,CPU_DEMAND_DESCHEDULE,run);
+ lrq->lrq_load += task_load(prev);
+
+ cpu_demand_event(get_task_lrq_stat(prev),CPU_DEMAND_DESCHEDULE,run);
+ update_local_cvt(prev, run);
+ }
+#endif
/*
* Unlock the current runqueue because we have to lock in
* CPU order to avoid deadlocks. Caller knows that we might
*/
spin_unlock(&this_rq->lock);
- cpus_and(sibling_map, sd->span, cpu_online_map);
+ sibling_map = sd->span;
for_each_cpu_mask(i, sibling_map)
spin_lock(&cpu_rq(i)->lock);
* wake_sleeping_dependent():
*/
spin_unlock(&this_rq->lock);
- cpus_and(sibling_map, sd->span, cpu_online_map);
+ sibling_map = sd->span;
for_each_cpu_mask(i, sibling_map)
spin_lock(&cpu_rq(i)->lock);
cpu_clear(this_cpu, sibling_map);
task_t *prev, *next;
runqueue_t *rq;
prio_array_t *array;
- struct list_head *queue;
unsigned long long now;
unsigned long run_time;
- int cpu, idx;
+ int cpu;
+#ifdef CONFIG_VSERVER_HARDCPU
+ struct vx_info *vxi;
+ int maxidle = -HZ;
+#endif
+
+ /*
+ * If crash dump is in progress, this other cpu's
+ * need to wait until it completes.
+ * NB: this code is optimized away for kernels without
+ * dumping enabled.
+ */
+ if (unlikely(dump_oncpu))
+ goto dump_scheduling_disabled;
+
+ //WARN_ON(system_state == SYSTEM_BOOTING);
/*
* Test if we are atomic. Since do_exit() needs to call into
* schedule() atomically, we ignore that path for now.
* Otherwise, whine if we are scheduling when we should not be.
*/
- if (likely(!(current->state & (TASK_DEAD | TASK_ZOMBIE)))) {
+ if (likely(!(current->exit_state & (EXIT_DEAD | EXIT_ZOMBIE)))) {
if (unlikely(in_atomic())) {
printk(KERN_ERR "bad: scheduling while atomic!\n");
dump_stack();
spin_lock_irq(&rq->lock);
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ if (prev != rq->idle) {
+ unsigned long long run = now - prev->timestamp;
+ ckrm_lrq_t * lrq = get_task_lrq(prev);
+
+ lrq->lrq_load -= task_load(prev);
+ cpu_demand_event(&prev->demand_stat,CPU_DEMAND_DESCHEDULE,run);
+ lrq->lrq_load += task_load(prev);
+
+ cpu_demand_event(get_task_lrq_stat(prev),CPU_DEMAND_DESCHEDULE,run);
+ update_local_cvt(prev, run);
+ }
+#endif
+
+ if (unlikely(current->flags & PF_DEAD))
+ current->state = EXIT_DEAD;
/*
* if entering off of a kernel preemption go straight
* to picking the next task.
deactivate_task(prev, rq);
}
+#ifdef CONFIG_VSERVER_HARDCPU
+ if (!list_empty(&rq->hold_queue)) {
+ struct list_head *l, *n;
+ int ret;
+
+ vxi = NULL;
+ list_for_each_safe(l, n, &rq->hold_queue) {
+ next = list_entry(l, task_t, run_list);
+ if (vxi == next->vx_info)
+ continue;
+
+ vxi = next->vx_info;
+ ret = vx_tokens_recalc(vxi);
+ // tokens = vx_tokens_avail(next);
+
+ if (ret > 0) {
+ list_del(&next->run_list);
+ next->state &= ~TASK_ONHOLD;
+ // one less waiting
+ vx_onhold_dec(vxi);
+ array = rq->expired;
+ next->prio = MAX_PRIO-1;
+ enqueue_task(next, array);
+ rq->nr_running++;
+ if (next->static_prio < rq->best_expired_prio)
+ rq->best_expired_prio = next->static_prio;
+
+ // printk("··· %8lu unhold %p [%d]\n", jiffies, next, next->prio);
+ break;
+ }
+ if ((ret < 0) && (maxidle < ret))
+ maxidle = ret;
+ }
+ }
+ rq->idle_tokens = -maxidle;
+
+pick_next:
+#endif
+
cpu = smp_processor_id();
if (unlikely(!rq->nr_running)) {
go_idle:
goto go_idle;
}
- array = rq->active;
- if (unlikely(!array->nr_active)) {
- /*
- * Switch the active and expired arrays.
- */
- schedstat_inc(rq, sched_switch);
- rq->active = rq->expired;
- rq->expired = array;
- array = rq->active;
- rq->expired_timestamp = 0;
- rq->best_expired_prio = MAX_PRIO;
- } else
- schedstat_inc(rq, sched_noswitch);
-
- idx = sched_find_first_bit(array->bitmap);
- queue = array->queue + idx;
- next = list_entry(queue->next, task_t, run_list);
+ /* MEF: CKRM refactored code into rq_get_next_task(); make
+ * sure that when upgrading changes are reflected into both
+ * versions of the code.
+ */
+ next = rq_get_next_task(rq);
+
+#ifdef CONFIG_VSERVER_HARDCPU
+ vxi = next->vx_info;
+ if (vx_info_flags(vxi, VXF_SCHED_PAUSE|VXF_SCHED_HARD, 0)) {
+ int ret = vx_tokens_recalc(vxi);
+
+ if (unlikely(ret <= 0)) {
+ if (ret && (rq->idle_tokens > -ret))
+ rq->idle_tokens = -ret;
+ __deactivate_task(next, rq);
+ recalc_task_prio(next, now);
+ // a new one on hold
+ vx_onhold_inc(vxi);
+ next->state |= TASK_ONHOLD;
+ list_add_tail(&next->run_list, &rq->hold_queue);
+ //printk("··· %8lu hold %p [%d]\n", jiffies, next, next->prio);
+ goto pick_next;
+ }
+ }
+#endif
if (!rt_task(next) && next->activated > 0) {
unsigned long long delta = now - next->timestamp;
preempt_enable_no_resched();
if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
goto need_resched;
+
+ return;
+
+ dump_scheduling_disabled:
+ /* allow scheduling only if this is the dumping cpu */
+ if (dump_oncpu != smp_processor_id()+1) {
+ while (dump_oncpu)
+ cpu_relax();
+ }
+ return;
}
EXPORT_SYMBOL(schedule);
-
#ifdef CONFIG_PREEMPT
/*
* this is is the entry point to schedule() from in-kernel preemption
__remove_wait_queue(q, &wait); \
spin_unlock_irqrestore(&q->lock, flags);
+#define SLEEP_ON_BKLCHECK \
+ if (unlikely(!kernel_locked()) && \
+ sleep_on_bkl_warnings < 10) { \
+ sleep_on_bkl_warnings++; \
+ WARN_ON(1); \
+ }
+
+static int sleep_on_bkl_warnings;
+
void fastcall __sched interruptible_sleep_on(wait_queue_head_t *q)
{
SLEEP_ON_VAR
+ SLEEP_ON_BKLCHECK
+
current->state = TASK_INTERRUPTIBLE;
SLEEP_ON_HEAD
{
SLEEP_ON_VAR
+ SLEEP_ON_BKLCHECK
+
current->state = TASK_INTERRUPTIBLE;
SLEEP_ON_HEAD
EXPORT_SYMBOL(interruptible_sleep_on_timeout);
-void fastcall __sched sleep_on(wait_queue_head_t *q)
-{
- SLEEP_ON_VAR
-
- current->state = TASK_UNINTERRUPTIBLE;
-
- SLEEP_ON_HEAD
- schedule();
- SLEEP_ON_TAIL
-}
-
-EXPORT_SYMBOL(sleep_on);
-
long fastcall __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
{
SLEEP_ON_VAR
+ SLEEP_ON_BKLCHECK
+
current->state = TASK_UNINTERRUPTIBLE;
SLEEP_ON_HEAD
* and we have a single winner.
*/
if (increment < 0) {
+ if (vx_flags(VXF_IGNEG_NICE, 0))
+ return 0;
if (!capable(CAP_SYS_NICE))
return -EPERM;
if (increment < -40)
return TASK_NICE(p);
}
-EXPORT_SYMBOL(task_nice);
-
/**
* idle_cpu - is a given cpu idle currently?
* @cpu: the processor in question.
{
struct sched_param lp;
int retval = -EINVAL;
- int oldprio;
+ int oldprio, oldpolicy = -1;
prio_array_t *array;
unsigned long flags;
runqueue_t *rq;
retval = -ESRCH;
if (!p)
- goto out_unlock_tasklist;
-
- /*
- * To be able to change p->policy safely, the apropriate
- * runqueue lock must be held.
- */
- rq = task_rq_lock(p, &flags);
-
+ goto out_unlock;
+recheck:
+ /* double check policy once rq lock held */
if (policy < 0)
- policy = p->policy;
+ policy = oldpolicy = p->policy;
else {
retval = -EINVAL;
if (policy != SCHED_FIFO && policy != SCHED_RR &&
if (retval)
goto out_unlock;
+ /*
+ * To be able to change p->policy safely, the apropriate
+ * runqueue lock must be held.
+ */
+ rq = task_rq_lock(p, &flags);
+ /* recheck policy now with rq lock held */
+ if (unlikely(oldpolicy != -1 && oldpolicy != p->policy)) {
+ policy = oldpolicy = -1;
+ task_rq_unlock(rq, &flags);
+ goto recheck;
+ }
array = p->array;
if (array)
deactivate_task(p, task_rq(p));
oldprio = p->prio;
__setscheduler(p, policy, lp.sched_priority);
if (array) {
+ vx_activate_task(p);
__activate_task(p, task_rq(p));
/*
* Reschedule if we are currently running on this runqueue and
} else if (TASK_PREEMPTS_CURR(p, rq))
resched_task(rq->curr);
}
-
-out_unlock:
task_rq_unlock(rq, &flags);
-out_unlock_tasklist:
+out_unlock:
read_unlock_irq(&tasklist_lock);
-
out_nounlock:
return retval;
}
{
runqueue_t *rq = this_rq_lock();
prio_array_t *array = current->array;
- prio_array_t *target = rq->expired;
+ prio_array_t *target = rq_expired(current,rq);
schedstat_inc(rq, yld_cnt);
/*
* array.)
*/
if (rt_task(current))
- target = rq->active;
+ target = rq_active(current,rq);
+#warning MEF need to fix up SCHEDSTATS code, but I hope this is fixed by the 2.6.10 CKRM patch
+#ifdef CONFIG_SCHEDSTATS
if (current->array->nr_active == 1) {
schedstat_inc(rq, yld_act_empty);
if (!rq->expired->nr_active)
schedstat_inc(rq, yld_both_empty);
} else if (!rq->expired->nr_active)
schedstat_inc(rq, yld_exp_empty);
+#endif
dequeue_task(current, array);
enqueue_task(current, target);
void __sched __cond_resched(void)
{
- set_current_state(TASK_RUNNING);
- schedule();
+#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
+ __might_sleep(__FILE__, __LINE__, 0);
+#endif
+ /*
+ * The system_state check is somewhat ugly but we might be
+ * called during early boot when we are not yet ready to reschedule.
+ */
+ if (need_resched() && system_state >= SYSTEM_BOOTING_SCHEDULER_OK) {
+ set_current_state(TASK_RUNNING);
+ schedule();
+ }
+
}
EXPORT_SYMBOL(__cond_resched);
+void __sched __cond_resched_lock(spinlock_t * lock)
+{
+ if (need_resched()) {
+ _raw_spin_unlock(lock);
+ preempt_enable_no_resched();
+ set_current_state(TASK_RUNNING);
+ schedule();
+ spin_lock(lock);
+ }
+}
+
+EXPORT_SYMBOL(__cond_resched_lock);
+
+
/**
* yield - yield the current processor to other threads.
*
idle->state = TASK_RUNNING;
set_task_cpu(idle, cpu);
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ cpu_demand_event(&(idle->demand_stat),CPU_DEMAND_INIT,0);
+ idle->cpu_class = get_default_cpu_class();
+ idle->array = NULL;
+#endif
+
spin_lock_irqsave(&rq->lock, flags);
rq->curr = rq->idle = idle;
set_tsk_need_resched(idle);
if (!cpu_isset(dest_cpu, p->cpus_allowed))
goto out;
- set_task_cpu(p, dest_cpu);
if (p->array) {
/*
* Sync timestamp with rq_dest's before activating.
p->timestamp = p->timestamp - rq_src->timestamp_last_tick
+ rq_dest->timestamp_last_tick;
deactivate_task(p, rq_src);
+ set_task_cpu(p, dest_cpu);
activate_task(p, rq_dest, 0);
if (TASK_PREEMPTS_CURR(p, rq_dest))
resched_task(rq_dest->curr);
- }
+ } else
+ set_task_cpu(p, dest_cpu);
out:
double_rq_unlock(rq_src, rq_dest);
struct runqueue *rq = cpu_rq(dead_cpu);
/* Must be exiting, otherwise would be on tasklist. */
- BUG_ON(tsk->state != TASK_ZOMBIE && tsk->state != TASK_DEAD);
+ BUG_ON(tsk->exit_state != EXIT_ZOMBIE && tsk->exit_state != EXIT_DEAD);
/* Cannot have done final schedule yet: would have vanished. */
BUG_ON(tsk->flags & PF_DEAD);
EXPORT_SYMBOL(kernel_flag);
#ifdef CONFIG_SMP
-/* Attach the domain 'sd' to 'cpu' as its base domain */
+/*
+ * Attach the domain 'sd' to 'cpu' as its base domain. Callers must
+ * hold the hotplug lock.
+ */
static void cpu_attach_domain(struct sched_domain *sd, int cpu)
{
migration_req_t req;
runqueue_t *rq = cpu_rq(cpu);
int local = 1;
- lock_cpu_hotplug();
-
spin_lock_irqsave(&rq->lock, flags);
if (cpu == smp_processor_id() || !cpu_online(cpu)) {
wake_up_process(rq->migration_thread);
wait_for_completion(&req.done);
}
-
- unlock_cpu_hotplug();
}
/*
* in arch code. That defines the number of nearby nodes in a node's top
* level scheduling domain.
*/
-#if defined(CONFIG_NUMA) && defined(SD_NODES_PER_DOMAIN)
+#ifdef CONFIG_NUMA
+#ifdef SD_NODES_PER_DOMAIN
/**
* find_next_best_node - find the next node to include in a sched_domain
* @node: node whose sched_domain we're building
*
* Should use nodemask_t.
*/
-static int __init find_next_best_node(int node, unsigned long *used_nodes)
+static int __devinit find_next_best_node(int node, unsigned long *used_nodes)
{
int i, n, val, min_val, best_node = 0;
* should be one that prevents unnecessary balancing, but also spreads tasks
* out optimally.
*/
-cpumask_t __init sched_domain_node_span(int node)
+static cpumask_t __devinit sched_domain_node_span(int node)
{
int i;
cpumask_t span;
return span;
}
-#else /* CONFIG_NUMA && SD_NODES_PER_DOMAIN */
-cpumask_t __init sched_domain_node_span(int node)
+#else /* SD_NODES_PER_DOMAIN */
+static cpumask_t __devinit sched_domain_node_span(int node)
{
return cpu_possible_map;
}
-#endif /* CONFIG_NUMA && SD_NODES_PER_DOMAIN */
+#endif /* SD_NODES_PER_DOMAIN */
+#endif /* CONFIG_NUMA */
#ifdef CONFIG_SCHED_SMT
static DEFINE_PER_CPU(struct sched_domain, cpu_domains);
static struct sched_group sched_group_cpus[NR_CPUS];
-__init static int cpu_to_cpu_group(int cpu)
+static int __devinit cpu_to_cpu_group(int cpu)
{
return cpu;
}
static DEFINE_PER_CPU(struct sched_domain, phys_domains);
static struct sched_group sched_group_phys[NR_CPUS];
-__init static int cpu_to_phys_group(int cpu)
+static int __devinit cpu_to_phys_group(int cpu)
{
#ifdef CONFIG_SCHED_SMT
return first_cpu(cpu_sibling_map[cpu]);
static DEFINE_PER_CPU(struct sched_domain, node_domains);
static struct sched_group sched_group_nodes[MAX_NUMNODES];
-__init static int cpu_to_node_group(int cpu)
+static int __devinit cpu_to_node_group(int cpu)
{
return cpu_to_node(cpu);
}
static struct sched_group sched_group_isolated[NR_CPUS];
/* cpus with isolated domains */
-cpumask_t __initdata cpu_isolated_map = CPU_MASK_NONE;
+cpumask_t __devinitdata cpu_isolated_map = CPU_MASK_NONE;
-__init static int cpu_to_isolated_group(int cpu)
+static int __devinit cpu_to_isolated_group(int cpu)
{
return cpu;
}
* covered by the given span, and will set each group's ->cpumask correctly,
* and ->cpu_power to 0.
*/
-__init static void init_sched_build_groups(struct sched_group groups[],
+static void __devinit init_sched_build_groups(struct sched_group groups[],
cpumask_t span, int (*group_fn)(int cpu))
{
struct sched_group *first = NULL, *last = NULL;
last->next = first;
}
-__init static void arch_init_sched_domains(void)
+/*
+ * Set up scheduler domains and groups. Callers must hold the hotplug lock.
+ */
+static void __devinit arch_init_sched_domains(void)
{
int i;
cpumask_t cpu_default_map;
+ cpumask_t cpu_isolated_online_map;
+
+ cpus_and(cpu_isolated_online_map, cpu_isolated_map, cpu_online_map);
/*
* Setup mask for cpus without special case scheduling requirements.
* exclude other special cases in the future.
*/
cpus_complement(cpu_default_map, cpu_isolated_map);
- cpus_and(cpu_default_map, cpu_default_map, cpu_possible_map);
+ cpus_and(cpu_default_map, cpu_default_map, cpu_online_map);
/* Set up domains */
- for_each_cpu(i) {
+ for_each_online_cpu(i) {
int group;
struct sched_domain *sd = NULL, *p;
cpumask_t nodemask = node_to_cpumask(cpu_to_node(i));
* Unlike those of other cpus, the domains and groups are
* single level, and span a single cpu.
*/
- if (cpu_isset(i, cpu_isolated_map)) {
+ if (cpu_isset(i, cpu_isolated_online_map)) {
#ifdef CONFIG_SCHED_SMT
sd = &per_cpu(cpu_domains, i);
#else
sd = &per_cpu(phys_domains, i);
group = cpu_to_phys_group(i);
*sd = SD_CPU_INIT;
-#ifdef CONFIG_NUMA
sd->span = nodemask;
-#else
- sd->span = cpu_possible_map;
-#endif
sd->parent = p;
sd->groups = &sched_group_phys[group];
#ifdef CONFIG_SCHED_SMT
/* Set up CPU (sibling) groups */
- for_each_cpu(i) {
+ for_each_online_cpu(i) {
cpumask_t this_sibling_map = cpu_sibling_map[i];
cpus_and(this_sibling_map, this_sibling_map, cpu_default_map);
if (i != first_cpu(this_sibling_map))
#endif
/* Set up isolated groups */
- for_each_cpu_mask(i, cpu_isolated_map) {
- cpumask_t mask;
- cpus_clear(mask);
- cpu_set(i, mask);
+ for_each_cpu_mask(i, cpu_isolated_online_map) {
+ cpumask_t mask = cpumask_of_cpu(i);
init_sched_build_groups(sched_group_isolated, mask,
&cpu_to_isolated_group);
}
-#ifdef CONFIG_NUMA
/* Set up physical groups */
for (i = 0; i < MAX_NUMNODES; i++) {
cpumask_t nodemask = node_to_cpumask(i);
init_sched_build_groups(sched_group_phys, nodemask,
&cpu_to_phys_group);
}
-#else
- init_sched_build_groups(sched_group_phys, cpu_possible_map,
- &cpu_to_phys_group);
-#endif
+
#ifdef CONFIG_NUMA
/* Set up node groups */
&cpu_to_node_group);
#endif
+
/* Calculate CPU power for physical packages and nodes */
for_each_cpu_mask(i, cpu_default_map) {
int power;
(cpus_weight(sd->groups->cpumask)-1) / 10;
sd->groups->cpu_power = power;
+
#ifdef CONFIG_NUMA
if (i == first_cpu(sd->groups->cpumask)) {
/* Only add "power" once for each physical package. */
}
/* Attach the domains */
- for_each_cpu(i) {
+ for_each_online_cpu(i) {
struct sched_domain *sd;
#ifdef CONFIG_SCHED_SMT
sd = &per_cpu(cpu_domains, i);
#endif
cpu_attach_domain(sd, i);
}
+ last->next = first;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void __devinit arch_destroy_sched_domains(void)
+{
+ /* Do nothing: everything is statically allocated. */
}
+#endif
#undef SCHED_DOMAIN_DEBUG
#ifdef SCHED_DOMAIN_DEBUG
{
int i;
- for_each_cpu(i) {
+ for_each_online_cpu(i) {
runqueue_t *rq = cpu_rq(i);
struct sched_domain *sd;
int level = 0;
sd = rq->sd;
- printk(KERN_DEBUG "CPU%d: %s\n",
- i, (cpu_online(i) ? " online" : "offline"));
+ printk(KERN_DEBUG "CPU%d:\n", i);
do {
int j;
#define sched_domain_debug() {}
#endif
+#ifdef CONFIG_SMP
+/* Initial dummy domain for early boot and for hotplug cpu */
+static __devinitdata struct sched_domain sched_domain_dummy;
+static __devinitdata struct sched_group sched_group_dummy;
+#endif
+
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * Force a reinitialization of the sched domains hierarchy. The domains
+ * and groups cannot be updated in place without racing with the balancing
+ * code, so we temporarily attach all running cpus to a "dummy" domain
+ * which will prevent rebalancing while the sched domains are recalculated.
+ */
+static int update_sched_domains(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ int i;
+
+ switch (action) {
+ case CPU_UP_PREPARE:
+ case CPU_DOWN_PREPARE:
+ for_each_online_cpu(i)
+ cpu_attach_domain(&sched_domain_dummy, i);
+ arch_destroy_sched_domains();
+ return NOTIFY_OK;
+
+ case CPU_UP_CANCELED:
+ case CPU_DOWN_FAILED:
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ /*
+ * Fall through and re-initialise the domains.
+ */
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ /* The hotplug lock is already held by cpu_up/cpu_down */
+ arch_init_sched_domains();
+
+ sched_domain_debug();
+
+ return NOTIFY_OK;
+}
+#endif
+
void __init sched_init_smp(void)
{
+ lock_cpu_hotplug();
arch_init_sched_domains();
sched_domain_debug();
+ unlock_cpu_hotplug();
+ /* XXX: Theoretical race here - CPU may be hotplugged now */
+ hotcpu_notifier(update_sched_domains, 0);
}
#else
void __init sched_init_smp(void)
void __init sched_init(void)
{
runqueue_t *rq;
- int i, j, k;
+ int i;
#ifdef CONFIG_SMP
/* Set up an initial dummy domain for early boot */
- static struct sched_domain sched_domain_init;
- static struct sched_group sched_group_init;
-
- memset(&sched_domain_init, 0, sizeof(struct sched_domain));
- sched_domain_init.span = CPU_MASK_ALL;
- sched_domain_init.groups = &sched_group_init;
- sched_domain_init.last_balance = jiffies;
- sched_domain_init.balance_interval = INT_MAX; /* Don't balance */
- sched_domain_init.busy_factor = 1;
-
- memset(&sched_group_init, 0, sizeof(struct sched_group));
- sched_group_init.cpumask = CPU_MASK_ALL;
- sched_group_init.next = &sched_group_init;
- sched_group_init.cpu_power = SCHED_LOAD_SCALE;
+
+ memset(&sched_domain_dummy, 0, sizeof(struct sched_domain));
+ sched_domain_dummy.span = CPU_MASK_ALL;
+ sched_domain_dummy.groups = &sched_group_dummy;
+ sched_domain_dummy.last_balance = jiffies;
+ sched_domain_dummy.balance_interval = INT_MAX; /* Don't balance */
+ sched_domain_dummy.busy_factor = 1;
+
+ memset(&sched_group_dummy, 0, sizeof(struct sched_group));
+ sched_group_dummy.cpumask = CPU_MASK_ALL;
+ sched_group_dummy.next = &sched_group_dummy;
+ sched_group_dummy.cpu_power = SCHED_LOAD_SCALE;
#endif
+ init_cpu_classes();
+
for (i = 0; i < NR_CPUS; i++) {
+#ifndef CONFIG_CKRM_CPU_SCHEDULE
+ int j, k;
prio_array_t *array;
rq = cpu_rq(i);
spin_lock_init(&rq->lock);
+
+ for (j = 0; j < 2; j++) {
+ array = rq->arrays + j;
+ for (k = 0; k < MAX_PRIO; k++) {
+ INIT_LIST_HEAD(array->queue + k);
+ __clear_bit(k, array->bitmap);
+ }
+ // delimiter for bitsearch
+ __set_bit(MAX_PRIO, array->bitmap);
+ }
+
rq->active = rq->arrays;
rq->expired = rq->arrays + 1;
rq->best_expired_prio = MAX_PRIO;
+#else
+ rq = cpu_rq(i);
+ spin_lock_init(&rq->lock);
+#endif
+
#ifdef CONFIG_SMP
- rq->sd = &sched_domain_init;
+ rq->sd = &sched_domain_dummy;
rq->cpu_load = 0;
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+ ckrm_load_init(rq_ckrm_load(rq));
+#endif
rq->active_balance = 0;
rq->push_cpu = 0;
rq->migration_thread = NULL;
INIT_LIST_HEAD(&rq->migration_queue);
+#endif
+#ifdef CONFIG_VSERVER_HARDCPU
+ INIT_LIST_HEAD(&rq->hold_queue);
#endif
atomic_set(&rq->nr_iowait, 0);
- for (j = 0; j < 2; j++) {
- array = rq->arrays + j;
- for (k = 0; k < MAX_PRIO; k++) {
- INIT_LIST_HEAD(array->queue + k);
- __clear_bit(k, array->bitmap);
- }
- // delimiter for bitsearch
- __set_bit(MAX_PRIO, array->bitmap);
- }
}
/*
}
#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
-void __might_sleep(char *file, int line)
+void __might_sleep(char *file, int line, int atomic_depth)
{
#if defined(in_atomic)
static unsigned long prev_jiffy; /* ratelimiting */
- if ((in_atomic() || irqs_disabled()) &&
+#ifndef CONFIG_PREEMPT
+ atomic_depth = 0;
+#endif
+ if (((in_atomic() != atomic_depth) || irqs_disabled()) &&
system_state == SYSTEM_RUNNING) {
if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
return;
prev_jiffy = jiffies;
printk(KERN_ERR "Debug: sleeping function called from invalid"
" context at %s:%d\n", file, line);
- printk("in_atomic():%d, irqs_disabled():%d\n",
- in_atomic(), irqs_disabled());
+ printk("in_atomic():%d[expected: %d], irqs_disabled():%d\n",
+ in_atomic(), atomic_depth, irqs_disabled());
dump_stack();
}
#endif
}
EXPORT_SYMBOL(__might_sleep);
#endif
+
+#ifdef CONFIG_CKRM_CPU_SCHEDULE
+/**
+ * return the classqueue object of a certain processor
+ */
+struct classqueue_struct * get_cpu_classqueue(int cpu)
+{
+ return (& (cpu_rq(cpu)->classqueue) );
+}
+
+/**
+ * _ckrm_cpu_change_class - change the class of a task
+ */
+void _ckrm_cpu_change_class(task_t *tsk, struct ckrm_cpu_class *newcls)
+{
+ prio_array_t *array;
+ struct runqueue *rq;
+ unsigned long flags;
+
+ rq = task_rq_lock(tsk,&flags);
+ array = tsk->array;
+ if (array) {
+ dequeue_task(tsk,array);
+ tsk->cpu_class = newcls;
+ enqueue_task(tsk,rq_active(tsk,rq));
+ } else
+ tsk->cpu_class = newcls;
+
+ task_rq_unlock(rq,&flags);
+}
+#endif
git://git.onelab.eu / linux-2.6.git / blobdiff