[PATCH] sched: clean up fallout of recent changes
Clean up some of the impact of recent (and not so recent) scheduler changes: - turning macros into nice inline functions - sanitizing and unifying variable definitions - whitespace, style consistency, 80-lines, comment correctness, spelling and curly braces police Due to the macro hell and variable placement simplifications there's even 26 bytes of .text saved: text data bss dec hex filename 25510 4153 192 29855 749f sched.o.before 25484 4153 192 29829 7485 sched.o.after [akpm@osdl.org: build fix] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar
Linus Torvalds
parent
829035fd70
commit
48f24c4da1
1 changed files with 195 additions and 167 deletions
362
kernel/sched.c
362
kernel/sched.c
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@ -184,9 +184,6 @@ static inline unsigned int task_timeslice(task_t *p)
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return static_prio_timeslice(p->static_prio);
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}
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#define task_hot(p, now, sd) ((long long) ((now) - (p)->last_ran) \
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< (long long) (sd)->cache_hot_time)
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/*
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* These are the runqueue data structures:
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*/
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@ -278,8 +275,8 @@ static DEFINE_PER_CPU(struct runqueue, runqueues);
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* The domain tree of any CPU may only be accessed from within
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* preempt-disabled sections.
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*/
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#define for_each_domain(cpu, domain) \
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for (domain = rcu_dereference(cpu_rq(cpu)->sd); domain; domain = domain->parent)
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#define for_each_domain(cpu, __sd) \
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for (__sd = rcu_dereference(cpu_rq(cpu)->sd); __sd; __sd = __sd->parent)
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#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
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#define this_rq() (&__get_cpu_var(runqueues))
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@ -1039,6 +1036,7 @@ static int migrate_task(task_t *p, int dest_cpu, migration_req_t *req)
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req->task = p;
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req->dest_cpu = dest_cpu;
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list_add(&req->list, &rq->migration_queue);
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return 1;
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}
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@ -1135,7 +1133,7 @@ static inline unsigned long cpu_avg_load_per_task(int cpu)
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runqueue_t *rq = cpu_rq(cpu);
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unsigned long n = rq->nr_running;
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return n ? rq->raw_weighted_load / n : SCHED_LOAD_SCALE;
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return n ? rq->raw_weighted_load / n : SCHED_LOAD_SCALE;
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}
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/*
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@ -1494,7 +1492,6 @@ int fastcall wake_up_process(task_t *p)
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return try_to_wake_up(p, TASK_STOPPED | TASK_TRACED |
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TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE, 0);
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}
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EXPORT_SYMBOL(wake_up_process);
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int fastcall wake_up_state(task_t *p, unsigned int state)
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@ -1866,6 +1863,15 @@ unsigned long nr_active(void)
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#ifdef CONFIG_SMP
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/*
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* Is this task likely cache-hot:
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*/
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static inline int
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task_hot(struct task_struct *p, unsigned long long now, struct sched_domain *sd)
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{
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return (long long)(now - p->last_ran) < (long long)sd->cache_hot_time;
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}
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/*
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* double_rq_lock - safely lock two runqueues
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*
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@ -2029,6 +2035,7 @@ int can_migrate_task(task_t *p, runqueue_t *rq, int this_cpu,
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}
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#define rq_best_prio(rq) min((rq)->curr->prio, (rq)->best_expired_prio)
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/*
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* move_tasks tries to move up to max_nr_move tasks and max_load_move weighted
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* load from busiest to this_rq, as part of a balancing operation within
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@ -2041,11 +2048,10 @@ static int move_tasks(runqueue_t *this_rq, int this_cpu, runqueue_t *busiest,
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struct sched_domain *sd, enum idle_type idle,
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int *all_pinned)
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{
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int idx, pulled = 0, pinned = 0, this_best_prio, best_prio,
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best_prio_seen, skip_for_load;
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prio_array_t *array, *dst_array;
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struct list_head *head, *curr;
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int idx, pulled = 0, pinned = 0, this_best_prio, busiest_best_prio;
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int busiest_best_prio_seen;
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int skip_for_load; /* skip the task based on weighted load issues */
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long rem_load_move;
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task_t *tmp;
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@ -2055,15 +2061,15 @@ static int move_tasks(runqueue_t *this_rq, int this_cpu, runqueue_t *busiest,
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rem_load_move = max_load_move;
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pinned = 1;
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this_best_prio = rq_best_prio(this_rq);
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busiest_best_prio = rq_best_prio(busiest);
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best_prio = rq_best_prio(busiest);
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/*
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* Enable handling of the case where there is more than one task
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* with the best priority. If the current running task is one
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* of those with prio==busiest_best_prio we know it won't be moved
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* of those with prio==best_prio we know it won't be moved
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* and therefore it's safe to override the skip (based on load) of
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* any task we find with that prio.
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*/
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busiest_best_prio_seen = busiest_best_prio == busiest->curr->prio;
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best_prio_seen = best_prio == busiest->curr->prio;
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/*
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* We first consider expired tasks. Those will likely not be
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@ -2110,10 +2116,11 @@ static int move_tasks(runqueue_t *this_rq, int this_cpu, runqueue_t *busiest,
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*/
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skip_for_load = tmp->load_weight > rem_load_move;
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if (skip_for_load && idx < this_best_prio)
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skip_for_load = !busiest_best_prio_seen && idx == busiest_best_prio;
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skip_for_load = !best_prio_seen && idx == best_prio;
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if (skip_for_load ||
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!can_migrate_task(tmp, busiest, this_cpu, sd, idle, &pinned)) {
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busiest_best_prio_seen |= idx == busiest_best_prio;
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best_prio_seen |= idx == best_prio;
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if (curr != head)
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goto skip_queue;
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idx++;
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@ -2156,8 +2163,8 @@ static int move_tasks(runqueue_t *this_rq, int this_cpu, runqueue_t *busiest,
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/*
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* find_busiest_group finds and returns the busiest CPU group within the
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* domain. It calculates and returns the amount of weighted load which should be
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* moved to restore balance via the imbalance parameter.
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* domain. It calculates and returns the amount of weighted load which
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* should be moved to restore balance via the imbalance parameter.
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*/
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static struct sched_group *
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find_busiest_group(struct sched_domain *sd, int this_cpu,
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@ -2279,7 +2286,7 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
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* capacity but still has some space to pick up some load
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* from other group and save more power
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*/
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if (sum_nr_running <= group_capacity - 1)
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if (sum_nr_running <= group_capacity - 1) {
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if (sum_nr_running > leader_nr_running ||
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(sum_nr_running == leader_nr_running &&
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first_cpu(group->cpumask) >
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@ -2287,7 +2294,7 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
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group_leader = group;
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leader_nr_running = sum_nr_running;
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}
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}
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group_next:
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#endif
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group = group->next;
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@ -2342,8 +2349,7 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
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* moved
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*/
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if (*imbalance < busiest_load_per_task) {
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unsigned long pwr_now, pwr_move;
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unsigned long tmp;
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unsigned long tmp, pwr_now, pwr_move;
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unsigned int imbn;
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small_imbalance:
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@ -2415,22 +2421,23 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
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/*
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* find_busiest_queue - find the busiest runqueue among the cpus in group.
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*/
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static runqueue_t *find_busiest_queue(struct sched_group *group,
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enum idle_type idle, unsigned long imbalance)
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static runqueue_t *
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find_busiest_queue(struct sched_group *group, enum idle_type idle,
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unsigned long imbalance)
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{
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runqueue_t *busiest = NULL, *rq;
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unsigned long max_load = 0;
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runqueue_t *busiest = NULL, *rqi;
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int i;
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for_each_cpu_mask(i, group->cpumask) {
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rqi = cpu_rq(i);
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rq = cpu_rq(i);
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if (rqi->nr_running == 1 && rqi->raw_weighted_load > imbalance)
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if (rq->nr_running == 1 && rq->raw_weighted_load > imbalance)
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continue;
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if (rqi->raw_weighted_load > max_load) {
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max_load = rqi->raw_weighted_load;
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busiest = rqi;
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if (rq->raw_weighted_load > max_load) {
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max_load = rq->raw_weighted_load;
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busiest = rq;
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}
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}
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@ -2443,7 +2450,11 @@ static runqueue_t *find_busiest_queue(struct sched_group *group,
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*/
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#define MAX_PINNED_INTERVAL 512
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#define minus_1_or_zero(n) ((n) > 0 ? (n) - 1 : 0)
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static inline unsigned long minus_1_or_zero(unsigned long n)
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{
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return n > 0 ? n - 1 : 0;
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}
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/*
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* Check this_cpu to ensure it is balanced within domain. Attempt to move
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* tasks if there is an imbalance.
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@ -2453,12 +2464,10 @@ static runqueue_t *find_busiest_queue(struct sched_group *group,
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static int load_balance(int this_cpu, runqueue_t *this_rq,
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struct sched_domain *sd, enum idle_type idle)
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{
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int nr_moved, all_pinned = 0, active_balance = 0, sd_idle = 0;
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struct sched_group *group;
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runqueue_t *busiest;
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unsigned long imbalance;
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int nr_moved, all_pinned = 0;
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int active_balance = 0;
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int sd_idle = 0;
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runqueue_t *busiest;
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if (idle != NOT_IDLE && sd->flags & SD_SHARE_CPUPOWER &&
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!sched_smt_power_savings)
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@ -2492,8 +2501,8 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
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*/
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double_rq_lock(this_rq, busiest);
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nr_moved = move_tasks(this_rq, this_cpu, busiest,
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minus_1_or_zero(busiest->nr_running),
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imbalance, sd, idle, &all_pinned);
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minus_1_or_zero(busiest->nr_running),
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imbalance, sd, idle, &all_pinned);
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double_rq_unlock(this_rq, busiest);
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/* All tasks on this runqueue were pinned by CPU affinity */
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@ -2566,7 +2575,8 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
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(sd->balance_interval < sd->max_interval))
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sd->balance_interval *= 2;
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if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER && !sched_smt_power_savings)
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if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
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!sched_smt_power_savings)
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return -1;
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return 0;
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}
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@ -2578,8 +2588,8 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
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* Called from schedule when this_rq is about to become idle (NEWLY_IDLE).
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* this_rq is locked.
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*/
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static int load_balance_newidle(int this_cpu, runqueue_t *this_rq,
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struct sched_domain *sd)
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static int
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load_balance_newidle(int this_cpu, runqueue_t *this_rq, struct sched_domain *sd)
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{
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struct sched_group *group;
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runqueue_t *busiest = NULL;
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@ -2628,9 +2638,11 @@ static int load_balance_newidle(int this_cpu, runqueue_t *this_rq,
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out_balanced:
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schedstat_inc(sd, lb_balanced[NEWLY_IDLE]);
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if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER && !sched_smt_power_savings)
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if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
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!sched_smt_power_savings)
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return -1;
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sd->nr_balance_failed = 0;
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return 0;
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}
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@ -2644,10 +2656,9 @@ static void idle_balance(int this_cpu, runqueue_t *this_rq)
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for_each_domain(this_cpu, sd) {
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if (sd->flags & SD_BALANCE_NEWIDLE) {
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if (load_balance_newidle(this_cpu, this_rq, sd)) {
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/* We've pulled tasks over so stop searching */
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/* If we've pulled tasks over stop searching: */
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if (load_balance_newidle(this_cpu, this_rq, sd))
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break;
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}
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}
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}
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}
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@ -2666,8 +2677,8 @@ static void active_load_balance(runqueue_t *busiest_rq, int busiest_cpu)
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runqueue_t *target_rq;
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int target_cpu = busiest_rq->push_cpu;
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/* Is there any task to move? */
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if (busiest_rq->nr_running <= 1)
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/* no task to move */
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return;
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target_rq = cpu_rq(target_cpu);
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@ -2685,21 +2696,20 @@ static void active_load_balance(runqueue_t *busiest_rq, int busiest_cpu)
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/* Search for an sd spanning us and the target CPU. */
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for_each_domain(target_cpu, sd) {
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if ((sd->flags & SD_LOAD_BALANCE) &&
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cpu_isset(busiest_cpu, sd->span))
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cpu_isset(busiest_cpu, sd->span))
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break;
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}
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if (unlikely(sd == NULL))
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goto out;
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if (likely(sd)) {
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schedstat_inc(sd, alb_cnt);
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schedstat_inc(sd, alb_cnt);
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if (move_tasks(target_rq, target_cpu, busiest_rq, 1,
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RTPRIO_TO_LOAD_WEIGHT(100), sd, SCHED_IDLE, NULL))
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schedstat_inc(sd, alb_pushed);
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else
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schedstat_inc(sd, alb_failed);
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out:
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if (move_tasks(target_rq, target_cpu, busiest_rq, 1,
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RTPRIO_TO_LOAD_WEIGHT(100), sd, SCHED_IDLE,
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NULL))
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schedstat_inc(sd, alb_pushed);
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else
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schedstat_inc(sd, alb_failed);
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}
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spin_unlock(&target_rq->lock);
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}
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@ -2712,23 +2722,27 @@ static void active_load_balance(runqueue_t *busiest_rq, int busiest_cpu)
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* Balancing parameters are set up in arch_init_sched_domains.
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*/
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/* Don't have all balancing operations going off at once */
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#define CPU_OFFSET(cpu) (HZ * cpu / NR_CPUS)
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static void rebalance_tick(int this_cpu, runqueue_t *this_rq,
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enum idle_type idle)
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/* Don't have all balancing operations going off at once: */
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static inline unsigned long cpu_offset(int cpu)
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{
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unsigned long old_load, this_load;
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unsigned long j = jiffies + CPU_OFFSET(this_cpu);
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return jiffies + cpu * HZ / NR_CPUS;
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}
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static void
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rebalance_tick(int this_cpu, runqueue_t *this_rq, enum idle_type idle)
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{
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unsigned long this_load, interval, j = cpu_offset(this_cpu);
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struct sched_domain *sd;
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int i;
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int i, scale;
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this_load = this_rq->raw_weighted_load;
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/* Update our load */
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for (i = 0; i < 3; i++) {
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unsigned long new_load = this_load;
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int scale = 1 << i;
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/* Update our load: */
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for (i = 0, scale = 1; i < 3; i++, scale <<= 1) {
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unsigned long old_load, new_load;
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old_load = this_rq->cpu_load[i];
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new_load = this_load;
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/*
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* Round up the averaging division if load is increasing. This
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* prevents us from getting stuck on 9 if the load is 10, for
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@ -2740,8 +2754,6 @@ static void rebalance_tick(int this_cpu, runqueue_t *this_rq,
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}
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for_each_domain(this_cpu, sd) {
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unsigned long interval;
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if (!(sd->flags & SD_LOAD_BALANCE))
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continue;
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@ -2782,6 +2794,7 @@ static inline void idle_balance(int cpu, runqueue_t *rq)
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static inline int wake_priority_sleeper(runqueue_t *rq)
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{
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int ret = 0;
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#ifdef CONFIG_SCHED_SMT
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spin_lock(&rq->lock);
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/*
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@ -2805,25 +2818,26 @@ EXPORT_PER_CPU_SYMBOL(kstat);
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* This is called on clock ticks and on context switches.
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* Bank in p->sched_time the ns elapsed since the last tick or switch.
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*/
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static inline void update_cpu_clock(task_t *p, runqueue_t *rq,
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unsigned long long now)
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static inline void
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update_cpu_clock(task_t *p, runqueue_t *rq, unsigned long long now)
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{
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unsigned long long last = max(p->timestamp, rq->timestamp_last_tick);
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p->sched_time += now - last;
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p->sched_time += now - max(p->timestamp, rq->timestamp_last_tick);
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}
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/*
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* Return current->sched_time plus any more ns on the sched_clock
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* that have not yet been banked.
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*/
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unsigned long long current_sched_time(const task_t *tsk)
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unsigned long long current_sched_time(const task_t *p)
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{
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unsigned long long ns;
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unsigned long flags;
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local_irq_save(flags);
|
||||
ns = max(tsk->timestamp, task_rq(tsk)->timestamp_last_tick);
|
||||
ns = tsk->sched_time + (sched_clock() - ns);
|
||||
ns = max(p->timestamp, task_rq(p)->timestamp_last_tick);
|
||||
ns = p->sched_time + sched_clock() - ns;
|
||||
local_irq_restore(flags);
|
||||
|
||||
return ns;
|
||||
}
|
||||
|
||||
|
|
@ -2837,11 +2851,16 @@ unsigned long long current_sched_time(const task_t *tsk)
|
|||
* increasing number of running tasks. We also ignore the interactivity
|
||||
* if a better static_prio task has expired:
|
||||
*/
|
||||
#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))
|
||||
static inline int expired_starving(runqueue_t *rq)
|
||||
{
|
||||
if (rq->curr->static_prio > rq->best_expired_prio)
|
||||
return 1;
|
||||
if (!STARVATION_LIMIT || !rq->expired_timestamp)
|
||||
return 0;
|
||||
if (jiffies - rq->expired_timestamp > STARVATION_LIMIT * rq->nr_running)
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Account user cpu time to a process.
|
||||
|
|
@ -2925,10 +2944,10 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
|
|||
*/
|
||||
void scheduler_tick(void)
|
||||
{
|
||||
unsigned long long now = sched_clock();
|
||||
int cpu = smp_processor_id();
|
||||
runqueue_t *rq = this_rq();
|
||||
task_t *p = current;
|
||||
unsigned long long now = sched_clock();
|
||||
|
||||
update_cpu_clock(p, rq, now);
|
||||
|
||||
|
|
@ -2978,7 +2997,7 @@ void scheduler_tick(void)
|
|||
|
||||
if (!rq->expired_timestamp)
|
||||
rq->expired_timestamp = jiffies;
|
||||
if (!TASK_INTERACTIVE(p) || EXPIRED_STARVING(rq)) {
|
||||
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;
|
||||
|
|
@ -3137,9 +3156,8 @@ static int dependent_sleeper(int this_cpu, runqueue_t *this_rq, task_t *p)
|
|||
static inline void wake_sleeping_dependent(int this_cpu)
|
||||
{
|
||||
}
|
||||
|
||||
static inline int dependent_sleeper(int this_cpu, runqueue_t *this_rq,
|
||||
task_t *p)
|
||||
static inline int
|
||||
dependent_sleeper(int this_cpu, runqueue_t *this_rq, task_t *p)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -3193,14 +3211,14 @@ static inline int interactive_sleep(enum sleep_type sleep_type)
|
|||
*/
|
||||
asmlinkage void __sched schedule(void)
|
||||
{
|
||||
long *switch_count;
|
||||
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, new_prio;
|
||||
task_t *prev, *next;
|
||||
prio_array_t *array;
|
||||
long *switch_count;
|
||||
runqueue_t *rq;
|
||||
|
||||
/*
|
||||
* Test if we are atomic. Since do_exit() needs to call into
|
||||
|
|
@ -3353,7 +3371,6 @@ asmlinkage void __sched schedule(void)
|
|||
if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
|
||||
goto need_resched;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(schedule);
|
||||
|
||||
#ifdef CONFIG_PREEMPT
|
||||
|
|
@ -3398,7 +3415,6 @@ asmlinkage void __sched preempt_schedule(void)
|
|||
if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
|
||||
goto need_resched;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(preempt_schedule);
|
||||
|
||||
/*
|
||||
|
|
@ -3447,10 +3463,8 @@ asmlinkage void __sched preempt_schedule_irq(void)
|
|||
int default_wake_function(wait_queue_t *curr, unsigned mode, int sync,
|
||||
void *key)
|
||||
{
|
||||
task_t *p = curr->private;
|
||||
return try_to_wake_up(p, mode, sync);
|
||||
return try_to_wake_up(curr->private, mode, sync);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(default_wake_function);
|
||||
|
||||
/*
|
||||
|
|
@ -3468,13 +3482,11 @@ static void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
|
|||
struct list_head *tmp, *next;
|
||||
|
||||
list_for_each_safe(tmp, next, &q->task_list) {
|
||||
wait_queue_t *curr;
|
||||
unsigned flags;
|
||||
curr = list_entry(tmp, wait_queue_t, task_list);
|
||||
flags = curr->flags;
|
||||
wait_queue_t *curr = list_entry(tmp, wait_queue_t, task_list);
|
||||
unsigned flags = curr->flags;
|
||||
|
||||
if (curr->func(curr, mode, sync, key) &&
|
||||
(flags & WQ_FLAG_EXCLUSIVE) &&
|
||||
!--nr_exclusive)
|
||||
(flags & WQ_FLAG_EXCLUSIVE) && !--nr_exclusive)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
@ -3495,7 +3507,6 @@ void fastcall __wake_up(wait_queue_head_t *q, unsigned int mode,
|
|||
__wake_up_common(q, mode, nr_exclusive, 0, key);
|
||||
spin_unlock_irqrestore(&q->lock, flags);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(__wake_up);
|
||||
|
||||
/*
|
||||
|
|
@ -3564,6 +3575,7 @@ EXPORT_SYMBOL(complete_all);
|
|||
void fastcall __sched wait_for_completion(struct completion *x)
|
||||
{
|
||||
might_sleep();
|
||||
|
||||
spin_lock_irq(&x->wait.lock);
|
||||
if (!x->done) {
|
||||
DECLARE_WAITQUEUE(wait, current);
|
||||
|
|
@ -3708,7 +3720,6 @@ void fastcall __sched interruptible_sleep_on(wait_queue_head_t *q)
|
|||
schedule();
|
||||
SLEEP_ON_TAIL
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(interruptible_sleep_on);
|
||||
|
||||
long fastcall __sched
|
||||
|
|
@ -3724,7 +3735,6 @@ interruptible_sleep_on_timeout(wait_queue_head_t *q, long timeout)
|
|||
|
||||
return timeout;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(interruptible_sleep_on_timeout);
|
||||
|
||||
void fastcall __sched sleep_on(wait_queue_head_t *q)
|
||||
|
|
@ -3737,7 +3747,6 @@ void fastcall __sched sleep_on(wait_queue_head_t *q)
|
|||
schedule();
|
||||
SLEEP_ON_TAIL
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(sleep_on);
|
||||
|
||||
long fastcall __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
|
||||
|
|
@ -3810,10 +3819,10 @@ void rt_mutex_setprio(task_t *p, int prio)
|
|||
|
||||
void set_user_nice(task_t *p, long nice)
|
||||
{
|
||||
int old_prio, delta;
|
||||
unsigned long flags;
|
||||
prio_array_t *array;
|
||||
runqueue_t *rq;
|
||||
int old_prio, delta;
|
||||
|
||||
if (TASK_NICE(p) == nice || nice < -20 || nice > 19)
|
||||
return;
|
||||
|
|
@ -3868,6 +3877,7 @@ int can_nice(const task_t *p, const int nice)
|
|||
{
|
||||
/* convert nice value [19,-20] to rlimit style value [1,40] */
|
||||
int nice_rlim = 20 - nice;
|
||||
|
||||
return (nice_rlim <= p->signal->rlim[RLIMIT_NICE].rlim_cur ||
|
||||
capable(CAP_SYS_NICE));
|
||||
}
|
||||
|
|
@ -3883,8 +3893,7 @@ int can_nice(const task_t *p, const int nice)
|
|||
*/
|
||||
asmlinkage long sys_nice(int increment)
|
||||
{
|
||||
int retval;
|
||||
long nice;
|
||||
long nice, retval;
|
||||
|
||||
/*
|
||||
* Setpriority might change our priority at the same moment.
|
||||
|
|
@ -3969,6 +3978,7 @@ static inline task_t *find_process_by_pid(pid_t pid)
|
|||
static void __setscheduler(struct task_struct *p, int policy, int prio)
|
||||
{
|
||||
BUG_ON(p->array);
|
||||
|
||||
p->policy = policy;
|
||||
p->rt_priority = prio;
|
||||
p->normal_prio = normal_prio(p);
|
||||
|
|
@ -3992,8 +4002,7 @@ static void __setscheduler(struct task_struct *p, int policy, int prio)
|
|||
int sched_setscheduler(struct task_struct *p, int policy,
|
||||
struct sched_param *param)
|
||||
{
|
||||
int retval;
|
||||
int oldprio, oldpolicy = -1;
|
||||
int retval, oldprio, oldpolicy = -1;
|
||||
prio_array_t *array;
|
||||
unsigned long flags;
|
||||
runqueue_t *rq;
|
||||
|
|
@ -4495,7 +4504,6 @@ void __sched yield(void)
|
|||
set_current_state(TASK_RUNNING);
|
||||
sys_sched_yield();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(yield);
|
||||
|
||||
/*
|
||||
|
|
@ -4513,7 +4521,6 @@ void __sched io_schedule(void)
|
|||
schedule();
|
||||
atomic_dec(&rq->nr_iowait);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(io_schedule);
|
||||
|
||||
long __sched io_schedule_timeout(long timeout)
|
||||
|
|
@ -4615,19 +4622,22 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
|
|||
|
||||
static inline struct task_struct *eldest_child(struct task_struct *p)
|
||||
{
|
||||
if (list_empty(&p->children)) return NULL;
|
||||
if (list_empty(&p->children))
|
||||
return NULL;
|
||||
return list_entry(p->children.next,struct task_struct,sibling);
|
||||
}
|
||||
|
||||
static inline struct task_struct *older_sibling(struct task_struct *p)
|
||||
{
|
||||
if (p->sibling.prev==&p->parent->children) return NULL;
|
||||
if (p->sibling.prev==&p->parent->children)
|
||||
return NULL;
|
||||
return list_entry(p->sibling.prev,struct task_struct,sibling);
|
||||
}
|
||||
|
||||
static inline struct task_struct *younger_sibling(struct task_struct *p)
|
||||
{
|
||||
if (p->sibling.next==&p->parent->children) return NULL;
|
||||
if (p->sibling.next==&p->parent->children)
|
||||
return NULL;
|
||||
return list_entry(p->sibling.next,struct task_struct,sibling);
|
||||
}
|
||||
|
||||
|
|
@ -4786,9 +4796,9 @@ cpumask_t nohz_cpu_mask = CPU_MASK_NONE;
|
|||
int set_cpus_allowed(task_t *p, cpumask_t new_mask)
|
||||
{
|
||||
unsigned long flags;
|
||||
int ret = 0;
|
||||
migration_req_t req;
|
||||
runqueue_t *rq;
|
||||
int ret = 0;
|
||||
|
||||
rq = task_rq_lock(p, &flags);
|
||||
if (!cpus_intersects(new_mask, cpu_online_map)) {
|
||||
|
|
@ -4811,9 +4821,9 @@ int set_cpus_allowed(task_t *p, cpumask_t new_mask)
|
|||
}
|
||||
out:
|
||||
task_rq_unlock(rq, &flags);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(set_cpus_allowed);
|
||||
|
||||
/*
|
||||
|
|
@ -4874,8 +4884,8 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
|
|||
*/
|
||||
static int migration_thread(void *data)
|
||||
{
|
||||
runqueue_t *rq;
|
||||
int cpu = (long)data;
|
||||
runqueue_t *rq;
|
||||
|
||||
rq = cpu_rq(cpu);
|
||||
BUG_ON(rq->migration_thread != current);
|
||||
|
|
@ -4932,7 +4942,7 @@ static int migration_thread(void *data)
|
|||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
/* Figure out where task on dead CPU should go, use force if neccessary. */
|
||||
static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *tsk)
|
||||
static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
|
||||
{
|
||||
runqueue_t *rq;
|
||||
unsigned long flags;
|
||||
|
|
@ -4942,18 +4952,18 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *tsk)
|
|||
restart:
|
||||
/* On same node? */
|
||||
mask = node_to_cpumask(cpu_to_node(dead_cpu));
|
||||
cpus_and(mask, mask, tsk->cpus_allowed);
|
||||
cpus_and(mask, mask, p->cpus_allowed);
|
||||
dest_cpu = any_online_cpu(mask);
|
||||
|
||||
/* On any allowed CPU? */
|
||||
if (dest_cpu == NR_CPUS)
|
||||
dest_cpu = any_online_cpu(tsk->cpus_allowed);
|
||||
dest_cpu = any_online_cpu(p->cpus_allowed);
|
||||
|
||||
/* No more Mr. Nice Guy. */
|
||||
if (dest_cpu == NR_CPUS) {
|
||||
rq = task_rq_lock(tsk, &flags);
|
||||
cpus_setall(tsk->cpus_allowed);
|
||||
dest_cpu = any_online_cpu(tsk->cpus_allowed);
|
||||
rq = task_rq_lock(p, &flags);
|
||||
cpus_setall(p->cpus_allowed);
|
||||
dest_cpu = any_online_cpu(p->cpus_allowed);
|
||||
task_rq_unlock(rq, &flags);
|
||||
|
||||
/*
|
||||
|
|
@ -4961,12 +4971,12 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *tsk)
|
|||
* kernel threads (both mm NULL), since they never
|
||||
* leave kernel.
|
||||
*/
|
||||
if (tsk->mm && printk_ratelimit())
|
||||
if (p->mm && printk_ratelimit())
|
||||
printk(KERN_INFO "process %d (%s) no "
|
||||
"longer affine to cpu%d\n",
|
||||
tsk->pid, tsk->comm, dead_cpu);
|
||||
p->pid, p->comm, dead_cpu);
|
||||
}
|
||||
if (!__migrate_task(tsk, dead_cpu, dest_cpu))
|
||||
if (!__migrate_task(p, dead_cpu, dest_cpu))
|
||||
goto restart;
|
||||
}
|
||||
|
||||
|
|
@ -4993,48 +5003,51 @@ static void migrate_nr_uninterruptible(runqueue_t *rq_src)
|
|||
/* Run through task list and migrate tasks from the dead cpu. */
|
||||
static void migrate_live_tasks(int src_cpu)
|
||||
{
|
||||
struct task_struct *tsk, *t;
|
||||
struct task_struct *p, *t;
|
||||
|
||||
write_lock_irq(&tasklist_lock);
|
||||
|
||||
do_each_thread(t, tsk) {
|
||||
if (tsk == current)
|
||||
do_each_thread(t, p) {
|
||||
if (p == current)
|
||||
continue;
|
||||
|
||||
if (task_cpu(tsk) == src_cpu)
|
||||
move_task_off_dead_cpu(src_cpu, tsk);
|
||||
} while_each_thread(t, tsk);
|
||||
if (task_cpu(p) == src_cpu)
|
||||
move_task_off_dead_cpu(src_cpu, p);
|
||||
} while_each_thread(t, p);
|
||||
|
||||
write_unlock_irq(&tasklist_lock);
|
||||
}
|
||||
|
||||
/* Schedules idle task to be the next runnable task on current CPU.
|
||||
* It does so by boosting its priority to highest possible and adding it to
|
||||
* the _front_ of runqueue. Used by CPU offline code.
|
||||
* the _front_ of the runqueue. Used by CPU offline code.
|
||||
*/
|
||||
void sched_idle_next(void)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
runqueue_t *rq = this_rq();
|
||||
int this_cpu = smp_processor_id();
|
||||
runqueue_t *rq = cpu_rq(this_cpu);
|
||||
struct task_struct *p = rq->idle;
|
||||
unsigned long flags;
|
||||
|
||||
/* cpu has to be offline */
|
||||
BUG_ON(cpu_online(cpu));
|
||||
BUG_ON(cpu_online(this_cpu));
|
||||
|
||||
/* Strictly not necessary since rest of the CPUs are stopped by now
|
||||
* and interrupts disabled on current cpu.
|
||||
/*
|
||||
* Strictly not necessary since rest of the CPUs are stopped by now
|
||||
* and interrupts disabled on the current cpu.
|
||||
*/
|
||||
spin_lock_irqsave(&rq->lock, flags);
|
||||
|
||||
__setscheduler(p, SCHED_FIFO, MAX_RT_PRIO-1);
|
||||
/* Add idle task to _front_ of it's priority queue */
|
||||
|
||||
/* Add idle task to the _front_ of its priority queue: */
|
||||
__activate_idle_task(p, rq);
|
||||
|
||||
spin_unlock_irqrestore(&rq->lock, flags);
|
||||
}
|
||||
|
||||
/* Ensures that the idle task is using init_mm right before its cpu goes
|
||||
/*
|
||||
* Ensures that the idle task is using init_mm right before its cpu goes
|
||||
* offline.
|
||||
*/
|
||||
void idle_task_exit(void)
|
||||
|
|
@ -5048,17 +5061,17 @@ void idle_task_exit(void)
|
|||
mmdrop(mm);
|
||||
}
|
||||
|
||||
static void migrate_dead(unsigned int dead_cpu, task_t *tsk)
|
||||
static void migrate_dead(unsigned int dead_cpu, task_t *p)
|
||||
{
|
||||
struct runqueue *rq = cpu_rq(dead_cpu);
|
||||
|
||||
/* Must be exiting, otherwise would be on tasklist. */
|
||||
BUG_ON(tsk->exit_state != EXIT_ZOMBIE && tsk->exit_state != EXIT_DEAD);
|
||||
BUG_ON(p->exit_state != EXIT_ZOMBIE && p->exit_state != EXIT_DEAD);
|
||||
|
||||
/* Cannot have done final schedule yet: would have vanished. */
|
||||
BUG_ON(tsk->flags & PF_DEAD);
|
||||
BUG_ON(p->flags & PF_DEAD);
|
||||
|
||||
get_task_struct(tsk);
|
||||
get_task_struct(p);
|
||||
|
||||
/*
|
||||
* Drop lock around migration; if someone else moves it,
|
||||
|
|
@ -5066,21 +5079,22 @@ static void migrate_dead(unsigned int dead_cpu, task_t *tsk)
|
|||
* fine.
|
||||
*/
|
||||
spin_unlock_irq(&rq->lock);
|
||||
move_task_off_dead_cpu(dead_cpu, tsk);
|
||||
move_task_off_dead_cpu(dead_cpu, p);
|
||||
spin_lock_irq(&rq->lock);
|
||||
|
||||
put_task_struct(tsk);
|
||||
put_task_struct(p);
|
||||
}
|
||||
|
||||
/* release_task() removes task from tasklist, so we won't find dead tasks. */
|
||||
static void migrate_dead_tasks(unsigned int dead_cpu)
|
||||
{
|
||||
unsigned arr, i;
|
||||
struct runqueue *rq = cpu_rq(dead_cpu);
|
||||
unsigned int arr, i;
|
||||
|
||||
for (arr = 0; arr < 2; arr++) {
|
||||
for (i = 0; i < MAX_PRIO; i++) {
|
||||
struct list_head *list = &rq->arrays[arr].queue[i];
|
||||
|
||||
while (!list_empty(list))
|
||||
migrate_dead(dead_cpu,
|
||||
list_entry(list->next, task_t,
|
||||
|
|
@ -5094,12 +5108,11 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
|
|||
* migration_call - callback that gets triggered when a CPU is added.
|
||||
* Here we can start up the necessary migration thread for the new CPU.
|
||||
*/
|
||||
static int __cpuinit migration_call(struct notifier_block *nfb,
|
||||
unsigned long action,
|
||||
void *hcpu)
|
||||
static int __cpuinit
|
||||
migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
|
||||
{
|
||||
int cpu = (long)hcpu;
|
||||
struct task_struct *p;
|
||||
int cpu = (long)hcpu;
|
||||
struct runqueue *rq;
|
||||
unsigned long flags;
|
||||
|
||||
|
|
@ -5116,10 +5129,12 @@ static int __cpuinit migration_call(struct notifier_block *nfb,
|
|||
task_rq_unlock(rq, &flags);
|
||||
cpu_rq(cpu)->migration_thread = p;
|
||||
break;
|
||||
|
||||
case CPU_ONLINE:
|
||||
/* Strictly unneccessary, as first user will wake it. */
|
||||
wake_up_process(cpu_rq(cpu)->migration_thread);
|
||||
break;
|
||||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
case CPU_UP_CANCELED:
|
||||
if (!cpu_rq(cpu)->migration_thread)
|
||||
|
|
@ -5130,6 +5145,7 @@ static int __cpuinit migration_call(struct notifier_block *nfb,
|
|||
kthread_stop(cpu_rq(cpu)->migration_thread);
|
||||
cpu_rq(cpu)->migration_thread = NULL;
|
||||
break;
|
||||
|
||||
case CPU_DEAD:
|
||||
migrate_live_tasks(cpu);
|
||||
rq = cpu_rq(cpu);
|
||||
|
|
@ -5174,10 +5190,12 @@ static struct notifier_block __cpuinitdata migration_notifier = {
|
|||
int __init migration_init(void)
|
||||
{
|
||||
void *cpu = (void *)(long)smp_processor_id();
|
||||
/* Start one for boot CPU. */
|
||||
|
||||
/* Start one for the boot CPU: */
|
||||
migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
|
||||
migration_call(&migration_notifier, CPU_ONLINE, cpu);
|
||||
register_cpu_notifier(&migration_notifier);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
|
@ -5273,7 +5291,7 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu)
|
|||
} while (sd);
|
||||
}
|
||||
#else
|
||||
#define sched_domain_debug(sd, cpu) {}
|
||||
# define sched_domain_debug(sd, cpu) do { } while (0)
|
||||
#endif
|
||||
|
||||
static int sd_degenerate(struct sched_domain *sd)
|
||||
|
|
@ -5299,8 +5317,8 @@ static int sd_degenerate(struct sched_domain *sd)
|
|||
return 1;
|
||||
}
|
||||
|
||||
static int sd_parent_degenerate(struct sched_domain *sd,
|
||||
struct sched_domain *parent)
|
||||
static int
|
||||
sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
|
||||
{
|
||||
unsigned long cflags = sd->flags, pflags = parent->flags;
|
||||
|
||||
|
|
@ -5595,8 +5613,8 @@ static void touch_cache(void *__cache, unsigned long __size)
|
|||
/*
|
||||
* Measure the cache-cost of one task migration. Returns in units of nsec.
|
||||
*/
|
||||
static unsigned long long measure_one(void *cache, unsigned long size,
|
||||
int source, int target)
|
||||
static unsigned long long
|
||||
measure_one(void *cache, unsigned long size, int source, int target)
|
||||
{
|
||||
cpumask_t mask, saved_mask;
|
||||
unsigned long long t0, t1, t2, t3, cost;
|
||||
|
|
@ -5946,9 +5964,9 @@ static int find_next_best_node(int node, unsigned long *used_nodes)
|
|||
*/
|
||||
static cpumask_t sched_domain_node_span(int node)
|
||||
{
|
||||
int i;
|
||||
cpumask_t span, nodemask;
|
||||
DECLARE_BITMAP(used_nodes, MAX_NUMNODES);
|
||||
cpumask_t span, nodemask;
|
||||
int i;
|
||||
|
||||
cpus_clear(span);
|
||||
bitmap_zero(used_nodes, MAX_NUMNODES);
|
||||
|
|
@ -5959,6 +5977,7 @@ static cpumask_t sched_domain_node_span(int node)
|
|||
|
||||
for (i = 1; i < SD_NODES_PER_DOMAIN; i++) {
|
||||
int next_node = find_next_best_node(node, used_nodes);
|
||||
|
||||
nodemask = node_to_cpumask(next_node);
|
||||
cpus_or(span, span, nodemask);
|
||||
}
|
||||
|
|
@ -5968,19 +5987,23 @@ static cpumask_t sched_domain_node_span(int node)
|
|||
#endif
|
||||
|
||||
int sched_smt_power_savings = 0, sched_mc_power_savings = 0;
|
||||
|
||||
/*
|
||||
* At the moment, CONFIG_SCHED_SMT is never defined, but leave it in so we
|
||||
* can switch it on easily if needed.
|
||||
* SMT sched-domains:
|
||||
*/
|
||||
#ifdef CONFIG_SCHED_SMT
|
||||
static DEFINE_PER_CPU(struct sched_domain, cpu_domains);
|
||||
static struct sched_group sched_group_cpus[NR_CPUS];
|
||||
|
||||
static int cpu_to_cpu_group(int cpu)
|
||||
{
|
||||
return cpu;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* multi-core sched-domains:
|
||||
*/
|
||||
#ifdef CONFIG_SCHED_MC
|
||||
static DEFINE_PER_CPU(struct sched_domain, core_domains);
|
||||
static struct sched_group *sched_group_core_bycpu[NR_CPUS];
|
||||
|
|
@ -6000,9 +6023,10 @@ static int cpu_to_core_group(int cpu)
|
|||
|
||||
static DEFINE_PER_CPU(struct sched_domain, phys_domains);
|
||||
static struct sched_group *sched_group_phys_bycpu[NR_CPUS];
|
||||
|
||||
static int cpu_to_phys_group(int cpu)
|
||||
{
|
||||
#if defined(CONFIG_SCHED_MC)
|
||||
#ifdef CONFIG_SCHED_MC
|
||||
cpumask_t mask = cpu_coregroup_map(cpu);
|
||||
return first_cpu(mask);
|
||||
#elif defined(CONFIG_SCHED_SMT)
|
||||
|
|
@ -6548,6 +6572,7 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
|
|||
int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
#ifdef CONFIG_SCHED_SMT
|
||||
if (smt_capable())
|
||||
err = sysfs_create_file(&cls->kset.kobj,
|
||||
|
|
@ -6567,7 +6592,8 @@ static ssize_t sched_mc_power_savings_show(struct sys_device *dev, char *page)
|
|||
{
|
||||
return sprintf(page, "%u\n", sched_mc_power_savings);
|
||||
}
|
||||
static ssize_t sched_mc_power_savings_store(struct sys_device *dev, const char *buf, size_t count)
|
||||
static ssize_t sched_mc_power_savings_store(struct sys_device *dev,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
return sched_power_savings_store(buf, count, 0);
|
||||
}
|
||||
|
|
@ -6580,7 +6606,8 @@ static ssize_t sched_smt_power_savings_show(struct sys_device *dev, char *page)
|
|||
{
|
||||
return sprintf(page, "%u\n", sched_smt_power_savings);
|
||||
}
|
||||
static ssize_t sched_smt_power_savings_store(struct sys_device *dev, const char *buf, size_t count)
|
||||
static ssize_t sched_smt_power_savings_store(struct sys_device *dev,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
return sched_power_savings_store(buf, count, 1);
|
||||
}
|
||||
|
|
@ -6642,6 +6669,7 @@ int in_sched_functions(unsigned long addr)
|
|||
{
|
||||
/* Linker adds these: start and end of __sched functions */
|
||||
extern char __sched_text_start[], __sched_text_end[];
|
||||
|
||||
return in_lock_functions(addr) ||
|
||||
(addr >= (unsigned long)__sched_text_start
|
||||
&& addr < (unsigned long)__sched_text_end);
|
||||
|
|
@ -6649,11 +6677,11 @@ int in_sched_functions(unsigned long addr)
|
|||
|
||||
void __init sched_init(void)
|
||||
{
|
||||
runqueue_t *rq;
|
||||
int i, j, k;
|
||||
|
||||
for_each_possible_cpu(i) {
|
||||
prio_array_t *array;
|
||||
runqueue_t *rq;
|
||||
|
||||
rq = cpu_rq(i);
|
||||
spin_lock_init(&rq->lock);
|
||||
|
|
@ -6704,7 +6732,7 @@ void __init sched_init(void)
|
|||
#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
|
||||
void __might_sleep(char *file, int line)
|
||||
{
|
||||
#if defined(in_atomic)
|
||||
#ifdef in_atomic
|
||||
static unsigned long prev_jiffy; /* ratelimiting */
|
||||
|
||||
if ((in_atomic() || irqs_disabled()) &&
|
||||
|
|
|
|||
Loading…
Reference in a new issue