236 lines
7.0 KiB
C
236 lines
7.0 KiB
C
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#ifdef CONFIG_SCHEDSTATS
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/*
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* bump this up when changing the output format or the meaning of an existing
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* format, so that tools can adapt (or abort)
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*/
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#define SCHEDSTAT_VERSION 14
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static int show_schedstat(struct seq_file *seq, void *v)
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{
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int cpu;
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seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
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seq_printf(seq, "timestamp %lu\n", jiffies);
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for_each_online_cpu(cpu) {
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struct rq *rq = cpu_rq(cpu);
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#ifdef CONFIG_SMP
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struct sched_domain *sd;
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int dcnt = 0;
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#endif
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/* runqueue-specific stats */
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seq_printf(seq,
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"cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %llu %llu %lu",
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cpu, rq->yld_both_empty,
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rq->yld_act_empty, rq->yld_exp_empty, rq->yld_cnt,
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rq->sched_switch, rq->sched_cnt, rq->sched_goidle,
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rq->ttwu_cnt, rq->ttwu_local,
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rq->rq_sched_info.cpu_time,
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rq->rq_sched_info.run_delay, rq->rq_sched_info.pcnt);
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seq_printf(seq, "\n");
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#ifdef CONFIG_SMP
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/* domain-specific stats */
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preempt_disable();
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for_each_domain(cpu, sd) {
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enum cpu_idle_type itype;
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char mask_str[NR_CPUS];
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cpumask_scnprintf(mask_str, NR_CPUS, sd->span);
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seq_printf(seq, "domain%d %s", dcnt++, mask_str);
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for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
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itype++) {
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seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu "
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"%lu",
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sd->lb_cnt[itype],
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sd->lb_balanced[itype],
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sd->lb_failed[itype],
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sd->lb_imbalance[itype],
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sd->lb_gained[itype],
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sd->lb_hot_gained[itype],
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sd->lb_nobusyq[itype],
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sd->lb_nobusyg[itype]);
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}
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seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu %lu %lu"
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" %lu %lu %lu\n",
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sd->alb_cnt, sd->alb_failed, sd->alb_pushed,
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sd->sbe_cnt, sd->sbe_balanced, sd->sbe_pushed,
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sd->sbf_cnt, sd->sbf_balanced, sd->sbf_pushed,
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sd->ttwu_wake_remote, sd->ttwu_move_affine,
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sd->ttwu_move_balance);
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}
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preempt_enable();
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#endif
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}
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return 0;
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}
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static int schedstat_open(struct inode *inode, struct file *file)
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{
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unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
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char *buf = kmalloc(size, GFP_KERNEL);
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struct seq_file *m;
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int res;
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if (!buf)
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return -ENOMEM;
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res = single_open(file, show_schedstat, NULL);
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if (!res) {
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m = file->private_data;
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m->buf = buf;
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m->size = size;
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} else
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kfree(buf);
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return res;
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}
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const struct file_operations proc_schedstat_operations = {
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.open = schedstat_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/*
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* Expects runqueue lock to be held for atomicity of update
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*/
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static inline void
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rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
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{
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if (rq) {
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rq->rq_sched_info.run_delay += delta;
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rq->rq_sched_info.pcnt++;
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}
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}
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/*
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* Expects runqueue lock to be held for atomicity of update
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*/
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static inline void
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rq_sched_info_depart(struct rq *rq, unsigned long long delta)
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{
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if (rq)
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rq->rq_sched_info.cpu_time += delta;
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}
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# define schedstat_inc(rq, field) do { (rq)->field++; } while (0)
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# define schedstat_add(rq, field, amt) do { (rq)->field += (amt); } while (0)
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#else /* !CONFIG_SCHEDSTATS */
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static inline void
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rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
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{}
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static inline void
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rq_sched_info_depart(struct rq *rq, unsigned long long delta)
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{}
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# define schedstat_inc(rq, field) do { } while (0)
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# define schedstat_add(rq, field, amt) do { } while (0)
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#endif
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#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
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/*
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* Called when a process is dequeued from the active array and given
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* the cpu. We should note that with the exception of interactive
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* tasks, the expired queue will become the active queue after the active
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* queue is empty, without explicitly dequeuing and requeuing tasks in the
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* expired queue. (Interactive tasks may be requeued directly to the
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* active queue, thus delaying tasks in the expired queue from running;
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* see scheduler_tick()).
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*
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* This function is only called from sched_info_arrive(), rather than
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* dequeue_task(). Even though a task may be queued and dequeued multiple
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* times as it is shuffled about, we're really interested in knowing how
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* long it was from the *first* time it was queued to the time that it
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* finally hit a cpu.
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*/
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static inline void sched_info_dequeued(struct task_struct *t)
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{
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t->sched_info.last_queued = 0;
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}
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/*
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* Called when a task finally hits the cpu. We can now calculate how
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* long it was waiting to run. We also note when it began so that we
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* can keep stats on how long its timeslice is.
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*/
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static void sched_info_arrive(struct task_struct *t)
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{
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unsigned long long now = sched_clock(), delta = 0;
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if (t->sched_info.last_queued)
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delta = now - t->sched_info.last_queued;
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sched_info_dequeued(t);
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t->sched_info.run_delay += delta;
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t->sched_info.last_arrival = now;
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t->sched_info.pcnt++;
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rq_sched_info_arrive(task_rq(t), delta);
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}
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/*
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* Called when a process is queued into either the active or expired
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* array. The time is noted and later used to determine how long we
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* had to wait for us to reach the cpu. Since the expired queue will
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* become the active queue after active queue is empty, without dequeuing
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* and requeuing any tasks, we are interested in queuing to either. It
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* is unusual but not impossible for tasks to be dequeued and immediately
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* requeued in the same or another array: this can happen in sched_yield(),
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* set_user_nice(), and even load_balance() as it moves tasks from runqueue
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* to runqueue.
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*
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* This function is only called from enqueue_task(), but also only updates
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* the timestamp if it is already not set. It's assumed that
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* sched_info_dequeued() will clear that stamp when appropriate.
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*/
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static inline void sched_info_queued(struct task_struct *t)
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{
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if (unlikely(sched_info_on()))
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if (!t->sched_info.last_queued)
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t->sched_info.last_queued = sched_clock();
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}
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/*
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* Called when a process ceases being the active-running process, either
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* voluntarily or involuntarily. Now we can calculate how long we ran.
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*/
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static inline void sched_info_depart(struct task_struct *t)
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{
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unsigned long long delta = sched_clock() - t->sched_info.last_arrival;
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t->sched_info.cpu_time += delta;
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rq_sched_info_depart(task_rq(t), delta);
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}
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/*
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* Called when tasks are switched involuntarily due, typically, to expiring
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* their time slice. (This may also be called when switching to or from
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* the idle task.) We are only called when prev != next.
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*/
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static inline void
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__sched_info_switch(struct task_struct *prev, struct task_struct *next)
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{
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struct rq *rq = task_rq(prev);
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/*
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* prev now departs the cpu. It's not interesting to record
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* stats about how efficient we were at scheduling the idle
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* process, however.
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*/
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if (prev != rq->idle)
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sched_info_depart(prev);
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if (next != rq->idle)
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sched_info_arrive(next);
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}
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static inline void
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sched_info_switch(struct task_struct *prev, struct task_struct *next)
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{
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if (unlikely(sched_info_on()))
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__sched_info_switch(prev, next);
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}
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#else
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#define sched_info_queued(t) do { } while (0)
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#define sched_info_switch(t, next) do { } while (0)
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#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
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