FreeBSD/Linux Kernel Cross Reference
sys/kernel/sched_stats.h

     
     #ifdef CONFIG_SCHEDSTATS
     /*
      * bump this up when changing the output format or the meaning of an existing
      * format, so that tools can adapt (or abort)
      */
     #define SCHEDSTAT_VERSION 15
     
     static int show_schedstat(struct seq_file *seq, void *v)
    {
            int cpu;
            int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
            char *mask_str = kmalloc(mask_len, GFP_KERNEL);
    
            if (mask_str == NULL)
                    return -ENOMEM;
    
            seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
            seq_printf(seq, "timestamp %lu\n", jiffies);
            for_each_online_cpu(cpu) {
                    struct rq *rq = cpu_rq(cpu);
    #ifdef CONFIG_SMP
                    struct sched_domain *sd;
                    int dcount = 0;
    #endif
    
                    /* runqueue-specific stats */
                    seq_printf(seq,
                        "cpu%d %u %u %u %u %u %u %llu %llu %lu",
                        cpu, rq->yld_count,
                        rq->sched_switch, rq->sched_count, rq->sched_goidle,
                        rq->ttwu_count, rq->ttwu_local,
                        rq->rq_cpu_time,
                        rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
    
                    seq_printf(seq, "\n");
    
    #ifdef CONFIG_SMP
                    /* domain-specific stats */
                    rcu_read_lock();
                    for_each_domain(cpu, sd) {
                            enum cpu_idle_type itype;
    
                            cpumask_scnprintf(mask_str, mask_len,
                                              sched_domain_span(sd));
                            seq_printf(seq, "domain%d %s", dcount++, mask_str);
                            for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
                                            itype++) {
                                    seq_printf(seq, " %u %u %u %u %u %u %u %u",
                                        sd->lb_count[itype],
                                        sd->lb_balanced[itype],
                                        sd->lb_failed[itype],
                                        sd->lb_imbalance[itype],
                                        sd->lb_gained[itype],
                                        sd->lb_hot_gained[itype],
                                        sd->lb_nobusyq[itype],
                                        sd->lb_nobusyg[itype]);
                            }
                            seq_printf(seq,
                                       " %u %u %u %u %u %u %u %u %u %u %u %u\n",
                                sd->alb_count, sd->alb_failed, sd->alb_pushed,
                                sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
                                sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
                                sd->ttwu_wake_remote, sd->ttwu_move_affine,
                                sd->ttwu_move_balance);
                    }
                    rcu_read_unlock();
    #endif
            }
            kfree(mask_str);
            return 0;
    }
    
    static int schedstat_open(struct inode *inode, struct file *file)
    {
            unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
            char *buf = kmalloc(size, GFP_KERNEL);
            struct seq_file *m;
            int res;
    
            if (!buf)
                    return -ENOMEM;
            res = single_open(file, show_schedstat, NULL);
            if (!res) {
                    m = file->private_data;
                    m->buf = buf;
                    m->size = size;
            } else
                    kfree(buf);
            return res;
    }
    
    static const struct file_operations proc_schedstat_operations = {
            .open    = schedstat_open,
            .read    = seq_read,
            .llseek  = seq_lseek,
            .release = single_release,
    };
    
   static int __init proc_schedstat_init(void)
   {
           proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
           return 0;
   }
   module_init(proc_schedstat_init);
   
   /*
    * Expects runqueue lock to be held for atomicity of update
    */
   static inline void
   rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
   {
           if (rq) {
                   rq->rq_sched_info.run_delay += delta;
                   rq->rq_sched_info.pcount++;
           }
   }
   
   /*
    * Expects runqueue lock to be held for atomicity of update
    */
   static inline void
   rq_sched_info_depart(struct rq *rq, unsigned long long delta)
   {
           if (rq)
                   rq->rq_cpu_time += delta;
   }
   
   static inline void
   rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
   {
           if (rq)
                   rq->rq_sched_info.run_delay += delta;
   }
   # define schedstat_inc(rq, field)       do { (rq)->field++; } while (0)
   # define schedstat_add(rq, field, amt)  do { (rq)->field += (amt); } while (0)
   # define schedstat_set(var, val)        do { var = (val); } while (0)
   #else /* !CONFIG_SCHEDSTATS */
   static inline void
   rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
   {}
   static inline void
   rq_sched_info_dequeued(struct rq *rq, unsigned long long delta)
   {}
   static inline void
   rq_sched_info_depart(struct rq *rq, unsigned long long delta)
   {}
   # define schedstat_inc(rq, field)       do { } while (0)
   # define schedstat_add(rq, field, amt)  do { } while (0)
   # define schedstat_set(var, val)        do { } while (0)
   #endif
   
   #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
   static inline void sched_info_reset_dequeued(struct task_struct *t)
   {
           t->sched_info.last_queued = 0;
   }
   
   /*
    * We are interested in knowing how long it was from the *first* time a
    * task was queued to the time that it finally hit a cpu, we call this routine
    * from dequeue_task() to account for possible rq->clock skew across cpus. The
    * delta taken on each cpu would annul the skew.
    */
   static inline void sched_info_dequeued(struct task_struct *t)
   {
           unsigned long long now = task_rq(t)->clock, delta = 0;
   
           if (unlikely(sched_info_on()))
                   if (t->sched_info.last_queued)
                           delta = now - t->sched_info.last_queued;
           sched_info_reset_dequeued(t);
           t->sched_info.run_delay += delta;
   
           rq_sched_info_dequeued(task_rq(t), delta);
   }
   
   /*
    * Called when a task finally hits the cpu.  We can now calculate how
    * long it was waiting to run.  We also note when it began so that we
    * can keep stats on how long its timeslice is.
    */
   static void sched_info_arrive(struct task_struct *t)
   {
           unsigned long long now = task_rq(t)->clock, delta = 0;
   
           if (t->sched_info.last_queued)
                   delta = now - t->sched_info.last_queued;
           sched_info_reset_dequeued(t);
           t->sched_info.run_delay += delta;
           t->sched_info.last_arrival = now;
           t->sched_info.pcount++;
   
           rq_sched_info_arrive(task_rq(t), delta);
   }
   
   /*
    * This function is only called from enqueue_task(), but also only updates
    * the timestamp if it is already not set.  It's assumed that
    * sched_info_dequeued() will clear that stamp when appropriate.
    */
   static inline void sched_info_queued(struct task_struct *t)
   {
           if (unlikely(sched_info_on()))
                   if (!t->sched_info.last_queued)
                           t->sched_info.last_queued = task_rq(t)->clock;
   }
   
   /*
    * Called when a process ceases being the active-running process, either
    * voluntarily or involuntarily.  Now we can calculate how long we ran.
    * Also, if the process is still in the TASK_RUNNING state, call
    * sched_info_queued() to mark that it has now again started waiting on
    * the runqueue.
    */
   static inline void sched_info_depart(struct task_struct *t)
   {
           unsigned long long delta = task_rq(t)->clock -
                                           t->sched_info.last_arrival;
   
           rq_sched_info_depart(task_rq(t), delta);
   
           if (t->state == TASK_RUNNING)
                   sched_info_queued(t);
   }
   
   /*
    * Called when tasks are switched involuntarily due, typically, to expiring
    * their time slice.  (This may also be called when switching to or from
    * the idle task.)  We are only called when prev != next.
    */
   static inline void
   __sched_info_switch(struct task_struct *prev, struct task_struct *next)
   {
           struct rq *rq = task_rq(prev);
   
           /*
            * prev now departs the cpu.  It's not interesting to record
            * stats about how efficient we were at scheduling the idle
            * process, however.
            */
           if (prev != rq->idle)
                   sched_info_depart(prev);
   
           if (next != rq->idle)
                   sched_info_arrive(next);
   }
   static inline void
   sched_info_switch(struct task_struct *prev, struct task_struct *next)
   {
           if (unlikely(sched_info_on()))
                   __sched_info_switch(prev, next);
   }
   #else
   #define sched_info_queued(t)                    do { } while (0)
   #define sched_info_reset_dequeued(t)    do { } while (0)
   #define sched_info_dequeued(t)                  do { } while (0)
   #define sched_info_switch(t, next)              do { } while (0)
   #endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
   
   /*
    * The following are functions that support scheduler-internal time accounting.
    * These functions are generally called at the timer tick.  None of this depends
    * on CONFIG_SCHEDSTATS.
    */
   
   /**
    * account_group_user_time - Maintain utime for a thread group.
    *
    * @tsk:        Pointer to task structure.
    * @cputime:    Time value by which to increment the utime field of the
    *              thread_group_cputime structure.
    *
    * If thread group time is being maintained, get the structure for the
    * running CPU and update the utime field there.
    */
   static inline void account_group_user_time(struct task_struct *tsk,
                                              cputime_t cputime)
   {
           struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
   
           if (!cputimer->running)
                   return;
   
           spin_lock(&cputimer->lock);
           cputimer->cputime.utime =
                   cputime_add(cputimer->cputime.utime, cputime);
           spin_unlock(&cputimer->lock);
   }
   
   /**
    * account_group_system_time - Maintain stime for a thread group.
    *
    * @tsk:        Pointer to task structure.
    * @cputime:    Time value by which to increment the stime field of the
    *              thread_group_cputime structure.
    *
    * If thread group time is being maintained, get the structure for the
    * running CPU and update the stime field there.
    */
   static inline void account_group_system_time(struct task_struct *tsk,
                                                cputime_t cputime)
   {
           struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
   
           if (!cputimer->running)
                   return;
   
           spin_lock(&cputimer->lock);
           cputimer->cputime.stime =
                   cputime_add(cputimer->cputime.stime, cputime);
           spin_unlock(&cputimer->lock);
   }
   
   /**
    * account_group_exec_runtime - Maintain exec runtime for a thread group.
    *
    * @tsk:        Pointer to task structure.
    * @ns:         Time value by which to increment the sum_exec_runtime field
    *              of the thread_group_cputime structure.
    *
    * If thread group time is being maintained, get the structure for the
    * running CPU and update the sum_exec_runtime field there.
    */
   static inline void account_group_exec_runtime(struct task_struct *tsk,
                                                 unsigned long long ns)
   {
           struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
   
           if (!cputimer->running)
                   return;
   
           spin_lock(&cputimer->lock);
           cputimer->cputime.sum_exec_runtime += ns;
           spin_unlock(&cputimer->lock);
   }

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