#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 voidrq_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 voidrq_sched_info_depart(struct rq *rq, unsigned long long delta){	if (rq)		rq->rq_cpu_time += delta;} static inline voidrq_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 voidrq_sched_info_arrive(struct rq *rq, unsigned long long delta){}static inline voidrq_sched_info_dequeued(struct rq *rq, unsigned long long delta){}static inline voidrq_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 voidsched_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; 	raw_spin_lock(&cputimer->lock);	cputimer->cputime.utime =		cputime_add(cputimer->cputime.utime, cputime);	raw_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; 	raw_spin_lock(&cputimer->lock);	cputimer->cputime.stime =		cputime_add(cputimer->cputime.stime, cputime);	raw_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; 	raw_spin_lock(&cputimer->lock);	cputimer->cputime.sum_exec_runtime += ns;	raw_spin_unlock(&cputimer->lock);}