#ifdef CONFIG_SCHEDSTATS /* * 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 rq *rq, struct task_struct *t){	unsigned long long now = rq_clock(rq), 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(rq, 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 rq *rq, struct task_struct *t){	unsigned long long now = rq_clock(rq), 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(rq, 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 rq *rq, struct task_struct *t){	if (unlikely(sched_info_on()))		if (!t->sched_info.last_queued)			t->sched_info.last_queued = rq_clock(rq);} /* * Called when a process ceases being the active-running process involuntarily * due, typically, to expiring its time slice (this may also be called when * switching to the idle task).  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 rq *rq, struct task_struct *t){	unsigned long long delta = rq_clock(rq) -					t->sched_info.last_arrival; 	rq_sched_info_depart(rq, delta); 	if (t->state == TASK_RUNNING)		sched_info_queued(rq, 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 rq *rq,		    struct task_struct *prev, struct task_struct *next){	/*	 * 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(rq, prev); 	if (next != rq->idle)		sched_info_arrive(rq, next);}static inline voidsched_info_switch(struct rq *rq,		  struct task_struct *prev, struct task_struct *next){	if (unlikely(sched_info_on()))		__sched_info_switch(rq, prev, next);}#else#define sched_info_queued(rq, t)		do { } while (0)#define sched_info_reset_dequeued(t)	do { } while (0)#define sched_info_dequeued(rq, t)		do { } while (0)#define sched_info_depart(rq, t)		do { } while (0)#define sched_info_arrive(rq, next)		do { } while (0)#define sched_info_switch(rq, 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. */ /** * cputimer_running - return true if cputimer is running * * @tsk:	Pointer to target task. */static inline bool cputimer_running(struct task_struct *tsk) {	struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; 	if (!cputimer->running)		return false; 	/*	 * After we flush the task's sum_exec_runtime to sig->sum_sched_runtime	 * in __exit_signal(), we won't account to the signal struct further	 * cputime consumed by that task, even though the task can still be	 * ticking after __exit_signal().	 *	 * In order to keep a consistent behaviour between thread group cputime	 * and thread group cputimer accounting, lets also ignore the cputime	 * elapsing after __exit_signal() in any thread group timer running.	 *	 * This makes sure that POSIX CPU clocks and timers are synchronized, so	 * that a POSIX CPU timer won't expire while the corresponding POSIX CPU	 * clock delta is behind the expiring timer value.	 */	if (unlikely(!tsk->sighand))		return false; 	return true;} /** * 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(tsk))		return; 	raw_spin_lock(&cputimer->lock);	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(tsk))		return; 	raw_spin_lock(&cputimer->lock);	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(tsk))		return; 	raw_spin_lock(&cputimer->lock);	cputimer->cputime.sum_exec_runtime += ns;	raw_spin_unlock(&cputimer->lock);}