232 lines
6.6 KiB
C
232 lines
6.6 KiB
C
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#ifdef CONFIG_SCHEDSTATS
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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.pcount++;
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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_cpu_time += delta;
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}
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static inline void
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rq_sched_info_dequeued(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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}
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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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# define schedstat_set(var, val) do { var = (val); } 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_dequeued(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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# define schedstat_set(var, val) 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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static inline void sched_info_reset_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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* We are interested in knowing how long it was from the *first* time a
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* task was queued to the time that it finally hit a cpu, we call this routine
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* from dequeue_task() to account for possible rq->clock skew across cpus. The
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* delta taken on each cpu would annul the skew.
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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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unsigned long long now = task_rq(t)->clock, delta = 0;
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if (unlikely(sched_info_on()))
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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_reset_dequeued(t);
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t->sched_info.run_delay += delta;
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rq_sched_info_dequeued(task_rq(t), delta);
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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 = task_rq(t)->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_reset_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.pcount++;
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rq_sched_info_arrive(task_rq(t), delta);
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}
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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 = task_rq(t)->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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* Also, if the process is still in the TASK_RUNNING state, call
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* sched_info_queued() to mark that it has now again started waiting on
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* the runqueue.
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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 = task_rq(t)->clock -
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t->sched_info.last_arrival;
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rq_sched_info_depart(task_rq(t), delta);
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if (t->state == TASK_RUNNING)
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sched_info_queued(t);
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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_reset_dequeued(t) do { } while (0)
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#define sched_info_dequeued(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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/*
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* The following are functions that support scheduler-internal time accounting.
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* These functions are generally called at the timer tick. None of this depends
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* on CONFIG_SCHEDSTATS.
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*/
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/**
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* account_group_user_time - Maintain utime for a thread group.
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*
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* @tsk: Pointer to task structure.
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* @cputime: Time value by which to increment the utime field of the
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* thread_group_cputime structure.
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*
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* If thread group time is being maintained, get the structure for the
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* running CPU and update the utime field there.
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*/
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static inline void account_group_user_time(struct task_struct *tsk,
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cputime_t cputime)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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if (!cputimer->running)
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return;
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raw_spin_lock(&cputimer->lock);
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cputimer->cputime.utime += cputime;
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raw_spin_unlock(&cputimer->lock);
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}
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/**
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* account_group_system_time - Maintain stime for a thread group.
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*
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* @tsk: Pointer to task structure.
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* @cputime: Time value by which to increment the stime field of the
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* thread_group_cputime structure.
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*
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* If thread group time is being maintained, get the structure for the
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* running CPU and update the stime field there.
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*/
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static inline void account_group_system_time(struct task_struct *tsk,
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cputime_t cputime)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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if (!cputimer->running)
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return;
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raw_spin_lock(&cputimer->lock);
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cputimer->cputime.stime += cputime;
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raw_spin_unlock(&cputimer->lock);
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}
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/**
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* account_group_exec_runtime - Maintain exec runtime for a thread group.
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*
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* @tsk: Pointer to task structure.
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* @ns: Time value by which to increment the sum_exec_runtime field
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* of the thread_group_cputime structure.
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*
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* If thread group time is being maintained, get the structure for the
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* running CPU and update the sum_exec_runtime field there.
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*/
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static inline void account_group_exec_runtime(struct task_struct *tsk,
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unsigned long long ns)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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if (!cputimer->running)
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return;
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raw_spin_lock(&cputimer->lock);
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cputimer->cputime.sum_exec_runtime += ns;
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raw_spin_unlock(&cputimer->lock);
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}
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