static void probe_wakeup(struct rq *rq, struct task_struct *p, int success) { struct trace_array_cpu *data; int cpu = smp_processor_id(); unsigned long flags; long disabled; int pc; if (likely(!tracer_enabled)) return; tracing_record_cmdline(p); tracing_record_cmdline(current); if ((wakeup_rt && !rt_task(p)) || p->prio >= wakeup_prio || p->prio >= current->prio) return; pc = preempt_count(); disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); if (unlikely(disabled != 1)) goto out; /* interrupts should be off from try_to_wake_up */ __raw_spin_lock(&wakeup_lock); /* check for races. */ if (!tracer_enabled || p->prio >= wakeup_prio) goto out_locked; /* reset the trace */ __wakeup_reset(wakeup_trace); wakeup_cpu = task_cpu(p); wakeup_current_cpu = wakeup_cpu; wakeup_prio = p->prio; wakeup_task = p; get_task_struct(wakeup_task); local_save_flags(flags); data = wakeup_trace->data[wakeup_cpu]; data->preempt_timestamp = ftrace_now(cpu); tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc); /* * We must be careful in using CALLER_ADDR2. But since wake_up * is not called by an assembly function (where as schedule is) * it should be safe to use it here. */ trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc); out_locked: __raw_spin_unlock(&wakeup_lock); out: atomic_dec(&wakeup_trace->data[cpu]->disabled); }
static void wakeup_reset(struct trace_array *tr) { unsigned long flags; local_irq_save(flags); __raw_spin_lock(&wakeup_lock); __wakeup_reset(tr); __raw_spin_unlock(&wakeup_lock); local_irq_restore(flags); }
static void wakeup_reset(struct trace_array *tr) { unsigned long flags; tracing_reset_online_cpus(tr); local_irq_save(flags); arch_spin_lock(&wakeup_lock); __wakeup_reset(tr); arch_spin_unlock(&wakeup_lock); local_irq_restore(flags); }
static void probe_wakeup(struct rq *rq, struct task_struct *p, int success) { int cpu = smp_processor_id(); unsigned long flags; long disabled; int pc; if (likely(!tracer_enabled)) return; tracing_record_cmdline(p); tracing_record_cmdline(current); if (likely(!rt_task(p)) || p->prio >= wakeup_prio || p->prio >= current->prio) return; pc = preempt_count(); disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); if (unlikely(disabled != 1)) goto out; /* interrupts should be off from try_to_wake_up */ __raw_spin_lock(&wakeup_lock); /* check for races. */ if (!tracer_enabled || p->prio >= wakeup_prio) goto out_locked; /* reset the trace */ __wakeup_reset(wakeup_trace); wakeup_cpu = task_cpu(p); wakeup_prio = p->prio; wakeup_task = p; get_task_struct(wakeup_task); local_save_flags(flags); wakeup_trace->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu); trace_function(wakeup_trace, wakeup_trace->data[wakeup_cpu], CALLER_ADDR1, CALLER_ADDR2, flags, pc); out_locked: __raw_spin_unlock(&wakeup_lock); out: atomic_dec(&wakeup_trace->data[cpu]->disabled); }
static void notrace probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev, struct task_struct *next) { struct trace_array_cpu *data; cycle_t T0, T1, delta; unsigned long flags; long disabled; int cpu; int pc; tracing_record_cmdline(prev); if (unlikely(!tracer_enabled)) return; /* * When we start a new trace, we set wakeup_task to NULL * and then set tracer_enabled = 1. We want to make sure * that another CPU does not see the tracer_enabled = 1 * and the wakeup_task with an older task, that might * actually be the same as next. */ smp_rmb(); if (next != wakeup_task) return; pc = preempt_count(); /* disable local data, not wakeup_cpu data */ cpu = raw_smp_processor_id(); disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); if (likely(disabled != 1)) goto out; local_irq_save(flags); __raw_spin_lock(&wakeup_lock); /* We could race with grabbing wakeup_lock */ if (unlikely(!tracer_enabled || next != wakeup_task)) goto out_unlock; /* The task we are waiting for is waking up */ data = wakeup_trace->data[wakeup_cpu]; trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc); tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc); T0 = data->preempt_timestamp; T1 = ftrace_now(cpu); delta = T1-T0; if (!report_latency(delta)) goto out_unlock; if (likely(!is_tracing_stopped())) { tracing_max_latency = delta; update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu); } out_unlock: __wakeup_reset(wakeup_trace); __raw_spin_unlock(&wakeup_lock); local_irq_restore(flags); out: atomic_dec(&wakeup_trace->data[cpu]->disabled); }