| /* |
| * trace task wakeup timings |
| * |
| * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| * |
| * Based on code from the latency_tracer, that is: |
| * |
| * Copyright (C) 2004-2006 Ingo Molnar |
| * Copyright (C) 2004 Nadia Yvette Chambers |
| */ |
| #include <linux/module.h> |
| #include <linux/kallsyms.h> |
| #include <linux/uaccess.h> |
| #include <linux/ftrace.h> |
| #include <linux/sched/rt.h> |
| #include <linux/sched/deadline.h> |
| #include <trace/events/sched.h> |
| #include "trace.h" |
| |
| static struct trace_array *wakeup_trace; |
| static int __read_mostly tracer_enabled; |
| |
| static struct task_struct *wakeup_task; |
| static int wakeup_cpu; |
| static int wakeup_current_cpu; |
| static unsigned wakeup_prio = -1; |
| static int wakeup_rt; |
| static int wakeup_dl; |
| static int tracing_dl = 0; |
| |
| static arch_spinlock_t wakeup_lock = |
| (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
| |
| static void wakeup_reset(struct trace_array *tr); |
| static void __wakeup_reset(struct trace_array *tr); |
| |
| static int save_flags; |
| |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| static int wakeup_display_graph(struct trace_array *tr, int set); |
| # define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH) |
| #else |
| static inline int wakeup_display_graph(struct trace_array *tr, int set) |
| { |
| return 0; |
| } |
| # define is_graph(tr) false |
| #endif |
| |
| |
| #ifdef CONFIG_FUNCTION_TRACER |
| |
| static int wakeup_graph_entry(struct ftrace_graph_ent *trace); |
| static void wakeup_graph_return(struct ftrace_graph_ret *trace); |
| |
| static bool function_enabled; |
| |
| /* |
| * Prologue for the wakeup function tracers. |
| * |
| * Returns 1 if it is OK to continue, and preemption |
| * is disabled and data->disabled is incremented. |
| * 0 if the trace is to be ignored, and preemption |
| * is not disabled and data->disabled is |
| * kept the same. |
| * |
| * Note, this function is also used outside this ifdef but |
| * inside the #ifdef of the function graph tracer below. |
| * This is OK, since the function graph tracer is |
| * dependent on the function tracer. |
| */ |
| static int |
| func_prolog_preempt_disable(struct trace_array *tr, |
| struct trace_array_cpu **data, |
| int *pc) |
| { |
| long disabled; |
| int cpu; |
| |
| if (likely(!wakeup_task)) |
| return 0; |
| |
| *pc = preempt_count(); |
| preempt_disable_notrace(); |
| |
| cpu = raw_smp_processor_id(); |
| if (cpu != wakeup_current_cpu) |
| goto out_enable; |
| |
| *data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
| disabled = atomic_inc_return(&(*data)->disabled); |
| if (unlikely(disabled != 1)) |
| goto out; |
| |
| return 1; |
| |
| out: |
| atomic_dec(&(*data)->disabled); |
| |
| out_enable: |
| preempt_enable_notrace(); |
| return 0; |
| } |
| |
| /* |
| * wakeup uses its own tracer function to keep the overhead down: |
| */ |
| static void |
| wakeup_tracer_call(unsigned long ip, unsigned long parent_ip, |
| struct ftrace_ops *op, struct pt_regs *pt_regs) |
| { |
| struct trace_array *tr = wakeup_trace; |
| struct trace_array_cpu *data; |
| unsigned long flags; |
| int pc; |
| |
| if (!func_prolog_preempt_disable(tr, &data, &pc)) |
| return; |
| |
| local_irq_save(flags); |
| trace_function(tr, ip, parent_ip, flags, pc); |
| local_irq_restore(flags); |
| |
| atomic_dec(&data->disabled); |
| preempt_enable_notrace(); |
| } |
| |
| static int register_wakeup_function(struct trace_array *tr, int graph, int set) |
| { |
| int ret; |
| |
| /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */ |
| if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION))) |
| return 0; |
| |
| if (graph) |
| ret = register_ftrace_graph(&wakeup_graph_return, |
| &wakeup_graph_entry); |
| else |
| ret = register_ftrace_function(tr->ops); |
| |
| if (!ret) |
| function_enabled = true; |
| |
| return ret; |
| } |
| |
| static void unregister_wakeup_function(struct trace_array *tr, int graph) |
| { |
| if (!function_enabled) |
| return; |
| |
| if (graph) |
| unregister_ftrace_graph(); |
| else |
| unregister_ftrace_function(tr->ops); |
| |
| function_enabled = false; |
| } |
| |
| static int wakeup_function_set(struct trace_array *tr, u32 mask, int set) |
| { |
| if (!(mask & TRACE_ITER_FUNCTION)) |
| return 0; |
| |
| if (set) |
| register_wakeup_function(tr, is_graph(tr), 1); |
| else |
| unregister_wakeup_function(tr, is_graph(tr)); |
| return 1; |
| } |
| #else |
| static int register_wakeup_function(struct trace_array *tr, int graph, int set) |
| { |
| return 0; |
| } |
| static void unregister_wakeup_function(struct trace_array *tr, int graph) { } |
| static int wakeup_function_set(struct trace_array *tr, u32 mask, int set) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_FUNCTION_TRACER */ |
| |
| static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set) |
| { |
| struct tracer *tracer = tr->current_trace; |
| |
| if (wakeup_function_set(tr, mask, set)) |
| return 0; |
| |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| if (mask & TRACE_ITER_DISPLAY_GRAPH) |
| return wakeup_display_graph(tr, set); |
| #endif |
| |
| return trace_keep_overwrite(tracer, mask, set); |
| } |
| |
| static int start_func_tracer(struct trace_array *tr, int graph) |
| { |
| int ret; |
| |
| ret = register_wakeup_function(tr, graph, 0); |
| |
| if (!ret && tracing_is_enabled()) |
| tracer_enabled = 1; |
| else |
| tracer_enabled = 0; |
| |
| return ret; |
| } |
| |
| static void stop_func_tracer(struct trace_array *tr, int graph) |
| { |
| tracer_enabled = 0; |
| |
| unregister_wakeup_function(tr, graph); |
| } |
| |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| static int wakeup_display_graph(struct trace_array *tr, int set) |
| { |
| if (!(is_graph(tr) ^ set)) |
| return 0; |
| |
| stop_func_tracer(tr, !set); |
| |
| wakeup_reset(wakeup_trace); |
| tr->max_latency = 0; |
| |
| return start_func_tracer(tr, set); |
| } |
| |
| static int wakeup_graph_entry(struct ftrace_graph_ent *trace) |
| { |
| struct trace_array *tr = wakeup_trace; |
| struct trace_array_cpu *data; |
| unsigned long flags; |
| int pc, ret = 0; |
| |
| if (!func_prolog_preempt_disable(tr, &data, &pc)) |
| return 0; |
| |
| local_save_flags(flags); |
| ret = __trace_graph_entry(tr, trace, flags, pc); |
| atomic_dec(&data->disabled); |
| preempt_enable_notrace(); |
| |
| return ret; |
| } |
| |
| static void wakeup_graph_return(struct ftrace_graph_ret *trace) |
| { |
| struct trace_array *tr = wakeup_trace; |
| struct trace_array_cpu *data; |
| unsigned long flags; |
| int pc; |
| |
| if (!func_prolog_preempt_disable(tr, &data, &pc)) |
| return; |
| |
| local_save_flags(flags); |
| __trace_graph_return(tr, trace, flags, pc); |
| atomic_dec(&data->disabled); |
| |
| preempt_enable_notrace(); |
| return; |
| } |
| |
| static void wakeup_trace_open(struct trace_iterator *iter) |
| { |
| if (is_graph(iter->tr)) |
| graph_trace_open(iter); |
| } |
| |
| static void wakeup_trace_close(struct trace_iterator *iter) |
| { |
| if (iter->private) |
| graph_trace_close(iter); |
| } |
| |
| #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \ |
| TRACE_GRAPH_PRINT_ABS_TIME | \ |
| TRACE_GRAPH_PRINT_DURATION) |
| |
| static enum print_line_t wakeup_print_line(struct trace_iterator *iter) |
| { |
| /* |
| * In graph mode call the graph tracer output function, |
| * otherwise go with the TRACE_FN event handler |
| */ |
| if (is_graph(iter->tr)) |
| return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS); |
| |
| return TRACE_TYPE_UNHANDLED; |
| } |
| |
| static void wakeup_print_header(struct seq_file *s) |
| { |
| if (is_graph(wakeup_trace)) |
| print_graph_headers_flags(s, GRAPH_TRACER_FLAGS); |
| else |
| trace_default_header(s); |
| } |
| |
| static void |
| __trace_function(struct trace_array *tr, |
| unsigned long ip, unsigned long parent_ip, |
| unsigned long flags, int pc) |
| { |
| if (is_graph(tr)) |
| trace_graph_function(tr, ip, parent_ip, flags, pc); |
| else |
| trace_function(tr, ip, parent_ip, flags, pc); |
| } |
| #else |
| #define __trace_function trace_function |
| |
| static enum print_line_t wakeup_print_line(struct trace_iterator *iter) |
| { |
| return TRACE_TYPE_UNHANDLED; |
| } |
| |
| static void wakeup_trace_open(struct trace_iterator *iter) { } |
| static void wakeup_trace_close(struct trace_iterator *iter) { } |
| |
| #ifdef CONFIG_FUNCTION_TRACER |
| static int wakeup_graph_entry(struct ftrace_graph_ent *trace) |
| { |
| return -1; |
| } |
| static void wakeup_graph_return(struct ftrace_graph_ret *trace) { } |
| static void wakeup_print_header(struct seq_file *s) |
| { |
| trace_default_header(s); |
| } |
| #else |
| static void wakeup_print_header(struct seq_file *s) |
| { |
| trace_latency_header(s); |
| } |
| #endif /* CONFIG_FUNCTION_TRACER */ |
| #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| |
| /* |
| * Should this new latency be reported/recorded? |
| */ |
| static int report_latency(struct trace_array *tr, cycle_t delta) |
| { |
| if (tracing_thresh) { |
| if (delta < tracing_thresh) |
| return 0; |
| } else { |
| if (delta <= tr->max_latency) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void |
| probe_wakeup_migrate_task(void *ignore, struct task_struct *task, int cpu) |
| { |
| if (task != wakeup_task) |
| return; |
| |
| wakeup_current_cpu = cpu; |
| } |
| |
| static void |
| tracing_sched_switch_trace(struct trace_array *tr, |
| struct task_struct *prev, |
| struct task_struct *next, |
| unsigned long flags, int pc) |
| { |
| struct trace_event_call *call = &event_context_switch; |
| struct ring_buffer *buffer = tr->trace_buffer.buffer; |
| struct ring_buffer_event *event; |
| struct ctx_switch_entry *entry; |
| |
| event = trace_buffer_lock_reserve(buffer, TRACE_CTX, |
| sizeof(*entry), flags, pc); |
| if (!event) |
| return; |
| entry = ring_buffer_event_data(event); |
| entry->prev_pid = prev->pid; |
| entry->prev_prio = prev->prio; |
| entry->prev_state = prev->state; |
| entry->next_pid = next->pid; |
| entry->next_prio = next->prio; |
| entry->next_state = next->state; |
| entry->next_cpu = task_cpu(next); |
| |
| if (!call_filter_check_discard(call, entry, buffer, event)) |
| trace_buffer_unlock_commit(tr, buffer, event, flags, pc); |
| } |
| |
| static void |
| tracing_sched_wakeup_trace(struct trace_array *tr, |
| struct task_struct *wakee, |
| struct task_struct *curr, |
| unsigned long flags, int pc) |
| { |
| struct trace_event_call *call = &event_wakeup; |
| struct ring_buffer_event *event; |
| struct ctx_switch_entry *entry; |
| struct ring_buffer *buffer = tr->trace_buffer.buffer; |
| |
| event = trace_buffer_lock_reserve(buffer, TRACE_WAKE, |
| sizeof(*entry), flags, pc); |
| if (!event) |
| return; |
| entry = ring_buffer_event_data(event); |
| entry->prev_pid = curr->pid; |
| entry->prev_prio = curr->prio; |
| entry->prev_state = curr->state; |
| entry->next_pid = wakee->pid; |
| entry->next_prio = wakee->prio; |
| entry->next_state = wakee->state; |
| entry->next_cpu = task_cpu(wakee); |
| |
| if (!call_filter_check_discard(call, entry, buffer, event)) |
| trace_buffer_unlock_commit(tr, buffer, event, flags, pc); |
| } |
| |
| static void notrace |
| probe_wakeup_sched_switch(void *ignore, |
| 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(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
| if (likely(disabled != 1)) |
| goto out; |
| |
| local_irq_save(flags); |
| arch_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 = per_cpu_ptr(wakeup_trace->trace_buffer.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(wakeup_trace, delta)) |
| goto out_unlock; |
| |
| if (likely(!is_tracing_stopped())) { |
| wakeup_trace->max_latency = delta; |
| update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu); |
| } |
| |
| out_unlock: |
| __wakeup_reset(wakeup_trace); |
| arch_spin_unlock(&wakeup_lock); |
| local_irq_restore(flags); |
| out: |
| atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
| } |
| |
| static void __wakeup_reset(struct trace_array *tr) |
| { |
| wakeup_cpu = -1; |
| wakeup_prio = -1; |
| tracing_dl = 0; |
| |
| if (wakeup_task) |
| put_task_struct(wakeup_task); |
| |
| wakeup_task = NULL; |
| } |
| |
| static void wakeup_reset(struct trace_array *tr) |
| { |
| unsigned long flags; |
| |
| tracing_reset_online_cpus(&tr->trace_buffer); |
| |
| 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(void *ignore, struct task_struct *p) |
| { |
| 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); |
| |
| /* |
| * Semantic is like this: |
| * - wakeup tracer handles all tasks in the system, independently |
| * from their scheduling class; |
| * - wakeup_rt tracer handles tasks belonging to sched_dl and |
| * sched_rt class; |
| * - wakeup_dl handles tasks belonging to sched_dl class only. |
| */ |
| if (tracing_dl || (wakeup_dl && !dl_task(p)) || |
| (wakeup_rt && !dl_task(p) && !rt_task(p)) || |
| (!dl_task(p) && (p->prio >= wakeup_prio || p->prio >= current->prio))) |
| return; |
| |
| pc = preempt_count(); |
| disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
| if (unlikely(disabled != 1)) |
| goto out; |
| |
| /* interrupts should be off from try_to_wake_up */ |
| arch_spin_lock(&wakeup_lock); |
| |
| /* check for races. */ |
| if (!tracer_enabled || tracing_dl || |
| (!dl_task(p) && 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; |
| |
| /* |
| * Once you start tracing a -deadline task, don't bother tracing |
| * another task until the first one wakes up. |
| */ |
| if (dl_task(p)) |
| tracing_dl = 1; |
| else |
| tracing_dl = 0; |
| |
| wakeup_task = p; |
| get_task_struct(wakeup_task); |
| |
| local_save_flags(flags); |
| |
| data = per_cpu_ptr(wakeup_trace->trace_buffer.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: |
| arch_spin_unlock(&wakeup_lock); |
| out: |
| atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled); |
| } |
| |
| static void start_wakeup_tracer(struct trace_array *tr) |
| { |
| int ret; |
| |
| ret = register_trace_sched_wakeup(probe_wakeup, NULL); |
| if (ret) { |
| pr_info("wakeup trace: Couldn't activate tracepoint" |
| " probe to kernel_sched_wakeup\n"); |
| return; |
| } |
| |
| ret = register_trace_sched_wakeup_new(probe_wakeup, NULL); |
| if (ret) { |
| pr_info("wakeup trace: Couldn't activate tracepoint" |
| " probe to kernel_sched_wakeup_new\n"); |
| goto fail_deprobe; |
| } |
| |
| ret = register_trace_sched_switch(probe_wakeup_sched_switch, NULL); |
| if (ret) { |
| pr_info("sched trace: Couldn't activate tracepoint" |
| " probe to kernel_sched_switch\n"); |
| goto fail_deprobe_wake_new; |
| } |
| |
| ret = register_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); |
| if (ret) { |
| pr_info("wakeup trace: Couldn't activate tracepoint" |
| " probe to kernel_sched_migrate_task\n"); |
| return; |
| } |
| |
| wakeup_reset(tr); |
| |
| /* |
| * Don't let the tracer_enabled = 1 show up before |
| * the wakeup_task is reset. This may be overkill since |
| * wakeup_reset does a spin_unlock after setting the |
| * wakeup_task to NULL, but I want to be safe. |
| * This is a slow path anyway. |
| */ |
| smp_wmb(); |
| |
| if (start_func_tracer(tr, is_graph(tr))) |
| printk(KERN_ERR "failed to start wakeup tracer\n"); |
| |
| return; |
| fail_deprobe_wake_new: |
| unregister_trace_sched_wakeup_new(probe_wakeup, NULL); |
| fail_deprobe: |
| unregister_trace_sched_wakeup(probe_wakeup, NULL); |
| } |
| |
| static void stop_wakeup_tracer(struct trace_array *tr) |
| { |
| tracer_enabled = 0; |
| stop_func_tracer(tr, is_graph(tr)); |
| unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL); |
| unregister_trace_sched_wakeup_new(probe_wakeup, NULL); |
| unregister_trace_sched_wakeup(probe_wakeup, NULL); |
| unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); |
| } |
| |
| static bool wakeup_busy; |
| |
| static int __wakeup_tracer_init(struct trace_array *tr) |
| { |
| save_flags = tr->trace_flags; |
| |
| /* non overwrite screws up the latency tracers */ |
| set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); |
| set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1); |
| |
| tr->max_latency = 0; |
| wakeup_trace = tr; |
| ftrace_init_array_ops(tr, wakeup_tracer_call); |
| start_wakeup_tracer(tr); |
| |
| wakeup_busy = true; |
| return 0; |
| } |
| |
| static int wakeup_tracer_init(struct trace_array *tr) |
| { |
| if (wakeup_busy) |
| return -EBUSY; |
| |
| wakeup_dl = 0; |
| wakeup_rt = 0; |
| return __wakeup_tracer_init(tr); |
| } |
| |
| static int wakeup_rt_tracer_init(struct trace_array *tr) |
| { |
| if (wakeup_busy) |
| return -EBUSY; |
| |
| wakeup_dl = 0; |
| wakeup_rt = 1; |
| return __wakeup_tracer_init(tr); |
| } |
| |
| static int wakeup_dl_tracer_init(struct trace_array *tr) |
| { |
| if (wakeup_busy) |
| return -EBUSY; |
| |
| wakeup_dl = 1; |
| wakeup_rt = 0; |
| return __wakeup_tracer_init(tr); |
| } |
| |
| static void wakeup_tracer_reset(struct trace_array *tr) |
| { |
| int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT; |
| int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE; |
| |
| stop_wakeup_tracer(tr); |
| /* make sure we put back any tasks we are tracing */ |
| wakeup_reset(tr); |
| |
| set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag); |
| set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag); |
| ftrace_reset_array_ops(tr); |
| wakeup_busy = false; |
| } |
| |
| static void wakeup_tracer_start(struct trace_array *tr) |
| { |
| wakeup_reset(tr); |
| tracer_enabled = 1; |
| } |
| |
| static void wakeup_tracer_stop(struct trace_array *tr) |
| { |
| tracer_enabled = 0; |
| } |
| |
| static struct tracer wakeup_tracer __read_mostly = |
| { |
| .name = "wakeup", |
| .init = wakeup_tracer_init, |
| .reset = wakeup_tracer_reset, |
| .start = wakeup_tracer_start, |
| .stop = wakeup_tracer_stop, |
| .print_max = true, |
| .print_header = wakeup_print_header, |
| .print_line = wakeup_print_line, |
| .flag_changed = wakeup_flag_changed, |
| #ifdef CONFIG_FTRACE_SELFTEST |
| .selftest = trace_selftest_startup_wakeup, |
| #endif |
| .open = wakeup_trace_open, |
| .close = wakeup_trace_close, |
| .allow_instances = true, |
| .use_max_tr = true, |
| }; |
| |
| static struct tracer wakeup_rt_tracer __read_mostly = |
| { |
| .name = "wakeup_rt", |
| .init = wakeup_rt_tracer_init, |
| .reset = wakeup_tracer_reset, |
| .start = wakeup_tracer_start, |
| .stop = wakeup_tracer_stop, |
| .print_max = true, |
| .print_header = wakeup_print_header, |
| .print_line = wakeup_print_line, |
| .flag_changed = wakeup_flag_changed, |
| #ifdef CONFIG_FTRACE_SELFTEST |
| .selftest = trace_selftest_startup_wakeup, |
| #endif |
| .open = wakeup_trace_open, |
| .close = wakeup_trace_close, |
| .allow_instances = true, |
| .use_max_tr = true, |
| }; |
| |
| static struct tracer wakeup_dl_tracer __read_mostly = |
| { |
| .name = "wakeup_dl", |
| .init = wakeup_dl_tracer_init, |
| .reset = wakeup_tracer_reset, |
| .start = wakeup_tracer_start, |
| .stop = wakeup_tracer_stop, |
| .print_max = true, |
| .print_header = wakeup_print_header, |
| .print_line = wakeup_print_line, |
| .flag_changed = wakeup_flag_changed, |
| #ifdef CONFIG_FTRACE_SELFTEST |
| .selftest = trace_selftest_startup_wakeup, |
| #endif |
| .open = wakeup_trace_open, |
| .close = wakeup_trace_close, |
| .use_max_tr = true, |
| }; |
| |
| __init static int init_wakeup_tracer(void) |
| { |
| int ret; |
| |
| ret = register_tracer(&wakeup_tracer); |
| if (ret) |
| return ret; |
| |
| ret = register_tracer(&wakeup_rt_tracer); |
| if (ret) |
| return ret; |
| |
| ret = register_tracer(&wakeup_dl_tracer); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| core_initcall(init_wakeup_tracer); |