// SPDX-License-Identifier: GPL-2.0
|
/*
|
* 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 start_func_tracer(struct trace_array *tr, int graph);
|
static void stop_func_tracer(struct trace_array *tr, int graph);
|
|
static int save_flags;
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
|
#else
|
# define is_graph(tr) false
|
#endif
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
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,
|
unsigned int *trace_ctx)
|
{
|
long disabled;
|
int cpu;
|
|
if (likely(!wakeup_task))
|
return 0;
|
|
*trace_ctx = tracing_gen_ctx();
|
preempt_disable_notrace();
|
|
cpu = raw_smp_processor_id();
|
if (cpu != wakeup_current_cpu)
|
goto out_enable;
|
|
*data = per_cpu_ptr(tr->array_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;
|
}
|
|
#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 int trace_ctx;
|
int ret = 0;
|
|
if (ftrace_graph_ignore_func(trace))
|
return 0;
|
/*
|
* Do not trace a function if it's filtered by set_graph_notrace.
|
* Make the index of ret stack negative to indicate that it should
|
* ignore further functions. But it needs its own ret stack entry
|
* to recover the original index in order to continue tracing after
|
* returning from the function.
|
*/
|
if (ftrace_graph_notrace_addr(trace->func))
|
return 1;
|
|
if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
|
return 0;
|
|
ret = __trace_graph_entry(tr, trace, trace_ctx);
|
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 int trace_ctx;
|
|
ftrace_graph_addr_finish(trace);
|
|
if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
|
return;
|
|
__trace_graph_return(tr, trace, trace_ctx);
|
atomic_dec(&data->disabled);
|
|
preempt_enable_notrace();
|
return;
|
}
|
|
static struct fgraph_ops fgraph_wakeup_ops = {
|
.entryfunc = &wakeup_graph_entry,
|
.retfunc = &wakeup_graph_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_CPU | \
|
TRACE_GRAPH_PRINT_REL_TIME | \
|
TRACE_GRAPH_PRINT_DURATION | \
|
TRACE_GRAPH_PRINT_OVERHEAD | \
|
TRACE_GRAPH_PRINT_IRQS)
|
|
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);
|
}
|
#endif /* else CONFIG_FUNCTION_GRAPH_TRACER */
|
|
/*
|
* 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;
|
unsigned int trace_ctx;
|
|
if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
|
return;
|
|
local_irq_save(flags);
|
trace_function(tr, ip, parent_ip, trace_ctx);
|
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(&fgraph_wakeup_ops);
|
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(&fgraph_wakeup_ops);
|
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 /* CONFIG_FUNCTION_TRACER */
|
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 /* else CONFIG_FUNCTION_TRACER */
|
|
#ifndef CONFIG_FUNCTION_GRAPH_TRACER
|
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) { }
|
|
static void wakeup_print_header(struct seq_file *s)
|
{
|
trace_default_header(s);
|
}
|
#endif /* !CONFIG_FUNCTION_GRAPH_TRACER */
|
|
static void
|
__trace_function(struct trace_array *tr,
|
unsigned long ip, unsigned long parent_ip,
|
unsigned int trace_ctx)
|
{
|
if (is_graph(tr))
|
trace_graph_function(tr, ip, parent_ip, trace_ctx);
|
else
|
trace_function(tr, ip, parent_ip, trace_ctx);
|
}
|
|
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);
|
}
|
|
/*
|
* Should this new latency be reported/recorded?
|
*/
|
static bool report_latency(struct trace_array *tr, u64 delta)
|
{
|
if (tracing_thresh) {
|
if (delta < tracing_thresh)
|
return false;
|
} else {
|
if (delta <= tr->max_latency)
|
return false;
|
}
|
return true;
|
}
|
|
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 int trace_ctx)
|
{
|
struct trace_event_call *call = &event_context_switch;
|
struct trace_buffer *buffer = tr->array_buffer.buffer;
|
struct ring_buffer_event *event;
|
struct ctx_switch_entry *entry;
|
|
event = trace_buffer_lock_reserve(buffer, TRACE_CTX,
|
sizeof(*entry), trace_ctx);
|
if (!event)
|
return;
|
entry = ring_buffer_event_data(event);
|
entry->prev_pid = prev->pid;
|
entry->prev_prio = prev->prio;
|
entry->prev_state = task_state_index(prev);
|
entry->next_pid = next->pid;
|
entry->next_prio = next->prio;
|
entry->next_state = task_state_index(next);
|
entry->next_cpu = task_cpu(next);
|
|
if (!call_filter_check_discard(call, entry, buffer, event))
|
trace_buffer_unlock_commit(tr, buffer, event, trace_ctx);
|
}
|
|
static void
|
tracing_sched_wakeup_trace(struct trace_array *tr,
|
struct task_struct *wakee,
|
struct task_struct *curr,
|
unsigned int trace_ctx)
|
{
|
struct trace_event_call *call = &event_wakeup;
|
struct ring_buffer_event *event;
|
struct ctx_switch_entry *entry;
|
struct trace_buffer *buffer = tr->array_buffer.buffer;
|
|
event = trace_buffer_lock_reserve(buffer, TRACE_WAKE,
|
sizeof(*entry), trace_ctx);
|
if (!event)
|
return;
|
entry = ring_buffer_event_data(event);
|
entry->prev_pid = curr->pid;
|
entry->prev_prio = curr->prio;
|
entry->prev_state = task_state_index(curr);
|
entry->next_pid = wakee->pid;
|
entry->next_prio = wakee->prio;
|
entry->next_state = task_state_index(wakee);
|
entry->next_cpu = task_cpu(wakee);
|
|
if (!call_filter_check_discard(call, entry, buffer, event))
|
trace_buffer_unlock_commit(tr, buffer, event, trace_ctx);
|
}
|
|
static void notrace
|
probe_wakeup_sched_switch(void *ignore, bool preempt,
|
struct task_struct *prev, struct task_struct *next)
|
{
|
struct trace_array_cpu *data;
|
u64 T0, T1, delta;
|
unsigned long flags;
|
long disabled;
|
int cpu;
|
unsigned int trace_ctx;
|
|
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;
|
|
/* disable local data, not wakeup_cpu data */
|
cpu = raw_smp_processor_id();
|
disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->array_buffer.data, cpu)->disabled);
|
if (likely(disabled != 1))
|
goto out;
|
|
local_irq_save(flags);
|
trace_ctx = tracing_gen_ctx_flags(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->array_buffer.data, wakeup_cpu);
|
|
__trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, trace_ctx);
|
tracing_sched_switch_trace(wakeup_trace, prev, next, trace_ctx);
|
__trace_stack(wakeup_trace, trace_ctx, 0);
|
|
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, NULL);
|
}
|
|
out_unlock:
|
__wakeup_reset(wakeup_trace);
|
arch_spin_unlock(&wakeup_lock);
|
local_irq_restore(flags);
|
out:
|
atomic_dec(&per_cpu_ptr(wakeup_trace->array_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->array_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();
|
long disabled;
|
unsigned int trace_ctx;
|
|
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;
|
|
disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->array_buffer.data, cpu)->disabled);
|
if (unlikely(disabled != 1))
|
goto out;
|
|
trace_ctx = tracing_gen_ctx();
|
|
/* 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 = get_task_struct(p);
|
|
data = per_cpu_ptr(wakeup_trace->array_buffer.data, wakeup_cpu);
|
data->preempt_timestamp = ftrace_now(cpu);
|
tracing_sched_wakeup_trace(wakeup_trace, p, current, trace_ctx);
|
__trace_stack(wakeup_trace, trace_ctx, 0);
|
|
/*
|
* 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, trace_ctx);
|
|
out_locked:
|
arch_spin_unlock(&wakeup_lock);
|
out:
|
atomic_dec(&per_cpu_ptr(wakeup_trace->array_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");
|
goto fail_deprobe_sched_switch;
|
}
|
|
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_sched_switch:
|
unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
|
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;
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static int __wakeup_tracer_init(struct trace_array *tr)
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{
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save_flags = tr->trace_flags;
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/* non overwrite screws up the latency tracers */
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set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
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set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1);
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tr->max_latency = 0;
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wakeup_trace = tr;
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ftrace_init_array_ops(tr, wakeup_tracer_call);
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start_wakeup_tracer(tr);
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wakeup_busy = true;
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return 0;
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}
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static int wakeup_tracer_init(struct trace_array *tr)
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{
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if (wakeup_busy)
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return -EBUSY;
|
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wakeup_dl = 0;
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wakeup_rt = 0;
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return __wakeup_tracer_init(tr);
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}
|
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static int wakeup_rt_tracer_init(struct trace_array *tr)
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{
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if (wakeup_busy)
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return -EBUSY;
|
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wakeup_dl = 0;
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wakeup_rt = 1;
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return __wakeup_tracer_init(tr);
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}
|
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static int wakeup_dl_tracer_init(struct trace_array *tr)
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{
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if (wakeup_busy)
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return -EBUSY;
|
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wakeup_dl = 1;
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wakeup_rt = 0;
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return __wakeup_tracer_init(tr);
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}
|
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static void wakeup_tracer_reset(struct trace_array *tr)
|
{
|
int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
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int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;
|
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stop_wakeup_tracer(tr);
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/* make sure we put back any tasks we are tracing */
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wakeup_reset(tr);
|
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set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
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set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
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ftrace_reset_array_ops(tr);
|
wakeup_busy = false;
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}
|
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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",
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.init = wakeup_tracer_init,
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.reset = wakeup_tracer_reset,
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.start = wakeup_tracer_start,
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.stop = wakeup_tracer_stop,
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.print_max = true,
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.print_header = wakeup_print_header,
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.print_line = wakeup_print_line,
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.flag_changed = wakeup_flag_changed,
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#ifdef CONFIG_FTRACE_SELFTEST
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.selftest = trace_selftest_startup_wakeup,
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#endif
|
.open = wakeup_trace_open,
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.close = wakeup_trace_close,
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.allow_instances = true,
|
.use_max_tr = true,
|
};
|
|
static struct tracer wakeup_rt_tracer __read_mostly =
|
{
|
.name = "wakeup_rt",
|
.init = wakeup_rt_tracer_init,
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.reset = wakeup_tracer_reset,
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.start = wakeup_tracer_start,
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.stop = wakeup_tracer_stop,
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.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,
|
.allow_instances = true,
|
.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);
|
