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path: root/kernel/trace/trace_sched_wakeup.c
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Diffstat (limited to 'kernel/trace/trace_sched_wakeup.c')
-rw-r--r--kernel/trace/trace_sched_wakeup.c102
1 files changed, 59 insertions, 43 deletions
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 42ae1e77b6b..5bc00e8f153 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -25,12 +25,15 @@ static int __read_mostly tracer_enabled;
static struct task_struct *wakeup_task;
static int wakeup_cpu;
static unsigned wakeup_prio = -1;
+static int wakeup_rt;
static raw_spinlock_t wakeup_lock =
(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
static void __wakeup_reset(struct trace_array *tr);
+static int save_lat_flag;
+
#ifdef CONFIG_FUNCTION_TRACER
/*
* irqsoff uses its own tracer function to keep the overhead down:
@@ -71,7 +74,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
if (task_cpu(wakeup_task) != cpu)
goto unlock;
- trace_function(tr, data, ip, parent_ip, flags, pc);
+ trace_function(tr, ip, parent_ip, flags, pc);
unlock:
__raw_spin_unlock(&wakeup_lock);
@@ -151,7 +154,8 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
if (unlikely(!tracer_enabled || next != wakeup_task))
goto out_unlock;
- trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
+ trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
+ tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
/*
* usecs conversion is slow so we try to delay the conversion
@@ -182,13 +186,10 @@ out:
static void __wakeup_reset(struct trace_array *tr)
{
- struct trace_array_cpu *data;
int cpu;
- for_each_possible_cpu(cpu) {
- data = tr->data[cpu];
+ for_each_possible_cpu(cpu)
tracing_reset(tr, cpu);
- }
wakeup_cpu = -1;
wakeup_prio = -1;
@@ -213,6 +214,7 @@ static void wakeup_reset(struct trace_array *tr)
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;
@@ -224,7 +226,7 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
tracing_record_cmdline(p);
tracing_record_cmdline(current);
- if (likely(!rt_task(p)) ||
+ if ((wakeup_rt && !rt_task(p)) ||
p->prio >= wakeup_prio ||
p->prio >= current->prio)
return;
@@ -252,9 +254,16 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
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);
+ 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);
@@ -262,12 +271,6 @@ out:
atomic_dec(&wakeup_trace->data[cpu]->disabled);
}
-/*
- * save_tracer_enabled is used to save the state of the tracer_enabled
- * variable when we disable it when we open a trace output file.
- */
-static int save_tracer_enabled;
-
static void start_wakeup_tracer(struct trace_array *tr)
{
int ret;
@@ -289,7 +292,7 @@ static void start_wakeup_tracer(struct trace_array *tr)
ret = register_trace_sched_switch(probe_wakeup_sched_switch);
if (ret) {
pr_info("sched trace: Couldn't activate tracepoint"
- " probe to kernel_sched_schedule\n");
+ " probe to kernel_sched_switch\n");
goto fail_deprobe_wake_new;
}
@@ -306,13 +309,10 @@ static void start_wakeup_tracer(struct trace_array *tr)
register_ftrace_function(&trace_ops);
- if (tracing_is_enabled()) {
+ if (tracing_is_enabled())
tracer_enabled = 1;
- save_tracer_enabled = 1;
- } else {
+ else
tracer_enabled = 0;
- save_tracer_enabled = 0;
- }
return;
fail_deprobe_wake_new:
@@ -324,54 +324,54 @@ fail_deprobe:
static void stop_wakeup_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
- save_tracer_enabled = 0;
unregister_ftrace_function(&trace_ops);
unregister_trace_sched_switch(probe_wakeup_sched_switch);
unregister_trace_sched_wakeup_new(probe_wakeup);
unregister_trace_sched_wakeup(probe_wakeup);
}
-static int wakeup_tracer_init(struct trace_array *tr)
+static int __wakeup_tracer_init(struct trace_array *tr)
{
+ save_lat_flag = trace_flags & TRACE_ITER_LATENCY_FMT;
+ trace_flags |= TRACE_ITER_LATENCY_FMT;
+
tracing_max_latency = 0;
wakeup_trace = tr;
start_wakeup_tracer(tr);
return 0;
}
+static int wakeup_tracer_init(struct trace_array *tr)
+{
+ wakeup_rt = 0;
+ return __wakeup_tracer_init(tr);
+}
+
+static int wakeup_rt_tracer_init(struct trace_array *tr)
+{
+ wakeup_rt = 1;
+ return __wakeup_tracer_init(tr);
+}
+
static void wakeup_tracer_reset(struct trace_array *tr)
{
stop_wakeup_tracer(tr);
/* make sure we put back any tasks we are tracing */
wakeup_reset(tr);
+
+ if (!save_lat_flag)
+ trace_flags &= ~TRACE_ITER_LATENCY_FMT;
}
static void wakeup_tracer_start(struct trace_array *tr)
{
wakeup_reset(tr);
tracer_enabled = 1;
- save_tracer_enabled = 1;
}
static void wakeup_tracer_stop(struct trace_array *tr)
{
tracer_enabled = 0;
- save_tracer_enabled = 0;
-}
-
-static void wakeup_tracer_open(struct trace_iterator *iter)
-{
- /* stop the trace while dumping */
- tracer_enabled = 0;
-}
-
-static void wakeup_tracer_close(struct trace_iterator *iter)
-{
- /* forget about any processes we were recording */
- if (save_tracer_enabled) {
- wakeup_reset(iter->tr);
- tracer_enabled = 1;
- }
}
static struct tracer wakeup_tracer __read_mostly =
@@ -381,8 +381,20 @@ static struct tracer wakeup_tracer __read_mostly =
.reset = wakeup_tracer_reset,
.start = wakeup_tracer_start,
.stop = wakeup_tracer_stop,
- .open = wakeup_tracer_open,
- .close = wakeup_tracer_close,
+ .print_max = 1,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_wakeup,
+#endif
+};
+
+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,
+ .wait_pipe = poll_wait_pipe,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_wakeup,
@@ -397,6 +409,10 @@ __init static int init_wakeup_tracer(void)
if (ret)
return ret;
+ ret = register_tracer(&wakeup_rt_tracer);
+ if (ret)
+ return ret;
+
return 0;
}
device_initcall(init_wakeup_tracer);