/*
- * trace irqs off criticall timings
+ * trace irqs off critical timings
*
* Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
* Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
static int trace_type __read_mostly;
+static int save_lat_flag;
+
#ifdef CONFIG_PREEMPT_TRACER
static inline int
preempt_trace(void)
*/
static __cacheline_aligned_in_smp unsigned long max_sequence;
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
/*
* irqsoff uses its own tracer function to keep the overhead down:
*/
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, ip, parent_ip, flags, preempt_count());
atomic_dec(&data->disabled);
}
{
.func = irqsoff_tracer_call,
};
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
/*
* Should this new latency be reported/recorded?
unsigned long parent_ip,
int cpu)
{
- unsigned long latency, t0, t1;
cycle_t T0, T1, delta;
unsigned long flags;
+ int pc;
- /*
- * usecs conversion is slow so we try to delay the conversion
- * as long as possible:
- */
T0 = data->preempt_timestamp;
T1 = ftrace_now(cpu);
delta = T1-T0;
local_save_flags(flags);
+ pc = preempt_count();
+
if (!report_latency(delta))
goto out;
if (!report_latency(delta))
goto out_unlock;
- trace_function(tr, data, CALLER_ADDR0, parent_ip, flags);
-
- latency = nsecs_to_usecs(delta);
+ trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
+ /* Skip 5 functions to get to the irq/preempt enable function */
+ __trace_stack(tr, flags, 5, pc);
if (data->critical_sequence != max_sequence)
goto out_unlock;
- tracing_max_latency = delta;
- t0 = nsecs_to_usecs(T0);
- t1 = nsecs_to_usecs(T1);
-
data->critical_end = parent_ip;
- update_max_tr_single(tr, current, cpu);
-
- if (!runqueue_is_locked()) {
- if (tracing_thresh) {
- printk(KERN_INFO "(%16s-%-5d|#%d): %lu us critical"
- " section violates %lu us threshold.\n",
- current->comm, current->pid,
- raw_smp_processor_id(),
- latency, nsecs_to_usecs(tracing_thresh));
- } else {
- printk(KERN_INFO "(%16s-%-5d|#%d): new %lu us"
- " maximum-latency critical section.\n",
- current->comm, current->pid,
- raw_smp_processor_id(),
- latency);
- }
+ if (likely(!is_tracing_stopped())) {
+ tracing_max_latency = delta;
+ update_max_tr_single(tr, current, cpu);
}
max_sequence++;
out:
data->critical_sequence = max_sequence;
data->preempt_timestamp = ftrace_now(cpu);
- tracing_reset(data);
- trace_function(tr, data, CALLER_ADDR0, parent_ip, flags);
+ trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
}
static inline void
if (likely(!tracer_enabled))
return;
- if (__get_cpu_var(tracing_cpu))
+ cpu = raw_smp_processor_id();
+
+ if (per_cpu(tracing_cpu, cpu))
return;
- cpu = raw_smp_processor_id();
data = tr->data[cpu];
- if (unlikely(!data) || unlikely(!head_page(data)) ||
- atomic_read(&data->disabled))
+ if (unlikely(!data) || atomic_read(&data->disabled))
return;
atomic_inc(&data->disabled);
data->critical_sequence = max_sequence;
data->preempt_timestamp = ftrace_now(cpu);
data->critical_start = parent_ip ? : ip;
- tracing_reset(data);
local_save_flags(flags);
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, ip, parent_ip, flags, preempt_count());
- __get_cpu_var(tracing_cpu) = 1;
+ per_cpu(tracing_cpu, cpu) = 1;
atomic_dec(&data->disabled);
}
struct trace_array_cpu *data;
unsigned long flags;
+ cpu = raw_smp_processor_id();
/* Always clear the tracing cpu on stopping the trace */
- if (unlikely(__get_cpu_var(tracing_cpu)))
- __get_cpu_var(tracing_cpu) = 0;
+ if (unlikely(per_cpu(tracing_cpu, cpu)))
+ per_cpu(tracing_cpu, cpu) = 0;
else
return;
if (!tracer_enabled)
return;
- cpu = raw_smp_processor_id();
data = tr->data[cpu];
- if (unlikely(!data) || unlikely(!head_page(data)) ||
+ if (unlikely(!data) ||
!data->critical_start || atomic_read(&data->disabled))
return;
atomic_inc(&data->disabled);
+
local_save_flags(flags);
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, ip, parent_ip, flags, preempt_count());
check_critical_timing(tr, data, parent_ip ? : ip, cpu);
data->critical_start = 0;
atomic_dec(&data->disabled);
if (preempt_trace() || irq_trace())
start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
}
+EXPORT_SYMBOL_GPL(start_critical_timings);
void stop_critical_timings(void)
{
if (preempt_trace() || irq_trace())
stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
}
+EXPORT_SYMBOL_GPL(stop_critical_timings);
#ifdef CONFIG_IRQSOFF_TRACER
#ifdef CONFIG_PROVE_LOCKING
#ifdef CONFIG_PREEMPT_TRACER
void trace_preempt_on(unsigned long a0, unsigned long a1)
{
- stop_critical_timing(a0, a1);
+ if (preempt_trace())
+ stop_critical_timing(a0, a1);
}
void trace_preempt_off(unsigned long a0, unsigned long a1)
{
- start_critical_timing(a0, a1);
+ if (preempt_trace())
+ start_critical_timing(a0, a1);
}
#endif /* CONFIG_PREEMPT_TRACER */
static void start_irqsoff_tracer(struct trace_array *tr)
{
register_ftrace_function(&trace_ops);
- tracer_enabled = 1;
+ if (tracing_is_enabled())
+ tracer_enabled = 1;
+ else
+ tracer_enabled = 0;
}
static void stop_irqsoff_tracer(struct trace_array *tr)
static void __irqsoff_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;
irqsoff_trace = tr;
- /* make sure that the tracer is visibel */
+ /* make sure that the tracer is visible */
smp_wmb();
-
- if (tr->ctrl)
- start_irqsoff_tracer(tr);
+ tracing_reset_online_cpus(tr);
+ start_irqsoff_tracer(tr);
}
static void irqsoff_tracer_reset(struct trace_array *tr)
{
- if (tr->ctrl)
- stop_irqsoff_tracer(tr);
-}
+ stop_irqsoff_tracer(tr);
-static void irqsoff_tracer_ctrl_update(struct trace_array *tr)
-{
- if (tr->ctrl)
- start_irqsoff_tracer(tr);
- else
- stop_irqsoff_tracer(tr);
+ if (!save_lat_flag)
+ trace_flags &= ~TRACE_ITER_LATENCY_FMT;
}
-static void irqsoff_tracer_open(struct trace_iterator *iter)
+static void irqsoff_tracer_start(struct trace_array *tr)
{
- /* stop the trace while dumping */
- if (iter->tr->ctrl)
- stop_irqsoff_tracer(iter->tr);
+ tracer_enabled = 1;
}
-static void irqsoff_tracer_close(struct trace_iterator *iter)
+static void irqsoff_tracer_stop(struct trace_array *tr)
{
- if (iter->tr->ctrl)
- start_irqsoff_tracer(iter->tr);
+ tracer_enabled = 0;
}
#ifdef CONFIG_IRQSOFF_TRACER
-static void irqsoff_tracer_init(struct trace_array *tr)
+static int irqsoff_tracer_init(struct trace_array *tr)
{
trace_type = TRACER_IRQS_OFF;
__irqsoff_tracer_init(tr);
+ return 0;
}
static struct tracer irqsoff_tracer __read_mostly =
{
.name = "irqsoff",
.init = irqsoff_tracer_init,
.reset = irqsoff_tracer_reset,
- .open = irqsoff_tracer_open,
- .close = irqsoff_tracer_close,
- .ctrl_update = irqsoff_tracer_ctrl_update,
+ .start = irqsoff_tracer_start,
+ .stop = irqsoff_tracer_stop,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_irqsoff,
#endif
#ifdef CONFIG_PREEMPT_TRACER
-static void preemptoff_tracer_init(struct trace_array *tr)
+static int preemptoff_tracer_init(struct trace_array *tr)
{
trace_type = TRACER_PREEMPT_OFF;
__irqsoff_tracer_init(tr);
+ return 0;
}
static struct tracer preemptoff_tracer __read_mostly =
.name = "preemptoff",
.init = preemptoff_tracer_init,
.reset = irqsoff_tracer_reset,
- .open = irqsoff_tracer_open,
- .close = irqsoff_tracer_close,
- .ctrl_update = irqsoff_tracer_ctrl_update,
+ .start = irqsoff_tracer_start,
+ .stop = irqsoff_tracer_stop,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_preemptoff,
#if defined(CONFIG_IRQSOFF_TRACER) && \
defined(CONFIG_PREEMPT_TRACER)
-static void preemptirqsoff_tracer_init(struct trace_array *tr)
+static int preemptirqsoff_tracer_init(struct trace_array *tr)
{
trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF;
__irqsoff_tracer_init(tr);
+ return 0;
}
static struct tracer preemptirqsoff_tracer __read_mostly =
.name = "preemptirqsoff",
.init = preemptirqsoff_tracer_init,
.reset = irqsoff_tracer_reset,
- .open = irqsoff_tracer_open,
- .close = irqsoff_tracer_close,
- .ctrl_update = irqsoff_tracer_ctrl_update,
+ .start = irqsoff_tracer_start,
+ .stop = irqsoff_tracer_stop,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_preemptirqsoff,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff