}
EXPORT_SYMBOL_GPL(call_filter_check_discard);
-cycle_t buffer_ftrace_now(struct trace_buffer *buf, int cpu)
+static cycle_t buffer_ftrace_now(struct trace_buffer *buf, int cpu)
{
u64 ts;
return 0;
}
-void free_snapshot(struct trace_array *tr)
+static void free_snapshot(struct trace_array *tr)
{
/*
* We don't free the ring buffer. instead, resize it because
return cnt;
}
-/*
- * ftrace_max_lock is used to protect the swapping of buffers
- * when taking a max snapshot. The buffers themselves are
- * protected by per_cpu spinlocks. But the action of the swap
- * needs its own lock.
- *
- * This is defined as a arch_spinlock_t in order to help
- * with performance when lockdep debugging is enabled.
- *
- * It is also used in other places outside the update_max_tr
- * so it needs to be defined outside of the
- * CONFIG_TRACER_MAX_TRACE.
- */
-static arch_spinlock_t ftrace_max_lock =
- (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
-
unsigned long __read_mostly tracing_thresh;
#ifdef CONFIG_TRACER_MAX_TRACE
-unsigned long __read_mostly tracing_max_latency;
-
/*
* Copy the new maximum trace into the separate maximum-trace
* structure. (this way the maximum trace is permanently saved,
max_buf->cpu = cpu;
max_buf->time_start = data->preempt_timestamp;
- max_data->saved_latency = tracing_max_latency;
+ max_data->saved_latency = tr->max_latency;
max_data->critical_start = data->critical_start;
max_data->critical_end = data->critical_end;
return;
}
- arch_spin_lock(&ftrace_max_lock);
+ arch_spin_lock(&tr->max_lock);
buf = tr->trace_buffer.buffer;
tr->trace_buffer.buffer = tr->max_buffer.buffer;
tr->max_buffer.buffer = buf;
__update_max_tr(tr, tsk, cpu);
- arch_spin_unlock(&ftrace_max_lock);
+ arch_spin_unlock(&tr->max_lock);
}
/**
return;
}
- arch_spin_lock(&ftrace_max_lock);
+ arch_spin_lock(&tr->max_lock);
ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu);
WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY);
__update_max_tr(tr, tsk, cpu);
- arch_spin_unlock(&ftrace_max_lock);
+ arch_spin_unlock(&tr->max_lock);
}
#endif /* CONFIG_TRACER_MAX_TRACE */
-static void default_wait_pipe(struct trace_iterator *iter)
+static void wait_on_pipe(struct trace_iterator *iter)
{
/* Iterators are static, they should be filled or empty */
if (trace_buffer_iter(iter, iter->cpu_file))
else
if (!type->flags->opts)
type->flags->opts = dummy_tracer_opt;
- if (!type->wait_pipe)
- type->wait_pipe = default_wait_pipe;
ret = run_tracer_selftest(type);
if (ret < 0)
}
/* Prevent the buffers from switching */
- arch_spin_lock(&ftrace_max_lock);
+ arch_spin_lock(&global_trace.max_lock);
buffer = global_trace.trace_buffer.buffer;
if (buffer)
ring_buffer_record_enable(buffer);
#endif
- arch_spin_unlock(&ftrace_max_lock);
+ arch_spin_unlock(&global_trace.max_lock);
ftrace_start();
out:
goto out;
/* Prevent the buffers from switching */
- arch_spin_lock(&ftrace_max_lock);
+ arch_spin_lock(&global_trace.max_lock);
buffer = global_trace.trace_buffer.buffer;
if (buffer)
ring_buffer_record_disable(buffer);
#endif
- arch_spin_unlock(&ftrace_max_lock);
+ arch_spin_unlock(&global_trace.max_lock);
out:
raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
*/
barrier();
if (use_stack == 1) {
- trace.entries = &__get_cpu_var(ftrace_stack).calls[0];
+ trace.entries = this_cpu_ptr(ftrace_stack.calls);
trace.max_entries = FTRACE_STACK_MAX_ENTRIES;
if (regs)
mutex_lock(&tracing_cpumask_update_lock);
local_irq_disable();
- arch_spin_lock(&ftrace_max_lock);
+ arch_spin_lock(&tr->max_lock);
for_each_tracing_cpu(cpu) {
/*
* Increase/decrease the disabled counter if we are
ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu);
}
}
- arch_spin_unlock(&ftrace_max_lock);
+ arch_spin_unlock(&tr->max_lock);
local_irq_enable();
cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new);
#ifdef CONFIG_TRACER_SNAPSHOT
"\t\t snapshot\n"
#endif
+ "\t\t dump\n"
+ "\t\t cpudump\n"
"\t example: echo do_fault:traceoff > set_ftrace_filter\n"
"\t echo do_trap:traceoff:3 > set_ftrace_filter\n"
"\t The first one will disable tracing every time do_fault is hit\n"
return trace_poll(iter, filp, poll_table);
}
-/*
- * This is a make-shift waitqueue.
- * A tracer might use this callback on some rare cases:
- *
- * 1) the current tracer might hold the runqueue lock when it wakes up
- * a reader, hence a deadlock (sched, function, and function graph tracers)
- * 2) the function tracers, trace all functions, we don't want
- * the overhead of calling wake_up and friends
- * (and tracing them too)
- *
- * Anyway, this is really very primitive wakeup.
- */
-void poll_wait_pipe(struct trace_iterator *iter)
-{
- set_current_state(TASK_INTERRUPTIBLE);
- /* sleep for 100 msecs, and try again. */
- schedule_timeout(HZ / 10);
-}
-
/* Must be called with trace_types_lock mutex held. */
static int tracing_wait_pipe(struct file *filp)
{
return -EAGAIN;
}
- mutex_unlock(&iter->mutex);
-
- iter->trace->wait_pipe(iter);
-
- mutex_lock(&iter->mutex);
-
- if (signal_pending(current))
- return -EINTR;
-
/*
* We block until we read something and tracing is disabled.
* We still block if tracing is disabled, but we have never
*/
if (!tracing_is_on() && iter->pos)
break;
+
+ mutex_unlock(&iter->mutex);
+
+ wait_on_pipe(iter);
+
+ mutex_lock(&iter->mutex);
+
+ if (signal_pending(current))
+ return -EINTR;
}
return 1;
static const struct pipe_buf_operations tracing_pipe_buf_ops = {
.can_merge = 0,
- .map = generic_pipe_buf_map,
- .unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = generic_pipe_buf_release,
.steal = generic_pipe_buf_steal,
trace_access_lock(iter->cpu_file);
/* Fill as many pages as possible. */
- for (i = 0, rem = len; i < pipe->buffers && rem; i++) {
+ for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) {
spd.pages[i] = alloc_page(GFP_KERNEL);
if (!spd.pages[i])
break;
goto out_unlock;
}
mutex_unlock(&trace_types_lock);
- iter->trace->wait_pipe(iter);
+ wait_on_pipe(iter);
mutex_lock(&trace_types_lock);
if (signal_pending(current)) {
size = -EINTR;
/* Pipe buffer operations for a buffer. */
static const struct pipe_buf_operations buffer_pipe_buf_ops = {
.can_merge = 0,
- .map = generic_pipe_buf_map,
- .unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = buffer_pipe_buf_release,
.steal = generic_pipe_buf_steal,
trace_access_lock(iter->cpu_file);
entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
- for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) {
+ for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) {
struct page *page;
int r;
goto out;
}
mutex_unlock(&trace_types_lock);
- iter->trace->wait_pipe(iter);
+ wait_on_pipe(iter);
mutex_lock(&trace_types_lock);
if (signal_pending(current)) {
ret = -EINTR;
raw_spin_lock_init(&tr->start_lock);
+ tr->max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
+
tr->current_trace = &nop_trace;
INIT_LIST_HEAD(&tr->systems);
trace_create_file("tracing_on", 0644, d_tracer,
tr, &rb_simple_fops);
+#ifdef CONFIG_TRACER_MAX_TRACE
+ trace_create_file("tracing_max_latency", 0644, d_tracer,
+ &tr->max_latency, &tracing_max_lat_fops);
+#endif
+
if (ftrace_create_function_files(tr, d_tracer))
WARN(1, "Could not allocate function filter files");
init_tracer_debugfs(&global_trace, d_tracer);
-#ifdef CONFIG_TRACER_MAX_TRACE
- trace_create_file("tracing_max_latency", 0644, d_tracer,
- &tracing_max_latency, &tracing_max_lat_fops);
-#endif
-
trace_create_file("tracing_thresh", 0644, d_tracer,
&tracing_thresh, &tracing_max_lat_fops);
*/
global_trace.current_trace = &nop_trace;
+ global_trace.max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
+
+ ftrace_init_global_array_ops(&global_trace);
+
register_tracer(&nop_trace);
/* All seems OK, enable tracing */
projects / deliverable / linux.git / blobdiff