blob: 4ba4d91b887d8e55a609824e89b5223815a20097 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug/task_annotator.h"
#include "base/debug/alias.h"
#include "base/pending_task.h"
#include "base/trace_event/trace_event.h"
#include "base/tracked_objects.h"
namespace base {
namespace debug {
TaskAnnotator::TaskAnnotator() {
}
TaskAnnotator::~TaskAnnotator() {
}
void TaskAnnotator::DidQueueTask(const char* queue_function,
const PendingTask& pending_task) {
TRACE_EVENT_WITH_FLOW0(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
queue_function,
TRACE_ID_MANGLE(GetTaskTraceID(pending_task)),
TRACE_EVENT_FLAG_FLOW_OUT);
}
void TaskAnnotator::RunTask(const char* queue_function,
const PendingTask& pending_task) {
tracked_objects::TaskStopwatch stopwatch;
stopwatch.Start();
tracked_objects::Duration queue_duration =
stopwatch.StartTime() - pending_task.EffectiveTimePosted();
TRACE_EVENT_WITH_FLOW1(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
queue_function,
TRACE_ID_MANGLE(GetTaskTraceID(pending_task)),
TRACE_EVENT_FLAG_FLOW_IN,
"queue_duration",
queue_duration.InMilliseconds());
// Before running the task, store the program counter where it was posted
// and deliberately alias it to ensure it is on the stack if the task
// crashes. Be careful not to assume that the variable itself will have the
// expected value when displayed by the optimizer in an optimized build.
// Look at a memory dump of the stack.
const void* program_counter = pending_task.posted_from.program_counter();
debug::Alias(&program_counter);
pending_task.task.Run();
stopwatch.Stop();
tracked_objects::ThreadData::TallyRunOnNamedThreadIfTracking(
pending_task, stopwatch);
}
uint64_t TaskAnnotator::GetTaskTraceID(const PendingTask& task) const {
return (static_cast<uint64_t>(task.sequence_num) << 32) |
((static_cast<uint64_t>(reinterpret_cast<intptr_t>(this)) << 32) >>
32);
}
} // namespace debug
} // namespace base
|
