| // 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 <array> |
| |
| #include "base/debug/activity_tracker.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, |
| PendingTask* pending_task) { |
| ScopedTaskRunActivity task_activity(*pending_task); |
| |
| tracked_objects::TaskStopwatch stopwatch; |
| stopwatch.Start(); |
| base::TimeDelta 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 task backtrace with the chain of |
| // PostTasks that resulted in this call 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. |
| static constexpr int kStackTaskTraceSnapshotSize = |
| std::tuple_size<decltype(pending_task->task_backtrace)>::value + 1; |
| std::array<const void*, kStackTaskTraceSnapshotSize> task_backtrace; |
| task_backtrace[0] = pending_task->posted_from.program_counter(); |
| std::copy(pending_task->task_backtrace.begin(), |
| pending_task->task_backtrace.end(), task_backtrace.begin() + 1); |
| debug::Alias(&task_backtrace); |
| |
| std::move(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 |