Daniel Erat | b8cf949 | 2015-07-06 13:18:13 -0600 | [diff] [blame^] | 1 | // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "base/debug/task_annotator.h" |
| 6 | |
| 7 | #include "base/debug/alias.h" |
| 8 | #include "base/pending_task.h" |
| 9 | #include "base/trace_event/trace_event.h" |
| 10 | #include "base/tracked_objects.h" |
| 11 | |
| 12 | namespace base { |
| 13 | namespace debug { |
| 14 | |
| 15 | TaskAnnotator::TaskAnnotator() { |
| 16 | } |
| 17 | |
| 18 | TaskAnnotator::~TaskAnnotator() { |
| 19 | } |
| 20 | |
| 21 | void TaskAnnotator::DidQueueTask(const char* queue_function, |
| 22 | const PendingTask& pending_task) { |
| 23 | TRACE_EVENT_FLOW_BEGIN0(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"), |
| 24 | queue_function, |
| 25 | TRACE_ID_MANGLE(GetTaskTraceID(pending_task))); |
| 26 | } |
| 27 | |
| 28 | void TaskAnnotator::RunTask(const char* queue_function, |
| 29 | const char* run_function, |
| 30 | const PendingTask& pending_task) { |
| 31 | tracked_objects::TaskStopwatch stopwatch; |
| 32 | stopwatch.Start(); |
| 33 | tracked_objects::Duration queue_duration = |
| 34 | stopwatch.StartTime() - pending_task.EffectiveTimePosted(); |
| 35 | |
| 36 | TRACE_EVENT_FLOW_END1(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"), |
| 37 | queue_function, |
| 38 | TRACE_ID_MANGLE(GetTaskTraceID(pending_task)), |
| 39 | "queue_duration", |
| 40 | queue_duration.InMilliseconds()); |
| 41 | |
| 42 | // When tracing memory for posted tasks it's more valuable to attribute the |
| 43 | // memory allocations to the source function than generically to the task |
| 44 | // runner. |
| 45 | TRACE_EVENT_WITH_MEMORY_TAG2( |
| 46 | "toplevel", |
| 47 | run_function, |
| 48 | pending_task.posted_from.function_name(), // Name for memory tracking. |
| 49 | "src_file", |
| 50 | pending_task.posted_from.file_name(), |
| 51 | "src_func", |
| 52 | pending_task.posted_from.function_name()); |
| 53 | |
| 54 | // Before running the task, store the program counter where it was posted |
| 55 | // and deliberately alias it to ensure it is on the stack if the task |
| 56 | // crashes. Be careful not to assume that the variable itself will have the |
| 57 | // expected value when displayed by the optimizer in an optimized build. |
| 58 | // Look at a memory dump of the stack. |
| 59 | const void* program_counter = pending_task.posted_from.program_counter(); |
| 60 | debug::Alias(&program_counter); |
| 61 | |
| 62 | pending_task.task.Run(); |
| 63 | |
| 64 | stopwatch.Stop(); |
| 65 | tracked_objects::ThreadData::TallyRunOnNamedThreadIfTracking( |
| 66 | pending_task, stopwatch); |
| 67 | } |
| 68 | |
| 69 | uint64 TaskAnnotator::GetTaskTraceID(const PendingTask& task) const { |
| 70 | return (static_cast<uint64>(task.sequence_num) << 32) | |
| 71 | ((static_cast<uint64>(reinterpret_cast<intptr_t>(this)) << 32) >> 32); |
| 72 | } |
| 73 | |
| 74 | } // namespace debug |
| 75 | } // namespace base |