src/ui/events/latency_info.cc

   1 // Copyright 2013 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/trace_event.h"
   6 #include "base/json/json_writer.h"
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/strings/stringprintf.h"
   9 #include "ui/events/latency_info.h"
  10
  11 #include <algorithm>
  12
  13 namespace {
  14
  15 const unsigned int kMaxLatencyInfoNumber = 100;
  16
  17 const char* GetComponentName(ui::LatencyComponentType type) {
  18 #define CASE_TYPE(t) case ui::t:  return #t
  19   switch (type) {
  20     CASE_TYPE(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT);
  21     CASE_TYPE(INPUT_EVENT_LATENCY_SCROLL_UPDATE_RWH_COMPONENT);
  22     CASE_TYPE(INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT);
  23     CASE_TYPE(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT);
  24     CASE_TYPE(INPUT_EVENT_LATENCY_UI_COMPONENT);
  25     CASE_TYPE(INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT);
  26     CASE_TYPE(INPUT_EVENT_LATENCY_ACKED_TOUCH_COMPONENT);
  27     CASE_TYPE(WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT);
  28     CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT);
  29     CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT);
  30     CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT);
  31     CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT);
  32     CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT);
  33     CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT);
  34     CASE_TYPE(LATENCY_INFO_LIST_TERMINATED_OVERFLOW_COMPONENT);
  35     default:
  36       DLOG(WARNING) << "Unhandled LatencyComponentType.\n";
  37       break;
  38   }
  39 #undef CASE_TYPE
  40   return "unknown";
  41 }
  42
  43 bool IsTerminalComponent(ui::LatencyComponentType type) {
  44   switch (type) {
  45     case ui::INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT:
  46     case ui::INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT:
  47     case ui::INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT:
  48     case ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT:
  49     case ui::INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT:
  50     case ui::INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT:
  51     case ui::LATENCY_INFO_LIST_TERMINATED_OVERFLOW_COMPONENT:
  52       return true;
  53     default:
  54       return false;
  55   }
  56 }
  57
  58 bool IsBeginComponent(ui::LatencyComponentType type) {
  59   return (type == ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT);
  60 }
  61
  62 // This class is for converting latency info to trace buffer friendly format.
  63 class LatencyInfoTracedValue : public base::debug::ConvertableToTraceFormat {
  64  public:
  65   static scoped_refptr<ConvertableToTraceFormat> FromValue(
  66       scoped_ptr<base::Value> value);
  67
  68   virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE;
  69
  70  private:
  71   explicit LatencyInfoTracedValue(base::Value* value);
  72   virtual ~LatencyInfoTracedValue();
  73
  74   scoped_ptr<base::Value> value_;
  75
  76   DISALLOW_COPY_AND_ASSIGN(LatencyInfoTracedValue);
  77 };
  78
  79 scoped_refptr<base::debug::ConvertableToTraceFormat>
  80 LatencyInfoTracedValue::FromValue(scoped_ptr<base::Value> value) {
  81   return scoped_refptr<base::debug::ConvertableToTraceFormat>(
  82       new LatencyInfoTracedValue(value.release()));
  83 }
  84
  85 LatencyInfoTracedValue::~LatencyInfoTracedValue() {
  86 }
  87
  88 void LatencyInfoTracedValue::AppendAsTraceFormat(std::string* out) const {
  89   std::string tmp;
  90   base::JSONWriter::Write(value_.get(), &tmp);
  91   *out += tmp;
  92 }
  93
  94 LatencyInfoTracedValue::LatencyInfoTracedValue(base::Value* value)
  95     : value_(value) {
  96 }
  97
  98 // Converts latencyinfo into format that can be dumped into trace buffer.
  99 scoped_refptr<base::debug::ConvertableToTraceFormat> AsTraceableData(
 100     const ui::LatencyInfo& latency) {
 101   scoped_ptr<base::DictionaryValue> record_data(new base::DictionaryValue());
 102   for (ui::LatencyInfo::LatencyMap::const_iterator it =
 103            latency.latency_components.begin();
 104        it != latency.latency_components.end(); ++it) {
 105     base::DictionaryValue* component_info = new base::DictionaryValue();
 106     component_info->SetDouble("comp_id", it->first.second);
 107     component_info->SetDouble("time", it->second.event_time.ToInternalValue());
 108     component_info->SetDouble("count", it->second.event_count);
 109     record_data->Set(GetComponentName(it->first.first), component_info);
 110   }
 111   record_data->SetDouble("trace_id", latency.trace_id);
 112   return LatencyInfoTracedValue::FromValue(record_data.PassAs<base::Value>());
 113 }
 114
 115 }  // namespace
 116
 117 namespace ui {
 118
 119 LatencyInfo::LatencyInfo() : trace_id(-1), terminated(false) {
 120 }
 121
 122 LatencyInfo::~LatencyInfo() {
 123 }
 124
 125 bool LatencyInfo::Verify(const std::vector<LatencyInfo>& latency_info,
 126                          const char* referring_msg) {
 127   if (latency_info.size() > kMaxLatencyInfoNumber) {
 128     LOG(ERROR) << referring_msg << ", LatencyInfo vector size "
 129                << latency_info.size() << " is too big.";
 130     return false;
 131   }
 132   return true;
 133 }
 134
 135 void LatencyInfo::CopyLatencyFrom(const LatencyInfo& other,
 136                                   LatencyComponentType type) {
 137   for (LatencyMap::const_iterator it = other.latency_components.begin();
 138        it != other.latency_components.end();
 139        ++it) {
 140     if (it->first.first == type) {
 141       AddLatencyNumberWithTimestamp(it->first.first,
 142                                     it->first.second,
 143                                     it->second.sequence_number,
 144                                     it->second.event_time,
 145                                     it->second.event_count);
 146     }
 147   }
 148 }
 149
 150 void LatencyInfo::AddNewLatencyFrom(const LatencyInfo& other) {
 151     for (LatencyMap::const_iterator it = other.latency_components.begin();
 152          it != other.latency_components.end();
 153          ++it) {
 154       if (!FindLatency(it->first.first, it->first.second, NULL)) {
 155         AddLatencyNumberWithTimestamp(it->first.first,
 156                                       it->first.second,
 157                                       it->second.sequence_number,
 158                                       it->second.event_time,
 159                                       it->second.event_count);
 160       }
 161     }
 162 }
 163
 164 void LatencyInfo::AddLatencyNumber(LatencyComponentType component,
 165                                    int64 id,
 166                                    int64 component_sequence_number) {
 167   AddLatencyNumberWithTimestamp(component, id, component_sequence_number,
 168                                 base::TimeTicks::HighResNow(), 1);
 169 }
 170
 171 void LatencyInfo::AddLatencyNumberWithTimestamp(LatencyComponentType component,
 172                                                 int64 id,
 173                                                 int64 component_sequence_number,
 174                                                 base::TimeTicks time,
 175                                                 uint32 event_count) {
 176   if (IsBeginComponent(component)) {
 177     // Should only ever add begin component once.
 178     CHECK_EQ(-1, trace_id);
 179     trace_id = component_sequence_number;
 180     TRACE_EVENT_ASYNC_BEGIN0("benchmark",
 181                              "InputLatency",
 182                              TRACE_ID_DONT_MANGLE(trace_id));
 183   }
 184
 185   LatencyMap::key_type key = std::make_pair(component, id);
 186   LatencyMap::iterator it = latency_components.find(key);
 187   if (it == latency_components.end()) {
 188     LatencyComponent info = {component_sequence_number, time, event_count};
 189     latency_components[key] = info;
 190   } else {
 191     it->second.sequence_number = std::max(component_sequence_number,
 192                                           it->second.sequence_number);
 193     uint32 new_count = event_count + it->second.event_count;
 194     if (event_count > 0 && new_count != 0) {
 195       // Do a weighted average, so that the new event_time is the average of
 196       // the times of events currently in this structure with the time passed
 197       // into this method.
 198       it->second.event_time += (time - it->second.event_time) * event_count /
 199           new_count;
 200       it->second.event_count = new_count;
 201     }
 202   }
 203
 204   if (IsTerminalComponent(component) && trace_id != -1) {
 205     // Should only ever add terminal component once.
 206     CHECK(!terminated);
 207     terminated = true;
 208     TRACE_EVENT_ASYNC_END1("benchmark",
 209                            "InputLatency",
 210                            TRACE_ID_DONT_MANGLE(trace_id),
 211                            "data", AsTraceableData(*this));
 212   }
 213 }
 214
 215 bool LatencyInfo::FindLatency(LatencyComponentType type,
 216                               int64 id,
 217                               LatencyComponent* output) const {
 218   LatencyMap::const_iterator it = latency_components.find(
 219       std::make_pair(type, id));
 220   if (it == latency_components.end())
 221     return false;
 222   if (output)
 223     *output = it->second;
 224   return true;
 225 }
 226
 227 void LatencyInfo::RemoveLatency(LatencyComponentType type) {
 228   LatencyMap::iterator it = latency_components.begin();
 229   while (it != latency_components.end()) {
 230     if (it->first.first == type) {
 231       LatencyMap::iterator tmp = it;
 232       ++it;
 233       latency_components.erase(tmp);
 234     } else {
 235       it++;
 236     }
 237   }
 238 }
 239
 240 void LatencyInfo::Clear() {
 241   latency_components.clear();
 242 }
 243
 244 void LatencyInfo::TraceEventType(const char* event_type) {
 245   TRACE_EVENT_ASYNC_STEP_INTO0("benchmark",
 246                                "InputLatency",
 247                                TRACE_ID_DONT_MANGLE(trace_id),
 248                                event_type);
 249 }
 250
 251 }  // namespace ui