ui/events/latency_info.h

   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 #ifndef UI_EVENTS_LATENCY_INFO_H_
   6 #define UI_EVENTS_LATENCY_INFO_H_
   7
   8 #include <string>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/containers/small_map.h"
  14 #include "base/gtest_prod_util.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/time/time.h"
  17 #include "base/trace_event/trace_event.h"
  18 #include "ipc/ipc_param_traits.h"
  19 #include "ui/events/events_base_export.h"
  20
  21 namespace ui {
  22
  23 enum LatencyComponentType {
  24   // ---------------------------BEGIN COMPONENT-------------------------------
  25   // BEGIN COMPONENT is when we show the latency begin in chrome://tracing.
  26   // Timestamp when the input event is sent from RenderWidgetHost to renderer.
  27   INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
  28   // In threaded scrolling, main thread scroll listener update is async to
  29   // scroll processing in impl thread. This is the timestamp when we consider
  30   // the main thread scroll listener update is begun.
  31   LATENCY_BEGIN_SCROLL_LISTENER_UPDATE_MAIN_COMPONENT,
  32   // ---------------------------NORMAL COMPONENT-------------------------------
  33   // The original timestamp of the touch event which converts to scroll update.
  34   INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT,
  35   // The original timestamp of the touch event which converts to the *first*
  36   // scroll update in a scroll gesture sequence.
  37   INPUT_EVENT_LATENCY_FIRST_SCROLL_UPDATE_ORIGINAL_COMPONENT,
  38   // Original timestamp for input event (e.g. timestamp from kernel).
  39   INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
  40   // Timestamp when the UI event is created.
  41   INPUT_EVENT_LATENCY_UI_COMPONENT,
  42   // This is special component indicating there is rendering scheduled for
  43   // the event associated with this LatencyInfo on main thread.
  44   INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_MAIN_COMPONENT,
  45   // This is special component indicating there is rendering scheduled for
  46   // the event associated with this LatencyInfo on impl thread.
  47   INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_IMPL_COMPONENT,
  48   // Timestamp when a scroll update is forwarded to the main thread.
  49   INPUT_EVENT_LATENCY_FORWARD_SCROLL_UPDATE_TO_MAIN_COMPONENT,
  50   // Timestamp when the event's ack is received by the RWH.
  51   INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT,
  52   // Frame number when a window snapshot was requested. The snapshot
  53   // is taken when the rendering results actually reach the screen.
  54   WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT,
  55   // Timestamp when a tab is requested to be shown.
  56   TAB_SHOW_COMPONENT,
  57   // Timestamp when the frame is swapped in renderer.
  58   INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT,
  59   // Timestamp of when the browser process receives a buffer swap notification
  60   // from the renderer.
  61   INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT,
  62   // Timestamp of when the gpu service began swap buffers, unlike
  63   // INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT which measures after.
  64   INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT,
  65   // ---------------------------TERMINAL COMPONENT-----------------------------
  66   // TERMINAL COMPONENT is when we show the latency end in chrome://tracing.
  67   // Timestamp when the mouse event is acked from renderer and it does not
  68   // cause any rendering scheduled.
  69   INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT,
  70   // Timestamp when the touch event is acked from renderer and it does not
  71   // cause any rendering schedueld and does not generate any gesture event.
  72   INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT,
  73   // Timestamp when the gesture event is acked from renderer, and it does not
  74   // cause any rendering schedueld.
  75   INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT,
  76   // Timestamp when the frame is swapped (i.e. when the rendering caused by
  77   // input event actually takes effect).
  78   INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,
  79   // This component indicates that the input causes a commit to be scheduled
  80   // but the commit failed.
  81   INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT,
  82   // This component indicates that the input causes a commit to be scheduled
  83   // but the commit was aborted since it carried no new information.
  84   INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT,
  85   // This component indicates that the input causes a swap to be scheduled
  86   // but the swap failed.
  87   INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
  88   LATENCY_COMPONENT_TYPE_LAST =
  89     INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
  90 };
  91
  92 class EVENTS_BASE_EXPORT LatencyInfo {
  93  public:
  94   struct LatencyComponent {
  95     // Nondecreasing number that can be used to determine what events happened
  96     // in the component at the time this struct was sent on to the next
  97     // component.
  98     int64 sequence_number;
  99     // Average time of events that happened in this component.
 100     base::TimeTicks event_time;
 101     // Count of events that happened in this component
 102     uint32 event_count;
 103   };
 104
 105   struct EVENTS_BASE_EXPORT InputCoordinate {
 106     InputCoordinate();
 107     InputCoordinate(float x, float y);
 108
 109     float x;
 110     float y;
 111   };
 112
 113   // Empirically determined constant based on a typical scroll sequence.
 114   enum { kTypicalMaxComponentsPerLatencyInfo = 10 };
 115
 116   enum { kMaxInputCoordinates = 2 };
 117
 118   // Map a Latency Component (with a component-specific int64 id) to a
 119   // component info.
 120   typedef base::SmallMap<
 121       std::map<std::pair<LatencyComponentType, int64>, LatencyComponent>,
 122       kTypicalMaxComponentsPerLatencyInfo> LatencyMap;
 123
 124   LatencyInfo();
 125   ~LatencyInfo();
 126
 127   // For test only.
 128   LatencyInfo(int64 trace_id, bool terminated);
 129
 130   // Returns true if the vector |latency_info| is valid. Returns false
 131   // if it is not valid and log the |referring_msg|.
 132   // This function is mainly used to check the latency_info vector that
 133   // is passed between processes using IPC message has reasonable size
 134   // so that we are confident the IPC message is not corrupted/compromised.
 135   // This check will go away once the IPC system has better built-in scheme
 136   // for corruption/compromise detection.
 137   static bool Verify(const std::vector<LatencyInfo>& latency_info,
 138                      const char* referring_msg);
 139
 140   // Copy LatencyComponents with type |type| from |other| into |this|.
 141   void CopyLatencyFrom(const LatencyInfo& other, LatencyComponentType type);
 142
 143   // Add LatencyComponents that are in |other| but not in |this|.
 144   void AddNewLatencyFrom(const LatencyInfo& other);
 145
 146   // Modifies the current sequence number for a component, and adds a new
 147   // sequence number with the current timestamp.
 148   void AddLatencyNumber(LatencyComponentType component,
 149                         int64 id,
 150                         int64 component_sequence_number);
 151
 152   // Similar to |AddLatencyNumber|, and also appends |trace_name_str| to
 153   // the trace event's name.
 154   // This function should only be called when adding a BEGIN component.
 155   void AddLatencyNumberWithTraceName(LatencyComponentType component,
 156                                      int64 id,
 157                                      int64 component_sequence_number,
 158                                      const char* trace_name_str);
 159
 160   // Modifies the current sequence number and adds a certain number of events
 161   // for a specific component.
 162   void AddLatencyNumberWithTimestamp(LatencyComponentType component,
 163                                      int64 id,
 164                                      int64 component_sequence_number,
 165                                      base::TimeTicks time,
 166                                      uint32 event_count);
 167
 168   // Returns true if the a component with |type| and |id| is found in
 169   // the latency_components and the component is stored to |output| if
 170   // |output| is not NULL. Returns false if no such component is found.
 171   bool FindLatency(LatencyComponentType type,
 172                    int64 id,
 173                    LatencyComponent* output) const;
 174
 175   void RemoveLatency(LatencyComponentType type);
 176
 177   // Returns true if there is still room for keeping the |input_coordinate|,
 178   // false otherwise.
 179   bool AddInputCoordinate(const InputCoordinate& input_coordinate);
 180
 181   uint32 input_coordinates_size() const { return input_coordinates_size_; }
 182   const InputCoordinate* input_coordinates() const {
 183     return input_coordinates_;
 184   }
 185   const LatencyMap& latency_components() const { return latency_components_; }
 186
 187   bool terminated() const { return terminated_; }
 188   int64 trace_id() const { return trace_id_; }
 189
 190  private:
 191   void AddLatencyNumberWithTimestampImpl(LatencyComponentType component,
 192                                          int64 id,
 193                                          int64 component_sequence_number,
 194                                          base::TimeTicks time,
 195                                          uint32 event_count,
 196                                          const char* trace_name_str);
 197
 198   // Converts latencyinfo into format that can be dumped into trace buffer.
 199   scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsTraceableData();
 200
 201   // Shown as part of the name of the trace event for this LatencyInfo.
 202   // String is empty if no tracing is enabled.
 203   std::string trace_name_;
 204
 205   LatencyMap latency_components_;
 206
 207   // These coordinates represent window coordinates of the original input event.
 208   uint32 input_coordinates_size_;
 209   InputCoordinate input_coordinates_[kMaxInputCoordinates];
 210
 211   // The unique id for matching the ASYNC_BEGIN/END trace event.
 212   int64 trace_id_;
 213   // Whether a terminal component has been added.
 214   bool terminated_;
 215
 216   FRIEND_TEST_ALL_PREFIXES(LatencyInfoParamTraitsTest, Basic);
 217   friend struct IPC::ParamTraits<ui::LatencyInfo>;
 218 };
 219
 220 }  // namespace ui
 221
 222 #endif  // UI_EVENTS_LATENCY_INFO_H_