Fix histogram timer to generate ProfViz compatible log.

tools/profviz/composer.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 31 matching lines @@
   var kGapWidth = 0.05;             // Gap between stack frame lines.
 
   var kY1Offset = 11;               // Offset for stack frame vs. event lines.
   var kDeoptRow = 7;                // Row displaying deopts.
   var kGetTimeHeight = 0.5;         // Height of marker displaying timed part.
   var kMaxDeoptLength = 4;          // Draw size of the largest deopt.
   var kPauseLabelPadding = 5;       // Padding for pause time labels.
   var kNumPauseLabels = 7;          // Number of biggest pauses to label.
   var kCodeKindLabelPadding = 100;  // Padding for code kind labels.
 
   var kTickHalfDuration = 0.5;      // Duration of half a tick in ms.

[Yang, 2016/03/11 08:08:38]

Can you update this comment and elsewhere to microseconds? ("us" instead of
"ms".

   var kMinRangeLength = 0.0005;     // Minimum length for an event in ms.
 
   var kNumThreads = 2;              // Number of threads.
   var kExecutionThreadId = 0;       // ID of main thread.
 
   // Init values.
   var num_timer_event = kY1Offset + 0.5;
 
   // Data structures.
   function TimerEvent(label, color, pause, thread_id) {
     assert(thread_id >= 0 && thread_id < kNumThreads, "invalid thread id");
     this.label = label;
     this.color = color;
     this.pause = pause;
     this.ranges = [];
     this.thread_id = thread_id;
     this.index = ++num_timer_event;
   }
 
   function CodeKind(color, kinds) {
     this.color = color;
     this.in_execution = [];
     this.stack_frames = [];
     for (var i = 0; i < kStackFrames; i++) this.stack_frames.push([]);
     this.kinds = kinds;
   }
 
   function Range(start, end) {
     this.start = start;  // In milliseconds.

[Yang, 2016/03/11 08:08:38]

microseconds here as well, and below.

     this.end = end;      // In milliseconds.
   }
 
   function Deopt(time, size) {
     this.time = time;  // In milliseconds.
     this.size = size;  // In bytes.
   }
 
   Range.prototype.duration = function() { return this.end - this.start; }
 
   function Tick(tick) {
     this.tick = tick;
   }
 
   var TimerEvents = {
       'V8.Execute':
         new TimerEvent("execution", "#000000", false, 0),
       'V8.External':
         new TimerEvent("external", "#3399FF", false, 0),
       'V8.CompileFullCode':
         new TimerEvent("compile unopt", "#CC0000",  true, 0),
       'V8.RecompileSynchronous':
         new TimerEvent("recompile sync", "#CC0044",  true, 0),
       'V8.RecompileConcurrent':
         new TimerEvent("recompile async", "#CC4499", false, 1),
-      'V8.CompileEval':
+      'V8.CompileEvalMicroSeconds':
         new TimerEvent("compile eval", "#CC4400",  true, 0),
       'V8.IcMiss':
         new TimerEvent("ic miss", "#CC9900", false, 0),
-      'V8.Parse':
+      'V8.ParseMicroSeconds':
         new TimerEvent("parse", "#00CC00",  true, 0),
-      'V8.PreParse':
+      'V8.PreParseMicroSeconds':
         new TimerEvent("preparse", "#44CC00",  true, 0),
-      'V8.ParseLazy':
+      'V8.ParseLazyMicroSeconds':
         new TimerEvent("lazy parse", "#00CC44",  true, 0),
       'V8.GCScavenger':
         new TimerEvent("gc scavenge", "#0044CC",  true, 0),
       'V8.GCCompactor':
         new TimerEvent("gc compaction", "#4444CC",  true, 0),
       'V8.GCContext':
         new TimerEvent("gc context", "#4400CC",  true, 0),
   };
 
   var CodeKinds = {
@@ skipping 256 matching lines @@
     pause_tolerance = (range_end - range_start) / kResX / 10;
 
     if (typeof result_callback === 'function') {
       result_callback(range_start, range_end);
     }
   };
 
 
   this.assembleOutput = function(output) {
     output("set yrange [0:" + (num_timer_event + 1) + "]");
     output("set xlabel \"execution time in ms\"");

[Yang, 2016/03/11 08:08:38]

"execution time in microseconds" please.

     output("set xrange [" + range_start + ":" + range_end + "]");
     output("set style fill pattern 2 bo 1");
     output("set style rect fs solid 1 noborder");
     output("set style line 1 lt 1 lw 1 lc rgb \"#000000\"");
     output("set border 15 lw 0.2");  // Draw thin border box.
     output("set style line 2 lt 1 lw 1 lc rgb \"#9944CC\"");
     output("set xtics out nomirror");
     output("unset key");
 
     function DrawBarBase(color, start, end, top, bottom, transparency) {
@@ skipping 117 matching lines @@
         RestrictRangesTo(execution_pauses, range_start, range_end);
     execution_pauses.sort(
         function(a, b) { return b.duration() - a.duration(); });
 
     var max_pause_time = execution_pauses.length > 0
         ? execution_pauses[0].duration() : 0;
     padding = kPauseLabelPadding * (range_end - range_start) / kResX;
     var y_scale = kY1Offset / max_pause_time / 2;
     for (var i = 0; i < execution_pauses.length && i < kNumPauseLabels; i++) {
       var pause = execution_pauses[i];
       var label_content = (pause.duration() | 0) + " ms";

[Yang, 2016/03/11 08:08:38]

" {/Symbol m}s" instead of " ms"

       var label_x = pause.end + padding;
       var label_y = Math.max(1, (pause.duration() * y_scale));
       output("set label \"" + label_content + "\" at " +
              label_x + "," + label_y + " font \"Helvetica,7'\"");
       obj_index++;
     }
 
     // Scale second Y-axis appropriately.
     var y2range = max_pause_time * num_timer_event / kY1Offset * 2;
     output("set y2range [0:" + y2range + "]");
     // Plot graph with impulses as data set.
     output("plot '-' using 1:2 axes x1y2 with impulses ls 1");
     for (var i = 0; i < execution_pauses.length; i++) {
       var pause = execution_pauses[i];
       output(pause.end + " " + pause.duration());
       obj_index++;
     }
     output("e");
     return obj_index;
   };
 }