1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
// Copyright (c) 2013 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.
'use strict';
base.requireStylesheet('tcmalloc.tcmalloc_snapshot_view');
base.require('tracing.analysis.object_snapshot_view');
base.require('tracing.analysis.util');
base.exportTo('tcmalloc', function() {
var tsRound = tracing.analysis.tsRound;
/*
* Displays a heap memory snapshot in a human readable form.
* @constructor
*/
var TcmallocSnapshotView = ui.define(
'heap-snapshot-view',
tracing.analysis.ObjectSnapshotView);
TcmallocSnapshotView.prototype = {
__proto__: tracing.analysis.ObjectSnapshotView.prototype,
decorate: function() {
this.classList.add('tcmalloc-snapshot-view');
},
updateContents: function() {
var snapshot = this.objectSnapshot_;
if (!snapshot || !snapshot.heap_) {
this.textContent = 'No heap found.';
return;
}
// Clear old snapshot view.
this.textContent = '';
// Note: "total" may actually be less than the largest allocation bin.
// This might happen if one stack is doing a lot of allocation, then
// passing off to another stack for deallocation. That stack will
// have a high "current bytes" count and the other one might be
// negative or zero. So "total" may be smaller than the largest trace.
var subhead = document.createElement('div');
subhead.textContent = 'Retaining ' +
this.getByteString_(snapshot.total_.currentBytes) + ' in ' +
snapshot.total_.currentAllocs +
' allocations. Showing > 0.1 MB.';
subhead.className = 'subhead';
this.appendChild(subhead);
// Build a nested tree-view of allocations
var myList = this.buildAllocList_(snapshot.heap_, false);
this.appendChild(myList);
},
/**
* Creates a nested list with clickable entries.
* @param {Object} heapEntry The current trace heap entry.
* @param {boolean} hide Whether this list is hidden by default.
* @return {Element} A <ul> list element.
*/
buildAllocList_: function(heapEntry, hide) {
var myList = document.createElement('ul');
myList.hidden = hide;
var keys = Object.keys(heapEntry.children);
keys.sort(function(a, b) {
// Sort from large to small.
return heapEntry.children[b].currentBytes -
heapEntry.children[a].currentBytes;
});
for (var i = 0; i < keys.length; i++) {
var traceName = keys[i];
var trace = heapEntry.children[traceName];
// Don't show small nodes - they make things harder to see.
if (trace.currentBytes < 100 * 1024)
continue;
var childCount = Object.keys(trace.children).length;
var isLeaf = childCount == 0;
var myItem = this.buildItem_(
traceName, isLeaf, trace.currentBytes, trace.currentAllocs);
myList.appendChild(myItem);
// Build a nested <ul> list of my children.
if (childCount > 0)
myItem.appendChild(this.buildAllocList_(trace, true));
}
return myList;
},
/*
* Returns a <li> for an allocation traceName of size bytes.
*/
buildItem_: function(traceName, isLeaf, bytes, allocs) {
var myItem = document.createElement('li');
myItem.className = 'trace-item';
myItem.id = traceName;
var byteDiv = document.createElement('div');
byteDiv.textContent = this.getByteString_(bytes);
byteDiv.className = 'trace-bytes';
myItem.appendChild(byteDiv);
if (traceName.length == 0) {
// The empty trace name indicates that the allocations occurred at
// this trace level, not in a sub-trace. This looks weird as the
// empty string, so replace it with something non-empty and don't
// give that line an expander.
traceName = '(here)';
} else if (traceName.indexOf('..') == 0) {
// Tasks in RunTask have special handling. They show the path of the
// filename. Convert '../../foo.cc' into 'RunTask from foo.cc'.
var lastSlash = traceName.lastIndexOf('/');
if (lastSlash != -1)
traceName = 'Task from ' + traceName.substr(lastSlash + 1);
}
var traceDiv = document.createElement('div');
traceDiv.textContent = traceName;
traceDiv.className = 'trace-name';
myItem.appendChild(traceDiv);
// Don't allow leaf nodes to be expanded.
if (isLeaf)
return myItem;
// Expand the element when it is clicked.
var self = this;
myItem.addEventListener('click', function(event) {
// Allow click on the +/- image (li) or child divs.
if (this == event.target || this == event.target.parentElement) {
this.classList.toggle('expanded');
var child = this.querySelector('ul');
child.hidden = !child.hidden;
// Highlight this stack trace in the timeline view.
self.onItemClicked_(this);
}
});
myItem.classList.add('collapsed');
return myItem;
},
onItemClicked_: function(traceItem) {
// Compute the full stack trace the user just clicked.
var traces = [];
while (traceItem.classList.contains('trace-item')) {
var traceNameDiv = traceItem.firstElementChild.nextElementSibling;
traces.unshift(traceNameDiv.textContent);
var traceNameUl = traceItem.parentElement;
traceItem = traceNameUl.parentElement;
}
// Tell the instance that this stack trace is selected.
var instance = this.objectSnapshot_.objectInstance;
instance.selectedTraces = traces;
// Invalid the viewport to cause a redraw.
var trackView = document.querySelector('.timeline-track-view');
trackView.viewport_.dispatchChangeEvent();
},
/*
* Returns a human readable string for a size in bytes.
*/
getByteString_: function(bytes) {
var mb = bytes / 1024 / 1024;
return mb.toFixed(1) + ' MB';
}
};
tracing.analysis.ObjectSnapshotView.register(
'memory::Heap', TcmallocSnapshotView);
return {
TcmallocSnapshotView: TcmallocSnapshotView
};
});
|
