1 /*
2 * Copyright 2011, The Android Open Source Project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "PerformanceMonitor.h"
27
28 #include <wtf/text/CString.h>
29
30 namespace WebCore {
31
PerformanceMonitor()32 PerformanceMonitor::PerformanceMonitor()
33 {
34 }
35
~PerformanceMonitor()36 PerformanceMonitor::~PerformanceMonitor()
37 {
38 }
39
start(const String & tag)40 void PerformanceMonitor::start(const String &tag)
41 {
42 if (tag.isEmpty())
43 return;
44 PerfItem *item;
45 if (m_tags.contains(tag))
46 item = m_tags.get(tag);
47 else {
48 item = new PerfItem();
49 m_tags.set(tag, item);
50 }
51 gettimeofday(&(item->start_time), NULL);
52 }
53
stop(const String & tag)54 void PerformanceMonitor::stop(const String &tag)
55 {
56 if (!m_tags.contains(tag))
57 return;
58 PerfItem *item = m_tags.get(tag);
59 struct timeval end;
60 gettimeofday(&end, NULL);
61 long seconds, useconds;
62 seconds = end.tv_sec - item->start_time.tv_sec;
63 useconds = end.tv_usec - item->start_time.tv_usec;
64
65 float mtime = (seconds * 1000.0) + (useconds/1000.0);
66
67 float avg = 0;
68 if (item->average_ms) {
69 item->average_ms = (item->average_ms + mtime) / 2;
70 } else
71 item->average_ms = mtime;
72 }
73
getAverageDuration(const String & tag)74 float PerformanceMonitor::getAverageDuration(const String &tag)
75 {
76 if (tag.isEmpty() || !m_tags.contains(tag))
77 return 0;
78 return m_tags.get(tag)->average_ms;
79 }
80
81 } // namespace WebCore
82