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Issue 1550593002: Switch to standard integer types in chrome/browser/, part 2 of 4. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 12 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "chrome/browser/net/predictor.h" 5 #include "chrome/browser/net/predictor.h"
6 6
7 #include <algorithm> 7 #include <algorithm>
8 #include <cmath> 8 #include <cmath>
9 #include <set> 9 #include <set>
10 #include <sstream> 10 #include <sstream>
11 11
12 #include "base/basictypes.h"
13 #include "base/bind.h" 12 #include "base/bind.h"
14 #include "base/compiler_specific.h" 13 #include "base/compiler_specific.h"
15 #include "base/containers/mru_cache.h" 14 #include "base/containers/mru_cache.h"
16 #include "base/location.h" 15 #include "base/location.h"
17 #include "base/logging.h" 16 #include "base/logging.h"
17 #include "base/macros.h"
18 #include "base/metrics/histogram.h" 18 #include "base/metrics/histogram.h"
19 #include "base/prefs/pref_service.h" 19 #include "base/prefs/pref_service.h"
20 #include "base/prefs/scoped_user_pref_update.h" 20 #include "base/prefs/scoped_user_pref_update.h"
21 #include "base/profiler/scoped_tracker.h" 21 #include "base/profiler/scoped_tracker.h"
22 #include "base/single_thread_task_runner.h" 22 #include "base/single_thread_task_runner.h"
23 #include "base/stl_util.h" 23 #include "base/stl_util.h"
24 #include "base/strings/string_split.h" 24 #include "base/strings/string_split.h"
25 #include "base/strings/string_util.h" 25 #include "base/strings/string_util.h"
26 #include "base/strings/stringprintf.h" 26 #include "base/strings/stringprintf.h"
27 #include "base/synchronization/waitable_event.h" 27 #include "base/synchronization/waitable_event.h"
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66 // subresources needed) by a factor of 2 after about 24 hours of uptime. We will 66 // subresources needed) by a factor of 2 after about 24 hours of uptime. We will
67 // trim roughly once-an-hour of uptime. The ratio to use in each trim operation 67 // trim roughly once-an-hour of uptime. The ratio to use in each trim operation
68 // is then the 24th root of 0.5. If a user only surfs for 4 hours a day, then 68 // is then the 24th root of 0.5. If a user only surfs for 4 hours a day, then
69 // after about 6 days they will have halved all their estimates of subresource 69 // after about 6 days they will have halved all their estimates of subresource
70 // connections. Once this falls below kDiscardableExpectedValue the referrer 70 // connections. Once this falls below kDiscardableExpectedValue the referrer
71 // will be discarded. 71 // will be discarded.
72 // TODO(jar): Measure size of referrer lists in the field. Consider an adaptive 72 // TODO(jar): Measure size of referrer lists in the field. Consider an adaptive
73 // system that uses a higher trim ratio when the list is large. 73 // system that uses a higher trim ratio when the list is large.
74 // static 74 // static
75 const double Predictor::kReferrerTrimRatio = 0.97153; 75 const double Predictor::kReferrerTrimRatio = 0.97153;
76 const int64 Predictor::kDurationBetweenTrimmingsHours = 1; 76 const int64_t Predictor::kDurationBetweenTrimmingsHours = 1;
77 const int64 Predictor::kDurationBetweenTrimmingIncrementsSeconds = 15; 77 const int64_t Predictor::kDurationBetweenTrimmingIncrementsSeconds = 15;
78 const size_t Predictor::kUrlsTrimmedPerIncrement = 5u; 78 const size_t Predictor::kUrlsTrimmedPerIncrement = 5u;
79 const size_t Predictor::kMaxSpeculativeParallelResolves = 3; 79 const size_t Predictor::kMaxSpeculativeParallelResolves = 3;
80 const int Predictor::kMaxUnusedSocketLifetimeSecondsWithoutAGet = 10; 80 const int Predictor::kMaxUnusedSocketLifetimeSecondsWithoutAGet = 10;
81 // To control our congestion avoidance system, which discards a queue when 81 // To control our congestion avoidance system, which discards a queue when
82 // resolutions are "taking too long," we need an expected resolution time. 82 // resolutions are "taking too long," we need an expected resolution time.
83 // Common average is in the range of 300-500ms. 83 // Common average is in the range of 300-500ms.
84 const int kExpectedResolutionTimeMs = 500; 84 const int kExpectedResolutionTimeMs = 500;
85 const int Predictor::kTypicalSpeculativeGroupSize = 8; 85 const int Predictor::kTypicalSpeculativeGroupSize = 8;
86 const int Predictor::kMaxSpeculativeResolveQueueDelayMs = 86 const int Predictor::kMaxSpeculativeResolveQueueDelayMs =
87 (kExpectedResolutionTimeMs * Predictor::kTypicalSpeculativeGroupSize) / 87 (kExpectedResolutionTimeMs * Predictor::kTypicalSpeculativeGroupSize) /
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1307 } 1307 }
1308 1308
1309 void SimplePredictor::ShutdownOnUIThread() { 1309 void SimplePredictor::ShutdownOnUIThread() {
1310 SetShutdown(true); 1310 SetShutdown(true);
1311 } 1311 }
1312 1312
1313 bool SimplePredictor::CanPrefetchAndPrerender() const { return true; } 1313 bool SimplePredictor::CanPrefetchAndPrerender() const { return true; }
1314 bool SimplePredictor::CanPreresolveAndPreconnect() const { return true; } 1314 bool SimplePredictor::CanPreresolveAndPreconnect() const { return true; }
1315 1315
1316 } // namespace chrome_browser_net 1316 } // namespace chrome_browser_net
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