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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 "net/disk_cache/backend_impl.h" | 5 #include "net/disk_cache/backend_impl.h" |
6 | 6 |
7 #include "base/file_path.h" | 7 #include "base/file_path.h" |
8 #include "base/file_util.h" | 8 #include "base/file_util.h" |
9 #include "base/message_loop.h" | 9 #include "base/message_loop.h" |
10 #include "base/metrics/field_trial.h" | 10 #include "base/metrics/field_trial.h" |
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167 // Initializes the field trial structures to allow performance measurements | 167 // Initializes the field trial structures to allow performance measurements |
168 // for the current cache configuration. Returns true if we are active part of | 168 // for the current cache configuration. Returns true if we are active part of |
169 // the CacheThrottle field trial. | 169 // the CacheThrottle field trial. |
170 bool SetFieldTrialInfo(int size_group) { | 170 bool SetFieldTrialInfo(int size_group) { |
171 static bool first = true; | 171 static bool first = true; |
172 if (!first) | 172 if (!first) |
173 return false; | 173 return false; |
174 | 174 |
175 // Field trials involve static objects so we have to do this only once. | 175 // Field trials involve static objects so we have to do this only once. |
176 first = false; | 176 first = false; |
177 scoped_refptr<base::FieldTrial> trial1 = | 177 scoped_refptr<base::FieldTrial> trial1( |
178 new base::FieldTrial("CacheSize", 10); | 178 new base::FieldTrial("CacheSize", 10)); |
179 std::string group1 = base::StringPrintf("CacheSizeGroup_%d", size_group); | 179 std::string group1 = base::StringPrintf("CacheSizeGroup_%d", size_group); |
180 trial1->AppendGroup(group1, base::FieldTrial::kAllRemainingProbability); | 180 trial1->AppendGroup(group1, base::FieldTrial::kAllRemainingProbability); |
181 | 181 |
182 scoped_refptr<base::FieldTrial> trial2 = | 182 scoped_refptr<base::FieldTrial> trial2( |
183 new base::FieldTrial("CacheThrottle", 100); | 183 new base::FieldTrial("CacheThrottle", 100)); |
184 int group2a = trial2->AppendGroup("CacheThrottle_On", 10); // 10 % in. | 184 int group2a = trial2->AppendGroup("CacheThrottle_On", 10); // 10 % in. |
185 trial2->AppendGroup("CacheThrottle_Off", 10); // 10 % control. | 185 trial2->AppendGroup("CacheThrottle_Off", 10); // 10 % control. |
186 | 186 |
187 return trial2->group() == group2a; | 187 return trial2->group() == group2a; |
188 } | 188 } |
189 | 189 |
190 // ------------------------------------------------------------------------ | 190 // ------------------------------------------------------------------------ |
191 | 191 |
192 // This class takes care of building an instance of the backend. | 192 // This class takes care of building an instance of the backend. |
193 class CacheCreator { | 193 class CacheCreator { |
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2060 if (total_memory > kMaxBuffersSize || total_memory <= 0) | 2060 if (total_memory > kMaxBuffersSize || total_memory <= 0) |
2061 total_memory = kMaxBuffersSize; | 2061 total_memory = kMaxBuffersSize; |
2062 | 2062 |
2063 done = true; | 2063 done = true; |
2064 } | 2064 } |
2065 | 2065 |
2066 return static_cast<int>(total_memory); | 2066 return static_cast<int>(total_memory); |
2067 } | 2067 } |
2068 | 2068 |
2069 } // namespace disk_cache | 2069 } // namespace disk_cache |
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