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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "chrome/browser/chromeos/memory/oom_priority_manager.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 #include <set> | |
| 9 #include <vector> | |
| 10 | |
| 11 #include "ash/multi_profile_uma.h" | |
| 12 #include "ash/session/session_state_delegate.h" | |
| 13 #include "ash/shell.h" | |
| 14 #include "base/bind.h" | |
| 15 #include "base/bind_helpers.h" | |
| 16 #include "base/command_line.h" | |
| 17 #include "base/memory/memory_pressure_monitor.h" | |
| 18 #include "base/metrics/field_trial.h" | |
| 19 #include "base/metrics/histogram.h" | |
| 20 #include "base/process/process.h" | |
| 21 #include "base/strings/string16.h" | |
| 22 #include "base/strings/string_number_conversions.h" | |
| 23 #include "base/strings/string_util.h" | |
| 24 #include "base/strings/utf_string_conversions.h" | |
| 25 #include "base/synchronization/lock.h" | |
| 26 #include "base/threading/thread.h" | |
| 27 #include "build/build_config.h" | |
| 28 #include "chrome/browser/browser_process.h" | |
| 29 #include "chrome/browser/browser_process_platform_part_chromeos.h" | |
| 30 #include "chrome/browser/chromeos/memory/low_memory_observer.h" | |
| 31 #include "chrome/browser/chromeos/memory/oom_memory_details.h" | |
| 32 #include "chrome/browser/chromeos/memory/system_memory_stats_recorder.h" | |
| 33 #include "chrome/browser/ui/browser.h" | |
| 34 #include "chrome/browser/ui/browser_iterator.h" | |
| 35 #include "chrome/browser/ui/browser_list.h" | |
| 36 #include "chrome/browser/ui/host_desktop.h" | |
| 37 #include "chrome/browser/ui/tab_contents/tab_contents_iterator.h" | |
| 38 #include "chrome/browser/ui/tabs/tab_strip_model.h" | |
| 39 #include "chrome/browser/ui/tabs/tab_utils.h" | |
| 40 #include "chrome/common/chrome_constants.h" | |
| 41 #include "chrome/common/url_constants.h" | |
| 42 #include "chromeos/chromeos_switches.h" | |
| 43 #include "content/public/browser/browser_thread.h" | |
| 44 #include "content/public/browser/notification_service.h" | |
| 45 #include "content/public/browser/notification_types.h" | |
| 46 #include "content/public/browser/render_process_host.h" | |
| 47 #include "content/public/browser/render_widget_host.h" | |
| 48 #include "content/public/browser/web_contents.h" | |
| 49 #include "content/public/browser/zygote_host_linux.h" | |
| 50 | |
| 51 using base::TimeDelta; | |
| 52 using base::TimeTicks; | |
| 53 using content::BrowserThread; | |
| 54 using content::WebContents; | |
| 55 | |
| 56 namespace chromeos { | |
| 57 | |
| 58 namespace { | |
| 59 | |
| 60 // The default interval in seconds after which to adjust the oom_score_adj | |
| 61 // value. | |
| 62 const int kAdjustmentIntervalSeconds = 10; | |
| 63 | |
| 64 // For each period of this length we record a statistic to indicate whether | |
| 65 // or not the user experienced a low memory event. If you change this interval | |
| 66 // you must replace Tabs.Discard.DiscardInLastMinute with a new statistic. | |
| 67 const int kRecentTabDiscardIntervalSeconds = 60; | |
| 68 | |
| 69 // If there has been no priority adjustment in this interval, we assume the | |
| 70 // machine was suspended and correct our timing statistics. | |
| 71 const int kSuspendThresholdSeconds = kAdjustmentIntervalSeconds * 4; | |
| 72 | |
| 73 // When switching to a new tab the tab's renderer's OOM score needs to be | |
| 74 // updated to reflect its front-most status and protect it from discard. | |
| 75 // However, doing this immediately might slow down tab switch time, so wait | |
| 76 // a little while before doing the adjustment. | |
| 77 const int kFocusedTabScoreAdjustIntervalMs = 500; | |
| 78 | |
| 79 // Returns a unique ID for a WebContents. Do not cast back to a pointer, as | |
| 80 // the WebContents could be deleted if the user closed the tab. | |
| 81 int64 IdFromWebContents(WebContents* web_contents) { | |
| 82 return reinterpret_cast<int64>(web_contents); | |
| 83 } | |
| 84 | |
| 85 } // namespace | |
| 86 | |
| 87 //////////////////////////////////////////////////////////////////////////////// | |
| 88 // OomPriorityManager | |
| 89 | |
| 90 OomPriorityManager::TabStats::TabStats() | |
| 91 : is_app(false), | |
| 92 is_reloadable_ui(false), | |
| 93 is_playing_audio(false), | |
| 94 is_pinned(false), | |
| 95 is_selected(false), | |
| 96 is_discarded(false), | |
| 97 renderer_handle(0), | |
| 98 tab_contents_id(0) { | |
| 99 } | |
| 100 | |
| 101 OomPriorityManager::TabStats::~TabStats() { | |
| 102 } | |
| 103 | |
| 104 OomPriorityManager::OomPriorityManager() | |
| 105 : focused_tab_process_info_(std::make_pair(0, 0)), | |
| 106 discard_count_(0), | |
| 107 recent_tab_discard_(false) { | |
| 108 // Use the old |LowMemoryObserver| when there is no |MemoryPressureMonitor|. | |
| 109 if (!base::MemoryPressureMonitor::Get()) | |
| 110 low_memory_observer_.reset(new LowMemoryObserver); | |
| 111 | |
| 112 registrar_.Add(this, | |
| 113 content::NOTIFICATION_RENDERER_PROCESS_CLOSED, | |
| 114 content::NotificationService::AllBrowserContextsAndSources()); | |
| 115 registrar_.Add(this, | |
| 116 content::NOTIFICATION_RENDERER_PROCESS_TERMINATED, | |
| 117 content::NotificationService::AllBrowserContextsAndSources()); | |
| 118 registrar_.Add(this, | |
| 119 content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED, | |
| 120 content::NotificationService::AllBrowserContextsAndSources()); | |
| 121 } | |
| 122 | |
| 123 OomPriorityManager::~OomPriorityManager() { | |
| 124 Stop(); | |
| 125 } | |
| 126 | |
| 127 void OomPriorityManager::Start() { | |
| 128 if (!timer_.IsRunning()) { | |
| 129 timer_.Start(FROM_HERE, | |
| 130 TimeDelta::FromSeconds(kAdjustmentIntervalSeconds), | |
| 131 this, | |
| 132 &OomPriorityManager::AdjustOomPriorities); | |
| 133 } | |
| 134 if (!recent_tab_discard_timer_.IsRunning()) { | |
| 135 recent_tab_discard_timer_.Start( | |
| 136 FROM_HERE, | |
| 137 TimeDelta::FromSeconds(kRecentTabDiscardIntervalSeconds), | |
| 138 this, | |
| 139 &OomPriorityManager::RecordRecentTabDiscard); | |
| 140 } | |
| 141 start_time_ = TimeTicks::Now(); | |
| 142 // If a |LowMemoryObserver| exists we use the old system, otherwise we create | |
| 143 // a |MemoryPressureListener| to listen for memory events. | |
| 144 if (low_memory_observer_) { | |
| 145 low_memory_observer_->Start(); | |
| 146 } else { | |
| 147 base::MemoryPressureMonitor* monitor = base::MemoryPressureMonitor::Get(); | |
| 148 if (monitor) { | |
| 149 memory_pressure_listener_.reset(new base::MemoryPressureListener( | |
| 150 base::Bind(&OomPriorityManager::OnMemoryPressure, | |
| 151 base::Unretained(this)))); | |
| 152 base::MemoryPressureListener::MemoryPressureLevel level = | |
| 153 monitor->GetCurrentPressureLevel(); | |
| 154 if (level == | |
| 155 base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) { | |
| 156 OnMemoryPressure(level); | |
| 157 } | |
| 158 } | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 void OomPriorityManager::Stop() { | |
| 163 timer_.Stop(); | |
| 164 recent_tab_discard_timer_.Stop(); | |
| 165 if (low_memory_observer_) | |
| 166 low_memory_observer_->Stop(); | |
| 167 else | |
| 168 memory_pressure_listener_.reset(); | |
| 169 } | |
| 170 | |
| 171 std::vector<base::string16> OomPriorityManager::GetTabTitles() { | |
| 172 TabStatsList stats = GetTabStatsOnUIThread(); | |
| 173 base::AutoLock oom_score_autolock(oom_score_lock_); | |
| 174 std::vector<base::string16> titles; | |
| 175 titles.reserve(stats.size()); | |
| 176 TabStatsList::iterator it = stats.begin(); | |
| 177 for ( ; it != stats.end(); ++it) { | |
| 178 base::string16 str; | |
| 179 str.reserve(4096); | |
| 180 int score = oom_score_map_[it->child_process_host_id]; | |
| 181 str += base::IntToString16(score); | |
| 182 str += base::ASCIIToUTF16(" - "); | |
| 183 str += it->title; | |
| 184 str += base::ASCIIToUTF16(it->is_app ? " app" : ""); | |
| 185 str += base::ASCIIToUTF16(it->is_reloadable_ui ? " reloadable_ui" : ""); | |
| 186 str += base::ASCIIToUTF16(it->is_playing_audio ? " playing_audio" : ""); | |
| 187 str += base::ASCIIToUTF16(it->is_pinned ? " pinned" : ""); | |
| 188 str += base::ASCIIToUTF16(it->is_discarded ? " discarded" : ""); | |
| 189 titles.push_back(str); | |
| 190 } | |
| 191 return titles; | |
| 192 } | |
| 193 | |
| 194 // TODO(jamescook): This should consider tabs with references to other tabs, | |
| 195 // such as tabs created with JavaScript window.open(). We might want to | |
| 196 // discard the entire set together, or use that in the priority computation. | |
| 197 bool OomPriorityManager::DiscardTab() { | |
| 198 DCHECK_CURRENTLY_ON(BrowserThread::UI); | |
| 199 TabStatsList stats = GetTabStatsOnUIThread(); | |
| 200 if (stats.empty()) | |
| 201 return false; | |
| 202 // Loop until we find a non-discarded tab to kill. | |
| 203 for (TabStatsList::const_reverse_iterator stats_rit = stats.rbegin(); | |
| 204 stats_rit != stats.rend(); | |
| 205 ++stats_rit) { | |
| 206 int64 least_important_tab_id = stats_rit->tab_contents_id; | |
| 207 if (DiscardTabById(least_important_tab_id)) | |
| 208 return true; | |
| 209 } | |
| 210 return false; | |
| 211 } | |
| 212 | |
| 213 void OomPriorityManager::LogMemoryAndDiscardTab() { | |
| 214 LogMemory("Tab Discards Memory details", | |
| 215 base::Bind(&OomPriorityManager::PurgeMemoryAndDiscardTabs)); | |
| 216 } | |
| 217 | |
| 218 void OomPriorityManager::LogMemory(const std::string& title, | |
| 219 const base::Closure& callback) { | |
| 220 DCHECK_CURRENTLY_ON(BrowserThread::UI); | |
| 221 OomMemoryDetails::Log(title, callback); | |
| 222 } | |
| 223 | |
| 224 /////////////////////////////////////////////////////////////////////////////// | |
| 225 // OomPriorityManager, private: | |
| 226 | |
| 227 // static | |
| 228 void OomPriorityManager::PurgeMemoryAndDiscardTabs() { | |
| 229 if (g_browser_process && | |
| 230 g_browser_process->platform_part()->oom_priority_manager()) { | |
| 231 OomPriorityManager* manager = | |
| 232 g_browser_process->platform_part()->oom_priority_manager(); | |
| 233 manager->PurgeBrowserMemory(); | |
| 234 manager->DiscardTab(); | |
| 235 } | |
| 236 } | |
| 237 | |
| 238 // static | |
| 239 bool OomPriorityManager::IsReloadableUI(const GURL& url) { | |
| 240 // There are many chrome:// UI URLs, but only look for the ones that users | |
| 241 // are likely to have open. Most of the benefit is the from NTP URL. | |
| 242 const char* const kReloadableUrlPrefixes[] = { | |
| 243 chrome::kChromeUIDownloadsURL, | |
| 244 chrome::kChromeUIHistoryURL, | |
| 245 chrome::kChromeUINewTabURL, | |
| 246 chrome::kChromeUISettingsURL, | |
| 247 }; | |
| 248 // Prefix-match against the table above. Use strncmp to avoid allocating | |
| 249 // memory to convert the URL prefix constants into std::strings. | |
| 250 for (size_t i = 0; i < arraysize(kReloadableUrlPrefixes); ++i) { | |
| 251 if (!strncmp(url.spec().c_str(), | |
| 252 kReloadableUrlPrefixes[i], | |
| 253 strlen(kReloadableUrlPrefixes[i]))) | |
| 254 return true; | |
| 255 } | |
| 256 return false; | |
| 257 } | |
| 258 | |
| 259 bool OomPriorityManager::DiscardTabById(int64 target_web_contents_id) { | |
| 260 for (chrome::BrowserIterator it; !it.done(); it.Next()) { | |
| 261 Browser* browser = *it; | |
| 262 TabStripModel* model = browser->tab_strip_model(); | |
| 263 for (int idx = 0; idx < model->count(); idx++) { | |
| 264 // Can't discard tabs that are already discarded or active. | |
| 265 if (model->IsTabDiscarded(idx) || (model->active_index() == idx)) | |
| 266 continue; | |
| 267 WebContents* web_contents = model->GetWebContentsAt(idx); | |
| 268 int64 web_contents_id = IdFromWebContents(web_contents); | |
| 269 if (web_contents_id == target_web_contents_id) { | |
| 270 LOG(WARNING) << "Discarding tab " << idx | |
| 271 << " id " << target_web_contents_id; | |
| 272 // Record statistics before discarding because we want to capture the | |
| 273 // memory state that lead to the discard. | |
| 274 RecordDiscardStatistics(); | |
| 275 model->DiscardWebContentsAt(idx); | |
| 276 recent_tab_discard_ = true; | |
| 277 return true; | |
| 278 } | |
| 279 } | |
| 280 } | |
| 281 return false; | |
| 282 } | |
| 283 | |
| 284 void OomPriorityManager::RecordDiscardStatistics() { | |
| 285 // Record a raw count so we can compare to discard reloads. | |
| 286 discard_count_++; | |
| 287 UMA_HISTOGRAM_CUSTOM_COUNTS( | |
| 288 "Tabs.Discard.DiscardCount", discard_count_, 1, 1000, 50); | |
| 289 | |
| 290 // TODO(jamescook): Maybe incorporate extension count? | |
| 291 UMA_HISTOGRAM_CUSTOM_COUNTS( | |
| 292 "Tabs.Discard.TabCount", GetTabCount(), 1, 100, 50); | |
| 293 // Record the discarded tab in relation to the amount of simultaneously | |
| 294 // logged in users. | |
| 295 ash::MultiProfileUMA::RecordDiscardedTab( | |
| 296 ash::Shell::GetInstance()->session_state_delegate()-> | |
| 297 NumberOfLoggedInUsers()); | |
| 298 | |
| 299 // TODO(jamescook): If the time stats prove too noisy, then divide up users | |
| 300 // based on how heavily they use Chrome using tab count as a proxy. | |
| 301 // Bin into <= 1, <= 2, <= 4, <= 8, etc. | |
| 302 if (last_discard_time_.is_null()) { | |
| 303 // This is the first discard this session. | |
| 304 TimeDelta interval = TimeTicks::Now() - start_time_; | |
| 305 int interval_seconds = static_cast<int>(interval.InSeconds()); | |
| 306 // Record time in seconds over an interval of approximately 1 day. | |
| 307 UMA_HISTOGRAM_CUSTOM_COUNTS( | |
| 308 "Tabs.Discard.InitialTime2", interval_seconds, 1, 100000, 50); | |
| 309 } else { | |
| 310 // Not the first discard, so compute time since last discard. | |
| 311 TimeDelta interval = TimeTicks::Now() - last_discard_time_; | |
| 312 int interval_ms = static_cast<int>(interval.InMilliseconds()); | |
| 313 // Record time in milliseconds over an interval of approximately 1 day. | |
| 314 // Start at 100 ms to get extra resolution in the target 750 ms range. | |
| 315 UMA_HISTOGRAM_CUSTOM_COUNTS( | |
| 316 "Tabs.Discard.IntervalTime2", interval_ms, 100, 100000 * 1000, 50); | |
| 317 } | |
| 318 // Record chromeos's concept of system memory usage at the time of the | |
| 319 // discard. | |
| 320 RecordMemoryStats(RECORD_MEMORY_STATS_TAB_DISCARDED); | |
| 321 | |
| 322 // Set up to record the next interval. | |
| 323 last_discard_time_ = TimeTicks::Now(); | |
| 324 } | |
| 325 | |
| 326 void OomPriorityManager::RecordRecentTabDiscard() { | |
| 327 DCHECK_CURRENTLY_ON(BrowserThread::UI); | |
| 328 // If we change the interval we need to change the histogram name. | |
| 329 UMA_HISTOGRAM_BOOLEAN("Tabs.Discard.DiscardInLastMinute", | |
| 330 recent_tab_discard_); | |
| 331 // Reset for the next interval. | |
| 332 recent_tab_discard_ = false; | |
| 333 } | |
| 334 | |
| 335 void OomPriorityManager::PurgeBrowserMemory() { | |
| 336 // Based on experimental evidence, attempts to free memory from renderers | |
| 337 // have been too slow to use in OOM situations (V8 garbage collection) or | |
| 338 // do not lead to persistent decreased usage (image/bitmap caches). This | |
| 339 // function therefore only targets large blocks of memory in the browser. | |
| 340 // Note that other objects will listen to MemoryPressureListener events | |
| 341 // to release memory. | |
| 342 for (TabContentsIterator it; !it.done(); it.Next()) { | |
| 343 WebContents* web_contents = *it; | |
| 344 // Screenshots can consume ~5 MB per web contents for platforms that do | |
| 345 // touch back/forward. | |
| 346 web_contents->GetController().ClearAllScreenshots(); | |
| 347 } | |
| 348 } | |
| 349 | |
| 350 int OomPriorityManager::GetTabCount() const { | |
| 351 int tab_count = 0; | |
| 352 for (chrome::BrowserIterator it; !it.done(); it.Next()) | |
| 353 tab_count += it->tab_strip_model()->count(); | |
| 354 return tab_count; | |
| 355 } | |
| 356 | |
| 357 // Returns true if |first| is considered less desirable to be killed | |
| 358 // than |second|. | |
| 359 bool OomPriorityManager::CompareTabStats(TabStats first, | |
| 360 TabStats second) { | |
| 361 // Being currently selected is most important to protect. | |
| 362 if (first.is_selected != second.is_selected) | |
| 363 return first.is_selected; | |
| 364 | |
| 365 // Tab with internal web UI like NTP or Settings are good choices to discard, | |
| 366 // so protect non-Web UI and let the other conditionals finish the sort. | |
| 367 if (first.is_reloadable_ui != second.is_reloadable_ui) | |
| 368 return !first.is_reloadable_ui; | |
| 369 | |
| 370 // Being pinned is important to protect. | |
| 371 if (first.is_pinned != second.is_pinned) | |
| 372 return first.is_pinned; | |
| 373 | |
| 374 // Being an app is important too, as you're the only visible surface in the | |
| 375 // window and we don't want to discard that. | |
| 376 if (first.is_app != second.is_app) | |
| 377 return first.is_app; | |
| 378 | |
| 379 // Protect streaming audio and video conferencing tabs. | |
| 380 if (first.is_playing_audio != second.is_playing_audio) | |
| 381 return first.is_playing_audio; | |
| 382 | |
| 383 // TODO(jamescook): Incorporate sudden_termination_allowed into the sort | |
| 384 // order. We don't do this now because pages with unload handlers set | |
| 385 // sudden_termination_allowed false, and that covers too many common pages | |
| 386 // with ad networks and statistics scripts. Ideally we would like to check | |
| 387 // for beforeUnload handlers, which are likely to present a dialog asking | |
| 388 // if the user wants to discard state. crbug.com/123049 | |
| 389 | |
| 390 // Being more recently active is more important. | |
| 391 return first.last_active > second.last_active; | |
| 392 } | |
| 393 | |
| 394 void OomPriorityManager::AdjustFocusedTabScoreOnFileThread() { | |
| 395 DCHECK_CURRENTLY_ON(BrowserThread::FILE); | |
| 396 base::AutoLock oom_score_autolock(oom_score_lock_); | |
| 397 base::ProcessHandle pid = focused_tab_process_info_.second; | |
| 398 content::ZygoteHost::GetInstance()->AdjustRendererOOMScore( | |
| 399 pid, chrome::kLowestRendererOomScore); | |
| 400 oom_score_map_[focused_tab_process_info_.first] = | |
| 401 chrome::kLowestRendererOomScore; | |
| 402 } | |
| 403 | |
| 404 void OomPriorityManager::OnFocusTabScoreAdjustmentTimeout() { | |
| 405 BrowserThread::PostTask( | |
| 406 BrowserThread::FILE, FROM_HERE, | |
| 407 base::Bind(&OomPriorityManager::AdjustFocusedTabScoreOnFileThread, | |
| 408 base::Unretained(this))); | |
| 409 } | |
| 410 | |
| 411 void OomPriorityManager::Observe(int type, | |
| 412 const content::NotificationSource& source, | |
| 413 const content::NotificationDetails& details) { | |
| 414 base::AutoLock oom_score_autolock(oom_score_lock_); | |
| 415 switch (type) { | |
| 416 case content::NOTIFICATION_RENDERER_PROCESS_CLOSED: | |
| 417 case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED: { | |
| 418 content::RenderProcessHost* host = | |
| 419 content::Source<content::RenderProcessHost>(source).ptr(); | |
| 420 oom_score_map_.erase(host->GetID()); | |
| 421 if (!low_memory_observer_) { | |
| 422 // Coming here we know that a renderer was just killed and memory should | |
| 423 // come back into the pool. However - the memory pressure observer did | |
| 424 // not yet update its status and therefore we ask it to redo the | |
| 425 // measurement, calling us again if we have to release more. | |
| 426 // Note: We do not only accelerate the discarding speed by doing another | |
| 427 // check in short succession - we also accelerate it because the timer | |
| 428 // driven MemoryPressureMonitor will continue to produce timed events | |
| 429 // on top. So the longer the cleanup phase takes, the more tabs will | |
| 430 // get discarded in parallel. | |
| 431 base::chromeos::MemoryPressureMonitor* monitor = | |
| 432 base::chromeos::MemoryPressureMonitor::Get(); | |
| 433 if (monitor) | |
| 434 monitor->ScheduleEarlyCheck(); | |
| 435 } | |
| 436 break; | |
| 437 } | |
| 438 case content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED: { | |
| 439 bool visible = *content::Details<bool>(details).ptr(); | |
| 440 if (visible) { | |
| 441 content::RenderProcessHost* render_host = | |
| 442 content::Source<content::RenderWidgetHost>(source).ptr()-> | |
| 443 GetProcess(); | |
| 444 focused_tab_process_info_ = std::make_pair(render_host->GetID(), | |
| 445 render_host->GetHandle()); | |
| 446 | |
| 447 // If the currently focused tab already has a lower score, do not | |
| 448 // set it. This can happen in case the newly focused tab is script | |
| 449 // connected to the previous tab. | |
| 450 ProcessScoreMap::iterator it; | |
| 451 it = oom_score_map_.find(focused_tab_process_info_.first); | |
| 452 if (it == oom_score_map_.end() | |
| 453 || it->second != chrome::kLowestRendererOomScore) { | |
| 454 // By starting a timer we guarantee that the tab is focused for | |
| 455 // certain amount of time. Secondly, it also does not add overhead | |
| 456 // to the tab switching time. | |
| 457 if (focus_tab_score_adjust_timer_.IsRunning()) | |
| 458 focus_tab_score_adjust_timer_.Reset(); | |
| 459 else | |
| 460 focus_tab_score_adjust_timer_.Start(FROM_HERE, | |
| 461 TimeDelta::FromMilliseconds(kFocusedTabScoreAdjustIntervalMs), | |
| 462 this, &OomPriorityManager::OnFocusTabScoreAdjustmentTimeout); | |
| 463 } | |
| 464 } | |
| 465 break; | |
| 466 } | |
| 467 default: | |
| 468 NOTREACHED() << L"Received unexpected notification"; | |
| 469 break; | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 // Here we collect most of the information we need to sort the | |
| 474 // existing renderers in priority order, and hand out oom_score_adj | |
| 475 // scores based on that sort order. | |
| 476 // | |
| 477 // Things we need to collect on the browser thread (because | |
| 478 // TabStripModel isn't thread safe): | |
| 479 // 1) whether or not a tab is pinned | |
| 480 // 2) last time a tab was selected | |
| 481 // 3) is the tab currently selected | |
| 482 void OomPriorityManager::AdjustOomPriorities() { | |
| 483 if (BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH)->empty()) | |
| 484 return; | |
| 485 | |
| 486 // Check for a discontinuity in time caused by the machine being suspended. | |
| 487 if (!last_adjust_time_.is_null()) { | |
| 488 TimeDelta suspend_time = TimeTicks::Now() - last_adjust_time_; | |
| 489 if (suspend_time.InSeconds() > kSuspendThresholdSeconds) { | |
| 490 // We were probably suspended, move our event timers forward in time so | |
| 491 // when we subtract them out later we are counting "uptime". | |
| 492 start_time_ += suspend_time; | |
| 493 if (!last_discard_time_.is_null()) | |
| 494 last_discard_time_ += suspend_time; | |
| 495 } | |
| 496 } | |
| 497 last_adjust_time_ = TimeTicks::Now(); | |
| 498 | |
| 499 TabStatsList stats_list = GetTabStatsOnUIThread(); | |
| 500 BrowserThread::PostTask( | |
| 501 BrowserThread::FILE, FROM_HERE, | |
| 502 base::Bind(&OomPriorityManager::AdjustOomPrioritiesOnFileThread, | |
| 503 base::Unretained(this), stats_list)); | |
| 504 } | |
| 505 | |
| 506 OomPriorityManager::TabStatsList OomPriorityManager::GetTabStatsOnUIThread() { | |
| 507 DCHECK_CURRENTLY_ON(BrowserThread::UI); | |
| 508 TabStatsList stats_list; | |
| 509 stats_list.reserve(32); // 99% of users have < 30 tabs open | |
| 510 bool browser_active = true; | |
| 511 const BrowserList* ash_browser_list = | |
| 512 BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH); | |
| 513 for (BrowserList::const_reverse_iterator browser_iterator = | |
| 514 ash_browser_list->begin_last_active(); | |
| 515 browser_iterator != ash_browser_list->end_last_active(); | |
| 516 ++browser_iterator) { | |
| 517 Browser* browser = *browser_iterator; | |
| 518 bool is_browser_for_app = browser->is_app(); | |
| 519 const TabStripModel* model = browser->tab_strip_model(); | |
| 520 for (int i = 0; i < model->count(); i++) { | |
| 521 WebContents* contents = model->GetWebContentsAt(i); | |
| 522 if (!contents->IsCrashed()) { | |
| 523 TabStats stats; | |
| 524 stats.is_app = is_browser_for_app; | |
| 525 stats.is_reloadable_ui = | |
| 526 IsReloadableUI(contents->GetLastCommittedURL()); | |
| 527 stats.is_playing_audio = chrome::IsPlayingAudio(contents); | |
| 528 stats.is_pinned = model->IsTabPinned(i); | |
| 529 stats.is_selected = browser_active && model->IsTabSelected(i); | |
| 530 stats.is_discarded = model->IsTabDiscarded(i); | |
| 531 stats.last_active = contents->GetLastActiveTime(); | |
| 532 stats.renderer_handle = contents->GetRenderProcessHost()->GetHandle(); | |
| 533 stats.child_process_host_id = contents->GetRenderProcessHost()->GetID(); | |
| 534 stats.title = contents->GetTitle(); | |
| 535 stats.tab_contents_id = IdFromWebContents(contents); | |
| 536 stats_list.push_back(stats); | |
| 537 } | |
| 538 } | |
| 539 // We process the active browser window in the first iteration. | |
| 540 browser_active = false; | |
| 541 } | |
| 542 // Sort the data we collected so that least desirable to be | |
| 543 // killed is first, most desirable is last. | |
| 544 std::sort(stats_list.begin(), stats_list.end(), CompareTabStats); | |
| 545 return stats_list; | |
| 546 } | |
| 547 | |
| 548 // static | |
| 549 std::vector<OomPriorityManager::ProcessInfo> | |
| 550 OomPriorityManager::GetChildProcessInfos( | |
| 551 const TabStatsList& stats_list) { | |
| 552 std::vector<ProcessInfo> process_infos; | |
| 553 std::set<base::ProcessHandle> already_seen; | |
| 554 for (TabStatsList::const_iterator iterator = stats_list.begin(); | |
| 555 iterator != stats_list.end(); ++iterator) { | |
| 556 // stats_list contains entries for already-discarded tabs. If the PID | |
| 557 // (renderer_handle) is zero, we don't need to adjust the oom_score. | |
| 558 if (iterator->renderer_handle == 0) | |
| 559 continue; | |
| 560 | |
| 561 bool inserted = already_seen.insert(iterator->renderer_handle).second; | |
| 562 if (!inserted) { | |
| 563 // We've already seen this process handle. | |
| 564 continue; | |
| 565 } | |
| 566 | |
| 567 process_infos.push_back(std::make_pair( | |
| 568 iterator->child_process_host_id, iterator->renderer_handle)); | |
| 569 } | |
| 570 return process_infos; | |
| 571 } | |
| 572 | |
| 573 void OomPriorityManager::AdjustOomPrioritiesOnFileThread( | |
| 574 TabStatsList stats_list) { | |
| 575 DCHECK_CURRENTLY_ON(BrowserThread::FILE); | |
| 576 base::AutoLock oom_score_autolock(oom_score_lock_); | |
| 577 | |
| 578 // Remove any duplicate PIDs. Order of the list is maintained, so each | |
| 579 // renderer process will take on the oom_score_adj of the most important | |
| 580 // (least likely to be killed) tab. | |
| 581 std::vector<ProcessInfo> process_infos = GetChildProcessInfos(stats_list); | |
| 582 | |
| 583 // Now we assign priorities based on the sorted list. We're | |
| 584 // assigning priorities in the range of kLowestRendererOomScore to | |
| 585 // kHighestRendererOomScore (defined in chrome_constants.h). | |
| 586 // oom_score_adj takes values from -1000 to 1000. Negative values | |
| 587 // are reserved for system processes, and we want to give some room | |
| 588 // below the range we're using to allow for things that want to be | |
| 589 // above the renderers in priority, so the defined range gives us | |
| 590 // some variation in priority without taking up the whole range. In | |
| 591 // the end, however, it's a pretty arbitrary range to use. Higher | |
| 592 // values are more likely to be killed by the OOM killer. | |
| 593 float priority = chrome::kLowestRendererOomScore; | |
| 594 const int kPriorityRange = chrome::kHighestRendererOomScore - | |
| 595 chrome::kLowestRendererOomScore; | |
| 596 float priority_increment = | |
| 597 static_cast<float>(kPriorityRange) / process_infos.size(); | |
| 598 for (const auto& process_info : process_infos) { | |
| 599 int score = static_cast<int>(priority + 0.5f); | |
| 600 ProcessScoreMap::iterator it = | |
| 601 oom_score_map_.find(process_info.first); | |
| 602 // If a process has the same score as the newly calculated value, | |
| 603 // do not set it. | |
| 604 if (it == oom_score_map_.end() || it->second != score) { | |
| 605 content::ZygoteHost::GetInstance()->AdjustRendererOOMScore( | |
| 606 process_info.second, score); | |
| 607 oom_score_map_[process_info.first] = score; | |
| 608 } | |
| 609 priority += priority_increment; | |
| 610 } | |
| 611 } | |
| 612 | |
| 613 void OomPriorityManager::OnMemoryPressure( | |
| 614 base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) { | |
| 615 // For the moment we only do something when we reach a critical state. | |
| 616 if (memory_pressure_level == | |
| 617 base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) { | |
| 618 LogMemoryAndDiscardTab(); | |
| 619 } | |
| 620 // TODO(skuhne): If more memory pressure levels are introduced, we might | |
| 621 // consider to call PurgeBrowserMemory() before CRITICAL is reached. | |
| 622 } | |
| 623 | |
| 624 } // namespace chromeos | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1188823002:
[MemoryPressure] Move chrome/browser/chromeos/* to chrome/browser/memory/*. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master