The Tor Browser / file comparison
comparison: mobile/android/chrome/content/MemoryObserver.js
mobile/android/chrome/content/MemoryObserver.js
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
equal
deleted
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replaced
| -1:000000000000 | 0:c28db9f0d2f3 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 "use strict"; | |
| 5 | |
| 6 var MemoryObserver = { | |
| 7 observe: function mo_observe(aSubject, aTopic, aData) { | |
| 8 if (aTopic == "memory-pressure") { | |
| 9 if (aData != "heap-minimize") { | |
| 10 this.handleLowMemory(); | |
| 11 } | |
| 12 // The JS engine would normally GC on this notification, but since we | |
| 13 // disabled that in favor of this method (bug 669346), we should gc here. | |
| 14 // See bug 784040 for when this code was ported from XUL to native Fennec. | |
| 15 this.gc(); | |
| 16 } else if (aTopic == "Memory:Dump") { | |
| 17 this.dumpMemoryStats(aData); | |
| 18 } | |
| 19 }, | |
| 20 | |
| 21 handleLowMemory: function() { | |
| 22 // do things to reduce memory usage here | |
| 23 let tabs = BrowserApp.tabs; | |
| 24 let selected = BrowserApp.selectedTab; | |
| 25 for (let i = 0; i < tabs.length; i++) { | |
| 26 if (tabs[i] != selected) { | |
| 27 this.zombify(tabs[i]); | |
| 28 Telemetry.addData("FENNEC_TAB_ZOMBIFIED", (Date.now() - tabs[i].lastTouchedAt) / 1000); | |
| 29 } | |
| 30 } | |
| 31 Telemetry.addData("FENNEC_LOWMEM_TAB_COUNT", tabs.length); | |
| 32 }, | |
| 33 | |
| 34 zombify: function(tab) { | |
| 35 let browser = tab.browser; | |
| 36 let data = browser.__SS_data; | |
| 37 let extra = browser.__SS_extdata; | |
| 38 | |
| 39 // We need this data to correctly create and position the new browser | |
| 40 // If this browser is already a zombie, fallback to the session data | |
| 41 let currentURL = browser.__SS_restore ? data.entries[0].url : browser.currentURI.spec; | |
| 42 let sibling = browser.nextSibling; | |
| 43 let isPrivate = PrivateBrowsingUtils.isWindowPrivate(browser.contentWindow); | |
| 44 | |
| 45 tab.destroy(); | |
| 46 tab.create(currentURL, { sibling: sibling, zombifying: true, delayLoad: true, isPrivate: isPrivate }); | |
| 47 | |
| 48 // Reattach session store data and flag this browser so it is restored on select | |
| 49 browser = tab.browser; | |
| 50 browser.__SS_data = data; | |
| 51 browser.__SS_extdata = extra; | |
| 52 browser.__SS_restore = true; | |
| 53 browser.setAttribute("pending", "true"); | |
| 54 }, | |
| 55 | |
| 56 gc: function() { | |
| 57 window.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils).garbageCollect(); | |
| 58 Cu.forceGC(); | |
| 59 }, | |
| 60 | |
| 61 dumpMemoryStats: function(aLabel) { | |
| 62 let memDumper = Cc["@mozilla.org/memory-info-dumper;1"].getService(Ci.nsIMemoryInfoDumper); | |
| 63 memDumper.dumpMemoryInfoToTempDir(aLabel, /* minimize = */ false); | |
| 64 }, | |
| 65 }; |
