mirror of
https://github.com/classilla/tenfourfox.git
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74 lines
2.6 KiB
JavaScript
74 lines
2.6 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var MemoryObserver = {
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observe: function mo_observe(aSubject, aTopic, aData) {
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if (aTopic == "memory-pressure") {
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if (aData != "heap-minimize") {
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this.handleLowMemory();
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}
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// The JS engine would normally GC on this notification, but since we
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// disabled that in favor of this method (bug 669346), we should gc here.
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// See bug 784040 for when this code was ported from XUL to native Fennec.
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this.gc();
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} else if (aTopic == "Memory:Dump") {
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this.dumpMemoryStats(aData);
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}
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},
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handleLowMemory: function() {
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// do things to reduce memory usage here
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let tabs = BrowserApp.tabs;
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let selected = BrowserApp.selectedTab;
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for (let i = 0; i < tabs.length; i++) {
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if (tabs[i] != selected) {
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this.zombify(tabs[i]);
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}
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}
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// Change some preferences temporarily for only this session
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let defaults = Services.prefs.getDefaultBranch(null);
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// Reduce the amount of decoded image data we keep around
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defaults.setIntPref("image.mem.max_decoded_image_kb", 0);
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// Stop using the bfcache
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defaults.setIntPref("browser.sessionhistory.max_total_viewers", 0);
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},
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zombify: function(tab) {
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let browser = tab.browser;
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let data = browser.__SS_data;
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let extra = browser.__SS_extdata;
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// We need this data to correctly create and position the new browser
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// If this browser is already a zombie, fallback to the session data
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let currentURL = browser.__SS_restore ? data.entries[0].url : browser.currentURI.spec;
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let sibling = browser.nextSibling;
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let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(browser);
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tab.destroy();
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tab.create(currentURL, { sibling: sibling, zombifying: true, delayLoad: true, isPrivate: isPrivate });
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// Reattach session store data and flag this browser so it is restored on select
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browser = tab.browser;
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browser.__SS_data = data;
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browser.__SS_extdata = extra;
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browser.__SS_restore = true;
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browser.setAttribute("pending", "true");
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},
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gc: function() {
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window.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils).garbageCollect();
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Cu.forceGC();
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},
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dumpMemoryStats: function(aLabel) {
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let memDumper = Cc["@mozilla.org/memory-info-dumper;1"].getService(Ci.nsIMemoryInfoDumper);
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memDumper.dumpMemoryInfoToTempDir(aLabel, /* anonymize = */ false,
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/* minimize = */ false);
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},
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};
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