forked from mirrors/gecko-dev
69 lines
2.5 KiB
JavaScript
69 lines
2.5 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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const MAX_CONTENT_VIEWERS_PREF = "browser.sessionhistory.max_total_viewers";
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var MemoryObserver = {
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// When we turn off the bfcache by overwriting the old default value, we want
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// to be able to restore it later on if memory pressure decreases again.
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_defaultMaxContentViewers: -1,
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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-pressure-stop") {
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this.handleEnoughMemory();
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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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if (!Services.prefs.getBoolPref("browser.tabs.disableBackgroundZombification")) {
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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 && !tabs[i].playingAudio) {
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tabs[i].zombify();
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}
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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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// Stop using the bfcache
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if (!Services.prefs.getBoolPref("browser.sessionhistory.bfcacheIgnoreMemoryPressure")) {
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this._defaultMaxContentViewers = defaults.getIntPref(MAX_CONTENT_VIEWERS_PREF);
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defaults.setIntPref(MAX_CONTENT_VIEWERS_PREF, 0);
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}
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},
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handleEnoughMemory: function() {
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// Re-enable the bfcache
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let defaults = Services.prefs.getDefaultBranch(null);
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if (!Services.prefs.getBoolPref("browser.sessionhistory.bfcacheIgnoreMemoryPressure")) {
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defaults.setIntPref(MAX_CONTENT_VIEWERS_PREF, this._defaultMaxContentViewers);
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}
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},
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gc: function() {
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window.windowUtils.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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