The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/mobile/android/chrome/content/MemoryObserver.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,65 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
     1.6 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +"use strict";
     1.8 +
     1.9 +var MemoryObserver = {
    1.10 +  observe: function mo_observe(aSubject, aTopic, aData) {
    1.11 +    if (aTopic == "memory-pressure") {
    1.12 +      if (aData != "heap-minimize") {
    1.13 +        this.handleLowMemory();
    1.14 +      }
    1.15 +      // The JS engine would normally GC on this notification, but since we
    1.16 +      // disabled that in favor of this method (bug 669346), we should gc here.
    1.17 +      // See bug 784040 for when this code was ported from XUL to native Fennec.
    1.18 +      this.gc();
    1.19 +    } else if (aTopic == "Memory:Dump") {
    1.20 +      this.dumpMemoryStats(aData);
    1.21 +    }
    1.22 +  },
    1.23 +
    1.24 +  handleLowMemory: function() {
    1.25 +    // do things to reduce memory usage here
    1.26 +    let tabs = BrowserApp.tabs;
    1.27 +    let selected = BrowserApp.selectedTab;
    1.28 +    for (let i = 0; i < tabs.length; i++) {
    1.29 +      if (tabs[i] != selected) {
    1.30 +        this.zombify(tabs[i]);
    1.31 +        Telemetry.addData("FENNEC_TAB_ZOMBIFIED", (Date.now() - tabs[i].lastTouchedAt) / 1000);
    1.32 +      }
    1.33 +    }
    1.34 +    Telemetry.addData("FENNEC_LOWMEM_TAB_COUNT", tabs.length);
    1.35 +  },
    1.36 +
    1.37 +  zombify: function(tab) {
    1.38 +    let browser = tab.browser;
    1.39 +    let data = browser.__SS_data;
    1.40 +    let extra = browser.__SS_extdata;
    1.41 +
    1.42 +    // We need this data to correctly create and position the new browser
    1.43 +    // If this browser is already a zombie, fallback to the session data
    1.44 +    let currentURL = browser.__SS_restore ? data.entries[0].url : browser.currentURI.spec;
    1.45 +    let sibling = browser.nextSibling;
    1.46 +    let isPrivate = PrivateBrowsingUtils.isWindowPrivate(browser.contentWindow);
    1.47 +
    1.48 +    tab.destroy();
    1.49 +    tab.create(currentURL, { sibling: sibling, zombifying: true, delayLoad: true, isPrivate: isPrivate });
    1.50 +
    1.51 +    // Reattach session store data and flag this browser so it is restored on select
    1.52 +    browser = tab.browser;
    1.53 +    browser.__SS_data = data;
    1.54 +    browser.__SS_extdata = extra;
    1.55 +    browser.__SS_restore = true;
    1.56 +    browser.setAttribute("pending", "true");
    1.57 +  },
    1.58 +
    1.59 +  gc: function() {
    1.60 +    window.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils).garbageCollect();
    1.61 +    Cu.forceGC();
    1.62 +  },
    1.63 +
    1.64 +  dumpMemoryStats: function(aLabel) {
    1.65 +    let memDumper = Cc["@mozilla.org/memory-info-dumper;1"].getService(Ci.nsIMemoryInfoDumper);
    1.66 +    memDumper.dumpMemoryInfoToTempDir(aLabel, /* minimize = */ false);
    1.67 +  },
    1.68 +};