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When the current number of existing content processes is less than the maximum, `MinTabSelector` previously always created a new process. This is inefficient in the case where we have `dom.ipc.keepProcessesAlive.web` set and there are content processes that are idle with zero tabs -- we should allow those to be reused. Differential Revision: https://phabricator.services.mozilla.com/D80560
61 lines
2.0 KiB
JavaScript
61 lines
2.0 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Fills up aProcesses until max and then selects randomly from the available
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// ones.
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function RandomSelector() {}
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RandomSelector.prototype = {
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classID: Components.ID("{c616fcfd-9737-41f1-aa74-cee72a38f91b}"),
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QueryInterface: ChromeUtils.generateQI([Ci.nsIContentProcessProvider]),
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provideProcess(aType, aProcesses, aMaxCount) {
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if (aProcesses.length < aMaxCount) {
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return Ci.nsIContentProcessProvider.NEW_PROCESS;
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}
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return Math.floor(Math.random() * aMaxCount);
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},
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};
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// Fills up aProcesses until max and then selects one from the available
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// ones that host the least number of tabs.
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function MinTabSelector() {}
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MinTabSelector.prototype = {
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classID: Components.ID("{2dc08eaf-6eef-4394-b1df-a3a927c1290b}"),
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QueryInterface: ChromeUtils.generateQI([Ci.nsIContentProcessProvider]),
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provideProcess(aType, aProcesses, aMaxCount) {
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let min = Number.MAX_VALUE;
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let candidate = Ci.nsIContentProcessProvider.NEW_PROCESS;
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// The reason for not directly using aProcesses.length here is because if
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// we keep processes alive for testing but want a test to use only single
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// content process we can just keep relying on dom.ipc.processCount = 1
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// this way.
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let numIters = Math.min(aProcesses.length, aMaxCount);
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for (let i = 0; i < numIters; i++) {
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let process = aProcesses[i];
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let tabCount = process.tabCount;
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if (tabCount < min) {
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min = tabCount;
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candidate = i;
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}
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}
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// If all current processes have at least one tab and we have not yet
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// reached the maximum, spawn a new process.
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if (min > 0 && aProcesses.length < aMaxCount) {
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return Ci.nsIContentProcessProvider.NEW_PROCESS;
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}
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// Otherwise we use candidate.
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return candidate;
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},
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};
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var EXPORTED_SYMBOLS = ["RandomSelector", "MinTabSelector"];
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