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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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toolkit/modules/Memory.jsm Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
this.EXPORTED_SYMBOLS = ["Memory"];
const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
// How long we should wait for the Promise to resolve.
const TIMEOUT_INTERVAL = 2000;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/Timer.jsm");
this.Memory = {
/**
* This function returns a Promise that resolves with an Object that
* describes basic memory usage for each content process and the parent
* process.
* @returns Promise
* @resolves JS Object
* An Object in the following format:
* {
* "parent": {
* uss: <int>,
* rss: <int>,
* },
* <pid>: {
* uss: <int>,
* rss: <int>,
* },
* ...
* }
*/
summary() {
if (!this._pendingPromise) {
this._pendingPromise = new Promise((resolve) => {
this._pendingResolve = resolve;
this._summaries = {};
Services.ppmm.broadcastAsyncMessage("Memory:GetSummary");
Services.ppmm.addMessageListener("Memory:Summary", this);
this._pendingTimeout = setTimeout(() => { this.finish(); }, TIMEOUT_INTERVAL);
});
}
return this._pendingPromise;
},
receiveMessage(msg) {
if (msg.name != "Memory:Summary" || !this._pendingResolve) {
return;
}
this._summaries[msg.data.pid] = msg.data.summary;
// Now we check if we are done for all content processes.
// Services.ppmm.childCount is a count of how many processes currently
// exist that might respond to messages sent through the ppmm, including
// the parent process. So we subtract the parent process with the "- 1",
// and that’s how many content processes we’re waiting for.
if (Object.keys(this._summaries).length >= Services.ppmm.childCount - 1) {
this.finish();
}
},
finish() {
// Code to gather the USS and RSS values for the parent process. This
// functions the same way as in process-content.js.
let memMgr = Cc["@mozilla.org/memory-reporter-manager;1"]
.getService(Ci.nsIMemoryReporterManager);
let rss = memMgr.resident;
let uss = memMgr.residentUnique;
this._summaries["Parent"] = { uss, rss };
this._pendingResolve(this._summaries);
this._pendingResolve = null;
this._summaries = null;
this._pendingPromise = null;
clearTimeout(this._pendingTimeout);
Services.ppmm.removeMessageListener("Memory:Summary", this);
}
};