#!/usr/sbin/dtrace -Zs /* * js_objgc.d - trace JavaScript Object GC using DTrace. * Written for the JavaScript DTrace provider. * * $Id: js_objgc.d,v 1.1.1.1 2015/09/30 22:01:09 christos Exp $ * * This traces JavaScript activity from all running browers on the system * which support the JavaScript DTrace provider. * * USAGE: js_objgc.d # hit Ctrl-C to end * * FIELDS: * FILE Filename that contained the function * CLASS Class to which this new object belongs * TOTAL Object entropy (positive == uncollected) * * This script provides information on which objects are not being garbage * collected, an issue which causes the browser to steadily leak memory. * We trace object creation (+1) and destruction (-1), and provide a * summary each second of the running tally of the object class and * originating filename. If over the period of several minutes an object * type is still steadily increasing, then that would be of interest. * Be patient, depending on the rate of object creation it can take over * ten minutes for garbage collect to kick in. * * NOTES: * - it is possible that you will see negative entropy. That happens * when you begin tracing after some objects have already been created, * and then trace their destruction. * - there are other Things that GC handles, other than Objects; extra * probes can be added to trace them, should the need arise. * * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. * * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at Docs/cddl1.txt * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * CDDL HEADER END * * 09-Sep-2007 Brendan Gregg Created this. */ /* if you get dynvardrops, increase this, */ #pragma D option dynvarsize=32m #pragma D option quiet dtrace:::BEGIN { printf("Tracing... Hit Ctrl-C to end.\n"); } javascript*:::object-create /arg2/ { this->file = basename(copyinstr(arg0)); @objs[this->file, copyinstr(arg1)] = sum(1); filename[arg2] = this->file; } javascript*:::object-finalize /filename[arg2] == NULL/ { @objs["", copyinstr(arg1)] = sum(-1); } javascript*:::object-finalize /filename[arg2] != NULL/ { @objs[filename[arg2], copyinstr(arg1)] = sum(-1); filename[arg2] = 0; } profile:::tick-1sec, dtrace:::END { printf("\n %-24s %8s %-20s %23Y\n", "FILE", "TOTAL", "CLASS", walltimestamp); printa(" %-24.24s %@8d %s\n", @objs); }