90 lines
2.7 KiB
D
Executable File
90 lines
2.7 KiB
D
Executable File
#!/usr/sbin/dtrace -Zs
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/*
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* js_objgc.d - trace JavaScript Object GC using DTrace.
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* Written for the JavaScript DTrace provider.
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*
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* $Id: js_objgc.d 63 2007-10-04 04:34:38Z brendan $
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*
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* This traces JavaScript activity from all running browers on the system
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* which support the JavaScript DTrace provider.
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*
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* USAGE: js_objgc.d # hit Ctrl-C to end
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*
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* FIELDS:
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* FILE Filename that contained the function
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* CLASS Class to which this new object belongs
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* TOTAL Object entropy (positive == uncollected)
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*
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* This script provides information on which objects are not being garbage
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* collected, an issue which causes the browser to steadily leak memory.
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* We trace object creation (+1) and destruction (-1), and provide a
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* summary each second of the running tally of the object class and
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* originating filename. If over the period of several minutes an object
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* type is still steadily increasing, then that would be of interest.
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* Be patient, depending on the rate of object creation it can take over
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* ten minutes for garbage collect to kick in.
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*
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* NOTES:
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* - it is possible that you will see negative entropy. That happens
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* when you begin tracing after some objects have already been created,
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* and then trace their destruction.
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* - there are other Things that GC handles, other than Objects; extra
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* probes can be added to trace them, should the need arise.
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*
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* COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
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*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at Docs/cddl1.txt
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* CDDL HEADER END
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*
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* 09-Sep-2007 Brendan Gregg Created this.
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*/
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/* if you get dynvardrops, increase this, */
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#pragma D option dynvarsize=32m
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#pragma D option quiet
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dtrace:::BEGIN
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{
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printf("Tracing... Hit Ctrl-C to end.\n");
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}
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javascript*:::object-create
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/arg2/
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{
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this->file = basename(copyinstr(arg0));
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@objs[this->file, copyinstr(arg1)] = sum(1);
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filename[arg2] = this->file;
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}
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javascript*:::object-finalize
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/filename[arg2] == NULL/
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{
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@objs["<missed>", copyinstr(arg1)] = sum(-1);
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}
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javascript*:::object-finalize
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/filename[arg2] != NULL/
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{
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@objs[filename[arg2], copyinstr(arg1)] = sum(-1);
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filename[arg2] = 0;
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}
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profile:::tick-1sec,
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dtrace:::END
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{
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printf("\n %-24s %8s %-20s %23Y\n", "FILE", "TOTAL", "CLASS",
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walltimestamp);
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printa(" %-24.24s %@8d %s\n", @objs);
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}
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