1 files changed, 89 insertions, 0 deletions
diff --git a/JavaScript/js_objgc.d b/JavaScript/js_objgc.d
new file mode 100755
index 000000000000..575b2952f834
--- /dev/null
+++ b/JavaScript/js_objgc.d
@@ -0,0 +1,89 @@
+#!/usr/sbin/dtrace -Zs
+/*
+ * js_objgc.d - trace JavaScript Object GC using DTrace.
+ *              Written for the JavaScript DTrace provider.
+ *
+ * $Id: js_objgc.d 63 2007-10-04 04:34:38Z brendan $
+ *
+ * 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["<missed>", 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);
+}