1 files changed, 95 insertions, 0 deletions
diff --git a/src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/sched/whoqueue.d b/src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/sched/whoqueue.d
new file mode 100644
index 00000000..c2ab47a3
--- /dev/null
+++ b/src/VBox/ExtPacks/VBoxDTrace/onnv/cmd/dtrace/demo/sched/whoqueue.d
@@ -0,0 +1,95 @@
+/*
+ * 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 usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma D option quiet
+#pragma D option nspec=4
+#pragma D option specsize=100k
+
+int maxlen;
+int spec[int];
+
+sched:::enqueue
+{
+	this->len = ++qlen[this->cpu = args[2]->cpu_id];
+	in[args[0]->pr_addr] = timestamp;
+}
+
+sched:::enqueue
+/this->len > maxlen && spec[this->cpu]/
+{
+	/*
+	 * There is already a speculation for this CPU.  We just set a new
+	 * record, so we'll discard the old one.
+	 */
+	discard(spec[this->cpu]);
+}
+
+sched:::enqueue
+/this->len > maxlen/
+{
+	/*
+	 * We have a winner.  Set the new maximum length and set the timestamp
+	 * of the longest length.
+	 */
+	maxlen = this->len;
+	longtime[this->cpu] = timestamp;	
+
+	/*
+	 * Now start a new speculation, and speculatively trace the length.
+	 */
+	this->spec = spec[this->cpu] = speculation();
+	speculate(this->spec);
+	printf("Run queue of length %d:\n", this->len);
+}
+
+sched:::dequeue
+/(this->in = in[args[0]->pr_addr]) &&
+    this->in <= longtime[this->cpu = args[2]->cpu_id]/
+{
+	speculate(spec[this->cpu]);
+	printf("  %d/%d (%s)\n", 
+	    args[1]->pr_pid, args[0]->pr_lwpid,
+	    stringof(args[1]->pr_fname));
+}
+
+sched:::dequeue
+/qlen[args[2]->cpu_id]/
+{
+	in[args[0]->pr_addr] = 0;
+	this->len = --qlen[args[2]->cpu_id];
+}
+
+sched:::dequeue
+/this->len == 0 && spec[this->cpu]/
+{
+	/*
+	 * We just processed the last thread that was enqueued at the time
+	 * of longest length; commit the speculation, which by now contains
+	 * each thread that was enqueued when the queue was longest.
+	 */
+	commit(spec[this->cpu]);
+	spec[this->cpu] = 0;
+}