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+#!/usr/sbin/dtrace -Zs
+/*
+ * j_flowtime.d - snoop Java execution with method flow and delta times.
+ * Written for the Java hotspot DTrace provider.
+ *
+ * $Id: j_flowtime.d 41 2007-09-17 02:20:10Z brendan $
+ *
+ * This traces activity from all Java processes on the system with hotspot
+ * provider support (1.6.0) and the flag "+ExtendedDTraceProbes". eg,
+ * java -XX:+ExtendedDTraceProbes classfile
+ *
+ * USAGE: j_flowtime.d # hit Ctrl-C to end
+ *
+ * This watches Java method entries and returns, and indents child
+ * method calls.
+ *
+ * FIELDS:
+ * C CPU-id
+ * PID Process ID
+ * TID Thread ID
+ * TIME(us) Time since boot (us)
+ * DELTA(us) Elapsed time from previous line to this line
+ * CLASS.METHOD Java class and method name
+ *
+ * LEGEND:
+ * -> method entry
+ * <- method return
+ *
+ * WARNING: Watch the first column carefully, it prints the CPU-id. If it
+ * changes, then it is very likely that the output has been shuffled.
+ * Changes in TID will appear to shuffle output, as we change from one thread
+ * depth to the next. See Docs/Notes/ALLjavaflow.txt for additional notes.
+ *
+ * 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.
+ */
+
+/* increasing bufsize can reduce drops */
+#pragma D option bufsize=16m
+#pragma D option quiet
+#pragma D option switchrate=10
+
+self int depth[int];
+
+dtrace:::BEGIN
+{
+ printf("%3s %6s/%-5s %-16s %9s -- %s\n", "C", "PID", "TID", "TIME(us)",
+ "DELTA(us)", "CLASS.METHOD");
+}
+
+hotspot*:::method-entry,
+hotspot*:::method-return
+/self->last == 0/
+{
+ self->last = timestamp;
+}
+
+hotspot*:::method-entry
+{
+ this->delta = (timestamp - self->last) / 1000;
+ this->class = (char *)copyin(arg1, arg2 + 1);
+ this->class[arg2] = '\0';
+ this->method = (char *)copyin(arg3, arg4 + 1);
+ this->method[arg4] = '\0';
+
+ printf("%3d %6d/%-5d %-16d %9d %*s-> %s.%s\n", cpu, pid, tid,
+ timestamp / 1000, this->delta, self->depth[arg0] * 2, "",
+ stringof(this->class), stringof(this->method));
+ self->depth[arg0]++;
+ self->last = timestamp;
+}
+
+hotspot*:::method-return
+{
+ this->delta = (timestamp - self->last) / 1000;
+ this->class = (char *)copyin(arg1, arg2 + 1);
+ this->class[arg2] = '\0';
+ this->method = (char *)copyin(arg3, arg4 + 1);
+ this->method[arg4] = '\0';
+
+ self->depth[arg0] -= self->depth[arg0] > 0 ? 1 : 0;
+ printf("%3d %6d/%-5d %-16d %9d %*s<- %s.%s\n", cpu, pid, tid,
+ timestamp / 1000, this->delta, self->depth[arg0] * 2, "",
+ stringof(this->class), stringof(this->method));
+ self->last = timestamp;
+}