1 #!/usr/sbin/dtrace -CZs
2 /*
3  * j_calldist.d - measure Java elapsed times for different types of operation.
4  *                Written for the Java hotspot DTrace provider.
5  *
6  * $Id: j_calldist.d,v 1.1.1.1 2015/09/30 22:01:06 christos Exp $
7  *
8  * This traces activity from all Java processes on the system with hotspot
9  * provider support (1.6.0). Method calls are only visible when using the
10  * flag "+ExtendedDTraceProbes". eg, java -XX:+ExtendedDTraceProbes classfile
11  *
12  * USAGE: j_calldist.d [top]	# hit Ctrl-C to end
13  *
14  * The "top" optional argument will truncate the output for each report
15  * section to that many lines, with a default of 10.
16  *
17  * FIELDS:
18  *		1		Process ID
19  *		2		Type of call (method/gc)
20  *		3		Name of call
21  *
22  * COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
23  *
24  * CDDL HEADER START
25  *
26  *  The contents of this file are subject to the terms of the
27  *  Common Development and Distribution License, Version 1.0 only
28  *  (the "License").  You may not use this file except in compliance
29  *  with the License.
30  *
31  *  You can obtain a copy of the license at Docs/cddl1.txt
32  *  or http://www.opensolaris.org/os/licensing.
33  *  See the License for the specific language governing permissions
34  *  and limitations under the License.
35  *
36  * CDDL HEADER END
37  *
38  * 09-Sep-2007	Brendan Gregg	Created this.
39  */
40 
41 #define TOP	10		/* default output truncation */
42 #define B_FALSE	0
43 
44 #pragma D option quiet
45 #pragma D option defaultargs
46 
47 dtrace:::BEGIN
48 {
49 	printf("Tracing... Hit Ctrl-C to end.\n");
50 	top = $1 != 0 ? $1 : TOP;
51 }
52 
53 hotspot*:::method-entry
54 {
55 	self->depth[arg0]++;
56 	self->exclude[arg0, self->depth[arg0]] = 0;
57 	self->method[arg0, self->depth[arg0]] = timestamp;
58 }
59 
60 hotspot*:::method-return
61 /self->method[arg0, self->depth[arg0]]/
62 {
63 	this->elapsed_incl = timestamp - self->method[arg0, self->depth[arg0]];
64 	this->elapsed_excl = this->elapsed_incl -
65 	    self->exclude[arg0, self->depth[arg0]];
66 	self->method[arg0, self->depth[arg0]] = 0;
67 	self->exclude[arg0, self->depth[arg0]] = 0;
68 
69 	this->class = (char *)copyin(arg1, arg2 + 1);
70 	this->class[arg2] = '\0';
71 	this->method = (char *)copyin(arg3, arg4 + 1);
72 	this->method[arg4] = '\0';
73 	this->name = strjoin(strjoin(stringof(this->class), "."),
74 	    stringof(this->method));
75 
76 	@types_incl[pid, "method", this->name] =
77 	    quantize(this->elapsed_incl / 1000);
78 	@types_excl[pid, "method", this->name] =
79 	    quantize(this->elapsed_excl / 1000);
80 
81 	self->depth[arg0]--;
82 	self->exclude[arg0, self->depth[arg0]] += this->elapsed_incl;
83 }
84 
85 hotspot*:::gc-begin
86 {
87 	self->gc = timestamp;
88 	self->full = (boolean_t)arg0;
89 }
90 
91 hotspot*:::gc-end
92 /self->gc/
93 {
94 	this->elapsed = timestamp - self->gc;
95 
96 	@types[pid, "gc", self->full == B_FALSE ? "GC" : "Full GC"] =
97 	    quantize(this->elapsed / 1000);
98 
99 	self->gc = 0;
100 	self->full = 0;
101 }
102 
103 dtrace:::END
104 {
105 	trunc(@types, top);
106 	printf("\nTop %d elapsed times (us),\n", top);
107 	printa("   PID=%d, %s, %s %@d\n", @types);
108 
109 	trunc(@types_excl, top);
110 	printf("\nTop %d exclusive method elapsed times (us),\n", top);
111 	printa("   PID=%d, %s, %s %@d\n", @types_excl);
112 
113 	trunc(@types_incl, top);
114 	printf("\nTop %d inclusive method elapsed times (us),\n", top);
115 	printa("   PID=%d, %s, %s %@d\n", @types_incl);
116 }
117