101 lines
2.7 KiB
D
Executable File
101 lines
2.7 KiB
D
Executable File
#!/usr/sbin/dtrace -Zs
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/*
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* j_classflow.d - trace a Java class method flow using DTrace.
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* Written for the Java hotspot DTrace provider.
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*
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* $Id: j_classflow.d 63 2007-10-04 04:34:38Z brendan $
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*
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* This traces activity from all Java processes on the system with hotspot
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* provider support (1.6.0) and the flag "+ExtendedDTraceProbes". eg,
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* java -XX:+ExtendedDTraceProbes classfile
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*
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* USAGE: j_classflow.d classname # hit Ctrl-C to end
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*
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* This watches Java method entries and returns, and indents child
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* method calls.
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*
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* FIELDS:
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* C CPU-id
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* TIME(us) Time since boot, us
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* PID Process ID
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* CLASS.METHOD Java class and method name
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*
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* LEGEND:
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* -> method entry
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* <- method return
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*
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* WARNING: Watch the first column carefully, it prints the CPU-id. If it
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* changes, then it is very likely that the output has been shuffled.
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* Changes in TID will appear to shuffle output, as we change from one thread
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* depth to the next. See Docs/Notes/ALLjavaflow.txt for additional notes.
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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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/* increasing bufsize can reduce drops */
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#pragma D option bufsize=16m
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#pragma D option quiet
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#pragma D option defaultargs
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#pragma D option switchrate=10
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self int depth[int];
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dtrace:::BEGIN
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/$$1 == ""/
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{
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printf("USAGE: j_classflow.d classname\n");
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exit(1);
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}
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dtrace:::BEGIN
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{
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printf("%3s %6s %-16s -- %s\n", "C", "PID", "TIME(us)", "CLASS.METHOD");
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}
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hotspot*:::method-entry,
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hotspot*:::method-return
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{
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this->class = stringof((char *)copyin(arg1, arg2 + 1));
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this->class[arg2] = '\0';
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}
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hotspot*:::method-entry
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/this->class == $$1/
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{
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this->method = (char *)copyin(arg3, arg4 + 1);
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this->method[arg4] = '\0';
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printf("%3d %6d %-16d %*s-> %s.%s\n", cpu, pid, timestamp / 1000,
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self->depth[arg0] * 2, "", stringof(this->class),
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stringof(this->method));
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self->depth[arg0]++;
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}
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hotspot*:::method-return
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/this->class == $$1/
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{
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this->method = (char *)copyin(arg3, arg4 + 1);
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this->method[arg4] = '\0';
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self->depth[arg0] -= self->depth[arg0] > 0 ? 1 : 0;
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printf("%3d %6d %-16d %*s<- %s.%s\n", cpu, pid, timestamp / 1000,
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self->depth[arg0] * 2, "", stringof(this->class),
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stringof(this->method));
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}
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