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#!/usr/sbin/dtrace -Zs
/*
* j_calls.d - count Java calls (method/...) using DTrace.
* Written for the Java hotspot DTrace provider.
*
* $Id: j_calls.d 19 2007-09-12 07:47:59Z brendan $
*
* This traces activity from all Java processes on the system with hotspot
* provider support (1.6.0). Method calls and object allocation are only
* visible when using the flag "+ExtendedDTraceProbes". eg,
* java -XX:+ExtendedDTraceProbes classfile
*
* USAGE: j_calls.d # hit Ctrl-C to end
*
* FIELDS:
* PID Process ID
* TYPE Type of call (see below)
* NAME Name of call
* COUNT Number of calls during sample
*
* TYPEs:
* cload class load
* method method call
* mcompile method compile
* mload compiled method load
* oalloc object alloc
* thread thread start
*
* 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.
*/
#pragma D option quiet
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
}
hotspot*:::method-entry
{
this->class = (char *)copyin(arg1, arg2 + 1);
this->class[arg2] = '\0';
this->method = (char *)copyin(arg3, arg4 + 1);
this->method[arg4] = '\0';
this->name = strjoin(strjoin(stringof(this->class), "."),
stringof(this->method));
@calls[pid, "method", this->name] = count();
}
hotspot*:::object-alloc
{
this->class = (char *)copyin(arg1, arg2 + 1);
this->class[arg2] = '\0';
@calls[pid, "oalloc", stringof(this->class)] = count();
}
hotspot*:::class-loaded
{
this->class = (char *)copyin(arg0, arg1 + 1);
this->class[arg1] = '\0';
@calls[pid, "cload", stringof(this->class)] = count();
}
hotspot*:::thread-start
{
this->thread = (char *)copyin(arg0, arg1 + 1);
this->thread[arg1] = '\0';
@calls[pid, "thread", stringof(this->thread)] = count();
}
hotspot*:::method-compile-begin
{
this->class = (char *)copyin(arg0, arg1 + 1);
this->class[arg1] = '\0';
this->method = (char *)copyin(arg2, arg3 + 1);
this->method[arg3] = '\0';
this->name = strjoin(strjoin(stringof(this->class), "."),
stringof(this->method));
@calls[pid, "mcompile", this->name] = count();
}
hotspot*:::compiled-method-load
{
this->class = (char *)copyin(arg0, arg1 + 1);
this->class[arg1] = '\0';
this->method = (char *)copyin(arg2, arg3 + 1);
this->method[arg3] = '\0';
this->name = strjoin(strjoin(stringof(this->class), "."),
stringof(this->method));
@calls[pid, "mload", this->name] = count();
}
dtrace:::END
{
printf(" %6s %-8s %-52s %8s\n", "PID", "TYPE", "NAME", "COUNT");
printa(" %6d %-8s %-52s %@8d\n", @calls);
}
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