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#!/usr/sbin/dtrace -CZs
/*
* j_calldist.d - measure Java elapsed times for different types of operation.
* Written for the Java hotspot DTrace provider.
*
* $Id: j_calldist.d 59 2007-10-03 08:21:58Z brendan $
*
* This traces activity from all Java processes on the system with hotspot
* provider support (1.6.0). Method calls are only visible when using the
* flag "+ExtendedDTraceProbes". eg, java -XX:+ExtendedDTraceProbes classfile
*
* USAGE: j_calldist.d [top] # hit Ctrl-C to end
*
* The "top" optional argument will truncate the output for each report
* section to that many lines, with a default of 10.
*
* FIELDS:
* 1 Process ID
* 2 Type of call (method/gc)
* 3 Name of call
*
* 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.
*/
#define TOP 10 /* default output truncation */
#define B_FALSE 0
#pragma D option quiet
#pragma D option defaultargs
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
top = $1 != 0 ? $1 : TOP;
}
hotspot*:::method-entry
{
self->depth[arg0]++;
self->exclude[arg0, self->depth[arg0]] = 0;
self->method[arg0, self->depth[arg0]] = timestamp;
}
hotspot*:::method-return
/self->method[arg0, self->depth[arg0]]/
{
this->elapsed_incl = timestamp - self->method[arg0, self->depth[arg0]];
this->elapsed_excl = this->elapsed_incl -
self->exclude[arg0, self->depth[arg0]];
self->method[arg0, self->depth[arg0]] = 0;
self->exclude[arg0, self->depth[arg0]] = 0;
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));
@types_incl[pid, "method", this->name] =
quantize(this->elapsed_incl / 1000);
@types_excl[pid, "method", this->name] =
quantize(this->elapsed_excl / 1000);
self->depth[arg0]--;
self->exclude[arg0, self->depth[arg0]] += this->elapsed_incl;
}
hotspot*:::gc-begin
{
self->gc = timestamp;
self->full = (boolean_t)arg0;
}
hotspot*:::gc-end
/self->gc/
{
this->elapsed = timestamp - self->gc;
@types[pid, "gc", self->full == B_FALSE ? "GC" : "Full GC"] =
quantize(this->elapsed / 1000);
self->gc = 0;
self->full = 0;
}
dtrace:::END
{
trunc(@types, top);
printf("\nTop %d elapsed times (us),\n", top);
printa(" PID=%d, %s, %s %@d\n", @types);
trunc(@types_excl, top);
printf("\nTop %d exclusive method elapsed times (us),\n", top);
printa(" PID=%d, %s, %s %@d\n", @types_excl);
trunc(@types_incl, top);
printf("\nTop %d inclusive method elapsed times (us),\n", top);
printa(" PID=%d, %s, %s %@d\n", @types_incl);
}
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