#!/usr/sbin/dtrace -Zs
/*
* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
*/
/*
* Usage:
* 1. object_allocation_stat.d -c "java ..." TOP_RESULTS_COUNT INTERVAL_SECS
* 2. object_allocation_stat.d -p JAVA_PID TOP_RESULTS_COUNT INTERVAL_SECS
*
* This script collects statistics about TOP_RESULTS_COUNT (default is 25)
* object allocations every INTERVAL_SECS (default is 60) seconds.
*
* The results are displayed in ascending order which means that the highest
* allocated type is listed last. The script can be improved to sort the
* results in reverse order when DTrace supports it.
*
* Notes:
* - The object-alloc probe is disabled by default since it incurs
* performance overhead to the application. To trace object-alloc probe,
* you need to turn on the ExtendedDTraceProbes VM option.
* You can either start the application with -XX:+ExtendedDTraceProbes
* option or use the jinfo command to enable it at runtime as follows:
*
* jinfo -flag +ExtendedDTraceProbes <java_pid>
*
*/
#pragma D option quiet
#pragma D option destructive
#pragma D option defaultargs
#pragma D option bufsize=16m
#pragma D option aggrate=100ms
self char *str_ptr;
self string class_name;
long long ALLOCATED_OBJECTS_CNT;
int INTERVAL_SECS;
:::BEGIN
{
SAMPLE_NAME = "hotspot object allocation tracing";
TOP_RESULTS_COUNT = $1 ? $1 : 25;
INTERVAL_SECS = $2 ? $2 : 60;
ALLOCATED_OBJECTS_CNT = 0;
SAMPLING_TIME = timestamp + INTERVAL_SECS * 1000000000ull;
LINE_SEP =
"------------------------------------------------------------------------";
printf("BEGIN %s\n\n", SAMPLE_NAME);
}
/*
* hotspot:::object-alloc probe arguments:
* arg0: uintptr_t, Java thread id
* arg1: char*, a pointer to mUTF-8 string containing the name of
* the class of the object being allocated
* arg2: uintptr_t, the length of the class name (in bytes)
* arg3: uintptr_t, the size of the object being allocated
*/
hotspot$target:::object-alloc
{
ALLOCATED_OBJECTS_CNT ++;
self->str_ptr = (char*) copyin(arg1, arg2+1);
self->str_ptr[arg2] = '\0';
self->class_name = (string) self->str_ptr;
@allocs_count[self->class_name] = count();
@allocs_size[self->class_name] = sum(arg3);
}
tick-1sec
/timestamp > SAMPLING_TIME/
{
printf("\n");
printf("%s\n", LINE_SEP);
printf("%Y\n", walltimestamp);
printf("%s\n", LINE_SEP);
printf("\n");
printf("Top %d allocations by size:\n", TOP_RESULTS_COUNT);
trunc(@allocs_size, TOP_RESULTS_COUNT);
printa("%10@d %s\n", @allocs_size);
printf("\n");
printf("Top %d allocations by count:\n", TOP_RESULTS_COUNT);
trunc(@allocs_count, TOP_RESULTS_COUNT);
printa("%10@d %s\n", @allocs_count);
printf("\nTotal number of allocated objects: %d\n", ALLOCATED_OBJECTS_CNT);
SAMPLING_TIME = timestamp + INTERVAL_SECS * 1000000000ull;
}
:::END
{
printf("\n");
printf("%s\n", LINE_SEP);
printf("%Y\n", walltimestamp);
printf("%s\n", LINE_SEP);
printf("\n");
printf("Top %d allocations by size:\n", TOP_RESULTS_COUNT);
trunc(@allocs_size, TOP_RESULTS_COUNT);
printa("%10@d %s\n", @allocs_size);
printf("\n");
printf("Top %d allocations by count:\n", TOP_RESULTS_COUNT);
trunc(@allocs_count, TOP_RESULTS_COUNT);
printa("%10@d %s\n", @allocs_count);
printf("\nTotal number of allocated objects: %d\n", ALLOCATED_OBJECTS_CNT);
printf("\nEND of %s\n", SAMPLE_NAME);
}
syscall::rexit:entry,
syscall::exit:entry
/pid == $target/
{
exit(0);
}