| #!/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); |
| } |