pl_malloc.d revision 235380
1#!/usr/sbin/dtrace -Zs 2/* 3 * pl_malloc.d - Perl libc malloc analysis. 4 * Written for the Perl DTrace provider. 5 * 6 * $Id: pl_malloc.d 19 2007-09-12 07:47:59Z brendan $ 7 * 8 * This is an expiremental script to identify who is calling malloc() for 9 * memory allocation, and to print distribution plots of the requested bytes. 10 * If a malloc() occured while in a Perl subroutine, then that subroutine is 11 * identified as responsible; else the caller of malloc() is identified as 12 * responsible - which will be a function from the Perl engine. 13 * 14 * USAGE: pl_malloc.d { -p PID | -c cmd } # hit Ctrl-C to end 15 * 16 * Filename and subroutine names are printed if available. 17 * 18 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 19 * 20 * CDDL HEADER START 21 * 22 * The contents of this file are subject to the terms of the 23 * Common Development and Distribution License, Version 1.0 only 24 * (the "License"). You may not use this file except in compliance 25 * with the License. 26 * 27 * You can obtain a copy of the license at Docs/cddl1.txt 28 * or http://www.opensolaris.org/os/licensing. 29 * See the License for the specific language governing permissions 30 * and limitations under the License. 31 * 32 * CDDL HEADER END 33 * 34 * 09-Sep-2007 Brendan Gregg Created this. 35 */ 36 37#pragma D option quiet 38 39dtrace:::BEGIN 40{ 41 printf("Tracing... Hit Ctrl-C to end.\n"); 42} 43 44perl$target:::sub-entry 45{ 46 self->file = basename(copyinstr(arg1)); 47 self->name = copyinstr(arg0); 48} 49 50perl$target:::sub-return 51{ 52 self->file = 0; 53 self->name = 0; 54} 55 56pid$target:libc:malloc:entry 57/self->file != NULL/ 58{ 59 @malloc_sub_size[self->file, self->name] = sum(arg0); 60 @malloc_sub_dist[self->file, self->name] = quantize(arg0); 61} 62 63pid$target:libc:malloc:entry 64/self->name == NULL/ 65{ 66 @malloc_lib_size[usym(ucaller)] = sum(arg0); 67 @malloc_lib_dist[usym(ucaller)] = quantize(arg0); 68} 69 70 71dtrace:::END 72{ 73 printf("\nPerl malloc byte distributions by engine caller,\n\n"); 74 printa(" %A, total bytes = %@d %@d\n", @malloc_lib_size, 75 @malloc_lib_dist); 76 77 printf("\nPerl malloc byte distributions by Perl file and "); 78 printf("subroutine,\n\n"); 79 printa(" %s, %s, bytes total = %@d %@d\n", @malloc_sub_size, 80 @malloc_sub_dist); 81} 82