usr/src/cmd/dtrace/demo/struct/rwinfo.d

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 struct callinfo {
  28         uint64_t ts;      /* timestamp of last syscall entry */
  29         uint64_t elapsed; /* total elapsed time in nanoseconds */
  30         uint64_t calls;   /* number of calls made */
  31         size_t maxbytes;  /* maximum byte count argument */
  32 };
  33
  34 struct callinfo i[string];      /* declare i as an associative array */
  35
  36 syscall::read:entry, syscall::write:entry
  37 /pid == $1/
  38 {
  39         i[probefunc].ts = timestamp;
  40         i[probefunc].calls++;
  41         i[probefunc].maxbytes = arg2 > i[probefunc].maxbytes ?
  42                 arg2 : i[probefunc].maxbytes;
  43 }
  44
  45 syscall::read:return, syscall::write:return
  46 /i[probefunc].ts != 0 && pid == $1/
  47 {
  48         i[probefunc].elapsed += timestamp - i[probefunc].ts;
  49 }
  50
  51 END
  52 {
  53         printf("        calls  max bytes  elapsed nsecs\n");
  54         printf("------  -----  ---------  -------------\n");
  55         printf("  read  %5d  %9d  %d\n",
  56             i["read"].calls, i["read"].maxbytes, i["read"].elapsed);
  57         printf(" write  %5d  %9d  %d\n",
  58             i["write"].calls, i["write"].maxbytes, i["write"].elapsed);
  59 }