usr/src/cmd/dtrace/test/tst/common/misc/tst.dofmax.ksh

   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 (the "License").
   6 # You may not use this file except in compliance with the License.
   7 #
   8 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9 # or http://www.opensolaris.org/os/licensing.
  10 # See the License for the specific language governing permissions
  11 # and limitations under the License.
  12 #
  13 # When distributing Covered Code, include this CDDL HEADER in each
  14 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15 # If applicable, add the following below this CDDL HEADER, with the
  16 # fields enclosed by brackets "[]" replaced with your own identifying
  17 # information: Portions Copyright [yyyy] [name of copyright owner]
  18 #
  19 # CDDL HEADER END
  20 #
  21
  22 #
  23 # Copyright (c) 2012, Joyent, Inc. All rights reserved.
  24 #
  25
  26 let j=8
  27
  28 enable()
  29 {
  30         prog=/var/tmp/dtest.$$.d
  31         err=/var/tmp/dtest.$$.err
  32
  33         nawk -v nprobes=$1 'BEGIN { \
  34                 for (i = 0; i < nprobes - 1; i++) {             \
  35                         printf("dtrace:::BEGIN,\n");            \
  36                 }                                               \
  37                                                                 \
  38                 printf("dtrace:::BEGIN { exit(0); }\n");        \
  39         }' /dev/null > $prog
  40
  41         dtrace -qs $prog > /dev/null 2> $err
  42
  43         if [[ "$?" -eq 0 ]]; then
  44                 return 0
  45         else
  46                 if ! grep "DIF program exceeds maximum program size" $err \
  47                     1> /dev/null 2>&1 ; then
  48                         echo "failed to enable $prog: `cat $err`"
  49                         exit 1
  50                 fi
  51
  52                 return 1
  53         fi
  54 }
  55
  56 #
  57 # First, establish an upper bound
  58 #
  59 let upper=1
  60
  61 while enable $upper ; do
  62         let lower=upper
  63         let upper=upper+upper
  64         echo success at $lower, raised to $upper
  65 done
  66
  67 #
  68 # Now search for the highest value that can be enabled
  69 #
  70 while [[ "$lower" -lt "$upper" ]]; do
  71         let guess=$(((lower + upper) / 2))
  72         echo "lower is $lower; upper is $upper; guess is $guess\c"
  73
  74         if enable $guess ; then
  75                 if [[ $((upper - lower)) -le 2 ]]; then
  76                         let upper=guess
  77                 fi
  78
  79                 echo " (success)"
  80                 let lower=guess
  81         else
  82                 echo " (failure)"
  83                 let upper=guess
  84         fi
  85 done
  86
  87 let expected=10000
  88
  89 if [[ "$lower" -lt "$expected" ]]; then
  90         echo "expected support for enablings of at least $expected probes; \c"
  91         echo "found $lower"
  92         exit 1
  93 fi
  94
  95 echo "maximum supported enabled probes found to be $lower"
  96 exit 0
  97