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 26let j=8 27 28enable() 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# 59let upper=1 60 61while enable $upper ; do 62 let lower=upper 63 let upper=upper+upper 64 echo success at $lower, raised to $upper 65done 66 67# 68# Now search for the highest value that can be enabled 69# 70while [[ "$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 [[ $((upper - lower)) -le 2 ]]; then 76 let upper=guess 77 fi 78 79 echo " (success)" 80 let lower=guess 81 else 82 echo " (failure)" 83 let upper=guess 84 fi 85done 86 87let expected=10000 88 89if [[ "$lower" -lt "$expected" ]]; then 90 echo "expected support for enablings of at least $expected probes; \c" 91 echo "found $lower" 92 exit 1 93fi 94 95echo "maximum supported enabled probes found to be $lower" 96exit 0 97 98