1#!/bin/sh 2 3# 4# Copyright (c) 2017 Dell EMC Isilon 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# Verify that vm_fault_dontneed() is called during sequential access of a 30# mapped file on a file system. 31 32# Test scenario description by alc@ 33 34. ../default.cfg 35[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 36dtrace -n 'dtrace:::BEGIN { exit(0); }' > /dev/null 2>&1 || exit 0 37 38dir=/tmp 39odir=`pwd` 40cd $dir 41sed '1,/^EOF/d' < $odir/$0 > $dir/vm_fault_dontneed.c 42mycc -o vm_fault_dontneed -Wall -Wextra -O0 -g vm_fault_dontneed.c || exit 1 43rm -f vm_fault_dontneed.c 44cd $odir 45 46size=$((`sysctl -n hw.physmem` / 1024 / 1024)) 47[ $size -gt $((2 * 1024)) ] && 48 { echo "RAM must be capped to 2GB for this test." 49 rm /tmp/vm_fault_dontneed; exit 0; } 50need=2048 51have=`df -k $(dirname $diskimage) | tail -1 | awk '{print int($4 / 1024)}'` 52[ $need -gt $have ] && need=$((have - 1)) 53dd if=/dev/zero of=$diskimage bs=1m count=$need status=none 54 55log=/tmp/dtrace.$$ 56trap "rm -f $log" EXIT INT 57dtrace -w -n '::*vm_fault_dontneed:entry { @[execname] = count(); }' \ 58-c "/tmp/vm_fault_dontneed $diskimage" > $log 2>&1 59 60count=`grep vm_fault_dontneed $log | awk 'NF == 2 {print $NF}'` 61[ -z "$count" ] && count=0 62[ $count -lt 1000 ] && 63 { echo "vm_fault_dontneed count = $count"; s=1; cat $log; } 64 65rm -rf /tmp/vm_fault_dontneed $diskimage 66exit $s 67 68EOF 69#include <sys/types.h> 70#include <sys/mman.h> 71#include <sys/stat.h> 72 73#include <err.h> 74#include <fcntl.h> 75#include <stdio.h> 76#include <unistd.h> 77 78int 79main(int argc __unused, char **argv) 80{ 81 struct stat fs; 82 off_t i; 83 char *ptr; 84 int accum, fd; 85 86 fd = open(argv[1], O_RDONLY); 87 if (fd == -1) 88 err(1, "open"); 89 if (fstat(fd, &fs) == -1 || !S_ISREG(fs.st_mode)) 90 err(1, "fstat"); 91 ptr = mmap(0, (size_t)fs.st_size, PROT_READ /*| PROT_EXEC*/, MAP_PRIVATE, fd, 0); 92 if (ptr == MAP_FAILED) 93 err(1, "mmap"); 94 accum = 0; 95 for (i = 0; i < fs.st_size; i++) 96 accum += ptr[i]; 97 if (accum != 0) /* just to trick the optimizer */ 98 printf("accum: %d\nptr: %p\nsize: %ld\n", accum, ptr, (long)fs.st_size); 99} 100