1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5# 6# Copyright (c) 2018 Konstantin Belousov <kib@FreeBSD.org> 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# Demonstrate superpage mapping. 31 32cat > /tmp/shm_super.c <<EOF 33/* $Id: shm_super.c,v 1.1 2018/10/13 23:49:37 kostik Exp kostik $ */ 34 35#include <sys/param.h> 36#include <sys/mman.h> 37#include <err.h> 38#include <fcntl.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#include <unistd.h> 43 44#define M(x) ((x) * 1024 * 1024) 45#define SZ M(4) 46 47int 48main(void) 49{ 50 char buf[128]; 51 void *ptr; 52 off_t cnt; 53 int error, shmfd; 54 55 shmfd = shm_open(SHM_ANON, O_CREAT | O_RDWR, 0600); 56 if (shmfd == -1) 57 err(1, "shm_open"); 58 error = ftruncate(shmfd, SZ); 59 if (error == -1) 60 err(1, "truncate"); 61 memset(buf, 0, sizeof(buf)); 62 for (cnt = 0; cnt < SZ; cnt += sizeof(buf)) { 63 error = write(shmfd, buf, sizeof(buf)); 64 if (error == -1) 65 err(1, "write"); 66 else if (error != sizeof(buf)) 67 errx(1, "short write %d", (int)error); 68 } 69 ptr = mmap(NULL, SZ, PROT_READ | PROT_WRITE, MAP_SHARED | 70 MAP_ALIGNED_SUPER, shmfd, 0); 71 if (ptr == MAP_FAILED) 72 err(1, "mmap"); 73 for (cnt = 0; cnt < SZ; cnt += PAGE_SIZE) 74 *((char *)ptr + cnt) = 0; 75 printf("ptr %p\n", ptr); 76 snprintf(buf, sizeof(buf), "procstat -v %d", getpid()); 77 system(buf); 78} 79EOF 80cc -o /tmp/shm_super -Wall -Wextra -O2 -g /tmp/shm_super.c || exit 1 81rm /tmp/shm_super.c 82 83/tmp/shm_super > /tmp/shm_super.log 2>&1 84grep -wq S /tmp/shm_super.log && s=0 || { cat /tmp/shm_super.log; s=1; } 85 86rm -f /tmp/shm_super /tmp/shm_super.log 87exit $s 88