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126 lines
3.6 KiB
126 lines
3.6 KiB
7 months ago
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/* 01/02/2003 Port to LTP avenkat@us.ibm.com */
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/* 06/30/2001 Port to Linux nsharoff@us.ibm.com */
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/*
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* Copyright (c) International Business Machines Corp., 2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* as_anon_get:
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* This program tests the kernel primitive as_anon_get by using up lots of
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* level 2 page tables causing the kernel to switch to large blocks of
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* anonymous backing store allocation. This is done by allocating pages 4
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* megs apart since each pt handles 1024 pages of 4096 bytes each. Each
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* page thus requires another page table. The pages are then unmapped to
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* switch back to small swap space allocations.
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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/***** LTP Port *****/
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#include "test.h"
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#define FAILED 0
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#define PASSED 1
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int local_flag = PASSED;
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char *TCID = "mmapstress08";
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FILE *temp;
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int TST_TOTAL = 1;
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#if defined(__i386__) || defined(__x86_64__)
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int anyfail();
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void ok_exit();
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/***** ** ** *****/
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#define NPTEPG (1024)
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/*#define GRAN_NUMBER (1<<2)*/
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#define GRAN_NUMBER (1<<8)
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/* == 256 @ 4MB per mmap(2), we span a total of 1 GB */
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extern time_t time(time_t *);
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extern char *ctime(const time_t *);
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extern long sysconf(int name);
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#define ERROR(M) (void)fprintf(stderr, "%s: errno = %d: " M "\n", argv[0], \
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errno)
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/*ARGSUSED*/ int main(int argc, char *argv[])
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{
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caddr_t mmapaddr, munmap_begin;
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long pagesize = sysconf(_SC_PAGE_SIZE);
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int i;
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time_t t;
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(void)time(&t);
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//(void)printf("%s: Started %s", argv[0], ctime(&t));
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if (sbrk(pagesize - ((u_long) sbrk(0) % (u_long) pagesize)) ==
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(char *)-1) {
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ERROR("couldn't round up brk to a page boundary");
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local_flag = FAILED;
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anyfail();
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}
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/* The brk is now at the begining of a page. */
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if ((munmap_begin = mmapaddr = (caddr_t) sbrk(0)) == (caddr_t) - 1) {
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ERROR("couldn't find top of brk");
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local_flag = FAILED;
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anyfail();
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}
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/* burn level 2 ptes by spacing mmaps 4Meg apart */
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/* This should switch to large anonymous swap space granularity */
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for (i = 0; i < GRAN_NUMBER; i++) {
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if (mmap(mmapaddr, pagesize, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, 0, 0) == (caddr_t) - 1) {
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ERROR("mmap failed");
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local_flag = FAILED;
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anyfail();
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}
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mmapaddr += NPTEPG * pagesize;
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}
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/* Free bizillion level2 ptes to switch to small granularity */
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if (munmap(munmap_begin, (size_t) (mmapaddr - munmap_begin))) {
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ERROR("munmap failed");
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local_flag = FAILED;
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anyfail();
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}
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(void)time(&t);
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//(void)printf("%s: Finished %s", argv[0], ctime(&t));
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ok_exit();
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tst_exit();
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}
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/***** LTP Port *****/
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void ok_exit(void)
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{
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tst_resm(TPASS, "Test passed\n");
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tst_exit();
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}
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int anyfail(void)
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{
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tst_brkm(TFAIL, NULL, "Test failed\n");
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}
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#else /* defined(__i386__) || defined(__x86_64__) */
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int main(void)
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{
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tst_brkm(TCONF, NULL, "Test is only applicable for IA-32 and x86-64.");
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}
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#endif
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/***** ** ** *****/
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