121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2004
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* Copyright (c) Linux Test Project, 2004-2017
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*
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* Test Name: hugemmap04
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*
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* Test Description:
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* Verify that, a hugetlb mmap() succeeds when used to map the largest
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* size possible.
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*
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* Expected Result:
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* mmap() should succeed returning the address of the hugetlb mapped region.
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* The number of free huge pages should decrease.
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*
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* Test:
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* Loop if the proper options are given.
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* Execute system call
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* Check return code, if system call failed (return=-1)
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* Log the errno and Issue a FAIL message.
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*
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* HISTORY
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* 04/2004 Written by Robbie Williamson
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*/
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#include <sys/mount.h>
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#include <stdio.h>
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#include <limits.h>
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#include <sys/param.h>
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#include "lapi/abisize.h"
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#include "hugetlb.h"
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static char TEMPFILE[MAXPATHLEN];
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static long *addr;
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static long long mapsize;
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static int fildes;
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static long freepages;
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static long beforetest;
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static long aftertest;
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static long hugepagesmapped;
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static void test_hugemmap(void)
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{
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int huge_pagesize = 0;
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/* Creat a temporary file used for huge mapping */
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fildes = SAFE_OPEN(TEMPFILE, O_RDWR | O_CREAT, 0666);
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freepages = SAFE_READ_MEMINFO("HugePages_Free:");
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beforetest = freepages;
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huge_pagesize = SAFE_READ_MEMINFO("Hugepagesize:");
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tst_res(TINFO, "Size of huge pages is %d KB", huge_pagesize);
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#ifdef TST_ABI32
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tst_res(TINFO, "Total amount of free huge pages is %ld",
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freepages);
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tst_res(TINFO, "Max number allowed for 1 mmap file in"
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" 32-bits is 128");
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if (freepages > 128)
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freepages = 128;
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#endif
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mapsize = (long long)freepages * huge_pagesize * 1024;
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addr = mmap(NULL, mapsize, PROT_READ | PROT_WRITE,
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MAP_SHARED, fildes, 0);
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if (addr == MAP_FAILED) {
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tst_res(TFAIL | TERRNO, "mmap() Failed on %s",
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TEMPFILE);
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} else {
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tst_res(TPASS,
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"Succeeded mapping file using %ld pages",
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freepages);
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/* force to allocate page and change HugePages_Free */
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*(int *)addr = 0;
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/* Make sure the number of free huge pages AFTER testing decreased */
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aftertest = SAFE_READ_MEMINFO("HugePages_Free:");
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hugepagesmapped = beforetest - aftertest;
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if (hugepagesmapped < 1)
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tst_res(TWARN, "Number of HUGEPAGES_FREE stayed the"
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" same. Okay if multiple copies running due"
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" to test collision.");
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}
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munmap(addr, mapsize);
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close(fildes);
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}
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void setup(void)
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{
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if (tst_hugepages == 0)
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tst_brk(TCONF, "Not enough hugepages for testing!");
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if (!Hopt)
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Hopt = tst_get_tmpdir();
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SAFE_MOUNT("none", Hopt, "hugetlbfs", 0, NULL);
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snprintf(TEMPFILE, sizeof(TEMPFILE), "%s/mmapfile%d", Hopt, getpid());
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}
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void cleanup(void)
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{
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unlink(TEMPFILE);
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umount(Hopt);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.needs_tmpdir = 1,
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.options = (struct tst_option[]) {
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{"H:", &Hopt, "-H /.. Location of hugetlbfs, i.e. -H /var/hugetlbfs"},
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{"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
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{}
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},
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.setup = setup,
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.cleanup = cleanup,
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.test_all = test_hugemmap,
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.request_hugepages = 128,
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};
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