/*
* libhugetlbfs - Easy use of Linux hugepages
* Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <hugetlbfs.h>
#include "hugetests.h"
long hpage_size;
long oc_hugepages = -1;
/* Restore nr_overcommit_hugepages */
void cleanup(void)
{
if (oc_hugepages != -1)
set_nr_overcommit_hugepages(hpage_size, oc_hugepages);
}
/* Confirm a region really frees, only really important for GHR_FALLBACK */
void free_and_confirm_region_free(void *p, int line) {
unsigned char vec = 0;
free_hugepage_region(p);
if (mincore(p, 4, &vec) == 0 || vec)
FAIL("free_hugepage_region did not free region at line %d", line);
}
int test_unaligned_addr_huge(void *p)
{
unsigned long long mapping_size;
p = (void *)((unsigned long)p & ~((gethugepagesize()) - 1));
mapping_size = get_mapping_page_size(p);
return (mapping_size == hpage_size);
}
#define TESTLEN ((num_hugepages - 1) * hpage_size + hpage_size / 2)
void test_GHR_STRICT(int num_hugepages)
{
int err;
void *p = get_hugepage_region(TESTLEN, GHR_DEFAULT);
if (p == NULL)
FAIL("get_hugepage_region() for %d hugepages", num_hugepages);
memset(p, 1, TESTLEN);
err = test_unaligned_addr_huge(p + (num_hugepages - 1) * hpage_size);
if (err != 1)
FAIL("Returned page is not hugepage");
free_and_confirm_region_free(p, __LINE__);
err = test_unaligned_addr_huge(p);
if (err == 1)
FAIL("hugepage was not correctly freed");
}
void test_GHR_FALLBACK(void)
{
int err;
long rsvd_hugepages = get_huge_page_counter(hpage_size, HUGEPAGES_RSVD);
long num_hugepages = get_huge_page_counter(hpage_size, HUGEPAGES_TOTAL)
- rsvd_hugepages;
/* We must disable overcommitted huge pages to test this */
oc_hugepages = get_huge_page_counter(hpage_size, HUGEPAGES_OC);
set_nr_overcommit_hugepages(hpage_size, 0);
/* We should be able to allocate the whole pool */
void *p = get_hugepage_region(TESTLEN, GHR_DEFAULT);
if (p == NULL)
FAIL("test_GHR_FALLBACK(GHR_DEFAULT) failed for %ld hugepages",
num_hugepages);
memset(p, 1, TESTLEN);
err = test_unaligned_addr_huge(p + (num_hugepages - 1) * hpage_size);
if (err != 1)
FAIL("Returned page is not hugepage");
free_and_confirm_region_free(p, __LINE__);
/* We should fail allocating too much */
num_hugepages++;
p = get_hugepage_region(TESTLEN, GHR_STRICT);
if (p != NULL)
FAIL("test_GHR_FALLBACK() for %ld expected fail, got success", num_hugepages);
/* GHR_FALLBACK should succeed by allocating base pages */
p = get_hugepage_region(TESTLEN, GHR_FALLBACK);
if (p == NULL)
FAIL("test_GHR_FALLBACK(GHR_FALLBACK) failed for %ld hugepages",
num_hugepages);
memset(p, 1, TESTLEN);
err = test_unaligned_addr_huge(p + (num_hugepages - 1) * hpage_size);
if (err == 1)
FAIL("Returned page is not a base page");
/*
* We allocate a second fallback region to see can they be told apart
* on free. Merging VMAs would cause problems
*/
void *pb = get_hugepage_region(TESTLEN, GHR_FALLBACK);
if (pb == NULL)
FAIL("test_GHR_FALLBACK(GHR_FALLBACK) x2 failed for %ld hugepages",
num_hugepages);
memset(pb, 1, TESTLEN);
free_and_confirm_region_free(pb, __LINE__);
free_and_confirm_region_free(p, __LINE__);
}
int main(int argc, char *argv[])
{
test_init(argc, argv);
hpage_size = gethugepagesize();
check_free_huge_pages(4);
test_GHR_STRICT(1);
test_GHR_STRICT(4);
test_GHR_FALLBACK();
PASS();
}