412 lines
10 KiB
C
412 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* hugepage-madvise:
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*
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* Basic functional testing of madvise MADV_DONTNEED and MADV_REMOVE
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* on hugetlb mappings.
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*
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* Before running this test, make sure the administrator has pre-allocated
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* at least MIN_FREE_PAGES hugetlb pages and they are free. In addition,
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* the test takes an argument that is the path to a file in a hugetlbfs
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* filesystem. Therefore, a hugetlbfs filesystem must be mounted on some
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* directory.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#define __USE_GNU
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#include <fcntl.h>
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#define USAGE "USAGE: %s <hugepagefile_name>\n"
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#define MIN_FREE_PAGES 20
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#define NR_HUGE_PAGES 10 /* common number of pages to map/allocate */
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#define validate_free_pages(exp_free) \
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do { \
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int fhp = get_free_hugepages(); \
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if (fhp != (exp_free)) { \
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printf("Unexpected number of free huge " \
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"pages line %d\n", __LINE__); \
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exit(1); \
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} \
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} while (0)
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unsigned long huge_page_size;
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unsigned long base_page_size;
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/*
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* default_huge_page_size copied from mlock2-tests.c
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*/
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unsigned long default_huge_page_size(void)
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{
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unsigned long hps = 0;
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char *line = NULL;
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size_t linelen = 0;
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FILE *f = fopen("/proc/meminfo", "r");
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if (!f)
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return 0;
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while (getline(&line, &linelen, f) > 0) {
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if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) {
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hps <<= 10;
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break;
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}
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}
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free(line);
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fclose(f);
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return hps;
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}
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unsigned long get_free_hugepages(void)
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{
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unsigned long fhp = 0;
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char *line = NULL;
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size_t linelen = 0;
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FILE *f = fopen("/proc/meminfo", "r");
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if (!f)
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return fhp;
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while (getline(&line, &linelen, f) > 0) {
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if (sscanf(line, "HugePages_Free: %lu", &fhp) == 1)
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break;
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}
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free(line);
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fclose(f);
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return fhp;
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}
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void write_fault_pages(void *addr, unsigned long nr_pages)
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{
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unsigned long i;
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for (i = 0; i < nr_pages; i++)
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*((unsigned long *)(addr + (i * huge_page_size))) = i;
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}
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void read_fault_pages(void *addr, unsigned long nr_pages)
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{
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unsigned long dummy = 0;
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unsigned long i;
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for (i = 0; i < nr_pages; i++)
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dummy += *((unsigned long *)(addr + (i * huge_page_size)));
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}
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int main(int argc, char **argv)
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{
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unsigned long free_hugepages;
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void *addr, *addr2;
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int fd;
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int ret;
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if (argc != 2) {
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printf(USAGE, argv[0]);
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exit(1);
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}
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huge_page_size = default_huge_page_size();
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if (!huge_page_size) {
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printf("Unable to determine huge page size, exiting!\n");
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exit(1);
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}
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base_page_size = sysconf(_SC_PAGE_SIZE);
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if (!huge_page_size) {
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printf("Unable to determine base page size, exiting!\n");
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exit(1);
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}
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free_hugepages = get_free_hugepages();
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if (free_hugepages < MIN_FREE_PAGES) {
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printf("Not enough free huge pages to test, exiting!\n");
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exit(1);
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}
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fd = open(argv[1], O_CREAT | O_RDWR, 0755);
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if (fd < 0) {
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perror("Open failed");
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exit(1);
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}
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/*
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* Test validity of MADV_DONTNEED addr and length arguments. mmap
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* size is NR_HUGE_PAGES + 2. One page at the beginning and end of
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* the mapping will be unmapped so we KNOW there is nothing mapped
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* there.
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*/
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addr = mmap(NULL, (NR_HUGE_PAGES + 2) * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
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-1, 0);
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if (addr == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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if (munmap(addr, huge_page_size) ||
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munmap(addr + (NR_HUGE_PAGES + 1) * huge_page_size,
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huge_page_size)) {
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perror("munmap");
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exit(1);
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}
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addr = addr + huge_page_size;
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/* addr before mapping should fail */
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ret = madvise(addr - base_page_size, NR_HUGE_PAGES * huge_page_size,
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MADV_DONTNEED);
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if (!ret) {
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printf("Unexpected success of madvise call with invalid addr line %d\n",
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__LINE__);
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exit(1);
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}
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/* addr + length after mapping should fail */
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ret = madvise(addr, (NR_HUGE_PAGES * huge_page_size) + base_page_size,
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MADV_DONTNEED);
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if (!ret) {
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printf("Unexpected success of madvise call with invalid length line %d\n",
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__LINE__);
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exit(1);
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}
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(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
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/*
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* Test alignment of MADV_DONTNEED addr and length arguments
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*/
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addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
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-1, 0);
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if (addr == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/* addr is not huge page size aligned and should fail */
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ret = madvise(addr + base_page_size,
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NR_HUGE_PAGES * huge_page_size - base_page_size,
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MADV_DONTNEED);
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if (!ret) {
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printf("Unexpected success of madvise call with unaligned start address %d\n",
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__LINE__);
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exit(1);
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}
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/* addr + length should be aligned up to huge page size */
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if (madvise(addr,
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((NR_HUGE_PAGES - 1) * huge_page_size) + base_page_size,
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MADV_DONTNEED)) {
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perror("madvise");
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exit(1);
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}
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/* should free all pages in mapping */
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validate_free_pages(free_hugepages);
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(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
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/*
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* Test MADV_DONTNEED on anonymous private mapping
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*/
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addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
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-1, 0);
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if (addr == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
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perror("madvise");
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exit(1);
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}
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/* should free all pages in mapping */
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validate_free_pages(free_hugepages);
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(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
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/*
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* Test MADV_DONTNEED on private mapping of hugetlb file
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*/
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if (fallocate(fd, 0, 0, NR_HUGE_PAGES * huge_page_size)) {
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perror("fallocate");
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exit(1);
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}
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE, fd, 0);
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if (addr == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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/* read should not consume any pages */
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read_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/* madvise should not free any pages */
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if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
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perror("madvise");
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exit(1);
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}
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/* writes should allocate private pages */
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - (2 * NR_HUGE_PAGES));
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/* madvise should free private pages */
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if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
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perror("madvise");
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exit(1);
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}
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/* writes should allocate private pages */
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - (2 * NR_HUGE_PAGES));
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/*
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* The fallocate below certainly should free the pages associated
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* with the file. However, pages in the private mapping are also
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* freed. This is not the 'correct' behavior, but is expected
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* because this is how it has worked since the initial hugetlb
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* implementation.
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*/
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if (fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
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0, NR_HUGE_PAGES * huge_page_size)) {
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perror("fallocate");
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exit(1);
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}
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validate_free_pages(free_hugepages);
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(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
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/*
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* Test MADV_DONTNEED on shared mapping of hugetlb file
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*/
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if (fallocate(fd, 0, 0, NR_HUGE_PAGES * huge_page_size)) {
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perror("fallocate");
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exit(1);
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}
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0);
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if (addr == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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/* write should not consume any pages */
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/* madvise should not free any pages */
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if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
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perror("madvise");
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exit(1);
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}
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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/*
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* Test MADV_REMOVE on shared mapping of hugetlb file
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*
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* madvise is same as hole punch and should free all pages.
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*/
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if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_REMOVE)) {
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perror("madvise");
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exit(1);
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}
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validate_free_pages(free_hugepages);
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(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
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/*
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* Test MADV_REMOVE on shared and private mapping of hugetlb file
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*/
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if (fallocate(fd, 0, 0, NR_HUGE_PAGES * huge_page_size)) {
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perror("fallocate");
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exit(1);
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}
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0);
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if (addr == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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/* shared write should not consume any additional pages */
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write_fault_pages(addr, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
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addr2 = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE, fd, 0);
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if (addr2 == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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/* private read should not consume any pages */
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read_fault_pages(addr2, NR_HUGE_PAGES);
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validate_free_pages(free_hugepages - NR_HUGE_PAGES);
|
||
|
|
|
||
|
|
/* private write should consume additional pages */
|
||
|
|
write_fault_pages(addr2, NR_HUGE_PAGES);
|
||
|
|
validate_free_pages(free_hugepages - (2 * NR_HUGE_PAGES));
|
||
|
|
|
||
|
|
/* madvise of shared mapping should not free any pages */
|
||
|
|
if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
|
||
|
|
perror("madvise");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
validate_free_pages(free_hugepages - (2 * NR_HUGE_PAGES));
|
||
|
|
|
||
|
|
/* madvise of private mapping should free private pages */
|
||
|
|
if (madvise(addr2, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
|
||
|
|
perror("madvise");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
validate_free_pages(free_hugepages - NR_HUGE_PAGES);
|
||
|
|
|
||
|
|
/* private write should consume additional pages again */
|
||
|
|
write_fault_pages(addr2, NR_HUGE_PAGES);
|
||
|
|
validate_free_pages(free_hugepages - (2 * NR_HUGE_PAGES));
|
||
|
|
|
||
|
|
/*
|
||
|
|
* madvise should free both file and private pages although this is
|
||
|
|
* not correct. private pages should not be freed, but this is
|
||
|
|
* expected. See comment associated with FALLOC_FL_PUNCH_HOLE call.
|
||
|
|
*/
|
||
|
|
if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_REMOVE)) {
|
||
|
|
perror("madvise");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
validate_free_pages(free_hugepages);
|
||
|
|
|
||
|
|
(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
|
||
|
|
(void)munmap(addr2, NR_HUGE_PAGES * huge_page_size);
|
||
|
|
|
||
|
|
close(fd);
|
||
|
|
unlink(argv[1]);
|
||
|
|
return 0;
|
||
|
|
}
|