selftests/mm/hugetlb-madvise.c

40 void write_fault_pages(void *addr, unsigned long nr_pages)
45 		*((unsigned long *)(addr + (i * huge_page_size))) = i;
48 void read_fault_pages(void *addr, unsigned long nr_pages)
54 		dummy += *((unsigned long *)(addr + (i * huge_page_size)));
64 	void *addr, *addr2;
92 	 * Test validity of MADV_DONTNEED addr and length arguments.  mmap
97 	addr = mmap(NULL, (NR_HUGE_PAGES + 2) * huge_page_size,
101 	if (addr == MAP_FAILED) {
105 	if (munmap(addr, huge_page_size) ||
106 			munmap(addr + (NR_HUGE_PAGES + 1) * huge_page_size,
111 	addr = addr + huge_page_size;
113 	write_fault_pages(addr, NR_HUGE_PAGES);
116 	/* addr before mapping should fail */
117 	ret = madvise(addr - base_page_size, NR_HUGE_PAGES * huge_page_size,
120 		printf("Unexpected success of madvise call with invalid addr line %d\n",
125 	/* addr + length after mapping should fail */
126 	ret = madvise(addr, (NR_HUGE_PAGES * huge_page_size) + base_page_size,
134 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
137 	 * Test alignment of MADV_DONTNEED addr and length arguments
139 	addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
143 	if (addr == MAP_FAILED) {
147 	write_fault_pages(addr, NR_HUGE_PAGES);
150 	/* addr is not huge page size aligned and should fail */
151 	ret = madvise(addr + base_page_size,
160 	/* addr + length should be aligned down to huge page size */
161 	if (madvise(addr,
171 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
177 	addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
181 	if (addr == MAP_FAILED) {
185 	write_fault_pages(addr, NR_HUGE_PAGES);
188 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
196 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
207 	addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
210 	if (addr == MAP_FAILED) {
216 	read_fault_pages(addr, NR_HUGE_PAGES);
220 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
227 	write_fault_pages(addr, NR_HUGE_PAGES);
231 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
238 	write_fault_pages(addr, NR_HUGE_PAGES);
255 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
266 	addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
269 	if (addr == MAP_FAILED) {
275 	write_fault_pages(addr, NR_HUGE_PAGES);
279 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
290 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_REMOVE)) {
295 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);
306 	addr = mmap(NULL, NR_HUGE_PAGES * huge_page_size,
309 	if (addr == MAP_FAILED) {
315 	write_fault_pages(addr, NR_HUGE_PAGES);
335 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_DONTNEED)) {
357 	if (madvise(addr, NR_HUGE_PAGES * huge_page_size, MADV_REMOVE)) {
363 	(void)munmap(addr, NR_HUGE_PAGES * huge_page_size);