1 // SPDX-License-Identifier: GPL-2.0
25 	void *map;  member
32 	char *cmd = "cat /proc/meminfo | grep -i memfree | grep -o '[0-9]*'";  in read_memory_info()
37 		return -1;  in read_memory_info()
43 	cmd = "cat /proc/meminfo | grep -i hugepagesize | grep -o '[0-9]*'";  in read_memory_info()
48 		return -1;  in read_memory_info()
62 	fd = open("/proc/sys/vm/compact_unevictable_allowed",  in prereq()
65 		ksft_print_msg("Failed to open /proc/sys/vm/compact_unevictable_allowed: %s\n",  in prereq()
67 		return -1;  in prereq()
71 		ksft_print_msg("Failed to read from /proc/sys/vm/compact_unevictable_allowed: %s\n",  in prereq()
74 		return -1;  in prereq()
82 	return -1;  in prereq()
88 	int fd, ret = -1;  in check_compaction()
97 	fd = open("/proc/sys/vm/nr_hugepages", O_RDWR | O_NONBLOCK);  in check_compaction()
99 		ksft_print_msg("Failed to open /proc/sys/vm/nr_hugepages: %s\n",  in check_compaction()
101 		ret = -1;  in check_compaction()
106 		ksft_print_msg("Failed to read from /proc/sys/vm/nr_hugepages: %s\n",  in check_compaction()
115 		ksft_print_msg("Failed to write 0 to /proc/sys/vm/nr_hugepages: %s\n",  in check_compaction()
125 		ksft_print_msg("Failed to write 100000 to /proc/sys/vm/nr_hugepages: %s\n",  in check_compaction()
133 		ksft_print_msg("Failed to re-read from /proc/sys/vm/nr_hugepages: %s\n",  in check_compaction()
151 		ksft_print_msg("Failed to write value to /proc/sys/vm/nr_hugepages: %s\n",  in check_compaction()
180 	void *map = NULL;  in main()  local
205 		map = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE,  in main()
206 			   MAP_ANONYMOUS | MAP_PRIVATE | MAP_LOCKED, -1, 0);  in main()
207 		if (map == MAP_FAILED)  in main()
212 			munmap(map, MAP_SIZE);  in main()
215 		entry->map = map;  in main()
216 		entry->next = list;  in main()
219 		/* Write something (in this case the address of the map) to  in main()
223 			*(unsigned long *)(map + i) = (unsigned long)map + i;  in main()
225 		mem_fragmentable_MB -= MAP_SIZE_MB;  in main()
228 	for (entry = list; entry != NULL; entry = entry->next) {  in main()
229 		munmap(entry->map, MAP_SIZE);  in main()
230 		if (!entry->next)  in main()
232 		entry = entry->next;  in main()