56 	int fd;  in prereq()  local
58 	fd = open("/proc/sys/vm/compact_unevictable_allowed",  in prereq()
60 	if (fd < 0) {  in prereq()
66 	if (read(fd, &allowed, sizeof(char)) != sizeof(char)) {  in prereq()
69 		close(fd);  in prereq()
73 	close(fd);  in prereq()
82 	int fd;  in check_compaction()  local
91 	fd = open("/proc/sys/vm/nr_hugepages", O_RDWR | O_NONBLOCK);  in check_compaction()
92 	if (fd < 0) {  in check_compaction()
97 	if (read(fd, initial_nr_hugepages, sizeof(initial_nr_hugepages)) <= 0) {  in check_compaction()
103 	if (write(fd, "0", sizeof(char)) != sizeof(char)) {  in check_compaction()
108 	lseek(fd, 0, SEEK_SET);  in check_compaction()
112 	if (write(fd, "100000", (6*sizeof(char))) != (6*sizeof(char))) {  in check_compaction()
117 	lseek(fd, 0, SEEK_SET);  in check_compaction()
119 	if (read(fd, nr_hugepages, sizeof(nr_hugepages)) <= 0) {  in check_compaction()
139 	if (write(fd, initial_nr_hugepages, sizeof(initial_nr_hugepages))  in check_compaction()
145 	close(fd);  in check_compaction()
149 	close(fd);  in check_compaction()