| 1 | /* |
| 2 | * Migration stress workload |
| 3 | * |
| 4 | * Copyright (c) 2016 Red Hat, Inc. |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include <getopt.h> |
| 22 | #include <sys/reboot.h> |
| 23 | #include <sys/syscall.h> |
| 24 | #include <linux/random.h> |
| 25 | #include <pthread.h> |
| 26 | #include <sys/mount.h> |
| 27 | |
| 28 | const char *argv0; |
| 29 | |
| 30 | #define RAM_PAGE_SIZE 4096 |
| 31 | |
| 32 | #ifndef CONFIG_GETTID |
| 33 | static int gettid(void) |
| 34 | { |
| 35 | return syscall(SYS_gettid); |
| 36 | } |
| 37 | #endif |
| 38 | |
| 39 | static __attribute__((noreturn)) void exit_failure(void) |
| 40 | { |
| 41 | if (getpid() == 1) { |
| 42 | sync(); |
| 43 | reboot(RB_POWER_OFF); |
| 44 | fprintf(stderr, "%s (%05d): ERROR: cannot reboot: %s\n", |
| 45 | argv0, gettid(), strerror(errno)); |
| 46 | abort(); |
| 47 | } else { |
| 48 | exit(1); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | static int get_command_arg_str(const char *name, |
| 53 | char **val) |
| 54 | { |
| 55 | static char line[1024]; |
| 56 | FILE *fp = fopen("/proc/cmdline", "r"); |
| 57 | char *start, *end; |
| 58 | |
| 59 | if (fp == NULL) { |
| 60 | fprintf(stderr, "%s (%05d): ERROR: cannot open /proc/cmdline: %s\n", |
| 61 | argv0, gettid(), strerror(errno)); |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | if (!fgets(line, sizeof line, fp)) { |
| 66 | fprintf(stderr, "%s (%05d): ERROR: cannot read /proc/cmdline: %s\n", |
| 67 | argv0, gettid(), strerror(errno)); |
| 68 | fclose(fp); |
| 69 | return -1; |
| 70 | } |
| 71 | fclose(fp); |
| 72 | |
| 73 | start = strstr(line, name); |
| 74 | if (!start) |
| 75 | return 0; |
| 76 | |
| 77 | start += strlen(name); |
| 78 | |
| 79 | if (*start != '=') { |
| 80 | fprintf(stderr, "%s (%05d): ERROR: no value provided for '%s' in /proc/cmdline\n", |
| 81 | argv0, gettid(), name); |
| 82 | } |
| 83 | start++; |
| 84 | |
| 85 | end = strstr(start, " "); |
| 86 | if (!end) |
| 87 | end = strstr(start, "\n"); |
| 88 | |
| 89 | if (end == start) { |
| 90 | fprintf(stderr, "%s (%05d): ERROR: no value provided for '%s' in /proc/cmdline\n", |
| 91 | argv0, gettid(), name); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | if (end) |
| 96 | *val = g_strndup(start, end - start); |
| 97 | else |
| 98 | *val = g_strdup(start); |
| 99 | return 1; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | static int get_command_arg_ull(const char *name, |
| 104 | unsigned long long *val) |
| 105 | { |
| 106 | char *valstr; |
| 107 | char *end; |
| 108 | |
| 109 | int ret = get_command_arg_str(name, &valstr); |
| 110 | if (ret <= 0) |
| 111 | return ret; |
| 112 | |
| 113 | errno = 0; |
| 114 | *val = strtoll(valstr, &end, 10); |
| 115 | if (errno || *end) { |
| 116 | fprintf(stderr, "%s (%05d): ERROR: cannot parse %s value %s\n", |
| 117 | argv0, gettid(), name, valstr); |
| 118 | g_free(valstr); |
| 119 | return -1; |
| 120 | } |
| 121 | g_free(valstr); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | static int random_bytes(char *buf, size_t len) |
| 127 | { |
| 128 | int fd; |
| 129 | |
| 130 | fd = open("/dev/urandom", O_RDONLY); |
| 131 | if (fd < 0) { |
| 132 | fprintf(stderr, "%s (%05d): ERROR: cannot open /dev/urandom: %s\n", |
| 133 | argv0, gettid(), strerror(errno)); |
| 134 | return -1; |
| 135 | } |
| 136 | |
| 137 | if (read(fd, buf, len) != len) { |
| 138 | fprintf(stderr, "%s (%05d): ERROR: cannot read /dev/urandom: %s\n", |
| 139 | argv0, gettid(), strerror(errno)); |
| 140 | close(fd); |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | close(fd); |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | |
| 150 | static unsigned long long now(void) |
| 151 | { |
| 152 | struct timeval tv; |
| 153 | |
| 154 | gettimeofday(&tv, NULL); |
| 155 | |
| 156 | return (tv.tv_sec * 1000ull) + (tv.tv_usec / 1000ull); |
| 157 | } |
| 158 | |
| 159 | static void stressone(unsigned long long ramsizeMB) |
| 160 | { |
| 161 | size_t pagesPerMB = 1024 * 1024 / RAM_PAGE_SIZE; |
| 162 | g_autofree char *ram = g_malloc(ramsizeMB * 1024 * 1024); |
| 163 | char *ramptr; |
| 164 | size_t i, j, k; |
| 165 | g_autofree char *data = g_malloc(RAM_PAGE_SIZE); |
| 166 | char *dataptr; |
| 167 | size_t nMB = 0; |
| 168 | unsigned long long before, after; |
| 169 | |
| 170 | /* We don't care about initial state, but we do want |
| 171 | * to fault it all into RAM, otherwise the first iter |
| 172 | * of the loop below will be quite slow. We can't use |
| 173 | * 0x0 as the byte as gcc optimizes that away into a |
| 174 | * calloc instead :-) */ |
| 175 | memset(ram, 0xfe, ramsizeMB * 1024 * 1024); |
| 176 | |
| 177 | if (random_bytes(data, RAM_PAGE_SIZE) < 0) { |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | before = now(); |
| 182 | |
| 183 | while (1) { |
| 184 | |
| 185 | ramptr = ram; |
| 186 | for (i = 0; i < ramsizeMB; i++, nMB++) { |
| 187 | for (j = 0; j < pagesPerMB; j++) { |
| 188 | dataptr = data; |
| 189 | for (k = 0; k < RAM_PAGE_SIZE; k += sizeof(long long)) { |
| 190 | ramptr += sizeof(long long); |
| 191 | dataptr += sizeof(long long); |
| 192 | *(unsigned long long *)ramptr ^= *(unsigned long long *)dataptr; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | if (nMB == 1024) { |
| 197 | after = now(); |
| 198 | fprintf(stderr, "%s (%05d): INFO: %06llums copied 1 GB in %05llums\n", |
| 199 | argv0, gettid(), after, after - before); |
| 200 | before = now(); |
| 201 | nMB = 0; |
| 202 | } |
| 203 | } |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | |
| 208 | static void *stressthread(void *arg) |
| 209 | { |
| 210 | unsigned long long ramsizeMB = *(unsigned long long *)arg; |
| 211 | |
| 212 | stressone(ramsizeMB); |
| 213 | |
| 214 | return NULL; |
| 215 | } |
| 216 | |
| 217 | static void stress(unsigned long long ramsizeGB, int ncpus) |
| 218 | { |
| 219 | size_t i; |
| 220 | unsigned long long ramsizeMB = ramsizeGB * 1024 / ncpus; |
| 221 | ncpus--; |
| 222 | |
| 223 | for (i = 0; i < ncpus; i++) { |
| 224 | pthread_t thr; |
| 225 | pthread_create(&thr, NULL, |
| 226 | stressthread, &ramsizeMB); |
| 227 | } |
| 228 | |
| 229 | stressone(ramsizeMB); |
| 230 | } |
| 231 | |
| 232 | |
| 233 | static int mount_misc(const char *fstype, const char *dir) |
| 234 | { |
| 235 | if (g_mkdir_with_parents(dir, 0755) < 0 && errno != EEXIST) { |
| 236 | fprintf(stderr, "%s (%05d): ERROR: cannot create %s: %s\n", |
| 237 | argv0, gettid(), dir, strerror(errno)); |
| 238 | return -1; |
| 239 | } |
| 240 | |
| 241 | if (mount("none", dir, fstype, 0, NULL) < 0) { |
| 242 | fprintf(stderr, "%s (%05d): ERROR: cannot mount %s: %s\n", |
| 243 | argv0, gettid(), dir, strerror(errno)); |
| 244 | return -1; |
| 245 | } |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | static int mount_all(void) |
| 251 | { |
| 252 | if (mount_misc("proc", "/proc") < 0 || |
| 253 | mount_misc("sysfs", "/sys") < 0 || |
| 254 | mount_misc("tmpfs", "/dev") < 0) |
| 255 | return -1; |
| 256 | |
| 257 | mknod("/dev/urandom", 0777 | S_IFCHR, makedev(1, 9)); |
| 258 | mknod("/dev/random", 0777 | S_IFCHR, makedev(1, 8)); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | int main(int argc, char **argv) |
| 264 | { |
| 265 | unsigned long long ramsizeGB = 1; |
| 266 | char *end; |
| 267 | int ch; |
| 268 | int opt_ind = 0; |
| 269 | const char *sopt = "hr:c:"; |
| 270 | struct option lopt[] = { |
| 271 | { "help", no_argument, NULL, 'h' }, |
| 272 | { "ramsize", required_argument, NULL, 'r' }, |
| 273 | { "cpus", required_argument, NULL, 'c' }, |
| 274 | { NULL, 0, NULL, 0 } |
| 275 | }; |
| 276 | int ret; |
| 277 | int ncpus = 0; |
| 278 | |
| 279 | argv0 = argv[0]; |
| 280 | |
| 281 | while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { |
| 282 | switch (ch) { |
| 283 | case 'r': |
| 284 | errno = 0; |
| 285 | ramsizeGB = strtoll(optarg, &end, 10); |
| 286 | if (errno != 0 || *end) { |
| 287 | fprintf(stderr, "%s (%05d): ERROR: Cannot parse RAM size %s\n", |
| 288 | argv0, gettid(), optarg); |
| 289 | exit_failure(); |
| 290 | } |
| 291 | break; |
| 292 | |
| 293 | case 'c': |
| 294 | errno = 0; |
| 295 | ncpus = strtoll(optarg, &end, 10); |
| 296 | if (errno != 0 || *end) { |
| 297 | fprintf(stderr, "%s (%05d): ERROR: Cannot parse CPU count %s\n", |
| 298 | argv0, gettid(), optarg); |
| 299 | exit_failure(); |
| 300 | } |
| 301 | break; |
| 302 | |
| 303 | case '?': |
| 304 | case 'h': |
| 305 | fprintf(stderr, "%s: [--help][--ramsize GB][--cpus N]\n", argv0); |
| 306 | exit_failure(); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | if (getpid() == 1) { |
| 311 | if (mount_all() < 0) |
| 312 | exit_failure(); |
| 313 | |
| 314 | ret = get_command_arg_ull("ramsize", &ramsizeGB); |
| 315 | if (ret < 0) |
| 316 | exit_failure(); |
| 317 | } |
| 318 | |
| 319 | if (ncpus == 0) |
| 320 | ncpus = sysconf(_SC_NPROCESSORS_ONLN); |
| 321 | |
| 322 | fprintf(stdout, "%s (%05d): INFO: RAM %llu GiB across %d CPUs\n", |
| 323 | argv0, gettid(), ramsizeGB, ncpus); |
| 324 | |
| 325 | stress(ramsizeGB, ncpus); |
| 326 | |
| 327 | exit_failure(); |
| 328 | } |