tests/migration/stress.c

   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 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 PAGE_SIZE 4096
  31
  32 static int gettid(void)
  33 {
  34     return syscall(SYS_gettid);
  35 }
  36
  37 static __attribute__((noreturn)) void exit_failure(void)
  38 {
  39     if (getpid() == 1) {
  40         sync();
  41         reboot(RB_POWER_OFF);
  42         fprintf(stderr, "%s (%05d): ERROR: cannot reboot: %s\n",
  43                 argv0, gettid(), strerror(errno));
  44         abort();
  45     } else {
  46         exit(1);
  47     }
  48 }
  49
  50 static __attribute__((noreturn)) void exit_success(void)
  51 {
  52     if (getpid() == 1) {
  53         sync();
  54         reboot(RB_POWER_OFF);
  55         fprintf(stderr, "%s (%05d): ERROR: cannot reboot: %s\n",
  56                 argv0, gettid(), strerror(errno));
  57         abort();
  58     } else {
  59         exit(0);
  60     }
  61 }
  62
  63 static int get_command_arg_str(const char *name,
  64                                char **val)
  65 {
  66     static char line[1024];
  67     FILE *fp = fopen("/proc/cmdline", "r");
  68     char *start, *end;
  69
  70     if (fp == NULL) {
  71         fprintf(stderr, "%s (%05d): ERROR: cannot open /proc/cmdline: %s\n",
  72                 argv0, gettid(), strerror(errno));
  73         return -1;
  74     }
  75
  76     if (!fgets(line, sizeof line, fp)) {
  77         fprintf(stderr, "%s (%05d): ERROR: cannot read /proc/cmdline: %s\n",
  78                 argv0, gettid(), strerror(errno));
  79         fclose(fp);
  80         return -1;
  81     }
  82     fclose(fp);
  83
  84     start = strstr(line, name);
  85     if (!start)
  86         return 0;
  87
  88     start += strlen(name);
  89
  90     if (*start != '=') {
  91         fprintf(stderr, "%s (%05d): ERROR: no value provided for '%s' in /proc/cmdline\n",
  92                 argv0, gettid(), name);
  93     }
  94     start++;
  95
  96     end = strstr(start, " ");
  97     if (!end)
  98         end = strstr(start, "\n");
  99
 100     if (end == start) {
 101         fprintf(stderr, "%s (%05d): ERROR: no value provided for '%s' in /proc/cmdline\n",
 102                 argv0, gettid(), name);
 103         return -1;
 104     }
 105
 106     if (end)
 107         *val = g_strndup(start, end - start);
 108     else
 109         *val = g_strdup(start);
 110     return 1;
 111 }
 112
 113
 114 static int get_command_arg_ull(const char *name,
 115                                unsigned long long *val)
 116 {
 117     char *valstr;
 118     char *end;
 119
 120     int ret = get_command_arg_str(name, &valstr);
 121     if (ret <= 0)
 122         return ret;
 123
 124     errno = 0;
 125     *val = strtoll(valstr, &end, 10);
 126     if (errno || *end) {
 127         fprintf(stderr, "%s (%05d): ERROR: cannot parse %s value %s\n",
 128                 argv0, gettid(), name, valstr);
 129         g_free(valstr);
 130         return -1;
 131     }
 132     g_free(valstr);
 133     return 0;
 134 }
 135
 136
 137 static int random_bytes(char *buf, size_t len)
 138 {
 139     int fd;
 140
 141     fd = open("/dev/urandom", O_RDONLY);
 142     if (fd < 0) {
 143         fprintf(stderr, "%s (%05d): ERROR: cannot open /dev/urandom: %s\n",
 144                 argv0, gettid(), strerror(errno));
 145         return -1;
 146     }
 147
 148     if (read(fd, buf, len) != len) {
 149         fprintf(stderr, "%s (%05d): ERROR: cannot read /dev/urandom: %s\n",
 150                 argv0, gettid(), strerror(errno));
 151         close(fd);
 152         return -1;
 153     }
 154
 155     close(fd);
 156
 157     return 0;
 158 }
 159
 160
 161 static unsigned long long now(void)
 162 {
 163     struct timeval tv;
 164
 165     gettimeofday(&tv, NULL);
 166
 167     return (tv.tv_sec * 1000ull) + (tv.tv_usec / 1000ull);
 168 }
 169
 170 static void stressone(unsigned long long ramsizeMB)
 171 {
 172     size_t pagesPerMB = 1024 * 1024 / PAGE_SIZE;
 173     g_autofree char *ram = g_malloc(ramsizeMB * 1024 * 1024);
 174     char *ramptr;
 175     size_t i, j, k;
 176     g_autofree char *data = g_malloc(PAGE_SIZE);
 177     char *dataptr;
 178     size_t nMB = 0;
 179     unsigned long long before, after;
 180
 181     /* We don't care about initial state, but we do want
 182      * to fault it all into RAM, otherwise the first iter
 183      * of the loop below will be quite slow. We can't use
 184      * 0x0 as the byte as gcc optimizes that away into a
 185      * calloc instead :-) */
 186     memset(ram, 0xfe, ramsizeMB * 1024 * 1024);
 187
 188     if (random_bytes(data, PAGE_SIZE) < 0) {
 189         return;
 190     }
 191
 192     before = now();
 193
 194     while (1) {
 195
 196         ramptr = ram;
 197         for (i = 0; i < ramsizeMB; i++, nMB++) {
 198             for (j = 0; j < pagesPerMB; j++) {
 199                 dataptr = data;
 200                 for (k = 0; k < PAGE_SIZE; k += sizeof(long long)) {
 201                     ramptr += sizeof(long long);
 202                     dataptr += sizeof(long long);
 203                     *(unsigned long long *)ramptr ^= *(unsigned long long *)dataptr;
 204                 }
 205             }
 206
 207             if (nMB == 1024) {
 208                 after = now();
 209                 fprintf(stderr, "%s (%05d): INFO: %06llums copied 1 GB in %05llums\n",
 210                         argv0, gettid(), after, after - before);
 211                 before = now();
 212                 nMB = 0;
 213             }
 214         }
 215     }
 216 }
 217
 218
 219 static void *stressthread(void *arg)
 220 {
 221     unsigned long long ramsizeMB = *(unsigned long long *)arg;
 222
 223     stressone(ramsizeMB);
 224
 225     return NULL;
 226 }
 227
 228 static void stress(unsigned long long ramsizeGB, int ncpus)
 229 {
 230     size_t i;
 231     unsigned long long ramsizeMB = ramsizeGB * 1024 / ncpus;
 232     ncpus--;
 233
 234     for (i = 0; i < ncpus; i++) {
 235         pthread_t thr;
 236         pthread_create(&thr, NULL,
 237                        stressthread,   &ramsizeMB);
 238     }
 239
 240     stressone(ramsizeMB);
 241 }
 242
 243
 244 static int mount_misc(const char *fstype, const char *dir)
 245 {
 246     if (mkdir(dir, 0755) < 0 && errno != EEXIST) {
 247         fprintf(stderr, "%s (%05d): ERROR: cannot create %s: %s\n",
 248                 argv0, gettid(), dir, strerror(errno));
 249         return -1;
 250     }
 251
 252     if (mount("none", dir, fstype, 0, NULL) < 0) {
 253         fprintf(stderr, "%s (%05d): ERROR: cannot mount %s: %s\n",
 254                 argv0, gettid(), dir, strerror(errno));
 255         return -1;
 256     }
 257
 258     return 0;
 259 }
 260
 261 static int mount_all(void)
 262 {
 263     if (mount_misc("proc", "/proc") < 0 ||
 264         mount_misc("sysfs", "/sys") < 0 ||
 265         mount_misc("tmpfs", "/dev") < 0)
 266         return -1;
 267
 268     mknod("/dev/urandom", 0777 | S_IFCHR, makedev(1, 9));
 269     mknod("/dev/random", 0777 | S_IFCHR, makedev(1, 8));
 270
 271     return 0;
 272 }
 273
 274 int main(int argc, char **argv)
 275 {
 276     unsigned long long ramsizeGB = 1;
 277     char *end;
 278     int ch;
 279     int opt_ind = 0;
 280     const char *sopt = "hr:c:";
 281     struct option lopt[] = {
 282         { "help", no_argument, NULL, 'h' },
 283         { "ramsize", required_argument, NULL, 'r' },
 284         { "cpus", required_argument, NULL, 'c' },
 285         { NULL, 0, NULL, 0 }
 286     };
 287     int ret;
 288     int ncpus = 0;
 289
 290     argv0 = argv[0];
 291
 292     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
 293         switch (ch) {
 294         case 'r':
 295             errno = 0;
 296             ramsizeGB = strtoll(optarg, &end, 10);
 297             if (errno != 0 || *end) {
 298                 fprintf(stderr, "%s (%05d): ERROR: Cannot parse RAM size %s\n",
 299                         argv0, gettid(), optarg);
 300                 exit_failure();
 301             }
 302             break;
 303
 304         case 'c':
 305             errno = 0;
 306             ncpus = strtoll(optarg, &end, 10);
 307             if (errno != 0 || *end) {
 308                 fprintf(stderr, "%s (%05d): ERROR: Cannot parse CPU count %s\n",
 309                         argv0, gettid(), optarg);
 310                 exit_failure();
 311             }
 312             break;
 313
 314         case '?':
 315         case 'h':
 316             fprintf(stderr, "%s: [--help][--ramsize GB][--cpus N]\n", argv0);
 317             exit_failure();
 318         }
 319     }
 320
 321     if (getpid() == 1) {
 322         if (mount_all() < 0)
 323             exit_failure();
 324
 325         ret = get_command_arg_ull("ramsize", &ramsizeGB);
 326         if (ret < 0)
 327             exit_failure();
 328     }
 329
 330     if (ncpus == 0)
 331         ncpus = sysconf(_SC_NPROCESSORS_ONLN);
 332
 333     fprintf(stdout, "%s (%05d): INFO: RAM %llu GiB across %d CPUs\n",
 334             argv0, gettid(), ramsizeGB, ncpus);
 335
 336     stress(ramsizeGB, ncpus);
 337
 338     exit_failure();
 339 }