diff options
Diffstat (limited to 'tests/migration-stress/stress.c')
| -rw-r--r-- | tests/migration-stress/stress.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/tests/migration-stress/stress.c b/tests/migration-stress/stress.c new file mode 100644 index 0000000000..88acf8dc25 --- /dev/null +++ b/tests/migration-stress/stress.c @@ -0,0 +1,328 @@ +/* + * Migration stress workload + * + * Copyright (c) 2016 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include <getopt.h> +#include <sys/reboot.h> +#include <sys/syscall.h> +#include <linux/random.h> +#include <pthread.h> +#include <sys/mount.h> + +const char *argv0; + +#define RAM_PAGE_SIZE 4096 + +#ifndef CONFIG_GETTID +static int gettid(void) +{ + return syscall(SYS_gettid); +} +#endif + +static __attribute__((noreturn)) void exit_failure(void) +{ + if (getpid() == 1) { + sync(); + reboot(RB_POWER_OFF); + fprintf(stderr, "%s (%05d): ERROR: cannot reboot: %s\n", + argv0, gettid(), strerror(errno)); + abort(); + } else { + exit(1); + } +} + +static int get_command_arg_str(const char *name, + char **val) +{ + static char line[1024]; + FILE *fp = fopen("/proc/cmdline", "r"); + char *start, *end; + + if (fp == NULL) { + fprintf(stderr, "%s (%05d): ERROR: cannot open /proc/cmdline: %s\n", + argv0, gettid(), strerror(errno)); + return -1; + } + + if (!fgets(line, sizeof line, fp)) { + fprintf(stderr, "%s (%05d): ERROR: cannot read /proc/cmdline: %s\n", + argv0, gettid(), strerror(errno)); + fclose(fp); + return -1; + } + fclose(fp); + + start = strstr(line, name); + if (!start) + return 0; + + start += strlen(name); + + if (*start != '=') { + fprintf(stderr, "%s (%05d): ERROR: no value provided for '%s' in /proc/cmdline\n", + argv0, gettid(), name); + } + start++; + + end = strstr(start, " "); + if (!end) + end = strstr(start, "\n"); + + if (end == start) { + fprintf(stderr, "%s (%05d): ERROR: no value provided for '%s' in /proc/cmdline\n", + argv0, gettid(), name); + return -1; + } + + if (end) + *val = g_strndup(start, end - start); + else + *val = g_strdup(start); + return 1; +} + + +static int get_command_arg_ull(const char *name, + unsigned long long *val) +{ + char *valstr; + char *end; + + int ret = get_command_arg_str(name, &valstr); + if (ret <= 0) + return ret; + + errno = 0; + *val = strtoll(valstr, &end, 10); + if (errno || *end) { + fprintf(stderr, "%s (%05d): ERROR: cannot parse %s value %s\n", + argv0, gettid(), name, valstr); + g_free(valstr); + return -1; + } + g_free(valstr); + return 0; +} + + +static int random_bytes(char *buf, size_t len) +{ + int fd; + + fd = open("/dev/urandom", O_RDONLY); + if (fd < 0) { + fprintf(stderr, "%s (%05d): ERROR: cannot open /dev/urandom: %s\n", + argv0, gettid(), strerror(errno)); + return -1; + } + + if (read(fd, buf, len) != len) { + fprintf(stderr, "%s (%05d): ERROR: cannot read /dev/urandom: %s\n", + argv0, gettid(), strerror(errno)); + close(fd); + return -1; + } + + close(fd); + + return 0; +} + + +static unsigned long long now(void) +{ + struct timeval tv; + + gettimeofday(&tv, NULL); + + return (tv.tv_sec * 1000ull) + (tv.tv_usec / 1000ull); +} + +static void stressone(unsigned long long ramsizeMB) +{ + size_t pagesPerMB = 1024 * 1024 / RAM_PAGE_SIZE; + g_autofree char *ram = g_malloc(ramsizeMB * 1024 * 1024); + char *ramptr; + size_t i, j, k; + g_autofree char *data = g_malloc(RAM_PAGE_SIZE); + char *dataptr; + size_t nMB = 0; + unsigned long long before, after; + + /* We don't care about initial state, but we do want + * to fault it all into RAM, otherwise the first iter + * of the loop below will be quite slow. We can't use + * 0x0 as the byte as gcc optimizes that away into a + * calloc instead :-) */ + memset(ram, 0xfe, ramsizeMB * 1024 * 1024); + + if (random_bytes(data, RAM_PAGE_SIZE) < 0) { + return; + } + + before = now(); + + while (1) { + + ramptr = ram; + for (i = 0; i < ramsizeMB; i++, nMB++) { + for (j = 0; j < pagesPerMB; j++) { + dataptr = data; + for (k = 0; k < RAM_PAGE_SIZE; k += sizeof(long long)) { + ramptr += sizeof(long long); + dataptr += sizeof(long long); + *(unsigned long long *)ramptr ^= *(unsigned long long *)dataptr; + } + } + + if (nMB == 1024) { + after = now(); + fprintf(stderr, "%s (%05d): INFO: %06llums copied 1 GB in %05llums\n", + argv0, gettid(), after, after - before); + before = now(); + nMB = 0; + } + } + } +} + + +static void *stressthread(void *arg) +{ + unsigned long long ramsizeMB = *(unsigned long long *)arg; + + stressone(ramsizeMB); + + return NULL; +} + +static void stress(unsigned long long ramsizeGB, int ncpus) +{ + size_t i; + unsigned long long ramsizeMB = ramsizeGB * 1024 / ncpus; + ncpus--; + + for (i = 0; i < ncpus; i++) { + pthread_t thr; + pthread_create(&thr, NULL, + stressthread, &ramsizeMB); + } + + stressone(ramsizeMB); +} + + +static int mount_misc(const char *fstype, const char *dir) +{ + if (g_mkdir_with_parents(dir, 0755) < 0 && errno != EEXIST) { + fprintf(stderr, "%s (%05d): ERROR: cannot create %s: %s\n", + argv0, gettid(), dir, strerror(errno)); + return -1; + } + + if (mount("none", dir, fstype, 0, NULL) < 0) { + fprintf(stderr, "%s (%05d): ERROR: cannot mount %s: %s\n", + argv0, gettid(), dir, strerror(errno)); + return -1; + } + + return 0; +} + +static int mount_all(void) +{ + if (mount_misc("proc", "/proc") < 0 || + mount_misc("sysfs", "/sys") < 0 || + mount_misc("tmpfs", "/dev") < 0) + return -1; + + mknod("/dev/urandom", 0777 | S_IFCHR, makedev(1, 9)); + mknod("/dev/random", 0777 | S_IFCHR, makedev(1, 8)); + + return 0; +} + +int main(int argc, char **argv) +{ + unsigned long long ramsizeGB = 1; + char *end; + int ch; + int opt_ind = 0; + const char *sopt = "hr:c:"; + struct option lopt[] = { + { "help", no_argument, NULL, 'h' }, + { "ramsize", required_argument, NULL, 'r' }, + { "cpus", required_argument, NULL, 'c' }, + { NULL, 0, NULL, 0 } + }; + int ret; + int ncpus = 0; + + argv0 = argv[0]; + + while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { + switch (ch) { + case 'r': + errno = 0; + ramsizeGB = strtoll(optarg, &end, 10); + if (errno != 0 || *end) { + fprintf(stderr, "%s (%05d): ERROR: Cannot parse RAM size %s\n", + argv0, gettid(), optarg); + exit_failure(); + } + break; + + case 'c': + errno = 0; + ncpus = strtoll(optarg, &end, 10); + if (errno != 0 || *end) { + fprintf(stderr, "%s (%05d): ERROR: Cannot parse CPU count %s\n", + argv0, gettid(), optarg); + exit_failure(); + } + break; + + case '?': + case 'h': + fprintf(stderr, "%s: [--help][--ramsize GB][--cpus N]\n", argv0); + exit_failure(); + } + } + + if (getpid() == 1) { + if (mount_all() < 0) + exit_failure(); + + ret = get_command_arg_ull("ramsize", &ramsizeGB); + if (ret < 0) + exit_failure(); + } + + if (ncpus == 0) + ncpus = sysconf(_SC_NPROCESSORS_ONLN); + + fprintf(stdout, "%s (%05d): INFO: RAM %llu GiB across %d CPUs\n", + argv0, gettid(), ramsizeGB, ncpus); + + stress(ramsizeGB, ncpus); + + exit_failure(); +} |