/*
* 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 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 PAGE_SIZE 4096
static int gettid(void)
{
return syscall(SYS_gettid);
}
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 __attribute__((noreturn)) void exit_success(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(0);
}
}
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 = strndup(start, end - start);
else
*val = 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);
free(valstr);
return -1;
}
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 int stressone(unsigned long long ramsizeMB)
{
size_t pagesPerMB = 1024 * 1024 / PAGE_SIZE;
char *ram = malloc(ramsizeMB * 1024 * 1024);
char *ramptr;
size_t i, j, k;
char *data = malloc(PAGE_SIZE);
char *dataptr;
size_t nMB = 0;
unsigned long long before, after;
if (!ram) {
fprintf(stderr, "%s (%05d): ERROR: cannot allocate %llu MB of RAM: %s\n",
argv0, gettid(), ramsizeMB, strerror(errno));
return -1;
}
if (!data) {
fprintf(stderr, "%s (%d): ERROR: cannot allocate %d bytes of RAM: %s\n",
argv0, gettid(), PAGE_SIZE, strerror(errno));
free(ram);
return -1;
}
/* 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 cna'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, PAGE_SIZE) < 0) {
free(ram);
free(data);
return -1;
}
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 < 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;
}
}
}
free(data);
free(ram);
}
static void *stressthread(void *arg)
{
unsigned long long ramsizeMB = *(unsigned long long *)arg;
stressone(ramsizeMB);
return NULL;
}
static int 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);
return 0;
}
static int mount_misc(const char *fstype, const char *dir)
{
if (mkdir(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);
if (stress(ramsizeGB, ncpus) < 0)
exit_failure();
exit_success();
}
