gettid() was introduced with glibc 2.30. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20200828110734.1638685-16-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
329 lines
8.1 KiB
C
329 lines
8.1 KiB
C
/*
|
|
* 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
|
|
|
|
#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 / PAGE_SIZE;
|
|
g_autofree char *ram = g_malloc(ramsizeMB * 1024 * 1024);
|
|
char *ramptr;
|
|
size_t i, j, k;
|
|
g_autofree char *data = g_malloc(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, 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 < 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 (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);
|
|
|
|
stress(ramsizeGB, ncpus);
|
|
|
|
exit_failure();
|
|
}
|