tests/migration/stress.c - qemu - Git at Google

 /*
  * 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 = 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();
 }
	/*
	* 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 = 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();
	}