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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <limits.h>
#include <stdbool.h>
#include <pthread.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <syscall.h>
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \
(void) (&_min1 == &_min2); \
_min1 < _min2 ? _min1 : _min2; })
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
(void) (&_max1 == &_max2); \
_max1 > _max2 ? _max1 : _max2; })
#define MAX_CHUNK 4096
#define PAGE_SIZE 4096
#define pr_info(fmt, ...) \
printf("%8d: " fmt, sys_gettid(), ##__VA_ARGS__)
#define pr_err(fmt, ...) \
printf("%8d: Error (%s:%d): " fmt, sys_gettid(),\
__FILE__, __LINE__, ##__VA_ARGS__)
#define pr_perror(fmt, ...) \
pr_err(fmt ": %m\n", ##__VA_ARGS__)
#define pr_msg(fmt, ...) \
printf(fmt, ##__VA_ARGS__)
#define pr_trace(fmt, ...) \
printf("%8d: %s: " fmt, sys_gettid(), __func__, \
##__VA_ARGS__)
enum {
MEM_FILL_MODE_NONE = 0,
MEM_FILL_MODE_ALL = 1,
MEM_FILL_MODE_LIGHT = 2,
MEM_FILL_MODE_DIRTIFY = 3,
};
typedef struct {
pthread_mutex_t mutex;
pthread_mutexattr_t mutex_attr;
size_t opt_tasks;
size_t opt_files;
size_t opt_file_size;
int prev_fd[MAX_CHUNK];
size_t opt_mem;
size_t opt_mem_chunks;
size_t opt_mem_chunk_size;
int opt_mem_fill_mode;
int opt_mem_cycle_mode;
unsigned int opt_refresh_time;
char *opt_work_dir;
int work_dir_fd;
DIR *work_dir;
pid_t err_pid;
int err_no;
unsigned long prev_map[MAX_CHUNK];
} shared_data_t;
static shared_data_t *shared;
static int sys_gettid(void)
{
return syscall(__NR_gettid);
}
static void dirtify_memory(unsigned long *chunks, size_t nr_chunks,
size_t chunk_size, int mode, const size_t nr_pages)
{
void *page;
size_t i;
pr_trace("filling memory\n");
switch (mode) {
case MEM_FILL_MODE_LIGHT:
*((unsigned long *)chunks[0]) = -1ul;
break;
case MEM_FILL_MODE_ALL:
for (i = 0; i < nr_chunks; i++)
memset((void *)chunks[i], (char)i, chunk_size);
break;
case MEM_FILL_MODE_DIRTIFY:
for (i = 0; i < nr_chunks; i++)
*((unsigned long *)chunks[i]) = -1ul;
break;
}
}
static void dirtify_files(int *fd, size_t nr_files, size_t size)
{
size_t buf[8192];
size_t i, j, c;
/*
* Note we don't write any _sane_ data here, the only
* important thing is I/O activity by self.
*/
for (i = 0; i < nr_files; i++) {
size_t c = min(size, sizeof(buf));
size_t left = size;
while (left > 0) {
write(fd[i], buf, c);
left -= c;
c = min(left, sizeof(buf));
}
}
}
static int create_files(shared_data_t *shared, int *fd, size_t nr_files)
{
char path[PATH_MAX];
size_t i;
memset(fd, 0xff, sizeof(fd));
pr_info("\tCreating %lu files\n", shared->opt_files);
for (i = 0; i < shared->opt_files; i++) {
if (shared->prev_fd[i] != -1) {
close(shared->prev_fd[i]);
shared->prev_fd[i] = -1;
}
snprintf(path, sizeof(path), "%08d-%04d-temp", sys_gettid(), i);
fd[i] = openat(shared->work_dir_fd, path, O_RDWR | O_CREAT | O_TRUNC, 0666);
if (fd[i] < 0) {
pr_perror("Can't open %s/%s", shared->opt_work_dir, path);
shared->err_pid = sys_gettid();
shared->err_no = -errno;
return -1;
}
shared->prev_fd[i] = fd[i];
}
return 0;
}
static void work_on_fork(shared_data_t *shared)
{
const size_t nr_pages = shared->opt_mem_chunk_size / PAGE_SIZE;
unsigned long chunks[MAX_CHUNK] = { };
int fd[MAX_CHUNK];
size_t i;
void *mem;
pr_trace("locking\n");
pthread_mutex_lock(&shared->mutex);
pr_trace("init\n");
pr_info("\tCreating %lu mmaps each %lu K\n",
shared->opt_mem_chunks, shared->opt_mem_chunk_size >> 10);
for (i = 0; i < shared->opt_mem_chunks; i++) {
if (shared->prev_map[i]) {
munmap((void *)shared->prev_map[i], shared->opt_mem_chunk_size);
shared->prev_map[i] = 0;
}
/* If we won't change proto here, the kernel might merge close areas */
mem = mmap(NULL, shared->opt_mem_chunk_size,
PROT_READ | PROT_WRITE | ((i % 2) ? PROT_EXEC : 0),
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (mem != (void *)MAP_FAILED) {
shared->prev_map[i] = (unsigned long)mem;
chunks[i] = (unsigned long)mem;
pr_info("\t\tMap at %lx\n",(unsigned long)mem);
} else {
pr_info("\t\tCan't map\n");
shared->err_pid = sys_gettid();
shared->err_no = -errno;
exit(1);
}
}
if (shared->opt_mem_fill_mode)
dirtify_memory(chunks, shared->opt_mem_chunks,
shared->opt_mem_chunk_size,
shared->opt_mem_fill_mode,
nr_pages);
if (create_files(shared, fd, shared->opt_files))
exit(1);
if (shared->opt_file_size)
dirtify_files(fd, shared->opt_files, shared->opt_file_size);
pr_trace("releasing\n");
pthread_mutex_unlock(&shared->mutex);
while (1) {
sleep(shared->opt_refresh_time);
if (shared->opt_mem_cycle_mode)
dirtify_memory(chunks, shared->opt_mem_chunks,
shared->opt_mem_chunk_size,
shared->opt_mem_cycle_mode,
nr_pages);
if (shared->opt_file_size)
dirtify_files(fd, shared->opt_files, shared->opt_file_size);
}
}
static int parse_mem_mode(int *mode, char *opt)
{
if (!strcmp(opt, "all")) {
*mode = MEM_FILL_MODE_ALL;
} else if (!strcmp(opt, "light")) {
*mode = MEM_FILL_MODE_LIGHT;
} else if (!strcmp(opt, "dirtify")) {
*mode = MEM_FILL_MODE_DIRTIFY;
} else {
pr_err("Unrecognized option %s\n", opt);
return -1;
}
return 0;
}
int main(int argc, char *argv[])
{
/* a - 97, z - 122, A - 65, 90 */
static const char short_opts[] = "t:d:f:m:c:h";
static struct option long_opts[] = {
{"tasks", required_argument, 0, 't'},
{"dir", required_argument, 0, 'd'},
{"files", required_argument, 0, 'f'},
{"memory", required_argument, 0, 'm'},
{"mem-chunks", required_argument, 0, 'c'},
{"help", no_argument, 0, 'h'},
{"mem-fill", required_argument, 0, 10},
{"mem-cycle", required_argument, 0, 11},
{"refresh", required_argument, 0, 12},
{"file-size", required_argument, 0, 13},
{ },
};
char workdir[PATH_MAX];
int opt, idx, pidfd;
char pidbuf[32];
int status;
pid_t pid;
size_t i;
shared = (void *)mmap(NULL, sizeof(*shared), PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_SHARED, -1, 0);
if ((void *)shared == MAP_FAILED) {
pr_err("Failed to setup shared data\n");
exit(1);
}
pthread_mutexattr_init(&shared->mutex_attr);
pthread_mutexattr_setpshared(&shared->mutex_attr, PTHREAD_PROCESS_SHARED);
pthread_mutex_init(&shared->mutex, &shared->mutex_attr);
/*
* Default options.
*/
shared->opt_mem_chunks = 1;
shared->opt_refresh_time = 1;
shared->opt_tasks = 1;
shared->opt_mem = 1 << 20ul;
memset(shared->prev_fd, 0xff, sizeof(shared->prev_fd));
while (1) {
idx = -1;
opt = getopt_long(argc, argv, short_opts, long_opts, &idx);
if (opt == -1)
break;
switch(opt) {
case 't':
shared->opt_tasks = (size_t)atol(optarg);
break;
case 'f':
shared->opt_files = (size_t)atol(optarg);
break;
case 'm':
/* In megabytes */
shared->opt_mem = (size_t)atol(optarg) << 20ul;
break;
case 'c':
shared->opt_mem_chunks = (size_t)atol(optarg);
break;
case 'd':
shared->opt_work_dir = optarg;
break;
case 'h':
goto usage;
break;
case 10:
if (parse_mem_mode(&shared->opt_mem_fill_mode, optarg))
goto usage;
case 11:
if (parse_mem_mode(&shared->opt_mem_cycle_mode, optarg))
goto usage;
break;
case 12:
shared->opt_refresh_time = (unsigned int)atoi(optarg);
break;
case 13:
shared->opt_file_size = (size_t)atol(optarg);
}
}
if (!shared->opt_work_dir) {
shared->opt_work_dir = getcwd(workdir, sizeof(workdir));
if (!shared->opt_work_dir) {
pr_perror("Can't fetch current working dir");
exit(1);
}
shared->opt_work_dir = workdir;
}
if (shared->opt_mem_chunks > MAX_CHUNK)
shared->opt_mem_chunks = MAX_CHUNK;
if (shared->opt_files > MAX_CHUNK)
shared->opt_files = MAX_CHUNK;
shared->work_dir = opendir(shared->opt_work_dir);
if (!shared->work_dir) {
pr_perror("Can't open working dir `%s'",
shared->opt_work_dir);
exit(1);
}
shared->work_dir_fd = dirfd(shared->work_dir);
shared->opt_mem_chunk_size = shared->opt_mem / shared->opt_mem_chunks;
if (shared->opt_mem_chunk_size &&
shared->opt_mem_chunk_size < PAGE_SIZE) {
pr_err("Memory chunk size is too small, provide at least %lu M of memory\n",
(shared->opt_mem_chunks * PAGE_SIZE) >> 20ul);
exit(1);
}
for (i = 0; i < shared->opt_tasks; i++) {
if (shared->err_no)
goto err_child;
pid = fork();
if (pid < 0) {
printf("Can't create fork: %m\n");
exit(1);
} else if (pid == 0) {
work_on_fork(shared);
}
}
/*
* Once everything is done and we're in cycle,
* create pidfile and go to sleep...
*/
pid = sys_gettid();
pidfd = openat(shared->work_dir_fd, "bers.pid", O_RDWR | O_CREAT | O_TRUNC, 0666);
if (pidfd < 0) {
pr_perror("Can't open pidfile");
exit(1);
}
snprintf(pidbuf, sizeof(pidbuf), "%d", sys_gettid());
write(pidfd, pidbuf, strlen(pidbuf));
close(pidfd);
pidfd = -1;
/*
* Endless!
*/
while (!shared->err_no)
sleep(1);
err_child:
pr_err("Child %d exited with %d\n",
shared->err_pid, shared->err_no);
return shared->err_no;
usage:
pr_msg("bers [options]\n");
pr_msg(" -t|--tasks <num> create <num> of tasks\n");
pr_msg(" -d|--dir <dir> use directory <dir> for temporary files\n");
pr_msg(" -f|--files <num> create <num> files for each task\n");
pr_msg(" -m|--memory <num> allocate <num> megabytes for each task\n");
pr_msg(" --memory-chunks <num> split memory to <num> equal parts\n");
pr_msg(" --mem-fill <mode> fill memory with data dependin on <mode>:\n");
pr_msg(" all fill every byte of memory\n");
pr_msg(" light fill first bytes of every page\n");
pr_msg(" dirtify fill every page\n");
pr_msg(" --mem-cycle <mode> same as --mem-fill but for cycling\n");
pr_msg(" --refresh <second> refresh loading of every task each <second>\n");
pr_msg(" --file-size <bytes> write <bytes> of data into each file on every refresh cycle\n");
return 1;
}
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