| 1 | #include <signal.h> |
| 2 | #ifdef CONFIG_VALGRIND_DEV |
| 3 | #include <valgrind/drd.h> |
| 4 | #else |
| 5 | #define DRD_IGNORE_VAR(x) do { } while (0) |
| 6 | #endif |
| 7 | |
| 8 | #include "fio.h" |
| 9 | #include "smalloc.h" |
| 10 | #include "helper_thread.h" |
| 11 | #include "steadystate.h" |
| 12 | #include "pshared.h" |
| 13 | |
| 14 | enum action { |
| 15 | A_EXIT = 1, |
| 16 | A_RESET = 2, |
| 17 | A_DO_STAT = 3, |
| 18 | }; |
| 19 | |
| 20 | static struct helper_data { |
| 21 | volatile int exit; |
| 22 | int pipe[2]; /* 0: read end; 1: write end. */ |
| 23 | struct sk_out *sk_out; |
| 24 | pthread_t thread; |
| 25 | struct fio_sem *startup_sem; |
| 26 | } *helper_data; |
| 27 | |
| 28 | void helper_thread_destroy(void) |
| 29 | { |
| 30 | if (!helper_data) |
| 31 | return; |
| 32 | |
| 33 | close(helper_data->pipe[0]); |
| 34 | close(helper_data->pipe[1]); |
| 35 | sfree(helper_data); |
| 36 | } |
| 37 | |
| 38 | #ifdef _WIN32 |
| 39 | static void sock_init(void) |
| 40 | { |
| 41 | WSADATA wsaData; |
| 42 | int res; |
| 43 | |
| 44 | /* It is allowed to call WSAStartup() more than once. */ |
| 45 | res = WSAStartup(MAKEWORD(2, 2), &wsaData); |
| 46 | assert(res == 0); |
| 47 | } |
| 48 | |
| 49 | static int make_nonblocking(int fd) |
| 50 | { |
| 51 | unsigned long arg = 1; |
| 52 | |
| 53 | return ioctlsocket(fd, FIONBIO, &arg); |
| 54 | } |
| 55 | |
| 56 | static int write_to_pipe(int fd, const void *buf, size_t len) |
| 57 | { |
| 58 | return send(fd, buf, len, 0); |
| 59 | } |
| 60 | |
| 61 | static int read_from_pipe(int fd, void *buf, size_t len) |
| 62 | { |
| 63 | return recv(fd, buf, len, 0); |
| 64 | } |
| 65 | #else |
| 66 | static void sock_init(void) |
| 67 | { |
| 68 | } |
| 69 | |
| 70 | static int make_nonblocking(int fd) |
| 71 | { |
| 72 | return fcntl(fd, F_SETFL, O_NONBLOCK); |
| 73 | } |
| 74 | |
| 75 | static int write_to_pipe(int fd, const void *buf, size_t len) |
| 76 | { |
| 77 | return write(fd, buf, len); |
| 78 | } |
| 79 | |
| 80 | static int read_from_pipe(int fd, void *buf, size_t len) |
| 81 | { |
| 82 | return read(fd, buf, len); |
| 83 | } |
| 84 | #endif |
| 85 | |
| 86 | static void submit_action(enum action a) |
| 87 | { |
| 88 | const char data = a; |
| 89 | int ret; |
| 90 | |
| 91 | if (!helper_data) |
| 92 | return; |
| 93 | |
| 94 | ret = write_to_pipe(helper_data->pipe[1], &data, sizeof(data)); |
| 95 | assert(ret == 1); |
| 96 | } |
| 97 | |
| 98 | void helper_reset(void) |
| 99 | { |
| 100 | submit_action(A_RESET); |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * May be invoked in signal handler context and hence must only call functions |
| 105 | * that are async-signal-safe. See also |
| 106 | * https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04_03. |
| 107 | */ |
| 108 | void helper_do_stat(void) |
| 109 | { |
| 110 | submit_action(A_DO_STAT); |
| 111 | } |
| 112 | |
| 113 | bool helper_should_exit(void) |
| 114 | { |
| 115 | if (!helper_data) |
| 116 | return true; |
| 117 | |
| 118 | return helper_data->exit; |
| 119 | } |
| 120 | |
| 121 | void helper_thread_exit(void) |
| 122 | { |
| 123 | if (!helper_data) |
| 124 | return; |
| 125 | |
| 126 | helper_data->exit = 1; |
| 127 | submit_action(A_EXIT); |
| 128 | pthread_join(helper_data->thread, NULL); |
| 129 | } |
| 130 | |
| 131 | static void *helper_thread_main(void *data) |
| 132 | { |
| 133 | struct helper_data *hd = data; |
| 134 | unsigned int msec_to_next_event, next_log, next_ss = STEADYSTATE_MSEC; |
| 135 | struct timespec ts, last_du, last_ss; |
| 136 | char action; |
| 137 | int ret = 0; |
| 138 | |
| 139 | sk_out_assign(hd->sk_out); |
| 140 | |
| 141 | #ifdef HAVE_PTHREAD_SIGMASK |
| 142 | { |
| 143 | sigset_t sigmask; |
| 144 | |
| 145 | /* Let another thread handle signals. */ |
| 146 | ret = pthread_sigmask(SIG_UNBLOCK, NULL, &sigmask); |
| 147 | assert(ret == 0); |
| 148 | ret = pthread_sigmask(SIG_BLOCK, &sigmask, NULL); |
| 149 | assert(ret == 0); |
| 150 | } |
| 151 | #endif |
| 152 | |
| 153 | #ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK |
| 154 | clock_gettime(CLOCK_MONOTONIC, &ts); |
| 155 | #else |
| 156 | clock_gettime(CLOCK_REALTIME, &ts); |
| 157 | #endif |
| 158 | memcpy(&last_du, &ts, sizeof(ts)); |
| 159 | memcpy(&last_ss, &ts, sizeof(ts)); |
| 160 | |
| 161 | fio_sem_up(hd->startup_sem); |
| 162 | |
| 163 | msec_to_next_event = DISK_UTIL_MSEC; |
| 164 | while (!ret && !hd->exit) { |
| 165 | uint64_t since_du, since_ss = 0; |
| 166 | struct timeval timeout = { |
| 167 | .tv_sec = DISK_UTIL_MSEC / 1000, |
| 168 | .tv_usec = (DISK_UTIL_MSEC % 1000) * 1000, |
| 169 | }; |
| 170 | fd_set rfds, efds; |
| 171 | |
| 172 | timespec_add_msec(&ts, msec_to_next_event); |
| 173 | |
| 174 | if (read_from_pipe(hd->pipe[0], &action, sizeof(action)) < 0) { |
| 175 | FD_ZERO(&rfds); |
| 176 | FD_SET(hd->pipe[0], &rfds); |
| 177 | FD_ZERO(&efds); |
| 178 | FD_SET(hd->pipe[0], &efds); |
| 179 | ret = select(1, &rfds, NULL, &efds, &timeout); |
| 180 | if (ret < 0) |
| 181 | log_err("fio: select() call in helper thread failed: %s", |
| 182 | strerror(errno)); |
| 183 | if (read_from_pipe(hd->pipe[0], &action, sizeof(action)) < |
| 184 | 0) |
| 185 | action = 0; |
| 186 | } |
| 187 | |
| 188 | #ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK |
| 189 | clock_gettime(CLOCK_MONOTONIC, &ts); |
| 190 | #else |
| 191 | clock_gettime(CLOCK_REALTIME, &ts); |
| 192 | #endif |
| 193 | |
| 194 | if (action == A_RESET) { |
| 195 | last_du = ts; |
| 196 | last_ss = ts; |
| 197 | } |
| 198 | |
| 199 | since_du = mtime_since(&last_du, &ts); |
| 200 | if (since_du >= DISK_UTIL_MSEC || DISK_UTIL_MSEC - since_du < 10) { |
| 201 | ret = update_io_ticks(); |
| 202 | timespec_add_msec(&last_du, DISK_UTIL_MSEC); |
| 203 | msec_to_next_event = DISK_UTIL_MSEC; |
| 204 | if (since_du >= DISK_UTIL_MSEC) |
| 205 | msec_to_next_event -= (since_du - DISK_UTIL_MSEC); |
| 206 | } else |
| 207 | msec_to_next_event = DISK_UTIL_MSEC - since_du; |
| 208 | |
| 209 | if (action == A_DO_STAT) |
| 210 | __show_running_run_stats(); |
| 211 | |
| 212 | next_log = calc_log_samples(); |
| 213 | if (!next_log) |
| 214 | next_log = DISK_UTIL_MSEC; |
| 215 | |
| 216 | if (steadystate_enabled) { |
| 217 | since_ss = mtime_since(&last_ss, &ts); |
| 218 | if (since_ss >= STEADYSTATE_MSEC || STEADYSTATE_MSEC - since_ss < 10) { |
| 219 | steadystate_check(); |
| 220 | timespec_add_msec(&last_ss, since_ss); |
| 221 | if (since_ss > STEADYSTATE_MSEC) |
| 222 | next_ss = STEADYSTATE_MSEC - (since_ss - STEADYSTATE_MSEC); |
| 223 | else |
| 224 | next_ss = STEADYSTATE_MSEC; |
| 225 | } else |
| 226 | next_ss = STEADYSTATE_MSEC - since_ss; |
| 227 | } |
| 228 | |
| 229 | msec_to_next_event = min(min(next_log, msec_to_next_event), next_ss); |
| 230 | dprint(FD_HELPERTHREAD, "since_ss: %llu, next_ss: %u, next_log: %u, msec_to_next_event: %u\n", (unsigned long long)since_ss, next_ss, next_log, msec_to_next_event); |
| 231 | |
| 232 | if (!is_backend) |
| 233 | print_thread_status(); |
| 234 | } |
| 235 | |
| 236 | fio_writeout_logs(false); |
| 237 | |
| 238 | sk_out_drop(); |
| 239 | return NULL; |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Connect two sockets to each other to emulate the pipe() system call on Windows. |
| 244 | */ |
| 245 | int pipe_over_loopback(int fd[2]) |
| 246 | { |
| 247 | struct sockaddr_in addr = { .sin_family = AF_INET }; |
| 248 | socklen_t len = sizeof(addr); |
| 249 | int res; |
| 250 | |
| 251 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 252 | |
| 253 | sock_init(); |
| 254 | |
| 255 | fd[0] = socket(AF_INET, SOCK_STREAM, 0); |
| 256 | if (fd[0] < 0) |
| 257 | goto err; |
| 258 | fd[1] = socket(AF_INET, SOCK_STREAM, 0); |
| 259 | if (fd[1] < 0) |
| 260 | goto close_fd_0; |
| 261 | res = bind(fd[0], (struct sockaddr *)&addr, len); |
| 262 | if (res < 0) |
| 263 | goto close_fd_1; |
| 264 | res = getsockname(fd[0], (struct sockaddr *)&addr, &len); |
| 265 | if (res < 0) |
| 266 | goto close_fd_1; |
| 267 | res = listen(fd[0], 1); |
| 268 | if (res < 0) |
| 269 | goto close_fd_1; |
| 270 | res = connect(fd[1], (struct sockaddr *)&addr, len); |
| 271 | if (res < 0) |
| 272 | goto close_fd_1; |
| 273 | res = accept(fd[0], NULL, NULL); |
| 274 | if (res < 0) |
| 275 | goto close_fd_1; |
| 276 | close(fd[0]); |
| 277 | fd[0] = res; |
| 278 | return 0; |
| 279 | |
| 280 | close_fd_1: |
| 281 | close(fd[1]); |
| 282 | |
| 283 | close_fd_0: |
| 284 | close(fd[0]); |
| 285 | |
| 286 | err: |
| 287 | return -1; |
| 288 | } |
| 289 | |
| 290 | int helper_thread_create(struct fio_sem *startup_sem, struct sk_out *sk_out) |
| 291 | { |
| 292 | struct helper_data *hd; |
| 293 | int ret; |
| 294 | |
| 295 | hd = scalloc(1, sizeof(*hd)); |
| 296 | |
| 297 | setup_disk_util(); |
| 298 | steadystate_setup(); |
| 299 | |
| 300 | hd->sk_out = sk_out; |
| 301 | |
| 302 | #if defined(CONFIG_PIPE2) |
| 303 | ret = pipe2(hd->pipe, O_CLOEXEC); |
| 304 | #elif defined(CONFIG_PIPE) |
| 305 | ret = pipe(hd->pipe); |
| 306 | #else |
| 307 | ret = pipe_over_loopback(hd->pipe); |
| 308 | #endif |
| 309 | if (ret) |
| 310 | return 1; |
| 311 | |
| 312 | ret = make_nonblocking(hd->pipe[0]); |
| 313 | assert(ret >= 0); |
| 314 | |
| 315 | hd->startup_sem = startup_sem; |
| 316 | |
| 317 | DRD_IGNORE_VAR(helper_data); |
| 318 | |
| 319 | ret = pthread_create(&hd->thread, NULL, helper_thread_main, hd); |
| 320 | if (ret) { |
| 321 | log_err("Can't create helper thread: %s\n", strerror(ret)); |
| 322 | return 1; |
| 323 | } |
| 324 | |
| 325 | helper_data = hd; |
| 326 | |
| 327 | dprint(FD_MUTEX, "wait on startup_sem\n"); |
| 328 | fio_sem_down(startup_sem); |
| 329 | dprint(FD_MUTEX, "done waiting on startup_sem\n"); |
| 330 | return 0; |
| 331 | } |