+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#ifdef CONFIG_HAVE_TIMERFD_CREATE
+#include <sys/timerfd.h>
+#endif
#ifdef CONFIG_VALGRIND_DEV
#include <valgrind/drd.h>
#else
#define DRD_IGNORE_VAR(x) do { } while (0)
#endif
+#ifdef WIN32
+#include "os/os-windows.h"
+#endif
+
#include "fio.h"
#include "smalloc.h"
#include "helper_thread.h"
#include "steadystate.h"
#include "pshared.h"
+static int sleep_accuracy_ms;
+static int timerfd = -1;
+
enum action {
A_EXIT = 1,
A_RESET = 2,
struct fio_sem *startup_sem;
} *helper_data;
+struct interval_timer {
+ const char *name;
+ struct timespec expires;
+ uint32_t interval_ms;
+ int (*func)(void);
+};
+
void helper_thread_destroy(void)
{
+ if (!helper_data)
+ return;
+
close(helper_data->pipe[0]);
close(helper_data->pipe[1]);
sfree(helper_data);
}
+#ifdef _WIN32
+static void sock_init(void)
+{
+ WSADATA wsaData;
+ int res;
+
+ /* It is allowed to call WSAStartup() more than once. */
+ res = WSAStartup(MAKEWORD(2, 2), &wsaData);
+ assert(res == 0);
+}
+
+static int make_nonblocking(int fd)
+{
+ unsigned long arg = 1;
+
+ return ioctlsocket(fd, FIONBIO, &arg);
+}
+
+static int write_to_pipe(int fd, const void *buf, size_t len)
+{
+ return send(fd, buf, len, 0);
+}
+
+static int read_from_pipe(int fd, void *buf, size_t len)
+{
+ return recv(fd, buf, len, 0);
+}
+#else
+static void sock_init(void)
+{
+}
+
+static int make_nonblocking(int fd)
+{
+ return fcntl(fd, F_SETFL, O_NONBLOCK);
+}
+
+static int write_to_pipe(int fd, const void *buf, size_t len)
+{
+ return write(fd, buf, len);
+}
+
+static int read_from_pipe(int fd, void *buf, size_t len)
+{
+ return read(fd, buf, len);
+}
+#endif
+
+static void block_signals(void)
+{
+#ifdef CONFIG_PTHREAD_SIGMASK
+ sigset_t sigmask;
+
+ int ret;
+
+ ret = pthread_sigmask(SIG_UNBLOCK, NULL, &sigmask);
+ assert(ret == 0);
+ ret = pthread_sigmask(SIG_BLOCK, &sigmask, NULL);
+#endif
+}
+
static void submit_action(enum action a)
{
- const uint8_t data = a;
+ const char data = a;
int ret;
if (!helper_data)
return;
- ret = write(helper_data->pipe[1], &data, sizeof(data));
- assert(ret == 1);
+ ret = write_to_pipe(helper_data->pipe[1], &data, sizeof(data));
+ if (ret != 1) {
+ log_err("failed to write action into pipe, err %i:%s", errno, strerror(errno));
+ assert(0);
+ }
}
void helper_reset(void)
void helper_thread_exit(void)
{
+ if (!helper_data)
+ return;
+
helper_data->exit = 1;
- submit_action(A_EXIT);
pthread_join(helper_data->thread, NULL);
}
+/* Resets timers and returns the time in milliseconds until the next event. */
+static int reset_timers(struct interval_timer timer[], int num_timers,
+ struct timespec *now)
+{
+ uint32_t msec_to_next_event = INT_MAX;
+ int i;
+
+ for (i = 0; i < num_timers; ++i) {
+ timer[i].expires = *now;
+ timespec_add_msec(&timer[i].expires, timer[i].interval_ms);
+ msec_to_next_event = min_not_zero(msec_to_next_event,
+ timer[i].interval_ms);
+ }
+
+ return msec_to_next_event;
+}
+
+/*
+ * Waits for an action from fd during at least timeout_ms. `fd` must be in
+ * non-blocking mode.
+ */
+static uint8_t wait_for_action(int fd, unsigned int timeout_ms)
+{
+ struct timeval timeout = {
+ .tv_sec = timeout_ms / 1000,
+ .tv_usec = (timeout_ms % 1000) * 1000,
+ };
+ fd_set rfds, efds;
+ uint8_t action = 0;
+ uint64_t exp;
+ int res;
+
+ res = read_from_pipe(fd, &action, sizeof(action));
+ if (res > 0 || timeout_ms == 0)
+ return action;
+ FD_ZERO(&rfds);
+ FD_SET(fd, &rfds);
+ FD_ZERO(&efds);
+ FD_SET(fd, &efds);
+#ifdef CONFIG_HAVE_TIMERFD_CREATE
+ {
+ /*
+ * If the timer frequency is 100 Hz, select() will round up
+ * `timeout` to the next multiple of 1 / 100 Hz = 10 ms. Hence
+ * use a high-resolution timer if possible to increase
+ * select() timeout accuracy.
+ */
+ struct itimerspec delta = {};
+
+ delta.it_value.tv_sec = timeout.tv_sec;
+ delta.it_value.tv_nsec = timeout.tv_usec * 1000;
+ res = timerfd_settime(timerfd, 0, &delta, NULL);
+ assert(res == 0);
+ FD_SET(timerfd, &rfds);
+ }
+#endif
+ res = select(max(fd, timerfd) + 1, &rfds, NULL, &efds,
+ timerfd >= 0 ? NULL : &timeout);
+ if (res < 0) {
+ log_err("fio: select() call in helper thread failed: %s",
+ strerror(errno));
+ return A_EXIT;
+ }
+ if (FD_ISSET(fd, &rfds))
+ read_from_pipe(fd, &action, sizeof(action));
+ if (timerfd >= 0 && FD_ISSET(timerfd, &rfds)) {
+ res = read(timerfd, &exp, sizeof(exp));
+ assert(res == sizeof(exp));
+ }
+ return action;
+}
+
+/*
+ * Verify whether or not timer @it has expired. If timer @it has expired, call
+ * @it->func(). @now is the current time. @msec_to_next_event is an
+ * input/output parameter that represents the time until the next event.
+ */
+static int eval_timer(struct interval_timer *it, const struct timespec *now,
+ unsigned int *msec_to_next_event)
+{
+ int64_t delta_ms;
+ bool expired;
+
+ /* interval == 0 means that the timer is disabled. */
+ if (it->interval_ms == 0)
+ return 0;
+
+ delta_ms = rel_time_since(now, &it->expires);
+ expired = delta_ms <= sleep_accuracy_ms;
+ if (expired) {
+ timespec_add_msec(&it->expires, it->interval_ms);
+ delta_ms = rel_time_since(now, &it->expires);
+ if (delta_ms < it->interval_ms - sleep_accuracy_ms ||
+ delta_ms > it->interval_ms + sleep_accuracy_ms) {
+ dprint(FD_HELPERTHREAD,
+ "%s: delta = %" PRIi64 " <> %u. Clock jump?\n",
+ it->name, delta_ms, it->interval_ms);
+ delta_ms = it->interval_ms;
+ it->expires = *now;
+ timespec_add_msec(&it->expires, it->interval_ms);
+ }
+ }
+ *msec_to_next_event = min((unsigned int)delta_ms, *msec_to_next_event);
+ return expired ? it->func() : 0;
+}
+
static void *helper_thread_main(void *data)
{
struct helper_data *hd = data;
- unsigned int msec_to_next_event, next_log, next_ss = STEADYSTATE_MSEC;
- struct timespec ts, last_du, last_ss;
- uint8_t action;
+ unsigned int msec_to_next_event, next_log;
+ struct interval_timer timer[] = {
+ {
+ .name = "disk_util",
+ .interval_ms = DISK_UTIL_MSEC,
+ .func = update_io_ticks,
+ },
+ {
+ .name = "status_interval",
+ .interval_ms = status_interval,
+ .func = __show_running_run_stats,
+ },
+ {
+ .name = "steadystate",
+ .interval_ms = steadystate_enabled ? ss_check_interval :
+ 0,
+ .func = steadystate_check,
+ }
+ };
+ struct timespec ts;
+ long clk_tck;
int ret = 0;
- sk_out_assign(hd->sk_out);
+ os_clk_tck(&clk_tck);
-#ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK
- clock_gettime(CLOCK_MONOTONIC, &ts);
-#else
- clock_gettime(CLOCK_REALTIME, &ts);
+ dprint(FD_HELPERTHREAD, "clk_tck = %ld\n", clk_tck);
+ assert(clk_tck > 0);
+ sleep_accuracy_ms = (1000 + clk_tck - 1) / clk_tck;
+
+#ifdef CONFIG_HAVE_TIMERFD_CREATE
+ timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+ assert(timerfd >= 0);
+ sleep_accuracy_ms = 1;
#endif
- memcpy(&last_du, &ts, sizeof(ts));
- memcpy(&last_ss, &ts, sizeof(ts));
+
+ sk_out_assign(hd->sk_out);
+
+ /* Let another thread handle signals. */
+ block_signals();
+
+ fio_get_mono_time(&ts);
+ msec_to_next_event = reset_timers(timer, FIO_ARRAY_SIZE(timer), &ts);
fio_sem_up(hd->startup_sem);
- msec_to_next_event = DISK_UTIL_MSEC;
while (!ret && !hd->exit) {
- uint64_t since_du, since_ss = 0;
- struct timeval timeout = {
- .tv_sec = DISK_UTIL_MSEC / 1000,
- .tv_usec = (DISK_UTIL_MSEC % 1000) * 1000,
- };
- fd_set rfds, efds;
-
- timespec_add_msec(&ts, msec_to_next_event);
-
- if (read(hd->pipe[0], &action, sizeof(action)) < 0) {
- FD_ZERO(&rfds);
- FD_SET(hd->pipe[0], &rfds);
- FD_ZERO(&efds);
- FD_SET(hd->pipe[0], &efds);
- select(1, &rfds, NULL, &efds, &timeout);
- if (read(hd->pipe[0], &action, sizeof(action)) < 0)
- action = 0;
- }
+ uint8_t action;
+ int i;
-#ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK
- clock_gettime(CLOCK_MONOTONIC, &ts);
-#else
- clock_gettime(CLOCK_REALTIME, &ts);
-#endif
+ action = wait_for_action(hd->pipe[0], msec_to_next_event);
+ if (action == A_EXIT)
+ break;
- if (action == A_RESET) {
- last_du = ts;
- last_ss = ts;
- }
+ fio_get_mono_time(&ts);
+
+ msec_to_next_event = INT_MAX;
- since_du = mtime_since(&last_du, &ts);
- if (since_du >= DISK_UTIL_MSEC || DISK_UTIL_MSEC - since_du < 10) {
- ret = update_io_ticks();
- timespec_add_msec(&last_du, DISK_UTIL_MSEC);
- msec_to_next_event = DISK_UTIL_MSEC;
- if (since_du >= DISK_UTIL_MSEC)
- msec_to_next_event -= (since_du - DISK_UTIL_MSEC);
- } else
- msec_to_next_event = DISK_UTIL_MSEC - since_du;
+ if (action == A_RESET)
+ msec_to_next_event = reset_timers(timer,
+ FIO_ARRAY_SIZE(timer), &ts);
+
+ for (i = 0; i < FIO_ARRAY_SIZE(timer); ++i)
+ ret = eval_timer(&timer[i], &ts, &msec_to_next_event);
if (action == A_DO_STAT)
__show_running_run_stats();
if (!next_log)
next_log = DISK_UTIL_MSEC;
- if (steadystate_enabled) {
- since_ss = mtime_since(&last_ss, &ts);
- if (since_ss >= STEADYSTATE_MSEC || STEADYSTATE_MSEC - since_ss < 10) {
- steadystate_check();
- timespec_add_msec(&last_ss, since_ss);
- if (since_ss > STEADYSTATE_MSEC)
- next_ss = STEADYSTATE_MSEC - (since_ss - STEADYSTATE_MSEC);
- else
- next_ss = STEADYSTATE_MSEC;
- } else
- next_ss = STEADYSTATE_MSEC - since_ss;
- }
-
- msec_to_next_event = min(min(next_log, msec_to_next_event), next_ss);
- 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);
+ msec_to_next_event = min(next_log, msec_to_next_event);
+ dprint(FD_HELPERTHREAD,
+ "next_log: %u, msec_to_next_event: %u\n",
+ next_log, msec_to_next_event);
if (!is_backend)
print_thread_status();
}
+ if (timerfd >= 0) {
+ close(timerfd);
+ timerfd = -1;
+ }
+
fio_writeout_logs(false);
sk_out_drop();
return NULL;
}
+/*
+ * Connect two sockets to each other to emulate the pipe() system call on Windows.
+ */
+int pipe_over_loopback(int fd[2])
+{
+ struct sockaddr_in addr = { .sin_family = AF_INET };
+ socklen_t len = sizeof(addr);
+ int res;
+
+ addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+ sock_init();
+
+ fd[0] = socket(AF_INET, SOCK_STREAM, 0);
+ if (fd[0] < 0)
+ goto err;
+ fd[1] = socket(AF_INET, SOCK_STREAM, 0);
+ if (fd[1] < 0)
+ goto close_fd_0;
+ res = bind(fd[0], (struct sockaddr *)&addr, len);
+ if (res < 0)
+ goto close_fd_1;
+ res = getsockname(fd[0], (struct sockaddr *)&addr, &len);
+ if (res < 0)
+ goto close_fd_1;
+ res = listen(fd[0], 1);
+ if (res < 0)
+ goto close_fd_1;
+ res = connect(fd[1], (struct sockaddr *)&addr, len);
+ if (res < 0)
+ goto close_fd_1;
+ res = accept(fd[0], NULL, NULL);
+ if (res < 0)
+ goto close_fd_1;
+ close(fd[0]);
+ fd[0] = res;
+ return 0;
+
+close_fd_1:
+ close(fd[1]);
+
+close_fd_0:
+ close(fd[0]);
+
+err:
+ return -1;
+}
+
int helper_thread_create(struct fio_sem *startup_sem, struct sk_out *sk_out)
{
struct helper_data *hd;
hd->sk_out = sk_out;
-#ifdef __linux__
+#if defined(CONFIG_PIPE2)
ret = pipe2(hd->pipe, O_CLOEXEC);
-#else
+#elif defined(CONFIG_PIPE)
ret = pipe(hd->pipe);
+#else
+ ret = pipe_over_loopback(hd->pipe);
#endif
if (ret)
return 1;
- ret = fcntl(hd->pipe[0], F_SETFL, O_NONBLOCK);
+ ret = make_nonblocking(hd->pipe[0]);
assert(ret >= 0);
hd->startup_sem = startup_sem;
projects / fio.git / blobdiff