[fio.git] / helper_thread.c

#include <signal.h>
#ifdef CONFIG_VALGRIND_DEV
#include <valgrind/drd.h>
#else
#define DRD_IGNORE_VAR(x) do { } while (0)
#endif

#include "fio.h"
#include "smalloc.h"
#include "helper_thread.h"
#include "steadystate.h"
#include "pshared.h"

enum action {
	A_EXIT		= 1,
	A_RESET		= 2,
	A_DO_STAT	= 3,
};

static struct helper_data {
	volatile int exit;
	int pipe[2]; /* 0: read end; 1: write end. */
	struct sk_out *sk_out;
	pthread_t thread;
	struct fio_sem *startup_sem;
} *helper_data;

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 submit_action(enum action a)
{
	const char data = a;
	int ret;

	if (!helper_data)
		return;

	ret = write_to_pipe(helper_data->pipe[1], &data, sizeof(data));
	assert(ret == 1);
}

void helper_reset(void)
{
	submit_action(A_RESET);
}

/*
 * May be invoked in signal handler context and hence must only call functions
 * that are async-signal-safe. See also
 * https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04_03.
 */
void helper_do_stat(void)
{
	submit_action(A_DO_STAT);
}

bool helper_should_exit(void)
{
	if (!helper_data)
		return true;

	return helper_data->exit;
}

void helper_thread_exit(void)
{
	if (!helper_data)
		return;

	helper_data->exit = 1;
	submit_action(A_EXIT);
	pthread_join(helper_data->thread, NULL);
}

static unsigned int task_helper(struct timespec *last, struct timespec *now, unsigned int period, void do_task())
{
	unsigned int next, since;

	since = mtime_since(last, now);
	if (since >= period || period - since < 10) {
		do_task();
		timespec_add_msec(last, since);
		if (since > period)
			next = period - (since - period);
		else
			next = period;
	} else
		next = period - since;

	return next;
}

static void *helper_thread_main(void *data)
{
	struct helper_data *hd = data;
	unsigned int msec_to_next_event, next_log, next_si = status_interval;
	unsigned int next_ss = STEADYSTATE_MSEC;
	struct timespec ts, last_du, last_ss, last_si;
	char action;
	int ret = 0;

	sk_out_assign(hd->sk_out);

#ifdef HAVE_PTHREAD_SIGMASK
	{
	sigset_t sigmask;

	/* Let another thread handle signals. */
	ret = pthread_sigmask(SIG_UNBLOCK, NULL, &sigmask);
	assert(ret == 0);
	ret = pthread_sigmask(SIG_BLOCK, &sigmask, NULL);
	assert(ret == 0);
	}
#endif

	fio_get_mono_time(&ts);
	memcpy(&last_du, &ts, sizeof(ts));
	memcpy(&last_ss, &ts, sizeof(ts));
	memcpy(&last_si, &ts, sizeof(ts));

	fio_sem_up(hd->startup_sem);

	msec_to_next_event = DISK_UTIL_MSEC;
	while (!ret && !hd->exit) {
		uint64_t since_du;
		struct timeval timeout = {
			.tv_sec  = msec_to_next_event / 1000,
			.tv_usec = (msec_to_next_event % 1000) * 1000,
		};
		fd_set rfds, efds;

		if (read_from_pipe(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);
			if (select(1, &rfds, NULL, &efds, &timeout) < 0) {
				log_err("fio: select() call in helper thread failed: %s",
					strerror(errno));
				ret = 1;
			}
			if (read_from_pipe(hd->pipe[0], &action, sizeof(action)) <
			    0)
				action = 0;
		}

		fio_get_mono_time(&ts);

		if (action == A_RESET) {
			last_du = ts;
			last_ss = ts;
		}

		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_DO_STAT)
			__show_running_run_stats();

		if (status_interval) {
			next_si = task_helper(&last_si, &ts, status_interval, __show_running_run_stats);
			msec_to_next_event = min(next_si, msec_to_next_event);
		}

		next_log = calc_log_samples();
		if (!next_log)
			next_log = DISK_UTIL_MSEC;

		if (steadystate_enabled) {
			next_ss = task_helper(&last_ss, &ts, STEADYSTATE_MSEC, steadystate_check);
			msec_to_next_event = min(next_ss, msec_to_next_event);
                }

		msec_to_next_event = min(next_log, msec_to_next_event);
		dprint(FD_HELPERTHREAD, "next_si: %u, next_ss: %u, next_log: %u, msec_to_next_event: %u\n",
			next_si, next_ss, next_log, msec_to_next_event);

		if (!is_backend)
			print_thread_status();
	}

	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;
	int ret;

	hd = scalloc(1, sizeof(*hd));

	setup_disk_util();
	steadystate_setup();

	hd->sk_out = sk_out;

#if defined(CONFIG_PIPE2)
	ret = pipe2(hd->pipe, O_CLOEXEC);
#elif defined(CONFIG_PIPE)
	ret = pipe(hd->pipe);
#else
	ret = pipe_over_loopback(hd->pipe);
#endif
	if (ret)
		return 1;

	ret = make_nonblocking(hd->pipe[0]);
	assert(ret >= 0);

	hd->startup_sem = startup_sem;

	DRD_IGNORE_VAR(helper_data);

	ret = pthread_create(&hd->thread, NULL, helper_thread_main, hd);
	if (ret) {
		log_err("Can't create helper thread: %s\n", strerror(ret));
		return 1;
	}

	helper_data = hd;

	dprint(FD_MUTEX, "wait on startup_sem\n");
	fio_sem_down(startup_sem);
	dprint(FD_MUTEX, "done waiting on startup_sem\n");
	return 0;
}
Commit	Line	Data
	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 unsigned int task_helper(struct timespec last, struct timespec now, unsigned int period, void do_task())
	132	{
	133	unsigned int next, since;
	134
	135	since = mtime_since(last, now);
	136	if (since >= period \|\| period - since < 10) {
	137	do_task();
	138	timespec_add_msec(last, since);
	139	if (since > period)
	140	next = period - (since - period);
	141	else
	142	next = period;
	143	} else
	144	next = period - since;
	145
	146	return next;
	147	}
	148
	149	static void helper_thread_main(void data)
	150	{
	151	struct helper_data *hd = data;
	152	unsigned int msec_to_next_event, next_log, next_si = status_interval;
	153	unsigned int next_ss = STEADYSTATE_MSEC;
	154	struct timespec ts, last_du, last_ss, last_si;
	155	char action;
	156	int ret = 0;
	157
	158	sk_out_assign(hd->sk_out);
	159
	160	#ifdef HAVE_PTHREAD_SIGMASK
	161	{
	162	sigset_t sigmask;
	163
	164	/* Let another thread handle signals. */
	165	ret = pthread_sigmask(SIG_UNBLOCK, NULL, &sigmask);
	166	assert(ret == 0);
	167	ret = pthread_sigmask(SIG_BLOCK, &sigmask, NULL);
	168	assert(ret == 0);
	169	}
	170	#endif
	171
	172	fio_get_mono_time(&ts);
	173	memcpy(&last_du, &ts, sizeof(ts));
	174	memcpy(&last_ss, &ts, sizeof(ts));
	175	memcpy(&last_si, &ts, sizeof(ts));
	176
	177	fio_sem_up(hd->startup_sem);
	178
	179	msec_to_next_event = DISK_UTIL_MSEC;
	180	while (!ret && !hd->exit) {
	181	uint64_t since_du;
	182	struct timeval timeout = {
	183	.tv_sec = msec_to_next_event / 1000,
	184	.tv_usec = (msec_to_next_event % 1000) * 1000,
	185	};
	186	fd_set rfds, efds;
	187
	188	if (read_from_pipe(hd->pipe[0], &action, sizeof(action)) < 0) {
	189	FD_ZERO(&rfds);
	190	FD_SET(hd->pipe[0], &rfds);
	191	FD_ZERO(&efds);
	192	FD_SET(hd->pipe[0], &efds);
	193	if (select(1, &rfds, NULL, &efds, &timeout) < 0) {
	194	log_err("fio: select() call in helper thread failed: %s",
	195	strerror(errno));
	196	ret = 1;
	197	}
	198	if (read_from_pipe(hd->pipe[0], &action, sizeof(action)) <
	199	0)
	200	action = 0;
	201	}
	202
	203	fio_get_mono_time(&ts);
	204
	205	if (action == A_RESET) {
	206	last_du = ts;
	207	last_ss = ts;
	208	}
	209
	210	since_du = mtime_since(&last_du, &ts);
	211	if (since_du >= DISK_UTIL_MSEC \|\| DISK_UTIL_MSEC - since_du < 10) {
	212	ret = update_io_ticks();
	213	timespec_add_msec(&last_du, DISK_UTIL_MSEC);
	214	msec_to_next_event = DISK_UTIL_MSEC;
	215	if (since_du >= DISK_UTIL_MSEC)
	216	msec_to_next_event -= (since_du - DISK_UTIL_MSEC);
	217	} else
	218	msec_to_next_event = DISK_UTIL_MSEC - since_du;
	219
	220	if (action == A_DO_STAT)
	221	__show_running_run_stats();
	222
	223	if (status_interval) {
	224	next_si = task_helper(&last_si, &ts, status_interval, __show_running_run_stats);
	225	msec_to_next_event = min(next_si, msec_to_next_event);
	226	}
	227
	228	next_log = calc_log_samples();
	229	if (!next_log)
	230	next_log = DISK_UTIL_MSEC;
	231
	232	if (steadystate_enabled) {
	233	next_ss = task_helper(&last_ss, &ts, STEADYSTATE_MSEC, steadystate_check);
	234	msec_to_next_event = min(next_ss, msec_to_next_event);
	235	}
	236
	237	msec_to_next_event = min(next_log, msec_to_next_event);
	238	dprint(FD_HELPERTHREAD, "next_si: %u, next_ss: %u, next_log: %u, msec_to_next_event: %u\n",
	239	next_si, next_ss, next_log, msec_to_next_event);
	240
	241	if (!is_backend)
	242	print_thread_status();
	243	}
	244
	245	fio_writeout_logs(false);
	246
	247	sk_out_drop();
	248	return NULL;
	249	}
	250
	251	/*
	252	* Connect two sockets to each other to emulate the pipe() system call on Windows.
	253	*/
	254	int pipe_over_loopback(int fd[2])
	255	{
	256	struct sockaddr_in addr = { .sin_family = AF_INET };
	257	socklen_t len = sizeof(addr);
	258	int res;
	259
	260	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	261
	262	sock_init();
	263
	264	fd[0] = socket(AF_INET, SOCK_STREAM, 0);
	265	if (fd[0] < 0)
	266	goto err;
	267	fd[1] = socket(AF_INET, SOCK_STREAM, 0);
	268	if (fd[1] < 0)
	269	goto close_fd_0;
	270	res = bind(fd[0], (struct sockaddr *)&addr, len);
	271	if (res < 0)
	272	goto close_fd_1;
	273	res = getsockname(fd[0], (struct sockaddr *)&addr, &len);
	274	if (res < 0)
	275	goto close_fd_1;
	276	res = listen(fd[0], 1);
	277	if (res < 0)
	278	goto close_fd_1;
	279	res = connect(fd[1], (struct sockaddr *)&addr, len);
	280	if (res < 0)
	281	goto close_fd_1;
	282	res = accept(fd[0], NULL, NULL);
	283	if (res < 0)
	284	goto close_fd_1;
	285	close(fd[0]);
	286	fd[0] = res;
	287	return 0;
	288
	289	close_fd_1:
	290	close(fd[1]);
	291
	292	close_fd_0:
	293	close(fd[0]);
	294
	295	err:
	296	return -1;
	297	}
	298
	299	int helper_thread_create(struct fio_sem startup_sem, struct sk_out sk_out)
	300	{
	301	struct helper_data *hd;
	302	int ret;
	303
	304	hd = scalloc(1, sizeof(*hd));
	305
	306	setup_disk_util();
	307	steadystate_setup();
	308
	309	hd->sk_out = sk_out;
	310
	311	#if defined(CONFIG_PIPE2)
	312	ret = pipe2(hd->pipe, O_CLOEXEC);
	313	#elif defined(CONFIG_PIPE)
	314	ret = pipe(hd->pipe);
	315	#else
	316	ret = pipe_over_loopback(hd->pipe);
	317	#endif
	318	if (ret)
	319	return 1;
	320
	321	ret = make_nonblocking(hd->pipe[0]);
	322	assert(ret >= 0);
	323
	324	hd->startup_sem = startup_sem;
	325
	326	DRD_IGNORE_VAR(helper_data);
	327
	328	ret = pthread_create(&hd->thread, NULL, helper_thread_main, hd);
	329	if (ret) {
	330	log_err("Can't create helper thread: %s\n", strerror(ret));
	331	return 1;
	332	}
	333
	334	helper_data = hd;
	335
	336	dprint(FD_MUTEX, "wait on startup_sem\n");
	337	fio_sem_down(startup_sem);
	338	dprint(FD_MUTEX, "done waiting on startup_sem\n");
	339	return 0;
	340	}