[linux-block.git] / tools / io_uring / io_uring-bench.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Simple benchmark program that uses the various features of io_uring
 * to provide fast random access to a device/file. It has various
 * options that are control how we use io_uring, see the OPTIONS section
 * below. This uses the raw io_uring interface.
 *
 * Copyright (C) 2018-2019 Jens Axboe
 */
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <stdlib.h>
#include <stddef.h>
#include <signal.h>
#include <inttypes.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/uio.h>
#include <linux/fs.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <sched.h>

#include "liburing.h"
#include "barrier.h"

#define min(a, b)		((a < b) ? (a) : (b))

struct io_sq_ring {
	unsigned *head;
	unsigned *tail;
	unsigned *ring_mask;
	unsigned *ring_entries;
	unsigned *flags;
	unsigned *array;
};

struct io_cq_ring {
	unsigned *head;
	unsigned *tail;
	unsigned *ring_mask;
	unsigned *ring_entries;
	struct io_uring_cqe *cqes;
};

#define DEPTH			128

#define BATCH_SUBMIT		32
#define BATCH_COMPLETE		32

#define BS			4096

#define MAX_FDS			16

static unsigned sq_ring_mask, cq_ring_mask;

struct file {
	unsigned long max_blocks;
	unsigned pending_ios;
	int real_fd;
	int fixed_fd;
};

struct submitter {
	pthread_t thread;
	int ring_fd;
	struct drand48_data rand;
	struct io_sq_ring sq_ring;
	struct io_uring_sqe *sqes;
	struct iovec iovecs[DEPTH];
	struct io_cq_ring cq_ring;
	int inflight;
	unsigned long reaps;
	unsigned long done;
	unsigned long calls;
	volatile int finish;

	__s32 *fds;

	struct file files[MAX_FDS];
	unsigned nr_files;
	unsigned cur_file;
};

static struct submitter submitters[1];
static volatile int finish;

/*
 * OPTIONS: Set these to test the various features of io_uring.
 */
static int polled = 1;		/* use IO polling */
static int fixedbufs = 1;	/* use fixed user buffers */
static int register_files = 1;	/* use fixed files */
static int buffered = 0;	/* use buffered IO, not O_DIRECT */
static int sq_thread_poll = 0;	/* use kernel submission/poller thread */
static int sq_thread_cpu = -1;	/* pin above thread to this CPU */
static int do_nop = 0;		/* no-op SQ ring commands */

static int io_uring_register_buffers(struct submitter *s)
{
	if (do_nop)
		return 0;

	return io_uring_register(s->ring_fd, IORING_REGISTER_BUFFERS, s->iovecs,
					DEPTH);
}

static int io_uring_register_files(struct submitter *s)
{
	unsigned i;

	if (do_nop)
		return 0;

	s->fds = calloc(s->nr_files, sizeof(__s32));
	for (i = 0; i < s->nr_files; i++) {
		s->fds[i] = s->files[i].real_fd;
		s->files[i].fixed_fd = i;
	}

	return io_uring_register(s->ring_fd, IORING_REGISTER_FILES, s->fds,
					s->nr_files);
}

static int gettid(void)
{
	return syscall(__NR_gettid);
}

static unsigned file_depth(struct submitter *s)
{
	return (DEPTH + s->nr_files - 1) / s->nr_files;
}

static void init_io(struct submitter *s, unsigned index)
{
	struct io_uring_sqe *sqe = &s->sqes[index];
	unsigned long offset;
	struct file *f;
	long r;

	if (do_nop) {
		sqe->opcode = IORING_OP_NOP;
		return;
	}

	if (s->nr_files == 1) {
		f = &s->files[0];
	} else {
		f = &s->files[s->cur_file];
		if (f->pending_ios >= file_depth(s)) {
			s->cur_file++;
			if (s->cur_file == s->nr_files)
				s->cur_file = 0;
			f = &s->files[s->cur_file];
		}
	}
	f->pending_ios++;

	lrand48_r(&s->rand, &r);
	offset = (r % (f->max_blocks - 1)) * BS;

	if (register_files) {
		sqe->flags = IOSQE_FIXED_FILE;
		sqe->fd = f->fixed_fd;
	} else {
		sqe->flags = 0;
		sqe->fd = f->real_fd;
	}
	if (fixedbufs) {
		sqe->opcode = IORING_OP_READ_FIXED;
		sqe->addr = (unsigned long) s->iovecs[index].iov_base;
		sqe->len = BS;
		sqe->buf_index = index;
	} else {
		sqe->opcode = IORING_OP_READV;
		sqe->addr = (unsigned long) &s->iovecs[index];
		sqe->len = 1;
		sqe->buf_index = 0;
	}
	sqe->ioprio = 0;
	sqe->off = offset;
	sqe->user_data = (unsigned long) f;
}

static int prep_more_ios(struct submitter *s, unsigned max_ios)
{
	struct io_sq_ring *ring = &s->sq_ring;
	unsigned index, tail, next_tail, prepped = 0;

	next_tail = tail = *ring->tail;
	do {
		next_tail++;
		read_barrier();
		if (next_tail == *ring->head)
			break;

		index = tail & sq_ring_mask;
		init_io(s, index);
		ring->array[index] = index;
		prepped++;
		tail = next_tail;
	} while (prepped < max_ios);

	if (*ring->tail != tail) {
		/* order tail store with writes to sqes above */
		write_barrier();
		*ring->tail = tail;
		write_barrier();
	}
	return prepped;
}

static int get_file_size(struct file *f)
{
	struct stat st;

	if (fstat(f->real_fd, &st) < 0)
		return -1;
	if (S_ISBLK(st.st_mode)) {
		unsigned long long bytes;

		if (ioctl(f->real_fd, BLKGETSIZE64, &bytes) != 0)
			return -1;

		f->max_blocks = bytes / BS;
		return 0;
	} else if (S_ISREG(st.st_mode)) {
		f->max_blocks = st.st_size / BS;
		return 0;
	}

	return -1;
}

static int reap_events(struct submitter *s)
{
	struct io_cq_ring *ring = &s->cq_ring;
	struct io_uring_cqe *cqe;
	unsigned head, reaped = 0;

	head = *ring->head;
	do {
		struct file *f;

		read_barrier();
		if (head == *ring->tail)
			break;
		cqe = &ring->cqes[head & cq_ring_mask];
		if (!do_nop) {
			f = (struct file *) (uintptr_t) cqe->user_data;
			f->pending_ios--;
			if (cqe->res != BS) {
				printf("io: unexpected ret=%d\n", cqe->res);
				if (polled && cqe->res == -EOPNOTSUPP)
					printf("Your filesystem doesn't support poll\n");
				return -1;
			}
		}
		reaped++;
		head++;
	} while (1);

	s->inflight -= reaped;
	*ring->head = head;
	write_barrier();
	return reaped;
}

static void *submitter_fn(void *data)
{
	struct submitter *s = data;
	struct io_sq_ring *ring = &s->sq_ring;
	int ret, prepped;

	printf("submitter=%d\n", gettid());

	srand48_r(pthread_self(), &s->rand);

	prepped = 0;
	do {
		int to_wait, to_submit, this_reap, to_prep;

		if (!prepped && s->inflight < DEPTH) {
			to_prep = min(DEPTH - s->inflight, BATCH_SUBMIT);
			prepped = prep_more_ios(s, to_prep);
		}
		s->inflight += prepped;
submit_more:
		to_submit = prepped;
submit:
		if (to_submit && (s->inflight + to_submit <= DEPTH))
			to_wait = 0;
		else
			to_wait = min(s->inflight + to_submit, BATCH_COMPLETE);

		/*
		 * Only need to call io_uring_enter if we're not using SQ thread
		 * poll, or if IORING_SQ_NEED_WAKEUP is set.
		 */
		if (!sq_thread_poll || (*ring->flags & IORING_SQ_NEED_WAKEUP)) {
			unsigned flags = 0;

			if (to_wait)
				flags = IORING_ENTER_GETEVENTS;
			if ((*ring->flags & IORING_SQ_NEED_WAKEUP))
				flags |= IORING_ENTER_SQ_WAKEUP;
			ret = io_uring_enter(s->ring_fd, to_submit, to_wait,
						flags, NULL);
			s->calls++;
		}

		/*
		 * For non SQ thread poll, we already got the events we needed
		 * through the io_uring_enter() above. For SQ thread poll, we
		 * need to loop here until we find enough events.
		 */
		this_reap = 0;
		do {
			int r;
			r = reap_events(s);
			if (r == -1) {
				s->finish = 1;
				break;
			} else if (r > 0)
				this_reap += r;
		} while (sq_thread_poll && this_reap < to_wait);
		s->reaps += this_reap;

		if (ret >= 0) {
			if (!ret) {
				to_submit = 0;
				if (s->inflight)
					goto submit;
				continue;
			} else if (ret < to_submit) {
				int diff = to_submit - ret;

				s->done += ret;
				prepped -= diff;
				goto submit_more;
			}
			s->done += ret;
			prepped = 0;
			continue;
		} else if (ret < 0) {
			if (errno == EAGAIN) {
				if (s->finish)
					break;
				if (this_reap)
					goto submit;
				to_submit = 0;
				goto submit;
			}
			printf("io_submit: %s\n", strerror(errno));
			break;
		}
	} while (!s->finish);

	finish = 1;
	return NULL;
}

static void sig_int(int sig)
{
	printf("Exiting on signal %d\n", sig);
	submitters[0].finish = 1;
	finish = 1;
}

static void arm_sig_int(void)
{
	struct sigaction act;

	memset(&act, 0, sizeof(act));
	act.sa_handler = sig_int;
	act.sa_flags = SA_RESTART;
	sigaction(SIGINT, &act, NULL);
}

static int setup_ring(struct submitter *s)
{
	struct io_sq_ring *sring = &s->sq_ring;
	struct io_cq_ring *cring = &s->cq_ring;
	struct io_uring_params p;
	int ret, fd;
	void *ptr;

	memset(&p, 0, sizeof(p));

	if (polled && !do_nop)
		p.flags |= IORING_SETUP_IOPOLL;
	if (sq_thread_poll) {
		p.flags |= IORING_SETUP_SQPOLL;
		if (sq_thread_cpu != -1) {
			p.flags |= IORING_SETUP_SQ_AFF;
			p.sq_thread_cpu = sq_thread_cpu;
		}
	}

	fd = io_uring_setup(DEPTH, &p);
	if (fd < 0) {
		perror("io_uring_setup");
		return 1;
	}
	s->ring_fd = fd;

	if (fixedbufs) {
		ret = io_uring_register_buffers(s);
		if (ret < 0) {
			perror("io_uring_register_buffers");
			return 1;
		}
	}

	if (register_files) {
		ret = io_uring_register_files(s);
		if (ret < 0) {
			perror("io_uring_register_files");
			return 1;
		}
	}

	ptr = mmap(0, p.sq_off.array + p.sq_entries * sizeof(__u32),
			PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
			IORING_OFF_SQ_RING);
	printf("sq_ring ptr = 0x%p\n", ptr);
	sring->head = ptr + p.sq_off.head;
	sring->tail = ptr + p.sq_off.tail;
	sring->ring_mask = ptr + p.sq_off.ring_mask;
	sring->ring_entries = ptr + p.sq_off.ring_entries;
	sring->flags = ptr + p.sq_off.flags;
	sring->array = ptr + p.sq_off.array;
	sq_ring_mask = *sring->ring_mask;

	s->sqes = mmap(0, p.sq_entries * sizeof(struct io_uring_sqe),
			PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
			IORING_OFF_SQES);
	printf("sqes ptr    = 0x%p\n", s->sqes);

	ptr = mmap(0, p.cq_off.cqes + p.cq_entries * sizeof(struct io_uring_cqe),
			PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
			IORING_OFF_CQ_RING);
	printf("cq_ring ptr = 0x%p\n", ptr);
	cring->head = ptr + p.cq_off.head;
	cring->tail = ptr + p.cq_off.tail;
	cring->ring_mask = ptr + p.cq_off.ring_mask;
	cring->ring_entries = ptr + p.cq_off.ring_entries;
	cring->cqes = ptr + p.cq_off.cqes;
	cq_ring_mask = *cring->ring_mask;
	return 0;
}

static void file_depths(char *buf)
{
	struct submitter *s = &submitters[0];
	unsigned i;
	char *p;

	buf[0] = '\0';
	p = buf;
	for (i = 0; i < s->nr_files; i++) {
		struct file *f = &s->files[i];

		if (i + 1 == s->nr_files)
			p += sprintf(p, "%d", f->pending_ios);
		else
			p += sprintf(p, "%d, ", f->pending_ios);
	}
}

int main(int argc, char *argv[])
{
	struct submitter *s = &submitters[0];
	unsigned long done, calls, reap;
	int err, i, flags, fd;
	char *fdepths;
	void *ret;

	if (!do_nop && argc < 2) {
		printf("%s: filename\n", argv[0]);
		return 1;
	}

	flags = O_RDONLY | O_NOATIME;
	if (!buffered)
		flags |= O_DIRECT;

	i = 1;
	while (!do_nop && i < argc) {
		struct file *f;

		if (s->nr_files == MAX_FDS) {
			printf("Max number of files (%d) reached\n", MAX_FDS);
			break;
		}
		fd = open(argv[i], flags);
		if (fd < 0) {
			perror("open");
			return 1;
		}

		f = &s->files[s->nr_files];
		f->real_fd = fd;
		if (get_file_size(f)) {
			printf("failed getting size of device/file\n");
			return 1;
		}
		if (f->max_blocks <= 1) {
			printf("Zero file/device size?\n");
			return 1;
		}
		f->max_blocks--;

		printf("Added file %s\n", argv[i]);
		s->nr_files++;
		i++;
	}

	if (fixedbufs) {
		struct rlimit rlim;

		rlim.rlim_cur = RLIM_INFINITY;
		rlim.rlim_max = RLIM_INFINITY;
		if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
			perror("setrlimit");
			return 1;
		}
	}

	arm_sig_int();

	for (i = 0; i < DEPTH; i++) {
		void *buf;

		if (posix_memalign(&buf, BS, BS)) {
			printf("failed alloc\n");
			return 1;
		}
		s->iovecs[i].iov_base = buf;
		s->iovecs[i].iov_len = BS;
	}

	err = setup_ring(s);
	if (err) {
		printf("ring setup failed: %s, %d\n", strerror(errno), err);
		return 1;
	}
	printf("polled=%d, fixedbufs=%d, buffered=%d", polled, fixedbufs, buffered);
	printf(" QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, *s->sq_ring.ring_entries, *s->cq_ring.ring_entries);

	pthread_create(&s->thread, NULL, submitter_fn, s);

	fdepths = malloc(8 * s->nr_files);
	reap = calls = done = 0;
	do {
		unsigned long this_done = 0;
		unsigned long this_reap = 0;
		unsigned long this_call = 0;
		unsigned long rpc = 0, ipc = 0;

		sleep(1);
		this_done += s->done;
		this_call += s->calls;
		this_reap += s->reaps;
		if (this_call - calls) {
			rpc = (this_done - done) / (this_call - calls);
			ipc = (this_reap - reap) / (this_call - calls);
		} else
			rpc = ipc = -1;
		file_depths(fdepths);
		printf("IOPS=%lu, IOS/call=%ld/%ld, inflight=%u (%s)\n",
				this_done - done, rpc, ipc, s->inflight,
				fdepths);
		done = this_done;
		calls = this_call;
		reap = this_reap;
	} while (!finish);

	pthread_join(s->thread, &ret);
	close(s->ring_fd);
	free(fdepths);
	return 0;
}
Commit	Line	Data
21b4aa5d JA	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Simple benchmark program that uses the various features of io_uring
	4	* to provide fast random access to a device/file. It has various
	5	* options that are control how we use io_uring, see the OPTIONS section
	6	* below. This uses the raw io_uring interface.
	7	*
	8	* Copyright (C) 2018-2019 Jens Axboe
	9	*/
	10	#include <stdio.h>
	11	#include <errno.h>
	12	#include <assert.h>
	13	#include <stdlib.h>
	14	#include <stddef.h>
	15	#include <signal.h>
	16	#include <inttypes.h>
	17
	18	#include <sys/types.h>
	19	#include <sys/stat.h>
	20	#include <sys/ioctl.h>
	21	#include <sys/syscall.h>
	22	#include <sys/resource.h>
	23	#include <sys/mman.h>
	24	#include <sys/uio.h>
	25	#include <linux/fs.h>
	26	#include <fcntl.h>
	27	#include <unistd.h>
	28	#include <string.h>
	29	#include <pthread.h>
	30	#include <sched.h>
	31
	32	#include "liburing.h"
	33	#include "barrier.h"
	34
21b4aa5d JA	35	#define min(a, b) ((a < b) ? (a) : (b))
	36
	37	struct io_sq_ring {
	38	unsigned *head;
	39	unsigned *tail;
	40	unsigned *ring_mask;
	41	unsigned *ring_entries;
	42	unsigned *flags;
	43	unsigned *array;
	44	};
	45
	46	struct io_cq_ring {
	47	unsigned *head;
	48	unsigned *tail;
	49	unsigned *ring_mask;
	50	unsigned *ring_entries;
	51	struct io_uring_cqe *cqes;
	52	};
	53
	54	#define DEPTH 128
	55
	56	#define BATCH_SUBMIT 32
	57	#define BATCH_COMPLETE 32
	58
	59	#define BS 4096
	60
	61	#define MAX_FDS 16
	62
	63	static unsigned sq_ring_mask, cq_ring_mask;
	64
	65	struct file {
	66	unsigned long max_blocks;
	67	unsigned pending_ios;
	68	int real_fd;
	69	int fixed_fd;
	70	};
	71
	72	struct submitter {
	73	pthread_t thread;
	74	int ring_fd;
	75	struct drand48_data rand;
	76	struct io_sq_ring sq_ring;
	77	struct io_uring_sqe *sqes;
	78	struct iovec iovecs[DEPTH];
	79	struct io_cq_ring cq_ring;
	80	int inflight;
	81	unsigned long reaps;
	82	unsigned long done;
	83	unsigned long calls;
21b4aa5d JA	84	volatile int finish;
	85
	86	__s32 *fds;
	87
	88	struct file files[MAX_FDS];
	89	unsigned nr_files;
	90	unsigned cur_file;
	91	};
	92
	93	static struct submitter submitters[1];
	94	static volatile int finish;
	95
	96	/*
	97	* OPTIONS: Set these to test the various features of io_uring.
	98	*/
	99	static int polled = 1; /* use IO polling */
	100	static int fixedbufs = 1; /* use fixed user buffers */
	101	static int register_files = 1; /* use fixed files */
	102	static int buffered = 0; /* use buffered IO, not O_DIRECT */
	103	static int sq_thread_poll = 0; /* use kernel submission/poller thread */
	104	static int sq_thread_cpu = -1; /* pin above thread to this CPU */
	105	static int do_nop = 0; /* no-op SQ ring commands */
	106
	107	static int io_uring_register_buffers(struct submitter *s)
	108	{
	109	if (do_nop)
	110	return 0;
	111
	112	return io_uring_register(s->ring_fd, IORING_REGISTER_BUFFERS, s->iovecs,
	113	DEPTH);
	114	}
	115
	116	static int io_uring_register_files(struct submitter *s)
	117	{
	118	unsigned i;
	119
	120	if (do_nop)
	121	return 0;
	122
	123	s->fds = calloc(s->nr_files, sizeof(__s32));
	124	for (i = 0; i < s->nr_files; i++) {
	125	s->fds[i] = s->files[i].real_fd;
	126	s->files[i].fixed_fd = i;
	127	}
	128
	129	return io_uring_register(s->ring_fd, IORING_REGISTER_FILES, s->fds,
	130	s->nr_files);
	131	}
	132
	133	static int gettid(void)
	134	{
	135	return syscall(__NR_gettid);
	136	}
	137
	138	static unsigned file_depth(struct submitter *s)
	139	{
	140	return (DEPTH + s->nr_files - 1) / s->nr_files;
	141	}
	142
	143	static void init_io(struct submitter *s, unsigned index)
	144	{
	145	struct io_uring_sqe *sqe = &s->sqes[index];
	146	unsigned long offset;
	147	struct file *f;
148	long r;
149
150	if (do_nop) {
151	sqe->opcode = IORING_OP_NOP;
152	return;
153	}
154
155	if (s->nr_files == 1) {
156	f = &s->files[0];
157	} else {
158	f = &s->files[s->cur_file];
159	if (f->pending_ios >= file_depth(s)) {
160	s->cur_file++;
161	if (s->cur_file == s->nr_files)
162	s->cur_file = 0;
163	f = &s->files[s->cur_file];
164	}
165	}
166	f->pending_ios++;
167
168	lrand48_r(&s->rand, &r);
169	offset = (r % (f->max_blocks - 1)) * BS;
170
171	if (register_files) {
172	sqe->flags = IOSQE_FIXED_FILE;
173	sqe->fd = f->fixed_fd;
174	} else {
175	sqe->flags = 0;
176	sqe->fd = f->real_fd;
177	}
178	if (fixedbufs) {
179	sqe->opcode = IORING_OP_READ_FIXED;
180	sqe->addr = (unsigned long) s->iovecs[index].iov_base;
181	sqe->len = BS;
182	sqe->buf_index = index;
183	} else {
184	sqe->opcode = IORING_OP_READV;
185	sqe->addr = (unsigned long) &s->iovecs[index];
186	sqe->len = 1;
187	sqe->buf_index = 0;
188	}
189	sqe->ioprio = 0;
190	sqe->off = offset;
191	sqe->user_data = (unsigned long) f;
192	}
193
194	static int prep_more_ios(struct submitter *s, unsigned max_ios)
195	{
196	struct io_sq_ring *ring = &s->sq_ring;
197	unsigned index, tail, next_tail, prepped = 0;
198
199	next_tail = tail = *ring->tail;
200	do {
201	next_tail++;
202	read_barrier();
203	if (next_tail == *ring->head)
204	break;
205
206	index = tail & sq_ring_mask;
207	init_io(s, index);
208	ring->array[index] = index;
209	prepped++;
210	tail = next_tail;
211	} while (prepped < max_ios);
212
213	if (*ring->tail != tail) {
214	/* order tail store with writes to sqes above */
215	write_barrier();
216	*ring->tail = tail;
217	write_barrier();
218	}
219	return prepped;
220	}
221
222	static int get_file_size(struct file *f)
223	{
224	struct stat st;
225
226	if (fstat(f->real_fd, &st) < 0)
227	return -1;
228	if (S_ISBLK(st.st_mode)) {
229	unsigned long long bytes;
230
231	if (ioctl(f->real_fd, BLKGETSIZE64, &bytes) != 0)
232	return -1;
233
234	f->max_blocks = bytes / BS;
235	return 0;
236	} else if (S_ISREG(st.st_mode)) {
237	f->max_blocks = st.st_size / BS;
238	return 0;
239	}
240
241	return -1;
242	}
243
244	static int reap_events(struct submitter *s)
245	{
246	struct io_cq_ring *ring = &s->cq_ring;
247	struct io_uring_cqe *cqe;
248	unsigned head, reaped = 0;
249
250	head = *ring->head;
251	do {
252	struct file *f;
253
254	read_barrier();
255	if (head == *ring->tail)
256	break;
257	cqe = &ring->cqes[head & cq_ring_mask];
258	if (!do_nop) {
259	f = (struct file *) (uintptr_t) cqe->user_data;
260	f->pending_ios--;
261	if (cqe->res != BS) {
262	printf("io: unexpected ret=%d\n", cqe->res);
263	if (polled && cqe->res == -EOPNOTSUPP)
264	printf("Your filesystem doesn't support poll\n");
265	return -1;
266	}
267	}
21b4aa5d JA	268	reaped++;
	269	head++;
	270	} while (1);
	271
	272	s->inflight -= reaped;
	273	*ring->head = head;
	274	write_barrier();
	275	return reaped;
	276	}
	277
	278	static void submitter_fn(void data)
	279	{
	280	struct submitter *s = data;
	281	struct io_sq_ring *ring = &s->sq_ring;
	282	int ret, prepped;
	283
	284	printf("submitter=%d\n", gettid());
	285
	286	srand48_r(pthread_self(), &s->rand);
	287
	288	prepped = 0;
	289	do {
	290	int to_wait, to_submit, this_reap, to_prep;
	291
	292	if (!prepped && s->inflight < DEPTH) {
	293	to_prep = min(DEPTH - s->inflight, BATCH_SUBMIT);
	294	prepped = prep_more_ios(s, to_prep);
	295	}
	296	s->inflight += prepped;
	297	submit_more:
	298	to_submit = prepped;
	299	submit:
	300	if (to_submit && (s->inflight + to_submit <= DEPTH))
	301	to_wait = 0;
	302	else
	303	to_wait = min(s->inflight + to_submit, BATCH_COMPLETE);
	304
	305	/*
	306	* Only need to call io_uring_enter if we're not using SQ thread
	307	* poll, or if IORING_SQ_NEED_WAKEUP is set.
	308	*/
	309	if (!sq_thread_poll \|\| (*ring->flags & IORING_SQ_NEED_WAKEUP)) {
	310	unsigned flags = 0;
	311
	312	if (to_wait)
	313	flags = IORING_ENTER_GETEVENTS;
	314	if ((*ring->flags & IORING_SQ_NEED_WAKEUP))
	315	flags \|= IORING_ENTER_SQ_WAKEUP;
	316	ret = io_uring_enter(s->ring_fd, to_submit, to_wait,
	317	flags, NULL);
	318	s->calls++;
	319	}
	320
	321	/*
	322	* For non SQ thread poll, we already got the events we needed
	323	* through the io_uring_enter() above. For SQ thread poll, we
	324	* need to loop here until we find enough events.
	325	*/
	326	this_reap = 0;
	327	do {
	328	int r;
	329	r = reap_events(s);
	330	if (r == -1) {
	331	s->finish = 1;
332	break;
333	} else if (r > 0)
334	this_reap += r;
335	} while (sq_thread_poll && this_reap < to_wait);
336	s->reaps += this_reap;
337
338	if (ret >= 0) {
339	if (!ret) {
340	to_submit = 0;
341	if (s->inflight)
342	goto submit;
343	continue;
344	} else if (ret < to_submit) {
345	int diff = to_submit - ret;
346
347	s->done += ret;
348	prepped -= diff;
349	goto submit_more;
350	}
351	s->done += ret;
352	prepped = 0;
353	continue;
354	} else if (ret < 0) {
355	if (errno == EAGAIN) {
356	if (s->finish)
357	break;
358	if (this_reap)
359	goto submit;
360	to_submit = 0;
361	goto submit;
362	}
363	printf("io_submit: %s\n", strerror(errno));
364	break;
365	}
366	} while (!s->finish);
367
368	finish = 1;
369	return NULL;
370	}
371
372	static void sig_int(int sig)
373	{
374	printf("Exiting on signal %d\n", sig);
375	submitters[0].finish = 1;
376	finish = 1;
377	}
378
379	static void arm_sig_int(void)
380	{
381	struct sigaction act;
382
383	memset(&act, 0, sizeof(act));
384	act.sa_handler = sig_int;
385	act.sa_flags = SA_RESTART;
386	sigaction(SIGINT, &act, NULL);
387	}
388
389	static int setup_ring(struct submitter *s)
390	{
391	struct io_sq_ring *sring = &s->sq_ring;
392	struct io_cq_ring *cring = &s->cq_ring;
393	struct io_uring_params p;
394	int ret, fd;
395	void *ptr;
396
397	memset(&p, 0, sizeof(p));
398
399	if (polled && !do_nop)
400	p.flags \|= IORING_SETUP_IOPOLL;
401	if (sq_thread_poll) {
402	p.flags \|= IORING_SETUP_SQPOLL;
403	if (sq_thread_cpu != -1) {
404	p.flags \|= IORING_SETUP_SQ_AFF;
405	p.sq_thread_cpu = sq_thread_cpu;
406	}
407	}
408
409	fd = io_uring_setup(DEPTH, &p);
410	if (fd < 0) {
411	perror("io_uring_setup");
412	return 1;
413	}
414	s->ring_fd = fd;
415
416	if (fixedbufs) {
417	ret = io_uring_register_buffers(s);
418	if (ret < 0) {
419	perror("io_uring_register_buffers");
420	return 1;
421	}
422	}
423
424	if (register_files) {
425	ret = io_uring_register_files(s);
426	if (ret < 0) {
427	perror("io_uring_register_files");
428	return 1;
429	}
430	}
431
432	ptr = mmap(0, p.sq_off.array + p.sq_entries * sizeof(__u32),
433	PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd,
434	IORING_OFF_SQ_RING);
435	printf("sq_ring ptr = 0x%p\n", ptr);
436	sring->head = ptr + p.sq_off.head;
437	sring->tail = ptr + p.sq_off.tail;
438	sring->ring_mask = ptr + p.sq_off.ring_mask;
439	sring->ring_entries = ptr + p.sq_off.ring_entries;
440	sring->flags = ptr + p.sq_off.flags;
441	sring->array = ptr + p.sq_off.array;
442	sq_ring_mask = *sring->ring_mask;
443
444	s->sqes = mmap(0, p.sq_entries * sizeof(struct io_uring_sqe),
445	PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd,
446	IORING_OFF_SQES);
447	printf("sqes ptr = 0x%p\n", s->sqes);
448
449	ptr = mmap(0, p.cq_off.cqes + p.cq_entries * sizeof(struct io_uring_cqe),
450	PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd,
451	IORING_OFF_CQ_RING);
452	printf("cq_ring ptr = 0x%p\n", ptr);
453	cring->head = ptr + p.cq_off.head;
454	cring->tail = ptr + p.cq_off.tail;
455	cring->ring_mask = ptr + p.cq_off.ring_mask;
456	cring->ring_entries = ptr + p.cq_off.ring_entries;
457	cring->cqes = ptr + p.cq_off.cqes;
458	cq_ring_mask = *cring->ring_mask;
459	return 0;
460	}
461
462	static void file_depths(char *buf)
463	{
464	struct submitter *s = &submitters[0];
465	unsigned i;
466	char *p;
467
468	buf[0] = '\0';
469	p = buf;
470	for (i = 0; i < s->nr_files; i++) {
471	struct file *f = &s->files[i];
472
473	if (i + 1 == s->nr_files)
474	p += sprintf(p, "%d", f->pending_ios);
475	else
476	p += sprintf(p, "%d, ", f->pending_ios);
477	}
478	}
479
480	int main(int argc, char *argv[])
481	{
482	struct submitter *s = &submitters[0];
70423667	483	unsigned long done, calls, reap;
21b4aa5d JA	484	int err, i, flags, fd;
	485	char *fdepths;
	486	void *ret;
	487
	488	if (!do_nop && argc < 2) {
	489	printf("%s: filename\n", argv[0]);
	490	return 1;
	491	}
	492
	493	flags = O_RDONLY \| O_NOATIME;
	494	if (!buffered)
	495	flags \|= O_DIRECT;
	496
	497	i = 1;
	498	while (!do_nop && i < argc) {
	499	struct file *f;
	500
	501	if (s->nr_files == MAX_FDS) {
	502	printf("Max number of files (%d) reached\n", MAX_FDS);
	503	break;
	504	}
	505	fd = open(argv[i], flags);
	506	if (fd < 0) {
	507	perror("open");
	508	return 1;
	509	}
	510
	511	f = &s->files[s->nr_files];
	512	f->real_fd = fd;
	513	if (get_file_size(f)) {
	514	printf("failed getting size of device/file\n");
	515	return 1;
	516	}
	517	if (f->max_blocks <= 1) {
	518	printf("Zero file/device size?\n");
	519	return 1;
	520	}
	521	f->max_blocks--;
	522
	523	printf("Added file %s\n", argv[i]);
	524	s->nr_files++;
	525	i++;
	526	}
	527
	528	if (fixedbufs) {
	529	struct rlimit rlim;
	530
	531	rlim.rlim_cur = RLIM_INFINITY;
	532	rlim.rlim_max = RLIM_INFINITY;
	533	if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
	534	perror("setrlimit");
	535	return 1;
	536	}
	537	}
	538
	539	arm_sig_int();
	540
	541	for (i = 0; i < DEPTH; i++) {
	542	void *buf;
	543
	544	if (posix_memalign(&buf, BS, BS)) {
	545	printf("failed alloc\n");
	546	return 1;
	547	}
548	s->iovecs[i].iov_base = buf;
549	s->iovecs[i].iov_len = BS;
550	}
551
552	err = setup_ring(s);
553	if (err) {
554	printf("ring setup failed: %s, %d\n", strerror(errno), err);
555	return 1;
556	}
557	printf("polled=%d, fixedbufs=%d, buffered=%d", polled, fixedbufs, buffered);
558	printf(" QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, s->sq_ring.ring_entries, s->cq_ring.ring_entries);
559
560	pthread_create(&s->thread, NULL, submitter_fn, s);
561
562	fdepths = malloc(8 * s->nr_files);
70423667	563	reap = calls = done = 0;
21b4aa5d JA	564	do {
	565	unsigned long this_done = 0;
	566	unsigned long this_reap = 0;
	567	unsigned long this_call = 0;
21b4aa5d	568	unsigned long rpc = 0, ipc = 0;
21b4aa5d JA	569
	570	sleep(1);
	571	this_done += s->done;
	572	this_call += s->calls;
	573	this_reap += s->reaps;
21b4aa5d JA	574	if (this_call - calls) {
	575	rpc = (this_done - done) / (this_call - calls);
	576	ipc = (this_reap - reap) / (this_call - calls);
	577	} else
	578	rpc = ipc = -1;
	579	file_depths(fdepths);
70423667	580	printf("IOPS=%lu, IOS/call=%ld/%ld, inflight=%u (%s)\n",
21b4aa5d	581	this_done - done, rpc, ipc, s->inflight,
70423667	582	fdepths);
21b4aa5d JA	583	done = this_done;
	584	calls = this_call;
	585	reap = this_reap;
21b4aa5d JA	586	} while (!finish);
	587
	588	pthread_join(s->thread, &ret);
	589	close(s->ring_fd);
	590	free(fdepths);
	591	return 0;
	592	}