[fio.git] / engines / mmap.c

/*
 * regular read/write sync io engine
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <sys/mman.h>

#include "../fio.h"
#include "../os.h"

struct mmapio_data {
	struct io_u *last_io_u;
};

static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min,
				int max, struct timespec fio_unused *t)
{
	assert(max <= 1);

	/*
	 * we can only have one finished io_u for sync io, since the depth
	 * is always 1
	 */
	if (list_empty(&td->io_u_busylist))
		return 0;

	return 1;
}

static struct io_u *fio_mmapio_event(struct thread_data *td, int event)
{
	struct mmapio_data *sd = td->io_ops->data;

	assert(event == 0);

	return sd->last_io_u;
}


static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	unsigned long long real_off = io_u->offset - f->file_offset;
	struct mmapio_data *sd = td->io_ops->data;

	if (io_u->ddir == DDIR_READ)
		memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
	else if (io_u->ddir == DDIR_WRITE)
		memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
	else if (io_u->ddir == DDIR_SYNC) {
		if (msync(f->mmap, f->file_size, MS_SYNC))
			io_u->error = errno;
	}

	/*
	 * not really direct, but should drop the pages from the cache
	 */
	if (td->odirect && io_u->ddir != DDIR_SYNC) {
		if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0)
			io_u->error = errno;
		if (madvise(f->mmap + real_off, io_u->xfer_buflen,  MADV_DONTNEED) < 0)
			io_u->error = errno;
	}

	if (!io_u->error)
		sd->last_io_u = io_u;
	else
		td_verror(td, io_u->error);

	return io_u->error;
}

static void fio_mmapio_cleanup(struct thread_data *td)
{
	if (td->io_ops->data) {
		free(td->io_ops->data);
		td->io_ops->data = NULL;
	}
}

static int fio_mmapio_init(struct thread_data *td)
{
	struct mmapio_data *sd = malloc(sizeof(*sd));

	sd->last_io_u = NULL;
	td->io_ops->data = sd;
	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "mmap",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_mmapio_init,
	.queue		= fio_mmapio_queue,
	.getevents	= fio_mmapio_getevents,
	.event		= fio_mmapio_event,
	.cleanup	= fio_mmapio_cleanup,
	.flags		= FIO_SYNCIO | FIO_MMAPIO,
};

static void fio_init fio_mmapio_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_mmapio_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
2866c82d JA	1	/*
	2	* regular read/write sync io engine
	3	*
	4	*/
	5	#include <stdio.h>
	6	#include <stdlib.h>
	7	#include <unistd.h>
	8	#include <errno.h>
	9	#include <assert.h>
	10	#include <sys/mman.h>
5f350952 JA	11
	12	#include "../fio.h"
	13	#include "../os.h"
2866c82d JA	14
	15	struct mmapio_data {
	16	struct io_u *last_io_u;
	17	};
	18
	19	static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min,
	20	int max, struct timespec fio_unused *t)
	21	{
	22	assert(max <= 1);
	23
	24	/*
	25	* we can only have one finished io_u for sync io, since the depth
	26	* is always 1
	27	*/
	28	if (list_empty(&td->io_u_busylist))
	29	return 0;
	30
	31	return 1;
	32	}
	33
	34	static struct io_u fio_mmapio_event(struct thread_data td, int event)
	35	{
	36	struct mmapio_data *sd = td->io_ops->data;
	37
	38	assert(event == 0);
	39
	40	return sd->last_io_u;
	41	}
	42
	43
	44	static int fio_mmapio_queue(struct thread_data td, struct io_u io_u)
	45	{
53cdc686 JA	46	struct fio_file *f = io_u->file;
53cdc686 JA	47	unsigned long long real_off = io_u->offset - f->file_offset;
2866c82d JA	48	struct mmapio_data *sd = td->io_ops->data;
	49
	50	if (io_u->ddir == DDIR_READ)
cec6b55d	51	memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
87dc1ab1	52	else if (io_u->ddir == DDIR_WRITE)
cec6b55d	53	memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
b907a5b5 JA	54	else if (io_u->ddir == DDIR_SYNC) {
	55	if (msync(f->mmap, f->file_size, MS_SYNC))
	56	io_u->error = errno;
	57	}
2866c82d JA	58
	59	/*
	60	* not really direct, but should drop the pages from the cache
	61	*/
b907a5b5	62	if (td->odirect && io_u->ddir != DDIR_SYNC) {
cec6b55d	63	if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0)
2866c82d	64	io_u->error = errno;
cec6b55d	65	if (madvise(f->mmap + real_off, io_u->xfer_buflen, MADV_DONTNEED) < 0)
2866c82d JA	66	io_u->error = errno;
	67	}
	68
	69	if (!io_u->error)
	70	sd->last_io_u = io_u;
95bcd815 JA	71	else
95bcd815 JA	72	td_verror(td, io_u->error);
2866c82d JA	73
	74	return io_u->error;
	75	}
	76
2866c82d JA	77	static void fio_mmapio_cleanup(struct thread_data *td)
	78	{
	79	if (td->io_ops->data) {
	80	free(td->io_ops->data);
	81	td->io_ops->data = NULL;
	82	}
	83	}
	84
	85	static int fio_mmapio_init(struct thread_data *td)
	86	{
	87	struct mmapio_data sd = malloc(sizeof(sd));
	88
	89	sd->last_io_u = NULL;
	90	td->io_ops->data = sd;
	91	return 0;
	92	}
	93
5f350952	94	static struct ioengine_ops ioengine = {
2866c82d JA	95	.name = "mmap",
	96	.version = FIO_IOOPS_VERSION,
	97	.init = fio_mmapio_init,
	98	.queue = fio_mmapio_queue,
	99	.getevents = fio_mmapio_getevents,
	100	.event = fio_mmapio_event,
	101	.cleanup = fio_mmapio_cleanup,
d9257bea	102	.flags = FIO_SYNCIO \| FIO_MMAPIO,
2866c82d	103	};
5f350952 JA	104
	105	static void fio_init fio_mmapio_register(void)
	106	{
	107	register_ioengine(&ioengine);
	108	}
	109
	110	static void fio_exit fio_mmapio_unregister(void)
	111	{
	112	unregister_ioengine(&ioengine);
	113	}