X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Flibaio.c;h=9cc910d73bc19fdbb690baa5295131fc0f7addbc;hp=da43f18ce1571b7c729ceb35fce02ec1aae00e12;hb=954cd73a9a93102c24afa869fbe67ac38af6e416;hpb=f8fe35e8c9e88dd681ea151251d75f6116a958b4

diff --git a/engines/libaio.c b/engines/libaio.c
index da43f18c..9cc910d7 100644
--- a/engines/libaio.c
+++ b/engines/libaio.c
@@ -1,5 +1,7 @@
 /*
- * native linux aio io engine
+ * libaio engine
+ *
+ * IO engine using the Linux native aio interface.
  *
  */
 #include <stdio.h>
@@ -7,17 +9,36 @@
 #include <unistd.h>
 #include <errno.h>
 #include <assert.h>
+#include <libaio.h>
 
 #include "../fio.h"
-#include "../os.h"
-
-#ifdef FIO_HAVE_LIBAIO
-
-#define ev_to_iou(ev)	(struct io_u *) ((unsigned long) (ev)->obj)
 
 struct libaio_data {
 	io_context_t aio_ctx;
 	struct io_event *aio_events;
+	struct iocb **iocbs;
+	struct io_u **io_us;
+	int iocbs_nr;
+};
+
+struct libaio_options {
+	struct thread_data *td;
+	unsigned int userspace_reap;
+};
+
+static struct fio_option options[] = {
+	{
+		.name	= "userspace_reap",
+		.lname	= "Libaio userspace reaping",
+		.type	= FIO_OPT_STR_SET,
+		.off1	= offsetof(struct libaio_options, userspace_reap),
+		.help	= "Use alternative user-space reap implementation",
+		.category = FIO_OPT_C_ENGINE,
+		.group	= FIO_OPT_G_LIBAIO,
+	},
+	{
+		.name	= NULL,
+	},
 };
 
 static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
@@ -25,13 +46,11 @@ static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
 	struct fio_file *f = io_u->file;
 
 	if (io_u->ddir == DDIR_READ)
-		io_prep_pread(&io_u->iocb, f->fd, io_u->buf, io_u->buflen, io_u->offset);
+		io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
 	else if (io_u->ddir == DDIR_WRITE)
-		io_prep_pwrite(&io_u->iocb, f->fd, io_u->buf, io_u->buflen, io_u->offset);
-	else if (io_u->ddir == DDIR_SYNC)
+		io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
+	else if (ddir_sync(io_u->ddir))
 		io_prep_fsync(&io_u->iocb, f->fd);
-	else
-		return 1;
 
 	return 0;
 }
@@ -39,60 +58,178 @@ static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
 static struct io_u *fio_libaio_event(struct thread_data *td, int event)
 {
 	struct libaio_data *ld = td->io_ops->data;
+	struct io_event *ev;
+	struct io_u *io_u;
+
+	ev = ld->aio_events + event;
+	io_u = container_of(ev->obj, struct io_u, iocb);
 
-	return ev_to_iou(ld->aio_events + event);
+	if (ev->res != io_u->xfer_buflen) {
+		if (ev->res > io_u->xfer_buflen)
+			io_u->error = -ev->res;
+		else
+			io_u->resid = io_u->xfer_buflen - ev->res;
+	} else
+		io_u->error = 0;
+
+	return io_u;
 }
 
-static int fio_libaio_getevents(struct thread_data *td, int min, int max,
-				struct timespec *t)
+struct aio_ring {
+	unsigned id;		 /** kernel internal index number */
+	unsigned nr;		 /** number of io_events */
+	unsigned head;
+	unsigned tail;
+
+	unsigned magic;
+	unsigned compat_features;
+	unsigned incompat_features;
+	unsigned header_length;	/** size of aio_ring */
+
+	struct io_event events[0];
+};
+
+#define AIO_RING_MAGIC	0xa10a10a1
+
+static int user_io_getevents(io_context_t aio_ctx, unsigned int max,
+			     struct io_event *events)
+{
+	long i = 0;
+	unsigned head;
+	struct aio_ring *ring = (struct aio_ring*) aio_ctx;
+
+	while (i < max) {
+		head = ring->head;
+
+		if (head == ring->tail) {
+			/* There are no more completions */
+			break;
+		} else {
+			/* There is another completion to reap */
+			events[i] = ring->events[head];
+			read_barrier();
+			ring->head = (head + 1) % ring->nr;
+			i++;
+		}
+	}
+
+	return i;
+}
+
+static int fio_libaio_getevents(struct thread_data *td, unsigned int min,
+				unsigned int max, struct timespec *t)
 {
 	struct libaio_data *ld = td->io_ops->data;
-	long r;
+	struct libaio_options *o = td->eo;
+	unsigned actual_min = td->o.iodepth_batch_complete == 0 ? 0 : min;
+	int r, events = 0;
 
 	do {
-		r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
-		if (r >= min)
-			break;
-		else if (r == -EAGAIN) {
+		if (o->userspace_reap == 1
+		    && actual_min == 0
+		    && ((struct aio_ring *)(ld->aio_ctx))->magic
+				== AIO_RING_MAGIC) {
+			r = user_io_getevents(ld->aio_ctx, max,
+				ld->aio_events + events);
+		} else {
+			r = io_getevents(ld->aio_ctx, actual_min,
+				max, ld->aio_events + events, t);
+		}
+		if (r >= 0)
+			events += r;
+		else if (r == -EAGAIN)
 			usleep(100);
-			continue;
-		} else if (r == -EINTR)
-			continue;
-		else if (r != 0)
-			break;
-	} while (1);
-
-	if (r < 0)
-		r = -r;
+	} while (events < min);
 
-	return (int) r;
+	return r < 0 ? r : events;
 }
 
 static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
 {
 	struct libaio_data *ld = td->io_ops->data;
-	struct iocb *iocb = &io_u->iocb;
-	long ret;
 
+	fio_ro_check(td, io_u);
+
+	if (ld->iocbs_nr == (int) td->o.iodepth)
+		return FIO_Q_BUSY;
+
+	/*
+	 * fsync is tricky, since it can fail and we need to do it
+	 * serialized with other io. the reason is that linux doesn't
+	 * support aio fsync yet. So return busy for the case where we
+	 * have pending io, to let fio complete those first.
+	 */
+	if (ddir_sync(io_u->ddir)) {
+		if (ld->iocbs_nr)
+			return FIO_Q_BUSY;
+
+		do_io_u_sync(td, io_u);
+		return FIO_Q_COMPLETED;
+	}
+
+	if (io_u->ddir == DDIR_TRIM) {
+		if (ld->iocbs_nr)
+			return FIO_Q_BUSY;
+
+		do_io_u_trim(td, io_u);
+		return FIO_Q_COMPLETED;
+	}
+
+	ld->iocbs[ld->iocbs_nr] = &io_u->iocb;
+	ld->io_us[ld->iocbs_nr] = io_u;
+	ld->iocbs_nr++;
+	return FIO_Q_QUEUED;
+}
+
+static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
+			      unsigned int nr)
+{
+	struct timeval now;
+	unsigned int i;
+
+	if (!fio_fill_issue_time(td))
+		return;
+
+	fio_gettime(&now, NULL);
+
+	for (i = 0; i < nr; i++) {
+		struct io_u *io_u = io_us[i];
+
+		memcpy(&io_u->issue_time, &now, sizeof(now));
+		io_u_queued(td, io_u);
+	}
+}
+
+static int fio_libaio_commit(struct thread_data *td)
+{
+	struct libaio_data *ld = td->io_ops->data;
+	struct iocb **iocbs;
+	struct io_u **io_us;
+	int ret;
+
+	if (!ld->iocbs_nr)
+		return 0;
+
+	io_us = ld->io_us;
+	iocbs = ld->iocbs;
 	do {
-		ret = io_submit(ld->aio_ctx, 1, &iocb);
-		if (ret == 1)
-			return 0;
-		else if (ret == -EAGAIN || !ret)
-			usleep(100);
-		else if (ret == -EINTR)
+		ret = io_submit(ld->aio_ctx, ld->iocbs_nr, iocbs);
+		if (ret > 0) {
+			fio_libaio_queued(td, io_us, ret);
+			io_u_mark_submit(td, ret);
+			ld->iocbs_nr -= ret;
+			io_us += ret;
+			iocbs += ret;
+			ret = 0;
+		} else if (!ret || ret == -EAGAIN || ret == -EINTR) {
+			if (!ret)
+				io_u_mark_submit(td, ret);
 			continue;
-		else
+		} else
 			break;
-	} while (1);
+	} while (ld->iocbs_nr);
 
-	if (ret <= 0) {
-		io_u->resid = io_u->buflen;
-		io_u->error = -ret;
-		return 1;
-	}
-
-	return 0;
+	return ret;
 }
 
 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
@@ -108,64 +245,67 @@ static void fio_libaio_cleanup(struct thread_data *td)
 
 	if (ld) {
 		io_destroy(ld->aio_ctx);
-		if (ld->aio_events)
-			free(ld->aio_events);
-
+		free(ld->aio_events);
+		free(ld->iocbs);
+		free(ld->io_us);
 		free(ld);
-		td->io_ops->data = NULL;
 	}
 }
 
 static int fio_libaio_init(struct thread_data *td)
 {
 	struct libaio_data *ld = malloc(sizeof(*ld));
+	struct libaio_options *o = td->eo;
+	int err = 0;
 
 	memset(ld, 0, sizeof(*ld));
-	if (io_queue_init(td->iodepth, &ld->aio_ctx)) {
-		td_verror(td, errno);
+
+	/*
+	 * First try passing in 0 for queue depth, since we don't
+	 * care about the user ring. If that fails, the kernel is too old
+	 * and we need the right depth.
+	 */
+	if (!o->userspace_reap)
+		err = io_queue_init(INT_MAX, &ld->aio_ctx);
+	if (o->userspace_reap || err == -EINVAL)
+		err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
+	if (err) {
+		td_verror(td, -err, "io_queue_init");
+		log_err("fio: check /proc/sys/fs/aio-max-nr\n");
 		free(ld);
 		return 1;
 	}
 
-	ld->aio_events = malloc(td->iodepth * sizeof(struct io_event));
-	memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event));
+	ld->aio_events = malloc(td->o.iodepth * sizeof(struct io_event));
+	memset(ld->aio_events, 0, td->o.iodepth * sizeof(struct io_event));
+	ld->iocbs = malloc(td->o.iodepth * sizeof(struct iocb *));
+	memset(ld->iocbs, 0, sizeof(struct iocb *));
+	ld->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
+	memset(ld->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
+	ld->iocbs_nr = 0;
+
 	td->io_ops->data = ld;
 	return 0;
 }
 
 static struct ioengine_ops ioengine = {
-	.name		= "libaio",
-	.version	= FIO_IOOPS_VERSION,
-	.init		= fio_libaio_init,
-	.prep		= fio_libaio_prep,
-	.queue		= fio_libaio_queue,
-	.cancel		= fio_libaio_cancel,
-	.getevents	= fio_libaio_getevents,
-	.event		= fio_libaio_event,
-	.cleanup	= fio_libaio_cleanup,
+	.name			= "libaio",
+	.version		= FIO_IOOPS_VERSION,
+	.init			= fio_libaio_init,
+	.prep			= fio_libaio_prep,
+	.queue			= fio_libaio_queue,
+	.commit			= fio_libaio_commit,
+	.cancel			= fio_libaio_cancel,
+	.getevents		= fio_libaio_getevents,
+	.event			= fio_libaio_event,
+	.cleanup		= fio_libaio_cleanup,
+	.open_file		= generic_open_file,
+	.close_file		= generic_close_file,
+	.get_file_size		= generic_get_file_size,
+	.options		= options,
+	.option_struct_size	= sizeof(struct libaio_options),
 };
 
-#else /* FIO_HAVE_LIBAIO */
-
-/*
- * When we have a proper configure system in place, we simply wont build
- * and install this io engine. For now install a crippled version that
- * just complains and fails to load.
- */
-static int fio_libaio_init(struct thread_data fio_unused *td)
-{
-	fprintf(stderr, "fio: libaio not available\n");
-	return 1;
-}
-
-static struct ioengine_ops ioengine = {
-	.name		= "libaio",
-	.version	= FIO_IOOPS_VERSION,
-	.init		= fio_libaio_init,
-};
-
-#endif
-
 static void fio_init fio_libaio_register(void)
 {
 	register_ioengine(&ioengine);