X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Flibaio.c;h=ad34d065a3c3bb5cea63e97963a6a3609cd44707;hp=439cd242dd9e0aab6df2ad65cda1daba35ee0140;hb=c44b1ff54402c589e8f07436ec56efb4f8b1ac23;hpb=a3edaf76b30880c3bf4455c30614ce88cdbbe071

diff --git a/engines/libaio.c b/engines/libaio.c
index 439cd242..ad34d065 100644
--- a/engines/libaio.c
+++ b/engines/libaio.c
@@ -58,26 +58,72 @@ static struct io_u *fio_libaio_event(struct thread_data *td, int event)
 	return io_u;
 }
 
+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;
-	int r;
+	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 >= (int) min)
-			break;
-		else if (r == -EAGAIN) {
+		if (td->o.userspace_libaio_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);
+	} while (events < min);
 
-	return r;
+	return r < 0 ? r : events;
 }
 
 static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)