Libaio engine support for iodepth_batch_complete=0
Previously, even if iodepth_batch_complete=0, the libaio engine
passed in non-zero values for the min_nr value for io_getevents.
This patch makes min_nr always 0 if iodepth_batch_complete == 0,
and if multiple events are required at a higher level, then
we poll io_getevents multiple times for the events.
Signed-off-by: Dan Ehrenberg <dehrenberg@google.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/engines/libaio.c b/engines/libaio.c
index 439cd24..c837ab6 100644
--- a/engines/libaio.c
+++ b/engines/libaio.c
@@ -62,22 +62,18 @@
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) {
+ 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)