X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=engines%2Fsyslet-rw.c;h=d4398106632f287674580d426737c16ee6fd2000;hp=32697a88c25b64a281a794b77b1674d54ac20410;hb=0904200b6f113233a28c4c1ddf68f216bd922b78;hpb=a2e1b08afa641078832d69871ae5e404db3e4fc1;ds=inline

diff --git a/engines/syslet-rw.c b/engines/syslet-rw.c
index 32697a88..d4398106 100644
--- a/engines/syslet-rw.c
+++ b/engines/syslet-rw.c
@@ -17,8 +17,8 @@ struct syslet_data {
 	struct io_u **events;
 	unsigned int nr_events;
 	
+	struct async_head_user ahu;
 	struct syslet_uatom **ring;
-	unsigned int ring_index;
 };
 
 /*
@@ -33,13 +33,13 @@ static void fio_syslet_complete(struct thread_data *td)
 		struct io_u *io_u;
 		long ret;
 
-		atom = sd->ring[sd->ring_index];
+		atom = sd->ring[sd->ahu.user_ring_idx];
 		if (!atom)
 			break;
 
-		sd->ring[sd->ring_index] = NULL;
-		if (++sd->ring_index == td->iodepth)
-			sd->ring_index = 0;
+		sd->ring[sd->ahu.user_ring_idx] = NULL;
+		if (++sd->ahu.user_ring_idx == td->iodepth)
+			sd->ahu.user_ring_idx = 0;
 
 		io_u = atom->private;
 		ret = *atom->ret_ptr;
@@ -73,9 +73,9 @@ static int fio_syslet_getevents(struct thread_data *td, int min,
 		 * OK, we need to wait for some events...
 		 */
 		get_events = min - sd->nr_events;
-		ret = async_wait(get_events);
+		ret = async_wait(get_events, sd->ahu.user_ring_idx, &sd->ahu);
 		if (ret < 0)
-			return errno;
+			return -errno;
 	} while (1);
 
 	ret = sd->nr_events;
@@ -112,7 +112,7 @@ static void init_atom(struct syslet_uatom *atom, int nr, void *arg0,
 static void fio_syslet_prep_sync(struct io_u *io_u, struct fio_file *f)
 {
 	init_atom(&io_u->req.atom, __NR_fsync, &f->fd, NULL, NULL, NULL,
-		  &io_u->req.ret, SYSLET_STOP_ON_NEGATIVE, io_u);
+		  &io_u->req.ret, 0, io_u);
 }
 
 static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f)
@@ -128,8 +128,7 @@ static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f)
 		nr = __NR_pwrite64;
 
 	init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf,
-		  &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret,
-		  SYSLET_STOP_ON_NEGATIVE, io_u);
+		  &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, 0, io_u);
 }
 
 static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u)
@@ -144,15 +143,36 @@ static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u)
 	return 0;
 }
 
+static void cachemiss_thread_start(void)
+{
+	while (1)
+		async_thread();
+}
+
+#define THREAD_STACK_SIZE (16384)
+
+static unsigned long thread_stack_alloc()
+{
+	return (unsigned long)malloc(THREAD_STACK_SIZE) + THREAD_STACK_SIZE;
+}
+
 static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u)
 {
 	struct syslet_data *sd = td->io_ops->data;
 	struct syslet_uatom *done;
 	long ret;
 
-	done = async_exec(&io_u->req.atom);
+	if (!sd->ahu.new_thread_stack)
+		sd->ahu.new_thread_stack = thread_stack_alloc();
+
+	/*
+	 * On sync completion, the atom is returned. So on NULL return
+	 * it's queued asynchronously.
+	 */
+	done = async_exec(&io_u->req.atom, &sd->ahu);
+
 	if (!done)
-		return 0;
+		return FIO_Q_QUEUED;
 
 	/*
 	 * completed sync
@@ -162,53 +182,42 @@ static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u)
 		if (ret > 0) {
 			io_u->resid = io_u->xfer_buflen - ret;
 			io_u->error = 0;
-			return ret;
+			return FIO_Q_COMPLETED;
 		} else
 			io_u->error = errno;
 	}
 
-	if (!io_u->error)
-		sd->events[sd->nr_events++] = io_u;
-	else
-		td_verror(td, io_u->error);
+	assert(sd->nr_events < td->iodepth);
+
+	if (io_u->error)
+		td_verror(td, io_u->error, "xfer");
 
-	return io_u->error;
+	return FIO_Q_COMPLETED;
 }
 
 static int async_head_init(struct syslet_data *sd, unsigned int depth)
 {
-	struct async_head_user ahu;
 	unsigned long ring_size;
 
+	memset(&sd->ahu, 0, sizeof(struct async_head_user));
+
 	ring_size = sizeof(struct syslet_uatom *) * depth;
 	sd->ring = malloc(ring_size);
 	memset(sd->ring, 0, ring_size);
 
-	memset(&ahu, 0, sizeof(ahu));
-	ahu.completion_ring = sd->ring;
-	ahu.ring_size_bytes = ring_size;
-	ahu.max_nr_threads = -1;
-
-	if (async_register(&ahu, sizeof(ahu)) < 0) {
-		perror("async_register");
-		fprintf(stderr, "fio: syslet likely not supported\n");
-		free(sd->ring);
-		return 1;
-	}
+	sd->ahu.user_ring_idx = 0;
+	sd->ahu.completion_ring = sd->ring;
+	sd->ahu.ring_size_bytes = ring_size;
+	sd->ahu.head_stack = thread_stack_alloc();
+	sd->ahu.head_eip = (unsigned long)cachemiss_thread_start;
+	sd->ahu.new_thread_eip = (unsigned long)cachemiss_thread_start;
 
 	return 0;
 }
 
-static void async_head_exit(struct syslet_data *sd, unsigned int depth)
+static void async_head_exit(struct syslet_data *sd)
 {
-	struct async_head_user ahu;
-
-	memset(&ahu, 0, sizeof(ahu));
-	ahu.completion_ring = sd->ring;
-	ahu.ring_size_bytes = sizeof(struct syslet_uatom *) * depth;
-
-	if (async_unregister(&ahu, sizeof(ahu)) < 0)
-		perror("async_register");
+	free(sd->ring);
 }
 
 static void fio_syslet_cleanup(struct thread_data *td)
@@ -216,7 +225,7 @@ static void fio_syslet_cleanup(struct thread_data *td)
 	struct syslet_data *sd = td->io_ops->data;
 
 	if (sd) {
-		async_head_exit(sd, td->iodepth);
+		async_head_exit(sd);
 		free(sd->events);
 		free(sd);
 		td->io_ops->data = NULL;