/*
- * read/write() engine that uses syslet to be async
+ * syslet engine
+ *
+ * IO engine that does regular pread(2)/pwrite(2) to transfer data, but
+ * with syslets to make the execution async.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
+#include <asm/unistd.h>
#include "../fio.h"
-#include "../os.h"
#ifdef FIO_HAVE_SYSLET
+#ifdef __NR_pread64
+#define __NR_fio_pread __NR_pread64
+#define __NR_fio_pwrite __NR_pwrite64
+#else
+#define __NR_fio_pread __NR_pread
+#define __NR_fio_pwrite __NR_pwrite
+#endif
+
+#define ATOM_TO_IOU(p) ((struct io_u *) (unsigned long) (p))
+
struct syslet_data {
struct io_u **events;
unsigned int nr_events;
struct async_head_user ahu;
struct syslet_uatom **ring;
+
+ struct syslet_uatom *head, *tail;
};
+static void fio_syslet_complete_atom(struct thread_data *td,
+ struct syslet_uatom *atom)
+{
+ struct syslet_data *sd = td->io_ops->data;
+ struct syslet_uatom *last;
+ struct io_u *io_u;
+
+ /*
+ * complete from the beginning of the sequence up to (and
+ * including) this atom
+ */
+ last = atom;
+ io_u = ATOM_TO_IOU(atom);
+ atom = io_u->req.head;
+
+ /*
+ * now complete in right order
+ */
+ do {
+ long ret;
+
+ io_u = ATOM_TO_IOU(atom);
+ ret = *(long *) (unsigned long) atom->ret_ptr;
+ if (ret >= 0)
+ io_u->resid = io_u->xfer_buflen - ret;
+ else if (ret < 0)
+ io_u->error = ret;
+
+ assert(sd->nr_events < td->o.iodepth);
+ sd->events[sd->nr_events++] = io_u;
+
+ if (atom == last)
+ break;
+
+ atom = (struct syslet_uatom *) (unsigned long) atom->next;
+ } while (1);
+
+ assert(!last->next);
+}
+
/*
* Inspect the ring to see if we have completed events
*/
do {
struct syslet_uatom *atom;
- struct io_u *io_u;
- long ret;
atom = sd->ring[sd->ahu.user_ring_idx];
if (!atom)
break;
sd->ring[sd->ahu.user_ring_idx] = NULL;
- if (++sd->ahu.user_ring_idx == td->iodepth)
+ if (++sd->ahu.user_ring_idx == td->o.iodepth)
sd->ahu.user_ring_idx = 0;
- io_u = atom->private;
- ret = *atom->ret_ptr;
- if (ret > 0)
- io_u->resid = io_u->xfer_buflen - ret;
- else if (ret < 0)
- io_u->error = ret;
-
- sd->events[sd->nr_events++] = io_u;
+ fio_syslet_complete_atom(td, atom);
} while (1);
}
struct timespec fio_unused *t)
{
struct syslet_data *sd = td->io_ops->data;
- int get_events;
long ret;
do {
/*
* OK, we need to wait for some events...
*/
- get_events = min - sd->nr_events;
- ret = async_wait(get_events, sd->ahu.user_ring_idx, &sd->ahu);
+ ret = async_wait(1, sd->ahu.user_ring_idx, &sd->ahu);
if (ret < 0)
return -errno;
} while (1);
{
atom->flags = flags;
atom->nr = nr;
- atom->ret_ptr = ret_ptr;
- atom->next = NULL;
- atom->arg_ptr[0] = arg0;
- atom->arg_ptr[1] = arg1;
- atom->arg_ptr[2] = arg2;
- atom->arg_ptr[3] = arg3;
- atom->arg_ptr[4] = atom->arg_ptr[5] = NULL;
- atom->private = priv;
+ atom->ret_ptr = (uint64_t) (unsigned long) ret_ptr;
+ atom->next = 0;
+ atom->arg_ptr[0] = (uint64_t) (unsigned long) arg0;
+ atom->arg_ptr[1] = (uint64_t) (unsigned long) arg1;
+ atom->arg_ptr[2] = (uint64_t) (unsigned long) arg2;
+ atom->arg_ptr[3] = (uint64_t) (unsigned long) arg3;
+ atom->arg_ptr[4] = 0;
+ atom->arg_ptr[5] = 0;
+ atom->private = (uint64_t) (unsigned long) priv;
}
/*
* prepare rw
*/
if (io_u->ddir == DDIR_READ)
- nr = __NR_pread64;
+ nr = __NR_fio_pread;
else
- nr = __NR_pwrite64;
+ nr = __NR_fio_pwrite;
init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf,
&io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, 0, io_u);
static void cachemiss_thread_start(void)
{
while (1)
- async_thread();
+ async_thread(NULL, NULL);
}
#define THREAD_STACK_SIZE (16384)
static unsigned long thread_stack_alloc()
{
- return (unsigned long)malloc(THREAD_STACK_SIZE) + THREAD_STACK_SIZE;
+ return (unsigned long) malloc(THREAD_STACK_SIZE) + THREAD_STACK_SIZE;
}
-static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u)
+static void fio_syslet_queued(struct thread_data *td, struct syslet_data *sd)
+{
+ struct syslet_uatom *atom;
+ struct timeval now;
+
+ fio_gettime(&now, NULL);
+
+ atom = sd->head;
+ while (atom) {
+ struct io_u *io_u = ATOM_TO_IOU(atom);
+
+ memcpy(&io_u->issue_time, &now, sizeof(now));
+ io_u_queued(td, io_u);
+ atom = (struct syslet_uatom *) (unsigned long) atom->next;
+ }
+}
+
+static int fio_syslet_commit(struct thread_data *td)
{
struct syslet_data *sd = td->io_ops->data;
struct syslet_uatom *done;
- long ret;
+
+ if (!sd->head)
+ return 0;
+
+ assert(!sd->tail->next);
if (!sd->ahu.new_thread_stack)
sd->ahu.new_thread_stack = thread_stack_alloc();
+ fio_syslet_queued(td, sd);
+
/*
* On sync completion, the atom is returned. So on NULL return
* it's queued asynchronously.
*/
- done = async_exec(&io_u->req.atom, &sd->ahu);
+ done = async_exec(sd->head, &sd->ahu);
- if (!done)
- return FIO_Q_QUEUED;
-
- /*
- * completed sync
- */
- ret = io_u->req.ret;
- if (ret != (long) io_u->xfer_buflen) {
- if (ret > 0) {
- io_u->resid = io_u->xfer_buflen - ret;
- io_u->error = 0;
- return FIO_Q_COMPLETED;
- } else
- io_u->error = errno;
+ if (done == (void *) -1) {
+ log_err("fio: syslets don't appear to work\n");
+ return -1;
}
- assert(sd->nr_events < td->iodepth);
+ sd->head = sd->tail = NULL;
- if (io_u->error)
- td_verror(td, io_u->error, "xfer");
+ if (done)
+ fio_syslet_complete_atom(td, done);
- return FIO_Q_COMPLETED;
+ return 0;
+}
+
+static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u)
+{
+ struct syslet_data *sd = td->io_ops->data;
+
+ fio_ro_check(td, io_u);
+
+ if (sd->tail) {
+ sd->tail->next = (uint64_t) (unsigned long) &io_u->req.atom;
+ sd->tail = &io_u->req.atom;
+ } else
+ sd->head = sd->tail = (struct syslet_uatom *)&io_u->req.atom;
+
+ io_u->req.head = sd->head;
+ return FIO_Q_QUEUED;
}
static int async_head_init(struct syslet_data *sd, unsigned int depth)
memset(sd->ring, 0, ring_size);
sd->ahu.user_ring_idx = 0;
- sd->ahu.completion_ring = sd->ring;
+ sd->ahu.completion_ring_ptr = (uint64_t) (unsigned long) 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;
+ sd->ahu.head_ip = (uint64_t) (unsigned long) cachemiss_thread_start;
+ sd->ahu.new_thread_ip = (uint64_t) (unsigned long) cachemiss_thread_start;
+ sd->ahu.new_thread_stack = thread_stack_alloc();
return 0;
}
free(sd->ring);
}
+static int check_syslet_support(struct syslet_data *sd)
+{
+ struct syslet_uatom atom;
+ void *ret;
+
+ init_atom(&atom, __NR_getpid, NULL, NULL, NULL, NULL, NULL, 0, NULL);
+ ret = async_exec(&atom, &sd->ahu);
+ if (ret == (void *) -1)
+ return 1;
+
+ return 0;
+}
+
static void fio_syslet_cleanup(struct thread_data *td)
{
struct syslet_data *sd = td->io_ops->data;
{
struct syslet_data *sd;
-
sd = malloc(sizeof(*sd));
memset(sd, 0, sizeof(*sd));
- sd->events = malloc(sizeof(struct io_u *) * td->iodepth);
- memset(sd->events, 0, sizeof(struct io_u *) * td->iodepth);
+ sd->events = malloc(sizeof(struct io_u *) * td->o.iodepth);
+ memset(sd->events, 0, sizeof(struct io_u *) * td->o.iodepth);
/*
* This will handily fail for kernels where syslet isn't available
*/
- if (async_head_init(sd, td->iodepth)) {
+ if (async_head_init(sd, td->o.iodepth)) {
+ free(sd->events);
+ free(sd);
+ return 1;
+ }
+
+ if (check_syslet_support(sd)) {
+ log_err("fio: syslets do not appear to work\n");
free(sd->events);
free(sd);
return 1;
.init = fio_syslet_init,
.prep = fio_syslet_prep,
.queue = fio_syslet_queue,
+ .commit = fio_syslet_commit,
.getevents = fio_syslet_getevents,
.event = fio_syslet_event,
.cleanup = fio_syslet_cleanup,
+ .open_file = generic_open_file,
+ .close_file = generic_close_file,
};
#else /* FIO_HAVE_SYSLET */
projects / fio.git / blobdiff