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block: add trace events for io_uring 

Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20200120141858.587874-10-stefanha@redhat.com
Message-Id: <20200120141858.587874-10-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Aarushi Mehta 2020-01-20 14:18:52 +00:00 committed by Stefan Hajnoczi
parent c644751069
commit d803f59050
2 changed files with 32 additions and 3 deletions
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23
block/io_uring.c
View File

@ -17,6 +17,7 @@
#include "block/raw-aio.h"
#include "qemu/coroutine.h"
#include "qapi/error.h"
#include "trace.h"
/* io_uring ring size */
#define MAX_ENTRIES 128
@ -85,6 +86,8 @@ static void luring_resubmit_short_read(LuringState *s, LuringAIOCB *luringcb,
QEMUIOVector *resubmit_qiov;
size_t remaining;
trace_luring_resubmit_short_read(s, luringcb, nread);
/* Update read position */
luringcb->total_read = nread;
remaining = luringcb->qiov->size - luringcb->total_read;
@ -156,6 +159,7 @@ static void luring_process_completions(LuringState *s)
/* Change counters one-by-one because we can be nested. */
s->io_q.in_flight--;
trace_luring_process_completion(s, luringcb, ret);
/* total_read is non-zero only for resubmitted read requests */
total_bytes = ret + luringcb->total_read;
@ -224,6 +228,7 @@ static int ioq_submit(LuringState *s)
QSIMPLEQ_REMOVE_HEAD(&s->io_q.submit_queue, next);
}
ret = io_uring_submit(&s->ring);
trace_luring_io_uring_submit(s, ret);
/* Prevent infinite loop if submission is refused */
if (ret <= 0) {
if (ret == -EAGAIN) {
@ -280,12 +285,15 @@ static void ioq_init(LuringQueue *io_q)
void luring_io_plug(BlockDriverState *bs, LuringState *s)
{
trace_luring_io_plug(s);
s->io_q.plugged++;
}
void luring_io_unplug(BlockDriverState *bs, LuringState *s)
{
assert(s->io_q.plugged);
trace_luring_io_unplug(s, s->io_q.blocked, s->io_q.plugged,
s->io_q.in_queue, s->io_q.in_flight);
if (--s->io_q.plugged == 0 &&
!s->io_q.blocked && s->io_q.in_queue > 0) {
ioq_submit(s);
@ -306,6 +314,7 @@ void luring_io_unplug(BlockDriverState *bs, LuringState *s)
static int luring_do_submit(int fd, LuringAIOCB *luringcb, LuringState *s,
uint64_t offset, int type)
{
int ret;
struct io_uring_sqe *sqes = &luringcb->sqeq;
switch (type) {
@ -329,11 +338,14 @@ static int luring_do_submit(int fd, LuringAIOCB *luringcb, LuringState *s,
QSIMPLEQ_INSERT_TAIL(&s->io_q.submit_queue, luringcb, next);
s->io_q.in_queue++;
trace_luring_do_submit(s, s->io_q.blocked, s->io_q.plugged,
s->io_q.in_queue, s->io_q.in_flight);
if (!s->io_q.blocked &&
(!s->io_q.plugged ||
s->io_q.in_flight + s->io_q.in_queue >= MAX_ENTRIES)) {
return ioq_submit(s);
ret = ioq_submit(s);
trace_luring_do_submit_done(s, ret);
return ret;
}
return 0;
}
@ -348,8 +360,10 @@ int coroutine_fn luring_co_submit(BlockDriverState *bs, LuringState *s, int fd,
.qiov = qiov,
.is_read = (type == QEMU_AIO_READ),
};
trace_luring_co_submit(bs, s, &luringcb, fd, offset, qiov ? qiov->size : 0,
type);
ret = luring_do_submit(fd, &luringcb, s, offset, type);
if (ret < 0) {
return ret;
}
@ -382,6 +396,8 @@ LuringState *luring_init(Error **errp)
LuringState *s = g_new0(LuringState, 1);
struct io_uring *ring = &s->ring;
trace_luring_init_state(s, sizeof(*s));
rc = io_uring_queue_init(MAX_ENTRIES, ring, 0);
if (rc < 0) {
error_setg_errno(errp, errno, "failed to init linux io_uring ring");
@ -398,4 +414,5 @@ void luring_cleanup(LuringState *s)
{
io_uring_queue_exit(&s->ring);
g_free(s);
trace_luring_cleanup_state(s);
}

12
block/trace-events
View File

@ -63,6 +63,18 @@ qmp_block_stream(void *bs) "bs %p"
file_paio_submit(void *acb, void *opaque, int64_t offset, int count, int type) "acb %p opaque %p offset %"PRId64" count %d type %d"
file_copy_file_range(void *bs, int src, int64_t src_off, int dst, int64_t dst_off, int64_t bytes, int flags, int64_t ret) "bs %p src_fd %d offset %"PRIu64" dst_fd %d offset %"PRIu64" bytes %"PRIu64" flags %d ret %"PRId64
#io_uring.c
luring_init_state(void *s, size_t size) "s %p size %zu"
luring_cleanup_state(void *s) "%p freed"
luring_io_plug(void *s) "LuringState %p plug"
luring_io_unplug(void *s, int blocked, int plugged, int queued, int inflight) "LuringState %p blocked %d plugged %d queued %d inflight %d"
luring_do_submit(void *s, int blocked, int plugged, int queued, int inflight) "LuringState %p blocked %d plugged %d queued %d inflight %d"
luring_do_submit_done(void *s, int ret) "LuringState %p submitted to kernel %d"
luring_co_submit(void *bs, void *s, void *luringcb, int fd, uint64_t offset, size_t nbytes, int type) "bs %p s %p luringcb %p fd %d offset %" PRId64 " nbytes %zd type %d"
luring_process_completion(void *s, void *aiocb, int ret) "LuringState %p luringcb %p ret %d"
luring_io_uring_submit(void *s, int ret) "LuringState %p ret %d"
luring_resubmit_short_read(void *s, void *luringcb, int nread) "LuringState %p luringcb %p nread %d"
# qcow2.c
qcow2_add_task(void *co, void *bs, void *pool, const char *action, int cluster_type, uint64_t file_cluster_offset, uint64_t offset, uint64_t bytes, void *qiov, size_t qiov_offset) "co %p bs %p pool %p: %s: cluster_type %d file_cluster_offset %" PRIu64 " offset %" PRIu64 " bytes %" PRIu64 " qiov %p qiov_offset %zu"
qcow2_writev_start_req(void *co, int64_t offset, int bytes) "co %p offset 0x%" PRIx64 " bytes %d"