Stop using the .bdrv_co_io_plug() API because it is not multi-queue
block layer friendly. Use the new blk_io_plug_call() API to batch I/O
submission instead.
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Reviewed-by: Eric Blake <eblake@xxxxxxxxxx>
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Acked-by: Kevin Wolf <kwolf@xxxxxxxxxx>
Message-id: 20230530180959.1108766-5-stefanha@xxxxxxxxxx
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
---
include/block/raw-aio.h | 7 -------
block/file-posix.c | 10 ----------
block/io_uring.c | 44 ++++++++++++++++-------------------------
block/trace-events | 5 ++---
4 files changed, 19 insertions(+), 47 deletions(-)
diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h
index 0fe85ade77..da60ca13ef 100644
--- a/include/block/raw-aio.h
+++ b/include/block/raw-aio.h
@@ -81,13 +81,6 @@ int coroutine_fn luring_co_submit(BlockDriverState *bs, int fd, uint64_t offset,
QEMUIOVector *qiov, int type);
void luring_detach_aio_context(LuringState *s, AioContext *old_context);
void luring_attach_aio_context(LuringState *s, AioContext *new_context);
-
-/*
- * luring_io_plug/unplug work in the thread's current AioContext, therefore the
- * caller must ensure that they are paired in the same IOThread.
- */
-void luring_io_plug(void);
-void luring_io_unplug(void);
#endif
#ifdef _WIN32
diff --git a/block/file-posix.c b/block/file-posix.c
index 0ab158efba..7baa8491dd 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2558,11 +2558,6 @@ static void coroutine_fn raw_co_io_plug(BlockDriverState *bs)
laio_io_plug();
}
#endif
-#ifdef CONFIG_LINUX_IO_URING
- if (s->use_linux_io_uring) {
- luring_io_plug();
- }
-#endif
}
static void coroutine_fn raw_co_io_unplug(BlockDriverState *bs)
@@ -2573,11 +2568,6 @@ static void coroutine_fn raw_co_io_unplug(BlockDriverState *bs)
laio_io_unplug(s->aio_max_batch);
}
#endif
-#ifdef CONFIG_LINUX_IO_URING
- if (s->use_linux_io_uring) {
- luring_io_unplug();
- }
-#endif
}
static int coroutine_fn raw_co_flush_to_disk(BlockDriverState *bs)
diff --git a/block/io_uring.c b/block/io_uring.c
index 3a77480e16..69d9820928 100644
--- a/block/io_uring.c
+++ b/block/io_uring.c
@@ -16,6 +16,7 @@
#include "block/raw-aio.h"
#include "qemu/coroutine.h"
#include "qapi/error.h"
+#include "sysemu/block-backend.h"
#include "trace.h"
/* Only used for assertions. */
@@ -41,7 +42,6 @@ typedef struct LuringAIOCB {
} LuringAIOCB;
typedef struct LuringQueue {
- int plugged;
unsigned int in_queue;
unsigned int in_flight;
bool blocked;
@@ -267,7 +267,7 @@ static void luring_process_completions_and_submit(LuringState *s)
{
luring_process_completions(s);
- if (!s->io_q.plugged && s->io_q.in_queue > 0) {
+ if (s->io_q.in_queue > 0) {
ioq_submit(s);
}
}
@@ -301,29 +301,17 @@ static void qemu_luring_poll_ready(void *opaque)
static void ioq_init(LuringQueue *io_q)
{
QSIMPLEQ_INIT(&io_q->submit_queue);
- io_q->plugged = 0;
io_q->in_queue = 0;
io_q->in_flight = 0;
io_q->blocked = false;
}
-void luring_io_plug(void)
+static void luring_unplug_fn(void *opaque)
{
- AioContext *ctx = qemu_get_current_aio_context();
- LuringState *s = aio_get_linux_io_uring(ctx);
- trace_luring_io_plug(s);
- s->io_q.plugged++;
-}
-
-void luring_io_unplug(void)
-{
- AioContext *ctx = qemu_get_current_aio_context();
- LuringState *s = aio_get_linux_io_uring(ctx);
- 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) {
+ LuringState *s = opaque;
+ trace_luring_unplug_fn(s, s->io_q.blocked, s->io_q.in_queue,
+ s->io_q.in_flight);
+ if (!s->io_q.blocked && s->io_q.in_queue > 0) {
ioq_submit(s);
}
}
@@ -370,14 +358,16 @@ 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)) {
- ret = ioq_submit(s);
- trace_luring_do_submit_done(s, ret);
- return ret;
+ trace_luring_do_submit(s, s->io_q.blocked, s->io_q.in_queue,
+ s->io_q.in_flight);
+ if (!s->io_q.blocked) {
+ if (s->io_q.in_flight + s->io_q.in_queue >= MAX_ENTRIES) {
+ ret = ioq_submit(s);
+ trace_luring_do_submit_done(s, ret);
+ return ret;
+ }
+
+ blk_io_plug_call(luring_unplug_fn, s);
}
return 0;
}
diff --git a/block/trace-events b/block/trace-events
index 048ad27519..6f121b7636 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -64,9 +64,8 @@ file_paio_submit(void *acb, void *opaque, int64_t offset, int count, int type) "
# 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_unplug_fn(void *s, int blocked, int queued, int inflight) "LuringState %p blocked %d queued %d inflight %d"
+luring_do_submit(void *s, int blocked, int queued, int inflight) "LuringState %p blocked %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"
--
2.40.1
