* [PATCH v3 0/3] Inline sqe_submit
@ 2019-11-06 22:41 Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 1/3] io_uring: allocate io_kiocb upfront Pavel Begunkov
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Pavel Begunkov @ 2019-11-06 22:41 UTC (permalink / raw)
To: Jens Axboe, io-uring, linux-block
The idea is to not pass struct sqe_submit as a separate entity,
but always use req->submit instead, so there will be less stuff to
care about.
Also, I've got steady +1% throughput improvement for nop tests.
Though, it's highly system-dependent, and I wouldn't count on it.
v2: fix use-after-free catched by Jens
v3: -EAGAIN, in case submission failed
Pavel Begunkov (3):
io_uring: allocate io_kiocb upfront
io_uring: Use submit info inlined into req
io_uring: use inlined struct sqe_submit
fs/io_uring.c | 134 +++++++++++++++++++++++++-------------------------
1 file changed, 67 insertions(+), 67 deletions(-)
--
2.23.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v3 1/3] io_uring: allocate io_kiocb upfront
2019-11-06 22:41 [PATCH v3 0/3] Inline sqe_submit Pavel Begunkov
@ 2019-11-06 22:41 ` Pavel Begunkov
2019-11-06 22:47 ` Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 2/3] io_uring: Use submit info inlined into req Pavel Begunkov
` (2 subsequent siblings)
3 siblings, 1 reply; 6+ messages in thread
From: Pavel Begunkov @ 2019-11-06 22:41 UTC (permalink / raw)
To: Jens Axboe, io-uring, linux-block
Let io_submit_sqes() to allocate io_kiocb before fetching an sqe.
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 27 ++++++++++++++-------------
1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 6524898831e0..ceb616dbe710 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2551,30 +2551,23 @@ static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK)
-static void io_submit_sqe(struct io_ring_ctx *ctx, struct sqe_submit *s,
- struct io_submit_state *state, struct io_kiocb **link)
+static void io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
+ struct sqe_submit *s, struct io_submit_state *state,
+ struct io_kiocb **link)
{
struct io_uring_sqe *sqe_copy;
- struct io_kiocb *req;
int ret;
/* enforce forwards compatibility on users */
if (unlikely(s->sqe->flags & ~SQE_VALID_FLAGS)) {
ret = -EINVAL;
- goto err;
- }
-
- req = io_get_req(ctx, state);
- if (unlikely(!req)) {
- ret = -EAGAIN;
- goto err;
+ goto err_req;
}
ret = io_req_set_file(ctx, s, state, req);
if (unlikely(ret)) {
err_req:
io_free_req(req, NULL);
-err:
io_cqring_add_event(ctx, s->sqe->user_data, ret);
return;
}
@@ -2710,9 +2703,15 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
for (i = 0; i < nr; i++) {
struct sqe_submit s;
+ struct io_kiocb *req;
- if (!io_get_sqring(ctx, &s))
+ req = io_get_req(ctx, statep);
+ if (unlikely(!req))
break;
+ if (!io_get_sqring(ctx, &s)) {
+ __io_free_req(req);
+ break;
+ }
if (io_sqe_needs_user(s.sqe) && !*mm) {
mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm);
@@ -2740,7 +2739,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
s.in_async = async;
s.needs_fixed_file = async;
trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, async);
- io_submit_sqe(ctx, &s, statep, &link);
+ io_submit_sqe(ctx, req, &s, statep, &link);
submitted++;
/*
@@ -4009,6 +4008,8 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
cur_mm = ctx->sqo_mm;
submitted = io_submit_sqes(ctx, to_submit, f.file, fd,
&cur_mm, false);
+ if (!submitted)
+ submitted = -EAGAIN;
mutex_unlock(&ctx->uring_lock);
}
if (flags & IORING_ENTER_GETEVENTS) {
--
2.23.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 2/3] io_uring: Use submit info inlined into req
2019-11-06 22:41 [PATCH v3 0/3] Inline sqe_submit Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 1/3] io_uring: allocate io_kiocb upfront Pavel Begunkov
@ 2019-11-06 22:41 ` Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 3/3] io_uring: use inlined struct sqe_submit Pavel Begunkov
2019-11-06 22:47 ` [PATCH v3 0/3] Inline sqe_submit Jens Axboe
3 siblings, 0 replies; 6+ messages in thread
From: Pavel Begunkov @ 2019-11-06 22:41 UTC (permalink / raw)
To: Jens Axboe, io-uring, linux-block
Stack allocated struct sqe_submit is passed down to the submission path
along with a request (a.k.a. struct io_kiocb), and will be copied into
req->submit for async requests.
As space for it is already allocated, fill req->submit in the first
place instead of using on-stack one. As a result:
1. sqe->submit is the only place for sqe_submit and is always valid,
so we don't need to track which one to use.
2. don't need to copy in case of async
3. allows to simplify the code by not carrying it as an argument all
the way down
4. allows to reduce number of function arguments / potentially improve
spilling
The downside is that stack is most probably be cached, that's not true
for just allocated memory for a request. Another concern is cache
pollution. Though, a request would be touched and fetched along with
req->submit at some point anyway, so shouldn't be a problem.
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index ceb616dbe710..c0d2601dc17b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2456,7 +2456,6 @@ static int __io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
sqe_copy = kmemdup(s->sqe, sizeof(*sqe_copy), GFP_KERNEL);
if (sqe_copy) {
s->sqe = sqe_copy;
- memcpy(&req->submit, s, sizeof(*s));
if (req->work.flags & IO_WQ_WORK_NEEDS_FILES) {
ret = io_grab_files(ctx, req);
if (ret) {
@@ -2591,13 +2590,11 @@ static void io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
}
s->sqe = sqe_copy;
- memcpy(&req->submit, s, sizeof(*s));
trace_io_uring_link(ctx, req, prev);
list_add_tail(&req->list, &prev->link_list);
} else if (s->sqe->flags & IOSQE_IO_LINK) {
req->flags |= REQ_F_LINK;
- memcpy(&req->submit, s, sizeof(*s));
INIT_LIST_HEAD(&req->link_list);
*link = req;
} else {
@@ -2702,18 +2699,18 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
}
for (i = 0; i < nr; i++) {
- struct sqe_submit s;
struct io_kiocb *req;
+ unsigned int sqe_flags;
req = io_get_req(ctx, statep);
if (unlikely(!req))
break;
- if (!io_get_sqring(ctx, &s)) {
+ if (!io_get_sqring(ctx, &req->submit)) {
__io_free_req(req);
break;
}
- if (io_sqe_needs_user(s.sqe) && !*mm) {
+ if (io_sqe_needs_user(req->submit.sqe) && !*mm) {
mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm);
if (!mm_fault) {
use_mm(ctx->sqo_mm);
@@ -2721,7 +2718,9 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
}
}
- if (link && (s.sqe->flags & IOSQE_IO_DRAIN)) {
+ sqe_flags = req->submit.sqe->flags;
+
+ if (link && (sqe_flags & IOSQE_IO_DRAIN)) {
if (!shadow_req) {
shadow_req = io_get_req(ctx, NULL);
if (unlikely(!shadow_req))
@@ -2729,24 +2728,25 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
shadow_req->flags |= (REQ_F_IO_DRAIN | REQ_F_SHADOW_DRAIN);
refcount_dec(&shadow_req->refs);
}
- shadow_req->sequence = s.sequence;
+ shadow_req->sequence = req->submit.sequence;
}
out:
- s.ring_file = ring_file;
- s.ring_fd = ring_fd;
- s.has_user = *mm != NULL;
- s.in_async = async;
- s.needs_fixed_file = async;
- trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, async);
- io_submit_sqe(ctx, req, &s, statep, &link);
+ req->submit.ring_file = ring_file;
+ req->submit.ring_fd = ring_fd;
+ req->submit.has_user = *mm != NULL;
+ req->submit.in_async = async;
+ req->submit.needs_fixed_file = async;
+ trace_io_uring_submit_sqe(ctx, req->submit.sqe->user_data,
+ true, async);
+ io_submit_sqe(ctx, req, &req->submit, statep, &link);
submitted++;
/*
* If previous wasn't linked and we have a linked command,
* that's the end of the chain. Submit the previous link.
*/
- if (!(s.sqe->flags & IOSQE_IO_LINK) && link) {
+ if (!(sqe_flags & IOSQE_IO_LINK) && link) {
io_queue_link_head(ctx, link, &link->submit, shadow_req);
link = NULL;
shadow_req = NULL;
--
2.23.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v3 3/3] io_uring: use inlined struct sqe_submit
2019-11-06 22:41 [PATCH v3 0/3] Inline sqe_submit Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 1/3] io_uring: allocate io_kiocb upfront Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 2/3] io_uring: Use submit info inlined into req Pavel Begunkov
@ 2019-11-06 22:41 ` Pavel Begunkov
2019-11-06 22:47 ` [PATCH v3 0/3] Inline sqe_submit Jens Axboe
3 siblings, 0 replies; 6+ messages in thread
From: Pavel Begunkov @ 2019-11-06 22:41 UTC (permalink / raw)
To: Jens Axboe, io-uring, linux-block
req->submit is always up-to-date, use it directly
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 87 +++++++++++++++++++++++++--------------------------
1 file changed, 43 insertions(+), 44 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index c0d2601dc17b..2c56c3b9c828 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1155,10 +1155,9 @@ static bool io_file_supports_async(struct file *file)
return false;
}
-static int io_prep_rw(struct io_kiocb *req, const struct sqe_submit *s,
- bool force_nonblock)
+static int io_prep_rw(struct io_kiocb *req, bool force_nonblock)
{
- const struct io_uring_sqe *sqe = s->sqe;
+ const struct io_uring_sqe *sqe = req->submit.sqe;
struct io_ring_ctx *ctx = req->ctx;
struct kiocb *kiocb = &req->rw;
unsigned ioprio;
@@ -1406,8 +1405,8 @@ static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb,
return ret;
}
-static int io_read(struct io_kiocb *req, const struct sqe_submit *s,
- struct io_kiocb **nxt, bool force_nonblock)
+static int io_read(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
{
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct kiocb *kiocb = &req->rw;
@@ -1416,7 +1415,7 @@ static int io_read(struct io_kiocb *req, const struct sqe_submit *s,
size_t iov_count;
ssize_t read_size, ret;
- ret = io_prep_rw(req, s, force_nonblock);
+ ret = io_prep_rw(req, force_nonblock);
if (ret)
return ret;
file = kiocb->ki_filp;
@@ -1424,7 +1423,7 @@ static int io_read(struct io_kiocb *req, const struct sqe_submit *s,
if (unlikely(!(file->f_mode & FMODE_READ)))
return -EBADF;
- ret = io_import_iovec(req->ctx, READ, s, &iovec, &iter);
+ ret = io_import_iovec(req->ctx, READ, &req->submit, &iovec, &iter);
if (ret < 0)
return ret;
@@ -1456,7 +1455,7 @@ static int io_read(struct io_kiocb *req, const struct sqe_submit *s,
ret2 = -EAGAIN;
/* Catch -EAGAIN return for forced non-blocking submission */
if (!force_nonblock || ret2 != -EAGAIN)
- kiocb_done(kiocb, ret2, nxt, s->in_async);
+ kiocb_done(kiocb, ret2, nxt, req->submit.in_async);
else
ret = -EAGAIN;
}
@@ -1464,8 +1463,8 @@ static int io_read(struct io_kiocb *req, const struct sqe_submit *s,
return ret;
}
-static int io_write(struct io_kiocb *req, const struct sqe_submit *s,
- struct io_kiocb **nxt, bool force_nonblock)
+static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
+ bool force_nonblock)
{
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct kiocb *kiocb = &req->rw;
@@ -1474,7 +1473,7 @@ static int io_write(struct io_kiocb *req, const struct sqe_submit *s,
size_t iov_count;
ssize_t ret;
- ret = io_prep_rw(req, s, force_nonblock);
+ ret = io_prep_rw(req, force_nonblock);
if (ret)
return ret;
@@ -1482,7 +1481,7 @@ static int io_write(struct io_kiocb *req, const struct sqe_submit *s,
if (unlikely(!(file->f_mode & FMODE_WRITE)))
return -EBADF;
- ret = io_import_iovec(req->ctx, WRITE, s, &iovec, &iter);
+ ret = io_import_iovec(req->ctx, WRITE, &req->submit, &iovec, &iter);
if (ret < 0)
return ret;
@@ -1519,7 +1518,7 @@ static int io_write(struct io_kiocb *req, const struct sqe_submit *s,
else
ret2 = loop_rw_iter(WRITE, file, kiocb, &iter);
if (!force_nonblock || ret2 != -EAGAIN)
- kiocb_done(kiocb, ret2, nxt, s->in_async);
+ kiocb_done(kiocb, ret2, nxt, req->submit.in_async);
else
ret = -EAGAIN;
}
@@ -2188,9 +2187,9 @@ static int io_async_cancel(struct io_kiocb *req, const struct io_uring_sqe *sqe,
return 0;
}
-static int io_req_defer(struct io_ring_ctx *ctx, struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+static int io_req_defer(struct io_ring_ctx *ctx, struct io_kiocb *req)
{
+ const struct io_uring_sqe *sqe = req->submit.sqe;
struct io_uring_sqe *sqe_copy;
if (!io_sequence_defer(ctx, req) && list_empty(&ctx->defer_list))
@@ -2217,10 +2216,10 @@ static int io_req_defer(struct io_ring_ctx *ctx, struct io_kiocb *req,
}
static int __io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
- const struct sqe_submit *s, struct io_kiocb **nxt,
- bool force_nonblock)
+ struct io_kiocb **nxt, bool force_nonblock)
{
int ret, opcode;
+ struct sqe_submit *s = &req->submit;
req->user_data = READ_ONCE(s->sqe->user_data);
@@ -2232,18 +2231,18 @@ static int __io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
case IORING_OP_READV:
if (unlikely(s->sqe->buf_index))
return -EINVAL;
- ret = io_read(req, s, nxt, force_nonblock);
+ ret = io_read(req, nxt, force_nonblock);
break;
case IORING_OP_WRITEV:
if (unlikely(s->sqe->buf_index))
return -EINVAL;
- ret = io_write(req, s, nxt, force_nonblock);
+ ret = io_write(req, nxt, force_nonblock);
break;
case IORING_OP_READ_FIXED:
- ret = io_read(req, s, nxt, force_nonblock);
+ ret = io_read(req, nxt, force_nonblock);
break;
case IORING_OP_WRITE_FIXED:
- ret = io_write(req, s, nxt, force_nonblock);
+ ret = io_write(req, nxt, force_nonblock);
break;
case IORING_OP_FSYNC:
ret = io_fsync(req, s->sqe, nxt, force_nonblock);
@@ -2318,7 +2317,7 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
s->has_user = (work->flags & IO_WQ_WORK_HAS_MM) != 0;
s->in_async = true;
do {
- ret = __io_submit_sqe(ctx, req, s, &nxt, false);
+ ret = __io_submit_sqe(ctx, req, &nxt, false);
/*
* We can get EAGAIN for polled IO even though we're
* forcing a sync submission from here, since we can't
@@ -2372,9 +2371,10 @@ static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
return table->files[index & IORING_FILE_TABLE_MASK];
}
-static int io_req_set_file(struct io_ring_ctx *ctx, const struct sqe_submit *s,
+static int io_req_set_file(struct io_ring_ctx *ctx,
struct io_submit_state *state, struct io_kiocb *req)
{
+ struct sqe_submit *s = &req->submit;
unsigned flags;
int fd;
@@ -2438,12 +2438,11 @@ static int io_grab_files(struct io_ring_ctx *ctx, struct io_kiocb *req)
return ret;
}
-static int __io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
- struct sqe_submit *s)
+static int __io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req)
{
int ret;
- ret = __io_submit_sqe(ctx, req, s, NULL, true);
+ ret = __io_submit_sqe(ctx, req, NULL, true);
/*
* We async punt it if the file wasn't marked NOWAIT, or if the file
@@ -2451,6 +2450,7 @@ static int __io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
*/
if (ret == -EAGAIN && (!(req->flags & REQ_F_NOWAIT) ||
(req->flags & REQ_F_MUST_PUNT))) {
+ struct sqe_submit *s = &req->submit;
struct io_uring_sqe *sqe_copy;
sqe_copy = kmemdup(s->sqe, sizeof(*sqe_copy), GFP_KERNEL);
@@ -2488,31 +2488,30 @@ static int __io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
return ret;
}
-static int io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
- struct sqe_submit *s)
+static int io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req)
{
int ret;
- ret = io_req_defer(ctx, req, s->sqe);
+ ret = io_req_defer(ctx, req);
if (ret) {
if (ret != -EIOCBQUEUED) {
+ io_cqring_add_event(ctx, req->submit.sqe->user_data, ret);
io_free_req(req, NULL);
- io_cqring_add_event(ctx, s->sqe->user_data, ret);
}
return 0;
}
- return __io_queue_sqe(ctx, req, s);
+ return __io_queue_sqe(ctx, req);
}
static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
- struct sqe_submit *s, struct io_kiocb *shadow)
+ struct io_kiocb *shadow)
{
int ret;
int need_submit = false;
if (!shadow)
- return io_queue_sqe(ctx, req, s);
+ return io_queue_sqe(ctx, req);
/*
* Mark the first IO in link list as DRAIN, let all the following
@@ -2520,12 +2519,12 @@ static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
* list.
*/
req->flags |= REQ_F_IO_DRAIN;
- ret = io_req_defer(ctx, req, s->sqe);
+ ret = io_req_defer(ctx, req);
if (ret) {
if (ret != -EIOCBQUEUED) {
+ io_cqring_add_event(ctx, req->submit.sqe->user_data, ret);
io_free_req(req, NULL);
__io_free_req(shadow);
- io_cqring_add_event(ctx, s->sqe->user_data, ret);
return 0;
}
} else {
@@ -2543,7 +2542,7 @@ static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
spin_unlock_irq(&ctx->completion_lock);
if (need_submit)
- return __io_queue_sqe(ctx, req, s);
+ return __io_queue_sqe(ctx, req);
return 0;
}
@@ -2551,10 +2550,10 @@ static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK)
static void io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
- struct sqe_submit *s, struct io_submit_state *state,
- struct io_kiocb **link)
+ struct io_submit_state *state, struct io_kiocb **link)
{
struct io_uring_sqe *sqe_copy;
+ struct sqe_submit *s = &req->submit;
int ret;
/* enforce forwards compatibility on users */
@@ -2563,11 +2562,11 @@ static void io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
goto err_req;
}
- ret = io_req_set_file(ctx, s, state, req);
+ ret = io_req_set_file(ctx, state, req);
if (unlikely(ret)) {
err_req:
- io_free_req(req, NULL);
io_cqring_add_event(ctx, s->sqe->user_data, ret);
+ io_free_req(req, NULL);
return;
}
@@ -2598,7 +2597,7 @@ static void io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
INIT_LIST_HEAD(&req->link_list);
*link = req;
} else {
- io_queue_sqe(ctx, req, s);
+ io_queue_sqe(ctx, req);
}
}
@@ -2739,7 +2738,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
req->submit.needs_fixed_file = async;
trace_io_uring_submit_sqe(ctx, req->submit.sqe->user_data,
true, async);
- io_submit_sqe(ctx, req, &req->submit, statep, &link);
+ io_submit_sqe(ctx, req, statep, &link);
submitted++;
/*
@@ -2747,14 +2746,14 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
* that's the end of the chain. Submit the previous link.
*/
if (!(sqe_flags & IOSQE_IO_LINK) && link) {
- io_queue_link_head(ctx, link, &link->submit, shadow_req);
+ io_queue_link_head(ctx, link, shadow_req);
link = NULL;
shadow_req = NULL;
}
}
if (link)
- io_queue_link_head(ctx, link, &link->submit, shadow_req);
+ io_queue_link_head(ctx, link, shadow_req);
if (statep)
io_submit_state_end(&state);
--
2.23.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v3 0/3] Inline sqe_submit
2019-11-06 22:41 [PATCH v3 0/3] Inline sqe_submit Pavel Begunkov
` (2 preceding siblings ...)
2019-11-06 22:41 ` [PATCH v3 3/3] io_uring: use inlined struct sqe_submit Pavel Begunkov
@ 2019-11-06 22:47 ` Jens Axboe
3 siblings, 0 replies; 6+ messages in thread
From: Jens Axboe @ 2019-11-06 22:47 UTC (permalink / raw)
To: Pavel Begunkov, io-uring, linux-block
On 11/6/19 3:41 PM, Pavel Begunkov wrote:
> The idea is to not pass struct sqe_submit as a separate entity,
> but always use req->submit instead, so there will be less stuff to
> care about.
>
> Also, I've got steady +1% throughput improvement for nop tests.
> Though, it's highly system-dependent, and I wouldn't count on it.
>
> v2: fix use-after-free catched by Jens
>
> v3: -EAGAIN, in case submission failed
>
> Pavel Begunkov (3):
> io_uring: allocate io_kiocb upfront
> io_uring: Use submit info inlined into req
> io_uring: use inlined struct sqe_submit
>
> fs/io_uring.c | 134 +++++++++++++++++++++++++-------------------------
> 1 file changed, 67 insertions(+), 67 deletions(-)
This looks good to me now, thanks! Applied.
--
Jens Axboe
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v3 1/3] io_uring: allocate io_kiocb upfront
2019-11-06 22:41 ` [PATCH v3 1/3] io_uring: allocate io_kiocb upfront Pavel Begunkov
@ 2019-11-06 22:47 ` Pavel Begunkov
0 siblings, 0 replies; 6+ messages in thread
From: Pavel Begunkov @ 2019-11-06 22:47 UTC (permalink / raw)
To: Jens Axboe, io-uring, linux-block
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On 07/11/2019 01:41, Pavel Begunkov wrote:
> Let io_submit_sqes() to allocate io_kiocb before fetching an sqe.
>
> Signed-off-by: Pavel Begunkov <[email protected]>
> ---
> fs/io_uring.c | 27 ++++++++++++++-------------
> 1 file changed, 14 insertions(+), 13 deletions(-)
>
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 6524898831e0..ceb616dbe710 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -2551,30 +2551,23 @@ static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
>
> #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK)
>
> -static void io_submit_sqe(struct io_ring_ctx *ctx, struct sqe_submit *s,
> - struct io_submit_state *state, struct io_kiocb **link)
> +static void io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
> + struct sqe_submit *s, struct io_submit_state *state,
> + struct io_kiocb **link)
> {
> struct io_uring_sqe *sqe_copy;
> - struct io_kiocb *req;
> int ret;
>
> /* enforce forwards compatibility on users */
> if (unlikely(s->sqe->flags & ~SQE_VALID_FLAGS)) {
> ret = -EINVAL;
> - goto err;
> - }
> -
> - req = io_get_req(ctx, state);
> - if (unlikely(!req)) {
> - ret = -EAGAIN;
> - goto err;
> + goto err_req;
> }
>
> ret = io_req_set_file(ctx, s, state, req);
> if (unlikely(ret)) {
> err_req:
> io_free_req(req, NULL);
> -err:
> io_cqring_add_event(ctx, s->sqe->user_data, ret);
> return;
> }
> @@ -2710,9 +2703,15 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
>
> for (i = 0; i < nr; i++) {
> struct sqe_submit s;
> + struct io_kiocb *req;
>
> - if (!io_get_sqring(ctx, &s))
> + req = io_get_req(ctx, statep);
> + if (unlikely(!req))
> break;
> + if (!io_get_sqring(ctx, &s)) {
> + __io_free_req(req);
> + break;
> + }
>
> if (io_sqe_needs_user(s.sqe) && !*mm) {
> mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm);
> @@ -2740,7 +2739,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
> s.in_async = async;
> s.needs_fixed_file = async;
> trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, async);
> - io_submit_sqe(ctx, &s, statep, &link);
> + io_submit_sqe(ctx, req, &s, statep, &link);
> submitted++;
>
> /*
> @@ -4009,6 +4008,8 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
> cur_mm = ctx->sqo_mm;
> submitted = io_submit_sqes(ctx, to_submit, f.file, fd,
> &cur_mm, false);
> + if (!submitted)
> + submitted = -EAGAIN;
Need to say, that left io_submit_sqes() errors of more priority than ones of
poll/wait.
> mutex_unlock(&ctx->uring_lock);
> }
> if (flags & IORING_ENTER_GETEVENTS) {
>
--
Pavel Begunkov
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^ permalink raw reply [flat|nested] 6+ messages in thread
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Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2019-11-06 22:41 [PATCH v3 0/3] Inline sqe_submit Pavel Begunkov
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2019-11-06 22:47 ` Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 2/3] io_uring: Use submit info inlined into req Pavel Begunkov
2019-11-06 22:41 ` [PATCH v3 3/3] io_uring: use inlined struct sqe_submit Pavel Begunkov
2019-11-06 22:47 ` [PATCH v3 0/3] Inline sqe_submit Jens Axboe
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