From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>, [email protected]
Subject: [RFC v2 08/13] io_uring: set TASK_RUNNING right after schedule
Date: Tue, 3 Jan 2023 03:03:59 +0000 [thread overview]
Message-ID: <590f0b0e2fa5529e975f3f3ecbb588ff7e67e9c5.1672713341.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
Instead of constantly watching that the state of the task is running
before executing tw or taking locks in io_cqring_wait(), switch it back
to TASK_RUNNING immediately.
Signed-off-by: Pavel Begunkov <[email protected]>
---
io_uring/io_uring.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index a8d3826f3d17..682f4b086f09 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2541,6 +2541,7 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
ret = io_cqring_wait_schedule(ctx, &iowq, timeout);
if (ret < 0)
break;
+ __set_current_state(TASK_RUNNING);
/*
* Run task_work after scheduling and before io_should_wake().
* If we got woken because of task_work being processed, run it
@@ -2553,10 +2554,8 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
check_cq = READ_ONCE(ctx->check_cq);
if (unlikely(check_cq)) {
/* let the caller flush overflows, retry */
- if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT)) {
- finish_wait(&ctx->cq_wait, &iowq.wq);
+ if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT))
io_cqring_do_overflow_flush(ctx);
- }
if (check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT)) {
ret = -EBADR;
break;
--
2.38.1
next prev parent reply other threads:[~2023-01-03 3:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-03 3:03 [RFC v2 00/13] CQ waiting and wake up optimisations Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 01/13] io_uring: rearrange defer list checks Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 02/13] io_uring: don't iterate cq wait fast path Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 03/13] io_uring: kill io_run_task_work_ctx Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 04/13] io_uring: move defer tw task checks Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 05/13] io_uring: parse check_cq out of wq waiting Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 06/13] io_uring: mimimise io_cqring_wait_schedule Pavel Begunkov
2023-01-03 3:03 ` [RFC v2 07/13] io_uring: simplify io_has_work Pavel Begunkov
2023-01-03 3:03 ` Pavel Begunkov [this message]
2023-01-03 3:04 ` [RFC v2 09/13] io_uring: separate wq for ring polling Pavel Begunkov
2023-01-04 18:08 ` Jens Axboe
2023-01-04 20:28 ` Pavel Begunkov
2023-01-04 20:34 ` Jens Axboe
2023-01-04 20:45 ` Pavel Begunkov
2023-01-04 20:53 ` Jens Axboe
2023-01-04 20:52 ` Jens Axboe
2023-01-03 3:04 ` [RFC v2 10/13] io_uring: add lazy poll_wq activation Pavel Begunkov
2023-01-03 3:04 ` [RFC v2 11/13] io_uring: wake up optimisations Pavel Begunkov
2023-01-03 3:04 ` [RFC v2 12/13] io_uring: waitqueue-less cq waiting Pavel Begunkov
2023-01-03 3:04 ` [RFC v2 13/13] io_uring: add io_req_local_work_add wake fast path Pavel Begunkov
2023-01-04 18:05 ` (subset) [RFC v2 00/13] CQ waiting and wake up optimisations Jens Axboe
2023-01-04 20:25 ` Pavel Begunkov
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