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io_uring: add io_req_local_work_add wake fast path

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Don't wake the master task after queueing a deferred tw unless it's
currently waiting in io_cqring_wait.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/717702d772825a6647e6c315b4690277ba84c3fc.1673274244.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-01-09 14:46:12 +00:00 committed by Jens Axboe
parent 130bd686d9
commit d80c0f00d0
2 changed files with 7 additions and 1 deletions
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1
include/linux/io_uring_types.h
View File

@ -295,6 +295,7 @@ struct io_ring_ctx {
spinlock_t completion_lock;
bool poll_multi_queue;
bool cq_waiting;
/*
* ->iopoll_list is protected by the ctx->uring_lock for

7
io_uring/io_uring.c
View File

@ -1276,7 +1276,9 @@ static void io_req_local_work_add(struct io_kiocb *req)
atomic_or(IORING_SQ_TASKRUN, &ctx->rings->sq_flags);
if (ctx->has_evfd)
io_eventfd_signal(ctx);
wake_up_state(ctx->submitter_task, TASK_INTERRUPTIBLE);
if (READ_ONCE(ctx->cq_waiting))
wake_up_state(ctx->submitter_task, TASK_INTERRUPTIBLE);
percpu_ref_put(&ctx->refs);
}
@ -2576,6 +2578,7 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
unsigned long check_cq;
if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
WRITE_ONCE(ctx->cq_waiting, 1);
set_current_state(TASK_INTERRUPTIBLE);
} else {
prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq,
@ -2584,6 +2587,8 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
ret = io_cqring_wait_schedule(ctx, &iowq);
__set_current_state(TASK_RUNNING);
WRITE_ONCE(ctx->cq_waiting, 0);
if (ret < 0)
break;
/*