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| author |  Pavel Begunkov <asml.silence@gmail.com>
| 2023-08-24 23:53:28 +0100 |
|---|---|---|
| committer |  Jens Axboe <axboe@kernel.dk>
| 2023-08-24 17:16:19 -0600 |
| commit | 54927baf6c195fb512ac38b26a041ca44edb2e29 (patch) | |
| tree | 307d65ad73c558573ccc084c71dcb60e8c2d269d /io_uring/io_uring.c | |
| parent | io_uring: optimise extra io_get_cqe null check (diff) | |
| download | linux-54927baf6c195fb512ac38b26a041ca44edb2e29.tar.gz linux-54927baf6c195fb512ac38b26a041ca44edb2e29.tar.bz2 linux-54927baf6c195fb512ac38b26a041ca44edb2e29.zip | |
io_uring: reorder cqring_flush and wakeups
Unlike in the past, io_commit_cqring_flush() doesn't do anything that
may need io_cqring_wake() to be issued after, all requests it completes
will go via task_work. Do io_commit_cqring_flush() after
io_cqring_wake() to clean up __io_cq_unlock_post().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ed32dcfeec47e6c97bd6b18c152ddce5b218403f.1692916914.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/io_uring.c')
| -rw-r--r-- | io_uring/io_uring.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index cfc2dc8c4b2f..7c1ef5b6628d 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -629,19 +629,11 @@ static inline void io_cq_lock(struct io_ring_ctx *ctx) static inline void __io_cq_unlock_post(struct io_ring_ctx *ctx) { io_commit_cqring(ctx); - - if (ctx->task_complete) { - /* - * ->task_complete implies that only current might be waiting - * for CQEs, and obviously, we currently don't. No one is - * waiting, wakeups are futile, skip them. - */ - io_commit_cqring_flush(ctx); - } else { + if (!ctx->task_complete) { spin_unlock(&ctx->completion_lock); - io_commit_cqring_flush(ctx); io_cqring_wake(ctx); } + io_commit_cqring_flush(ctx); } static void io_cq_unlock_post(struct io_ring_ctx *ctx) @@ -649,8 +641,8 @@ static void io_cq_unlock_post(struct io_ring_ctx *ctx) { io_commit_cqring(ctx); spin_unlock(&ctx->completion_lock); - io_commit_cqring_flush(ctx); io_cqring_wake(ctx); + io_commit_cqring_flush(ctx); } /* Returns true if there are no backlogged entries after the flush */ |