* [PATCH] io_uring: remove extra check in __io_commit_cqring
@ 2020-01-17 0:52 Pavel Begunkov
2020-01-17 2:59 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Begunkov @ 2020-01-17 0:52 UTC (permalink / raw)
To: Jens Axboe, io-uring, linux-kernel
__io_commit_cqring() is almost always called when there is a change in
the rings, so the check is rather pessimising.
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index f9709a3a673c..ea91f4d92fc0 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -859,14 +859,12 @@ static void __io_commit_cqring(struct io_ring_ctx *ctx)
{
struct io_rings *rings = ctx->rings;
- if (ctx->cached_cq_tail != READ_ONCE(rings->cq.tail)) {
- /* order cqe stores with ring update */
- smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
+ /* order cqe stores with ring update */
+ smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
- if (wq_has_sleeper(&ctx->cq_wait)) {
- wake_up_interruptible(&ctx->cq_wait);
- kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
- }
+ if (wq_has_sleeper(&ctx->cq_wait)) {
+ wake_up_interruptible(&ctx->cq_wait);
+ kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
}
}
--
2.24.0
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2020-01-17 0:52 [PATCH] io_uring: remove extra check in __io_commit_cqring Pavel Begunkov
2020-01-17 2:59 ` Jens Axboe
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