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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 5/6] io_uring: consolidate *_check_overflow accounting
Date: Thu, 30 Jul 2020 18:43:49 +0300	[thread overview]
Message-ID: <4a5758ed5a2a94408fa96beed2984772279e603d.1596123376.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

Add a helper to mark ctx->{cq,sq}_check_overflow to get rid of
duplicates, and it's clearer to check cq_overflow_list directly anyway.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 11c1abe8bd1a..efec290c6b08 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1303,6 +1303,15 @@ static void io_cqring_ev_posted(struct io_ring_ctx *ctx)
 		eventfd_signal(ctx->cq_ev_fd, 1);
 }
 
+static void io_cqring_mark_overflow(struct io_ring_ctx *ctx)
+{
+	if (list_empty(&ctx->cq_overflow_list)) {
+		clear_bit(0, &ctx->sq_check_overflow);
+		clear_bit(0, &ctx->cq_check_overflow);
+		ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
+	}
+}
+
 /* Returns true if there are no backlogged entries after the flush */
 static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
 {
@@ -1347,11 +1356,8 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
 	}
 
 	io_commit_cqring(ctx);
-	if (cqe) {
-		clear_bit(0, &ctx->sq_check_overflow);
-		clear_bit(0, &ctx->cq_check_overflow);
-		ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
-	}
+	io_cqring_mark_overflow(ctx);
+
 	spin_unlock_irqrestore(&ctx->completion_lock, flags);
 	io_cqring_ev_posted(ctx);
 
@@ -7842,11 +7848,8 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
 			spin_lock_irq(&ctx->completion_lock);
 			list_del(&cancel_req->compl.list);
 			cancel_req->flags &= ~REQ_F_OVERFLOW;
-			if (list_empty(&ctx->cq_overflow_list)) {
-				clear_bit(0, &ctx->sq_check_overflow);
-				clear_bit(0, &ctx->cq_check_overflow);
-				ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
-			}
+
+			io_cqring_mark_overflow(ctx);
 			WRITE_ONCE(ctx->rings->cq_overflow,
 				atomic_inc_return(&ctx->cached_cq_overflow));
 			io_commit_cqring(ctx);
-- 
2.24.0


  parent reply	other threads:[~2020-07-30 15:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30 15:43 [PATCH 0/6] 5.9 small cleanups/fixes Pavel Begunkov
2020-07-30 15:43 ` [PATCH 1/6] io_uring: de-unionise io_kiocb Pavel Begunkov
2020-07-30 15:43 ` [PATCH 2/6] io_uring: deduplicate __io_complete_rw() Pavel Begunkov
2020-07-30 15:43 ` [PATCH 3/6] io_uring: fix racy overflow count reporting Pavel Begunkov
2020-07-30 17:18   ` Jens Axboe
2020-07-30 17:33     ` Pavel Begunkov
2020-07-30 17:41       ` Jens Axboe
2020-07-30 15:43 ` [PATCH 4/6] io_uring: fix stalled deferred requests Pavel Begunkov
2020-07-30 15:43 ` Pavel Begunkov [this message]
2020-07-30 15:43 ` [PATCH 6/6] io_uring: get rid of atomic FAA for cq_timeouts Pavel Begunkov
2020-07-30 18:08 ` [PATCH 0/6] 5.9 small cleanups/fixes Jens Axboe
2020-07-31 14:28   ` Pavel Begunkov
2020-07-31 15:10     ` Jens Axboe

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