linux-kernel - [PATCH 3/5] io_uring: batch free in batched completion

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Date:   Tue, 14 Jul 2020 02:41:54 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] io_uring: batch free in batched completion

io_submit_flush_completions() already does batching, hence also bundle
freeing reusing batch_free from iopoll.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3277a06e2fb6..6f767781351f 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1795,6 +1795,7 @@ static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req)
 
 static void io_submit_flush_completions(struct io_comp_state *cs)
 {
+	struct req_batch rb;
 	struct io_kiocb *req;
 	struct io_ring_ctx *ctx = cs->ctx;
 	int i, nr = cs->nr;
@@ -1808,8 +1809,13 @@ static void io_submit_flush_completions(struct io_comp_state *cs)
 	spin_unlock_irq(&ctx->completion_lock);
 	io_cqring_ev_posted(ctx);
 
-	for (i = 0; i < nr; ++i)
-		io_put_req(cs->reqs[i]);
+	rb.to_free = 0;
+	for (i = 0; i < nr; ++i) {
+		req = cs->reqs[i];
+		if (refcount_dec_and_test(&req->refs))
+			io_req_free_batch(&rb, req);
+	}
+	io_req_free_batch_finish(ctx, &rb);
 	cs->nr = 0;
 }
 
-- 
2.24.0