linux-kernel - [PATCH 2/6] io_uring: trace cqe overflows

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Message-ID: <20220421091345.2115755-3-dylany@fb.com>
Date:   Thu, 21 Apr 2022 02:13:41 -0700
From:   Dylan Yudaken <dylany@...com>
To:     <io-uring@...r.kernel.org>
CC:     <axboe@...nel.dk>, <asml.silence@...il.com>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>,
        Dylan Yudaken <dylany@...com>
Subject: [PATCH 2/6] io_uring: trace cqe overflows

Trace cqe overflows in io_uring. Print ocqe before the check, so if it is
NULL it indicates that it has been dropped.

Signed-off-by: Dylan Yudaken <dylany@...com>
---
 fs/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7e1d5243bbbc..d654faffa486 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2107,6 +2107,7 @@ static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
 	struct io_overflow_cqe *ocqe;
 
 	ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT);
+	trace_io_uring_cqe_overflow(ctx, user_data, res, cflags, ocqe);
 	if (!ocqe) {
 		/*
 		 * If we're in ring overflow flush mode, or in task cancel mode,
-- 
2.30.2