From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 18 Jun 2025 12:44:03 +0000 (-0600)
Subject: io_uring/fdinfo: add some defer tw ring debugging
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=refs%2Fheads%2Fio_uring-defer-tw.4;p=linux-block.git

io_uring/fdinfo: add some defer tw ring debugging

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
index 9798d6fb4ec7..266366a244f4 100644
--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -202,6 +202,16 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
 					task_work_pending(req->tctx->task));
 	}
 
+	if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
+		struct io_tw_ring *tw_ring = ctx->tw_ring;
+
+		seq_printf(m, "Defer ring\n");
+		seq_printf(m, "  Entries: %u\n", tw_ring->entries);
+		seq_printf(m, "  Head   : %u\n", tw_ring->head);
+		seq_printf(m, "  CTail  : %u\n", atomic_read(&tw_ring->cons_tail));
+		seq_printf(m, "  TTail  : %u\n", atomic_read(&tw_ring->prod_tail));
+	}
+
 	seq_puts(m, "CqOverflowList:\n");
 	spin_lock(&ctx->completion_lock);
 	list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) {