From ce88e3ef33d35c740d26342be5d8f65972fd5597 Mon Sep 17 00:00:00 2001 From: Caleb Sander Mateos Date: Wed, 17 Sep 2025 19:49:45 -0600 Subject: [PATCH] ublk: don't access ublk_queue in ublk_daemon_register_io_buf() For ublk servers with many ublk queues, accessing the ublk_queue in ublk_daemon_register_io_buf() is a frequent cache miss. Get the flags from the ublk_device instead, which is accessed earlier in ublk_ch_uring_cmd_local(). Signed-off-by: Caleb Sander Mateos Reviewed-by: Ming Lei Signed-off-by: Jens Axboe --- drivers/block/ublk_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 751ec62655f8..266b46d40886 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2169,7 +2169,7 @@ ublk_daemon_register_io_buf(struct io_uring_cmd *cmd, return ublk_register_io_buf(cmd, ub, ubq, io, index, issue_flags); - if (!ublk_support_zero_copy(ubq) || !ublk_rq_has_data(req)) + if (!ublk_dev_support_zero_copy(ub) || !ublk_rq_has_data(req)) return -EINVAL; ret = io_buffer_register_bvec(cmd, req, ublk_io_release, index, -- 2.51.0