From 692cf47e1af39f86f28069db5ca6b00a7d2daddc Mon Sep 17 00:00:00 2001 From: Caleb Sander Mateos Date: Wed, 17 Sep 2025 19:49:44 -0600 Subject: [PATCH] ublk: don't access ublk_queue in ublk_register_io_buf() For ublk servers with many ublk queues, accessing the ublk_queue in ublk_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 cb51f3f3cd33..751ec62655f8 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2133,7 +2133,7 @@ static int ublk_register_io_buf(struct io_uring_cmd *cmd, struct request *req; int ret; - if (!ublk_support_zero_copy(ubq)) + if (!ublk_dev_support_zero_copy(ub)) return -EINVAL; req = __ublk_check_and_get_req(ub, ubq, io, 0); -- 2.51.0