SUNRPC: Reduce latency when send queue is congested

Use the low latency transport workqueue to process the task that is
next in line on the xprt->sending queue.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index ef780b3b5e31..817af0b4385e 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -230,6 +230,10 @@ void		rpc_wake_up_queued_task(struct rpc_wait_queue *,
                                         struct rpc_task *);
 void            rpc_wake_up(struct rpc_wait_queue *);
 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
+struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
+                                        struct rpc_wait_queue *,
+                                        bool (*)(struct rpc_task *, void *),
+                                        void *);
 struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *,
                                         bool (*)(struct rpc_task *, void *),
                                         void *);