SUNRPC: introduce per-task RPC iostats

Account for various things that occur while an RPC task is executed.
Separate timers for RPC round trip and RPC execution time show how
long RPC requests wait in queue before being sent.  Eventually these
will be accumulated at xprt_release time in one place where they can
be viewed from userland.

Test plan:
Compile kernel with CONFIG_NFS enabled.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 6766b7f1ecf9..4b4e7dfdff14 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -382,6 +382,7 @@ static int xs_tcp_send_request(struct rpc_task *task)
                 /* If we've sent the entire packet, immediately
                  * reset the count of bytes sent. */
                 req->rq_bytes_sent += status;
+                task->tk_bytes_sent += status;
                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
                         req->rq_bytes_sent = 0;
                         return 0;