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, 3 insertions, 0 deletions

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index aa0449dcd8e5..cd51b5468332 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -817,6 +817,9 @@ void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, cons
 
         BUG_ON(task->tk_ops == NULL);
 
+        /* starting timestamp */
+        task->tk_start = jiffies;
+
         dprintk("RPC: %4d new task procpid %d\n", task->tk_pid,
                                 current->pid);
 }