Commit ef759a2e authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

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: default avatarChuck Lever <cel@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 262ca07d

include/linux/sunrpc/sched.h

+6 −0
Original line number Diff line number Diff line
@@ -86,6 +86,12 @@ struct rpc_task { 
		struct work_struct	tk_work;	/* Async task work queue */

		struct rpc_wait		tk_wait;	/* RPC wait */

	} u;



	unsigned short		tk_timeouts;	/* maj timeouts */

	size_t			tk_bytes_sent;	/* total bytes sent */

	unsigned long		tk_start;	/* RPC task init timestamp */

	long			tk_rtt;		/* round-trip time (jiffies) */



#ifdef RPC_DEBUG

	unsigned short		tk_pid;		/* debugging aid */

#endif

net/sunrpc/clnt.c

+2 −0
Original line number Diff line number Diff line
@@ -996,6 +996,8 @@ call_timeout(struct rpc_task *task) 
	}



	dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);

	task->tk_timeouts++;



	if (RPC_IS_SOFT(task)) {

		printk(KERN_NOTICE "%s: server %s not responding, timed out\n",

				clnt->cl_protname, clnt->cl_server);

net/sunrpc/sched.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

}

net/sunrpc/xprt.c

+2 −0
Original line number Diff line number Diff line
@@ -648,6 +648,8 @@ void xprt_complete_rqst(struct rpc_task *task, int copied) 
			task->tk_pid, ntohl(req->rq_xid), copied);



	task->tk_xprt->stat.recvs++;

	task->tk_rtt = (long)jiffies - req->rq_xtime;



	list_del_init(&req->rq_list);

	req->rq_received = req->rq_private_buf.len = copied;

	rpc_wake_up_task(task);

net/sunrpc/xprtsock.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

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