SUNRPC: Display RPC procedure names instead of proc numbers

Make the sunrpc trace subsystem trace events easier to use.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

include/trace/events/sunrpc.h

@@ -1603,6 +1603,7 @@ TRACE_EVENT(svc_process,
 		__field(u32, vers)
 		__field(u32, proc)
 		__string(service, name)
+		__string(procedure, rqst->rq_procinfo->pc_name)
 		__string(addr, rqst->rq_xprt ?
 			 rqst->rq_xprt->xpt_remotebuf : "(null)")
 	),
@@ -1612,13 +1613,16 @@ TRACE_EVENT(svc_process,
 		__entry->vers = rqst->rq_vers;
 		__entry->proc = rqst->rq_proc;
 		__assign_str(service, name);
+		__assign_str(procedure, rqst->rq_procinfo->pc_name);
 		__assign_str(addr, rqst->rq_xprt ?
 			     rqst->rq_xprt->xpt_remotebuf : "(null)");
 	),
 
-	TP_printk("addr=%s xid=0x%08x service=%s vers=%u proc=%u",
+	TP_printk("addr=%s xid=0x%08x service=%s vers=%u proc=%s",
 			__get_str(addr), __entry->xid,
-			__get_str(service), __entry->vers, __entry->proc)
+			__get_str(service), __entry->vers,
+			__get_str(procedure)
+	)
 );
 
 DECLARE_EVENT_CLASS(svc_rqst_event,
@@ -1874,6 +1878,7 @@ TRACE_EVENT(svc_stats_latency,
 	TP_STRUCT__entry(
 		__field(u32, xid)
 		__field(unsigned long, execute)
+		__string(procedure, rqst->rq_procinfo->pc_name)
 		__string(addr, rqst->rq_xprt->xpt_remotebuf)
 	),
 
@@ -1881,11 +1886,13 @@ TRACE_EVENT(svc_stats_latency,
 		__entry->xid = be32_to_cpu(rqst->rq_xid);
 		__entry->execute = ktime_to_us(ktime_sub(ktime_get(),
 							 rqst->rq_stime));
+		__assign_str(procedure, rqst->rq_procinfo->pc_name);
 		__assign_str(addr, rqst->rq_xprt->xpt_remotebuf);
 	),
 
-	TP_printk("addr=%s xid=0x%08x execute-us=%lu",
-		__get_str(addr), __entry->xid, __entry->execute)
+	TP_printk("addr=%s xid=0x%08x proc=%s execute-us=%lu",
+		__get_str(addr), __entry->xid, __get_str(procedure),
+		__entry->execute)
 );
 
 DECLARE_EVENT_CLASS(svc_deferred_event,