SUNRPC: add sending,pending queue and max slot to xprt stats

With static RPC slots, the xprt backlog queue stats were useful in showing
when the transport (TCP) was starved by lack of RPC slots. The new dynamic
RPC slot code, commit d9ba131d8f58c0d2ff5029e7002ab43f913b36f9, always
provides an RPC slot and so only uses the xprt backlog queue when the
tcp_max_slot_table_entries value has been hit or when an allocation error
occurs. All requests are now placed on the xprt sending or pending queue which
need to be monitored for debugging.

The max_slot stat shows the maximum number of dynamic RPC slots reached which is
useful when debugging performance issues.

Add the new fields at the end of the mountstats xprt stanza so that mountstats
outputs the previous correct values and ignores the new fields. Bump
NFS_IOSTATS_VERS.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index b033f366d5f6..ea712f97f4a1 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -219,10 +219,13 @@ struct rpc_xprt {
                                         connect_time,   /* jiffies waiting for connect */
                                         sends,          /* how many complete requests */
                                         recvs,          /* how many complete requests */
-                                        bad_xids;       /* lookup_rqst didn't find XID */
+                                        bad_xids,       /* lookup_rqst didn't find XID */
+                                        max_slots;      /* max rpc_slots used */
 
                 unsigned long long      req_u,          /* average requests on the wire */
-                                        bklog_u;        /* backlog queue utilization */
+                                        bklog_u,        /* backlog queue utilization */
+                                        sending_u,      /* send q utilization */
+                                        pending_u;      /* pend q utilization */
         } stat;
 
         struct net              *xprt_net;