rxrpc: Record stats for why the REQUEST-ACK flag is being set

Record stats for why the REQUEST-ACK flag is being set.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index a72f04e..794523d 100644 (file)
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -250,6 +250,7 @@
        EM(rxrpc_reqack_retrans,                "RETRANS   ")   \
        EM(rxrpc_reqack_slow_start,             "SLOW-START")   \
        E_(rxrpc_reqack_small_txwin,            "SMALL-TXWN")
+/* ---- Must update size of stat_why_req_ack[] if more are added! */
 
 /*
  * Generate enums for tracing information.

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 8ed707a..436a1e8 100644 (file)
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -107,6 +107,8 @@ struct rxrpc_net {
        atomic_t                stat_tx_ack_skip;
        atomic_t                stat_tx_acks[256];
        atomic_t                stat_rx_acks[256];
+
+       atomic_t                stat_why_req_ack[8];
 };
 
 /*

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index f350d39..77ed46a 100644 (file)
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -430,6 +430,7 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
        else
                goto dont_set_request_ack;
 
+       rxrpc_inc_stat(call->rxnet, stat_why_req_ack[why]);
        trace_rxrpc_req_ack(call->debug_id, sp->hdr.seq, why);
        if (why != rxrpc_reqack_no_srv_last)
                whdr.flags |= RXRPC_REQUEST_ACK;

diff --git a/net/rxrpc/proc.c b/net/rxrpc/proc.c
index 488c403..9bd357f 100644 (file)
--- a/net/rxrpc/proc.c
+++ b/net/rxrpc/proc.c
@@ -446,6 +446,18 @@ int rxrpc_stats_show(struct seq_file *seq, void *v)
                   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_DELAY]),
                   atomic_read(&rxnet->stat_rx_acks[RXRPC_ACK_IDLE]));
        seq_printf(seq,
+                  "Why-Req-A: acklost=%u already=%u mrtt=%u ortt=%u\n",
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_ack_lost]),
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_already_on]),
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_more_rtt]),
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_old_rtt]));
+       seq_printf(seq,
+                  "Why-Req-A: nolast=%u retx=%u slows=%u smtxw=%u\n",
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_no_srv_last]),
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_retrans]),
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_slow_start]),
+                  atomic_read(&rxnet->stat_why_req_ack[rxrpc_reqack_small_txwin]));
+       seq_printf(seq,
                   "Buffers  : txb=%u rxb=%u\n",
                   atomic_read(&rxrpc_n_tx_skbs),
                   atomic_read(&rxrpc_n_rx_skbs));
@@ -476,5 +488,7 @@ int rxrpc_stats_clear(struct file *file, char *buf, size_t size)
        atomic_set(&rxnet->stat_tx_ack_skip, 0);
        memset(&rxnet->stat_tx_acks, 0, sizeof(rxnet->stat_tx_acks));
        memset(&rxnet->stat_rx_acks, 0, sizeof(rxnet->stat_rx_acks));
+
+       memset(&rxnet->stat_why_req_ack, 0, sizeof(rxnet->stat_why_req_ack));
        return size;
 }