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rxrpc: Add per-peer RTT tracker

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Add a function to track the average RTT for a peer.  Sources of RTT data
will be added in subsequent patches.

The RTT data will be useful in the future for determining resend timeouts
and for handling the slow-start part of the Rx protocol.

Also add a pair of tracepoints, one to log transmissions to elicit a
response for RTT purposes and one to log responses that contribute RTT
data.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2016-09-22 00:41:53 +01:00
parent f07373ead4
commit cf1a6474f8
4 changed files with 131 additions and 4 deletions
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61
include/trace/events/rxrpc.h
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@@ -353,6 +353,67 @@ TRACE_EVENT(rxrpc_recvmsg,
__entry->ret)
);
TRACE_EVENT(rxrpc_rtt_tx,
TP_PROTO(struct rxrpc_call *call, enum rxrpc_rtt_tx_trace why,
rxrpc_serial_t send_serial),
TP_ARGS(call, why, send_serial),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(enum rxrpc_rtt_tx_trace, why )
__field(rxrpc_serial_t, send_serial )
),
TP_fast_assign(
__entry->call = call;
__entry->why = why;
__entry->send_serial = send_serial;
),
TP_printk("c=%p %s sr=%08x",
__entry->call,
rxrpc_rtt_tx_traces[__entry->why],
__entry->send_serial)
);
TRACE_EVENT(rxrpc_rtt_rx,
TP_PROTO(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
s64 rtt, u8 nr, s64 avg),
TP_ARGS(call, why, send_serial, resp_serial, rtt, nr, avg),
TP_STRUCT__entry(
__field(struct rxrpc_call *, call )
__field(enum rxrpc_rtt_rx_trace, why )
__field(u8, nr )
__field(rxrpc_serial_t, send_serial )
__field(rxrpc_serial_t, resp_serial )
__field(s64, rtt )
__field(u64, avg )
),
TP_fast_assign(
__entry->call = call;
__entry->why = why;
__entry->send_serial = send_serial;
__entry->resp_serial = resp_serial;
__entry->rtt = rtt;
__entry->nr = nr;
__entry->avg = avg;
),
TP_printk("c=%p %s sr=%08x rr=%08x rtt=%lld nr=%u avg=%lld",
__entry->call,
rxrpc_rtt_rx_traces[__entry->why],
__entry->send_serial,
__entry->resp_serial,
__entry->rtt,
__entry->nr,
__entry->avg)
);
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */