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Message-ID: <147464379347.5090.13751863428044452562.stgit@warthog.procyon.org.uk>
Date: Fri, 23 Sep 2016 16:16:33 +0100
From: David Howells <dhowells@...hat.com>
To: netdev@...r.kernel.org
Cc: dhowells@...hat.com, linux-afs@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next 11/15] rxrpc: Add a tracepoint for the call timer
Add a tracepoint to log call timer initiation, setting and expiry.
Signed-off-by: David Howells <dhowells@...hat.com>
---
include/trace/events/rxrpc.h | 36 ++++++++++++++++++++++++++++++++++++
net/rxrpc/ar-internal.h | 13 ++++++++++++-
net/rxrpc/call_event.c | 7 ++++---
net/rxrpc/call_object.c | 6 ++++--
net/rxrpc/misc.c | 8 ++++++++
net/rxrpc/sendmsg.c | 2 +-
6 files changed, 65 insertions(+), 7 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index e8f2afbbe0bf..57322897d745 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -414,6 +414,42 @@ TRACE_EVENT(rxrpc_rtt_rx,
__entry->avg)
);
+TRACE_EVENT(rxrpc_timer,
+ TP_PROTO(struct rxrpc_call *call, enum rxrpc_timer_trace why,
+ unsigned long now),
+
+ TP_ARGS(call, why, now),
+
+ TP_STRUCT__entry(
+ __field(struct rxrpc_call *, call )
+ __field(enum rxrpc_timer_trace, why )
+ __field(unsigned long, now )
+ __field(unsigned long, expire_at )
+ __field(unsigned long, ack_at )
+ __field(unsigned long, resend_at )
+ __field(unsigned long, timer )
+ ),
+
+ TP_fast_assign(
+ __entry->call = call;
+ __entry->why = why;
+ __entry->now = now;
+ __entry->expire_at = call->expire_at;
+ __entry->ack_at = call->ack_at;
+ __entry->resend_at = call->resend_at;
+ __entry->timer = call->timer.expires;
+ ),
+
+ TP_printk("c=%p %s now=%lx x=%ld a=%ld r=%ld t=%ld",
+ __entry->call,
+ rxrpc_timer_traces[__entry->why],
+ __entry->now,
+ __entry->expire_at - __entry->now,
+ __entry->ack_at - __entry->now,
+ __entry->resend_at - __entry->now,
+ __entry->timer - __entry->now)
+ );
+
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index a494d56eb236..e564eca75985 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -678,6 +678,17 @@ enum rxrpc_rtt_rx_trace {
extern const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5];
+enum rxrpc_timer_trace {
+ rxrpc_timer_begin,
+ rxrpc_timer_expired,
+ rxrpc_timer_set_for_ack,
+ rxrpc_timer_set_for_resend,
+ rxrpc_timer_set_for_send,
+ rxrpc_timer__nr_trace
+};
+
+extern const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8];
+
extern const char *const rxrpc_pkts[];
extern const char *rxrpc_acks(u8 reason);
@@ -707,7 +718,7 @@ int rxrpc_reject_call(struct rxrpc_sock *);
/*
* call_event.c
*/
-void rxrpc_set_timer(struct rxrpc_call *);
+void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace);
void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool);
void rxrpc_process_call(struct work_struct *);
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 8bc5c8e37ab4..90e970ba048a 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -24,7 +24,7 @@
/*
* Set the timer
*/
-void rxrpc_set_timer(struct rxrpc_call *call)
+void rxrpc_set_timer(struct rxrpc_call *call, enum rxrpc_timer_trace why)
{
unsigned long t, now = jiffies;
@@ -45,6 +45,7 @@ void rxrpc_set_timer(struct rxrpc_call *call)
if (call->timer.expires != t || !timer_pending(&call->timer)) {
mod_timer(&call->timer, t);
+ trace_rxrpc_timer(call, why, now);
}
}
@@ -120,7 +121,7 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
_debug("deferred ACK %ld < %ld", expiry, call->ack_at - now);
if (time_before(ack_at, call->ack_at)) {
call->ack_at = ack_at;
- rxrpc_set_timer(call);
+ rxrpc_set_timer(call, rxrpc_timer_set_for_ack);
}
}
}
@@ -293,7 +294,7 @@ recheck_state:
goto recheck_state;
}
- rxrpc_set_timer(call);
+ rxrpc_set_timer(call, rxrpc_timer_set_for_resend);
/* other events may have been raised since we started checking */
if (call->events && call->state < RXRPC_CALL_COMPLETE) {
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index f2fadf667e19..a53f4c2c0025 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -76,8 +76,10 @@ static void rxrpc_call_timer_expired(unsigned long _call)
_enter("%d", call->debug_id);
- if (call->state < RXRPC_CALL_COMPLETE)
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
rxrpc_queue_call(call);
+ }
}
/*
@@ -200,7 +202,7 @@ static void rxrpc_start_call_timer(struct rxrpc_call *call)
call->ack_at = expire_at;
call->resend_at = expire_at;
call->timer.expires = expire_at + 1;
- rxrpc_set_timer(call);
+ rxrpc_set_timer(call, rxrpc_timer_begin);
}
/*
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index fe648711c2f7..fa9942fabdf2 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -194,3 +194,11 @@ const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5] = {
[rxrpc_rtt_rx_ping_response] = "PONG",
[rxrpc_rtt_rx_requested_ack] = "RACK",
};
+
+const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8] = {
+ [rxrpc_timer_begin] = "Begin ",
+ [rxrpc_timer_expired] = "*EXPR*",
+ [rxrpc_timer_set_for_ack] = "SetAck",
+ [rxrpc_timer_set_for_send] = "SetTx ",
+ [rxrpc_timer_set_for_resend] = "SetRTx",
+};
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 93e6584cd751..99939372b5a4 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -153,7 +153,7 @@ static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
if (time_before(resend_at, call->resend_at)) {
call->resend_at = resend_at;
- rxrpc_set_timer(call);
+ rxrpc_set_timer(call, rxrpc_timer_set_for_send);
}
}
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