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Commit e34d4234 authored by David Howells's avatar David Howells
Browse files

rxrpc: Trace rxrpc_call usage 



Add a trace event for debuging rxrpc_call struct usage.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent f5c17aae

include/trace/events/rxrpc.h

+39 −0
Original line number Diff line number Diff line
@@ -16,6 +16,45 @@ 


#include <linux/tracepoint.h>



TRACE_EVENT(rxrpc_call,

	    TP_PROTO(struct rxrpc_call *call, int op, int usage, int nskb,

		     const void *where, const void *aux),



	    TP_ARGS(call, op, usage, nskb, where, aux),



	    TP_STRUCT__entry(

		    __field(struct rxrpc_call *,	call		)

		    __field(int,			op		)

		    __field(int,			usage		)

		    __field(int,			nskb		)

		    __field(const void *,		where		)

		    __field(const void *,		aux		)

			     ),



	    TP_fast_assign(

		    __entry->call = call;

		    __entry->op = op;

		    __entry->usage = usage;

		    __entry->nskb = nskb;

		    __entry->where = where;

		    __entry->aux = aux;

			   ),



	    TP_printk("c=%p %s u=%d s=%d p=%pSR a=%p",

		      __entry->call,

		      (__entry->op == 0 ? "NWc" :

		       __entry->op == 1 ? "NWs" :

		       __entry->op == 2 ? "SEE" :

		       __entry->op == 3 ? "GET" :

		       __entry->op == 4 ? "Gsb" :

		       __entry->op == 5 ? "PUT" :

		       "Psb"),

		      __entry->usage,

		      __entry->nskb,

		      __entry->where,

		      __entry->aux)

	    );



TRACE_EVENT(rxrpc_skb,

	    TP_PROTO(struct sk_buff *skb, int op, int usage, int mod_count,

		     const void *where),

net/rxrpc/ar-internal.h

+5 −14
Original line number Diff line number Diff line
@@ -543,7 +543,11 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *, 
				       struct sk_buff *);

void rxrpc_release_call(struct rxrpc_call *);

void rxrpc_release_calls_on_socket(struct rxrpc_sock *);

void __rxrpc_put_call(struct rxrpc_call *);

void rxrpc_see_call(struct rxrpc_call *);

void rxrpc_get_call(struct rxrpc_call *);

void rxrpc_put_call(struct rxrpc_call *);

void rxrpc_get_call_for_skb(struct rxrpc_call *, struct sk_buff *);

void rxrpc_put_call_for_skb(struct rxrpc_call *, struct sk_buff *);

void __exit rxrpc_destroy_all_calls(void);



static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
@@ -1022,16 +1026,3 @@ do { \ 
} while (0)



#endif /* __KDEBUGALL */
 




#define rxrpc_get_call(CALL)				\

do {							\

	CHECK_SLAB_OKAY(&(CALL)->usage);		\

	if (atomic_inc_return(&(CALL)->usage) == 1)	\

		BUG();					\

} while (0)



#define rxrpc_put_call(CALL)				\

do {							\

	__rxrpc_put_call(CALL);				\

} while (0)

net/rxrpc/call_accept.c

+3 −2
Original line number Diff line number Diff line
@@ -129,8 +129,7 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local, 
			_debug("conn ready");

			call->state = RXRPC_CALL_SERVER_ACCEPTING;

			list_add_tail(&call->accept_link, &rx->acceptq);

			rxrpc_get_call(call);

			atomic_inc(&call->skb_count);

			rxrpc_get_call_for_skb(call, notification);

			nsp = rxrpc_skb(notification);

			nsp->call = call;
@@ -323,6 +322,7 @@ struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx, 
	call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);

	list_del_init(&call->accept_link);

	sk_acceptq_removed(&rx->sk);

	rxrpc_see_call(call);



	write_lock_bh(&call->state_lock);

	switch (call->state) {
@@ -395,6 +395,7 @@ int rxrpc_reject_call(struct rxrpc_sock *rx) 
	call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);

	list_del_init(&call->accept_link);

	sk_acceptq_removed(&rx->sk);

	rxrpc_see_call(call);



	write_lock_bh(&call->state_lock);

	switch (call->state) {

net/rxrpc/call_event.c

+5 −6
Original line number Diff line number Diff line
@@ -465,8 +465,7 @@ static void rxrpc_insert_oos_packet(struct rxrpc_call *call, 
	skb->destructor = rxrpc_packet_destructor;

	ASSERTCMP(sp->call, ==, NULL);

	sp->call = call;

	rxrpc_get_call(call);

	atomic_inc(&call->skb_count);

	rxrpc_get_call_for_skb(call, skb);



	/* insert into the buffer in sequence order */

	spin_lock_bh(&call->lock);
@@ -741,8 +740,7 @@ static int rxrpc_process_rx_queue(struct rxrpc_call *call, 
		_debug("post ACK");

		skb->mark = RXRPC_SKB_MARK_FINAL_ACK;

		sp->call = call;

		rxrpc_get_call(call);

		atomic_inc(&call->skb_count);

		rxrpc_get_call_for_skb(call, skb);

		spin_lock_bh(&call->lock);

		if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0)

			BUG();
@@ -801,8 +799,7 @@ static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, 
		memset(sp, 0, sizeof(*sp));

		sp->error = error;

		sp->call = call;

		rxrpc_get_call(call);

		atomic_inc(&call->skb_count);

		rxrpc_get_call_for_skb(call, skb);



		spin_lock_bh(&call->lock);

		ret = rxrpc_queue_rcv_skb(call, skb, true, fatal);
@@ -834,6 +831,8 @@ void rxrpc_process_call(struct work_struct *work) 
	u32 serial, abort_code = RX_PROTOCOL_ERROR;

	u8 *acks = NULL;



	rxrpc_see_call(call);



	//printk("\n--------------------\n");

	_enter("{%d,%s,%lx} [%lu]",

	       call->debug_id, rxrpc_call_states[call->state], call->events,

net/rxrpc/call_object.c

+83 −7
Original line number Diff line number Diff line
@@ -219,6 +219,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 
{

	struct rxrpc_call *call, *xcall;

	struct rb_node *parent, **pp;

	const void *here = __builtin_return_address(0);

	int ret;



	_enter("%p,%lx", rx, user_call_ID);
@@ -229,6 +230,9 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 
		return call;

	}



	trace_rxrpc_call(call, 0, atomic_read(&call->usage), 0, here,

			 (const void *)user_call_ID);



	/* Publish the call, even though it is incompletely set up as yet */

	call->user_call_ID = user_call_ID;

	__set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
@@ -308,6 +312,7 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, 
{

	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);

	struct rxrpc_call *call, *candidate;

	const void *here = __builtin_return_address(0);

	u32 call_id, chan;



	_enter(",%d", conn->debug_id);
@@ -318,6 +323,9 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, 
	if (!candidate)

		return ERR_PTR(-EBUSY);



	trace_rxrpc_call(candidate, 1, atomic_read(&candidate->usage),

			 0, here, NULL);



	chan = sp->hdr.cid & RXRPC_CHANNELMASK;

	candidate->socket	= rx;

	candidate->conn		= conn;
@@ -430,6 +438,44 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, 
	return ERR_PTR(-ECONNRESET);

}



/*

 * Note the re-emergence of a call.

 */

void rxrpc_see_call(struct rxrpc_call *call)

{

	const void *here = __builtin_return_address(0);

	if (call) {

		int n = atomic_read(&call->usage);

		int m = atomic_read(&call->skb_count);



		trace_rxrpc_call(call, 2, n, m, here, 0);

	}

}



/*

 * Note the addition of a ref on a call.

 */

void rxrpc_get_call(struct rxrpc_call *call)

{

	const void *here = __builtin_return_address(0);

	int n = atomic_inc_return(&call->usage);

	int m = atomic_read(&call->skb_count);



	trace_rxrpc_call(call, 3, n, m, here, 0);

}



/*

 * Note the addition of a ref on a call for a socket buffer.

 */

void rxrpc_get_call_for_skb(struct rxrpc_call *call, struct sk_buff *skb)

{

	const void *here = __builtin_return_address(0);

	int n = atomic_inc_return(&call->usage);

	int m = atomic_inc_return(&call->skb_count);



	trace_rxrpc_call(call, 4, n, m, here, skb);

}



/*

 * detach a call from a socket and set up for release

 */
@@ -443,6 +489,8 @@ void rxrpc_release_call(struct rxrpc_call *call) 
	       atomic_read(&call->ackr_not_idle),

	       call->rx_first_oos);



	rxrpc_see_call(call);



	spin_lock_bh(&call->lock);

	if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))

		BUG();
@@ -526,6 +574,7 @@ static void rxrpc_dead_call_expired(unsigned long _call) 


	_enter("{%d}", call->debug_id);



	rxrpc_see_call(call);

	write_lock_bh(&call->state_lock);

	call->state = RXRPC_CALL_DEAD;

	write_unlock_bh(&call->state_lock);
@@ -540,6 +589,7 @@ static void rxrpc_mark_call_released(struct rxrpc_call *call) 
{

	bool sched;



	rxrpc_see_call(call);

	write_lock(&call->state_lock);

	if (call->state < RXRPC_CALL_DEAD) {

		sched = __rxrpc_abort_call(call, RX_CALL_DEAD, ECONNRESET);
@@ -585,21 +635,43 @@ void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 
/*

 * release a call

 */

void __rxrpc_put_call(struct rxrpc_call *call)

void rxrpc_put_call(struct rxrpc_call *call)

{

	ASSERT(call != NULL);

	const void *here = __builtin_return_address(0);

	int n, m;



	_enter("%p{u=%d}", call, atomic_read(&call->usage));

	ASSERT(call != NULL);



	ASSERTCMP(atomic_read(&call->usage), >, 0);

	n = atomic_dec_return(&call->usage);

	m = atomic_read(&call->skb_count);

	trace_rxrpc_call(call, 5, n, m, here, NULL);

	ASSERTCMP(n, >=, 0);

	if (n == 0) {

		_debug("call %d dead", call->debug_id);

		WARN_ON(m != 0);

		ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);

		rxrpc_queue_work(&call->destroyer);

	}

}



	if (atomic_dec_and_test(&call->usage)) {

/*

 * Release a call ref held by a socket buffer.

 */

void rxrpc_put_call_for_skb(struct rxrpc_call *call, struct sk_buff *skb)

{

	const void *here = __builtin_return_address(0);

	int n, m;



	n = atomic_dec_return(&call->usage);

	m = atomic_dec_return(&call->skb_count);

	trace_rxrpc_call(call, 6, n, m, here, skb);

	ASSERTCMP(n, >=, 0);

	if (n == 0) {

		_debug("call %d dead", call->debug_id);

		WARN_ON(atomic_read(&call->skb_count) != 0);

		WARN_ON(m != 0);

		ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);

		rxrpc_queue_work(&call->destroyer);

	}

	_leave("");

}



/*
@@ -705,6 +777,7 @@ void __exit rxrpc_destroy_all_calls(void) 
		call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);

		_debug("Zapping call %p", call);



		rxrpc_see_call(call);

		list_del_init(&call->link);



		switch (atomic_read(&call->usage)) {
@@ -748,6 +821,7 @@ static void rxrpc_call_life_expired(unsigned long _call) 


	_enter("{%d}", call->debug_id);



	rxrpc_see_call(call);

	if (call->state >= RXRPC_CALL_COMPLETE)

		return;
@@ -765,6 +839,7 @@ static void rxrpc_resend_time_expired(unsigned long _call) 


	_enter("{%d}", call->debug_id);



	rxrpc_see_call(call);

	if (call->state >= RXRPC_CALL_COMPLETE)

		return;
@@ -782,6 +857,7 @@ static void rxrpc_ack_time_expired(unsigned long _call) 


	_enter("{%d}", call->debug_id);



	rxrpc_see_call(call);

	if (call->state >= RXRPC_CALL_COMPLETE)

		return;