[PATCH net-next 11/36] rxrpc: trace: Don't use __builtin_return_address for rxrpc_peer tracing

From: David Howells
Date: Thu Dec 01 2022 - 19:18:56 EST

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In rxrpc tracing, use enums to generate lists of points of interest rather
than __builtin_return_address() for the rxrpc_peer tracepoint

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
cc: linux-afs@xxxxxxxxxxxxxxxxxxx
---

include/trace/events/rxrpc.h | 43 +++++++++++++++++++++++++-----------------
net/rxrpc/af_rxrpc.c | 2 +-
net/rxrpc/ar-internal.h | 11 ++++++-----
net/rxrpc/call_accept.c | 8 +++++---
net/rxrpc/call_object.c | 2 +-
net/rxrpc/conn_client.c | 8 ++++----
net/rxrpc/conn_object.c | 2 +-
net/rxrpc/peer_event.c | 8 ++++----
net/rxrpc/peer_object.c | 34 ++++++++++++++++-----------------
net/rxrpc/sendmsg.c | 2 +-
10 files changed, 65 insertions(+), 55 deletions(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 015569845b1d..1c74143a51c1 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -63,10 +63,23 @@
E_(rxrpc_local_use_work, "USE work ")

#define rxrpc_peer_traces \
- EM(rxrpc_peer_got, "GOT") \
- EM(rxrpc_peer_new, "NEW") \
- EM(rxrpc_peer_processing, "PRO") \
- E_(rxrpc_peer_put, "PUT")
+ EM(rxrpc_peer_free, "FREE ") \
+ EM(rxrpc_peer_get_accept, "GET accept ") \
+ EM(rxrpc_peer_get_activate_call, "GET act-call") \
+ EM(rxrpc_peer_get_bundle, "GET bundle ") \
+ EM(rxrpc_peer_get_client_conn, "GET cln-conn") \
+ EM(rxrpc_peer_get_input_error, "GET inpt-err") \
+ EM(rxrpc_peer_get_keepalive, "GET keepaliv") \
+ EM(rxrpc_peer_get_lookup_client, "GET look-cln") \
+ EM(rxrpc_peer_get_service_conn, "GET srv-conn") \
+ EM(rxrpc_peer_new_client, "NEW client ") \
+ EM(rxrpc_peer_new_prealloc, "NEW prealloc") \
+ EM(rxrpc_peer_put_bundle, "PUT bundle ") \
+ EM(rxrpc_peer_put_call, "PUT call ") \
+ EM(rxrpc_peer_put_conn, "PUT conn ") \
+ EM(rxrpc_peer_put_discard_tmp, "PUT disc-tmp") \
+ EM(rxrpc_peer_put_input_error, "PUT inpt-err") \
+ E_(rxrpc_peer_put_keepalive, "PUT keepaliv")

#define rxrpc_conn_traces \
EM(rxrpc_conn_got, "GOT") \
@@ -394,30 +407,26 @@ TRACE_EVENT(rxrpc_local,
);

TRACE_EVENT(rxrpc_peer,
- TP_PROTO(unsigned int peer_debug_id, enum rxrpc_peer_trace op,
- int usage, const void *where),
+ TP_PROTO(unsigned int peer_debug_id, int ref, enum rxrpc_peer_trace why),

- TP_ARGS(peer_debug_id, op, usage, where),
+ TP_ARGS(peer_debug_id, ref, why),

TP_STRUCT__entry(
__field(unsigned int, peer )
- __field(int, op )
- __field(int, usage )
- __field(const void *, where )
+ __field(int, ref )
+ __field(int, why )
),

TP_fast_assign(
__entry->peer = peer_debug_id;
- __entry->op = op;
- __entry->usage = usage;
- __entry->where = where;
+ __entry->ref = ref;
+ __entry->why = why;
),

- TP_printk("P=%08x %s u=%d sp=%pSR",
+ TP_printk("P=%08x %s r=%d",
__entry->peer,
- __print_symbolic(__entry->op, rxrpc_peer_traces),
- __entry->usage,
- __entry->where)
+ __print_symbolic(__entry->why, rxrpc_peer_traces),
+ __entry->ref)
);

TRACE_EVENT(rxrpc_conn,
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 989ebca899f3..7a0dc01741e7 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -328,7 +328,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
mutex_unlock(&call->user_mutex);
}

- rxrpc_put_peer(cp.peer);
+ rxrpc_put_peer(cp.peer, rxrpc_peer_put_discard_tmp);
_leave(" = %p", call);
return call;
}
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index dde9ce21ef48..6cb111e9761c 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -1063,14 +1063,15 @@ struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
const struct sockaddr_rxrpc *);
struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
struct sockaddr_rxrpc *, gfp_t);
-struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
+struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
+ enum rxrpc_peer_trace);
void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
struct rxrpc_peer *);
void rxrpc_destroy_all_peers(struct rxrpc_net *);
-struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
-struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
-void rxrpc_put_peer(struct rxrpc_peer *);
-void rxrpc_put_peer_locked(struct rxrpc_peer *);
+struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
+struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
+void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
+void rxrpc_put_peer_locked(struct rxrpc_peer *, enum rxrpc_peer_trace);

/*
* proc.c
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 1b12d4e28373..f6bc3b07c3e5 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -70,7 +70,9 @@ static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
head = b->peer_backlog_head;
tail = READ_ONCE(b->peer_backlog_tail);
if (CIRC_CNT(head, tail, size) < max) {
- struct rxrpc_peer *peer = rxrpc_alloc_peer(rx->local, gfp);
+ struct rxrpc_peer *peer;
+
+ peer = rxrpc_alloc_peer(rx->local, gfp, rxrpc_peer_new_prealloc);
if (!peer)
return -ENOMEM;
b->peer_backlog[head] = peer;
@@ -286,7 +288,7 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
return NULL;

if (!conn) {
- if (peer && !rxrpc_get_peer_maybe(peer))
+ if (peer && !rxrpc_get_peer_maybe(peer, rxrpc_peer_get_service_conn))
peer = NULL;
if (!peer) {
peer = b->peer_backlog[peer_tail];
@@ -323,7 +325,7 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
call->conn = conn;
call->security = conn->security;
call->security_ix = conn->security_ix;
- call->peer = rxrpc_get_peer(conn->peer);
+ call->peer = rxrpc_get_peer(conn->peer, rxrpc_peer_get_accept);
call->cong_ssthresh = call->peer->cong_ssthresh;
call->tx_last_sent = ktime_get_real();
return call;
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 59928f0a8fe1..1b725afd6e2c 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -636,7 +636,7 @@ static void rxrpc_destroy_call(struct work_struct *work)
rxrpc_delete_call_timer(call);

rxrpc_put_connection(call->conn);
- rxrpc_put_peer(call->peer);
+ rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
kmem_cache_free(rxrpc_call_jar, call);
if (atomic_dec_and_test(&rxnet->nr_calls))
wake_up_var(&rxnet->nr_calls);
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c
index 9a69b4c1b182..9444da235a48 100644
--- a/net/rxrpc/conn_client.c
+++ b/net/rxrpc/conn_client.c
@@ -123,7 +123,7 @@ static struct rxrpc_bundle *rxrpc_alloc_bundle(struct rxrpc_conn_parameters *cp,
bundle = kzalloc(sizeof(*bundle), gfp);
if (bundle) {
bundle->local = cp->local;
- bundle->peer = rxrpc_get_peer(cp->peer);
+ bundle->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_bundle);
bundle->key = cp->key;
bundle->exclusive = cp->exclusive;
bundle->upgrade = cp->upgrade;
@@ -145,7 +145,7 @@ struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *bundle)

static void rxrpc_free_bundle(struct rxrpc_bundle *bundle)
{
- rxrpc_put_peer(bundle->peer);
+ rxrpc_put_peer(bundle->peer, rxrpc_peer_put_bundle);
kfree(bundle);
}

@@ -207,7 +207,7 @@ rxrpc_alloc_client_connection(struct rxrpc_bundle *bundle, gfp_t gfp)
write_unlock(&rxnet->conn_lock);

rxrpc_get_bundle(bundle);
- rxrpc_get_peer(conn->peer);
+ rxrpc_get_peer(conn->peer, rxrpc_peer_get_client_conn);
rxrpc_get_local(conn->local, rxrpc_local_get_client_conn);
key_get(conn->key);

@@ -543,7 +543,7 @@ static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,

rxrpc_see_call(call);
list_del_init(&call->chan_wait_link);
- call->peer = rxrpc_get_peer(conn->peer);
+ call->peer = rxrpc_get_peer(conn->peer, rxrpc_peer_get_activate_call);
call->conn = rxrpc_get_connection(conn);
call->cid = conn->proto.cid | channel;
call->call_id = call_id;
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index 725359afeac0..554ee5dd3325 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -362,7 +362,7 @@ static void rxrpc_destroy_connection(struct rcu_head *rcu)
conn->security->clear(conn);
key_put(conn->key);
rxrpc_put_bundle(conn->bundle);
- rxrpc_put_peer(conn->peer);
+ rxrpc_put_peer(conn->peer, rxrpc_peer_put_conn);

if (atomic_dec_and_test(&conn->local->rxnet->nr_conns))
wake_up_var(&conn->local->rxnet->nr_conns);
diff --git a/net/rxrpc/peer_event.c b/net/rxrpc/peer_event.c
index 3f8d104ecaa7..5e97d321ac38 100644
--- a/net/rxrpc/peer_event.c
+++ b/net/rxrpc/peer_event.c
@@ -168,7 +168,7 @@ void rxrpc_error_report(struct sock *sk)
}

peer = rxrpc_lookup_peer_local_rcu(local, skb, &srx);
- if (peer && !rxrpc_get_peer_maybe(peer))
+ if (peer && !rxrpc_get_peer_maybe(peer, rxrpc_peer_get_input_error))
peer = NULL;
if (!peer) {
rcu_read_unlock();
@@ -190,7 +190,7 @@ void rxrpc_error_report(struct sock *sk)
out:
rcu_read_unlock();
rxrpc_free_skb(skb, rxrpc_skb_freed);
- rxrpc_put_peer(peer);
+ rxrpc_put_peer(peer, rxrpc_peer_put_input_error);

_leave("");
}
@@ -263,7 +263,7 @@ static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet,
struct rxrpc_peer, keepalive_link);

list_del_init(&peer->keepalive_link);
- if (!rxrpc_get_peer_maybe(peer))
+ if (!rxrpc_get_peer_maybe(peer, rxrpc_peer_get_keepalive))
continue;

if (__rxrpc_use_local(peer->local, rxrpc_local_use_peer_keepalive)) {
@@ -291,7 +291,7 @@ static void rxrpc_peer_keepalive_dispatch(struct rxrpc_net *rxnet,
&rxnet->peer_keepalive[slot & mask]);
rxrpc_unuse_local(peer->local, rxrpc_local_unuse_peer_keepalive);
}
- rxrpc_put_peer_locked(peer);
+ rxrpc_put_peer_locked(peer, rxrpc_peer_put_keepalive);
}

spin_unlock_bh(&rxnet->peer_hash_lock);
diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c
index bcef897560e7..9e682a60a800 100644
--- a/net/rxrpc/peer_object.c
+++ b/net/rxrpc/peer_object.c
@@ -205,9 +205,9 @@ static void rxrpc_assess_MTU_size(struct rxrpc_sock *rx,
/*
* Allocate a peer.
*/
-struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
+struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp,
+ enum rxrpc_peer_trace why)
{
- const void *here = __builtin_return_address(0);
struct rxrpc_peer *peer;

_enter("");
@@ -226,7 +226,7 @@ struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
rxrpc_peer_init_rtt(peer);

peer->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
- trace_rxrpc_peer(peer->debug_id, rxrpc_peer_new, 1, here);
+ trace_rxrpc_peer(peer->debug_id, why, 1);
}

_leave(" = %p", peer);
@@ -282,7 +282,7 @@ static struct rxrpc_peer *rxrpc_create_peer(struct rxrpc_sock *rx,

_enter("");

- peer = rxrpc_alloc_peer(local, gfp);
+ peer = rxrpc_alloc_peer(local, gfp, rxrpc_peer_new_client);
if (peer) {
memcpy(&peer->srx, srx, sizeof(*srx));
rxrpc_init_peer(rx, peer, hash_key);
@@ -294,6 +294,7 @@ static struct rxrpc_peer *rxrpc_create_peer(struct rxrpc_sock *rx,

static void rxrpc_free_peer(struct rxrpc_peer *peer)
{
+ trace_rxrpc_peer(peer->debug_id, 0, rxrpc_peer_free);
rxrpc_put_local(peer->local, rxrpc_local_put_peer);
kfree_rcu(peer, rcu);
}
@@ -334,7 +335,7 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx,
/* search the peer list first */
rcu_read_lock();
peer = __rxrpc_lookup_peer_rcu(local, srx, hash_key);
- if (peer && !rxrpc_get_peer_maybe(peer))
+ if (peer && !rxrpc_get_peer_maybe(peer, rxrpc_peer_get_lookup_client))
peer = NULL;
rcu_read_unlock();

@@ -352,7 +353,7 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx,

/* Need to check that we aren't racing with someone else */
peer = __rxrpc_lookup_peer_rcu(local, srx, hash_key);
- if (peer && !rxrpc_get_peer_maybe(peer))
+ if (peer && !rxrpc_get_peer_maybe(peer, rxrpc_peer_get_lookup_client))
peer = NULL;
if (!peer) {
hash_add_rcu(rxnet->peer_hash,
@@ -376,27 +377,26 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx,
/*
* Get a ref on a peer record.
*/
-struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
+struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer, enum rxrpc_peer_trace why)
{
- const void *here = __builtin_return_address(0);
int r;

__refcount_inc(&peer->ref, &r);
- trace_rxrpc_peer(peer->debug_id, rxrpc_peer_got, r + 1, here);
+ trace_rxrpc_peer(peer->debug_id, why, r + 1);
return peer;
}

/*
* Get a ref on a peer record unless its usage has already reached 0.
*/
-struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
+struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer,
+ enum rxrpc_peer_trace why)
{
- const void *here = __builtin_return_address(0);
int r;

if (peer) {
if (__refcount_inc_not_zero(&peer->ref, &r))
- trace_rxrpc_peer(peer->debug_id, rxrpc_peer_got, r + 1, here);
+ trace_rxrpc_peer(peer->debug_id, r + 1, why);
else
peer = NULL;
}
@@ -423,9 +423,8 @@ static void __rxrpc_put_peer(struct rxrpc_peer *peer)
/*
* Drop a ref on a peer record.
*/
-void rxrpc_put_peer(struct rxrpc_peer *peer)
+void rxrpc_put_peer(struct rxrpc_peer *peer, enum rxrpc_peer_trace why)
{
- const void *here = __builtin_return_address(0);
unsigned int debug_id;
bool dead;
int r;
@@ -433,7 +432,7 @@ void rxrpc_put_peer(struct rxrpc_peer *peer)
if (peer) {
debug_id = peer->debug_id;
dead = __refcount_dec_and_test(&peer->ref, &r);
- trace_rxrpc_peer(debug_id, rxrpc_peer_put, r - 1, here);
+ trace_rxrpc_peer(debug_id, r - 1, why);
if (dead)
__rxrpc_put_peer(peer);
}
@@ -443,15 +442,14 @@ void rxrpc_put_peer(struct rxrpc_peer *peer)
* Drop a ref on a peer record where the caller already holds the
* peer_hash_lock.
*/
-void rxrpc_put_peer_locked(struct rxrpc_peer *peer)
+void rxrpc_put_peer_locked(struct rxrpc_peer *peer, enum rxrpc_peer_trace why)
{
- const void *here = __builtin_return_address(0);
unsigned int debug_id = peer->debug_id;
bool dead;
int r;

dead = __refcount_dec_and_test(&peer->ref, &r);
- trace_rxrpc_peer(debug_id, rxrpc_peer_put, r - 1, here);
+ trace_rxrpc_peer(debug_id, r - 1, why);
if (dead) {
hash_del_rcu(&peer->hash_link);
list_del_init(&peer->keepalive_link);
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index e5fd8a95bf71..cfe0badba0b3 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -604,7 +604,7 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
atomic_inc_return(&rxrpc_debug_id));
/* The socket is now unlocked */

- rxrpc_put_peer(cp.peer);
+ rxrpc_put_peer(cp.peer, rxrpc_peer_put_discard_tmp);
_leave(" = %p\n", call);
return call;
}

Next message: David Howells: "[PATCH net-next 12/36] rxrpc: trace: Don't use __builtin_return_address for rxrpc_conn tracing"
Previous message: David Howells: "[PATCH net-next 10/36] rxrpc: trace: Don't use __builtin_return_address for rxrpc_local tracing"
In reply to: David Howells: "[PATCH net-next 10/36] rxrpc: trace: Don't use __builtin_return_address for rxrpc_local tracing"
Next in thread: David Howells: "[PATCH net-next 12/36] rxrpc: trace: Don't use __builtin_return_address for rxrpc_conn tracing"
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