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SUNRPC: Trace struct svc_sock lifetime events

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Capture a timestamp and pointer address during the creation and
destruction of struct svc_sock to record its lifetime. This helps
to diagnose transport reference counting issues.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-05-15 09:33:00 -04:00
parent d7900daea0
commit c42bebca96
2 changed files with 31 additions and 14 deletions
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41
include/trace/events/sunrpc.h
View file

@ -2104,31 +2104,46 @@ DEFINE_SVC_DEFERRED_EVENT(drop);
DEFINE_SVC_DEFERRED_EVENT(queue);
DEFINE_SVC_DEFERRED_EVENT(recv);
TRACE_EVENT(svcsock_new_socket,
DECLARE_EVENT_CLASS(svcsock_lifetime_class,
TP_PROTO(
const void *svsk,
const struct socket *socket
),
TP_ARGS(socket),
TP_ARGS(svsk, socket),
TP_STRUCT__entry(
__field(unsigned int, netns_ino)
__field(const void *, svsk)
__field(const void *, sk)
__field(unsigned long, type)
__field(unsigned long, family)
__field(bool, listener)
__field(unsigned long, state)
),
TP_fast_assign(
__entry->type = socket->type;
__entry->family = socket->sk->sk_family;
__entry->listener = (socket->sk->sk_state == TCP_LISTEN);
),
struct sock *sk = socket->sk;
TP_printk("type=%s family=%s%s",
show_socket_type(__entry->type),
__entry->netns_ino = sock_net(sk)->ns.inum;
__entry->svsk = svsk;
__entry->sk = sk;
__entry->type = socket->type;
__entry->family = sk->sk_family;
__entry->state = sk->sk_state;
),
TP_printk("svsk=%p type=%s family=%s%s",
__entry->svsk, show_socket_type(__entry->type),
rpc_show_address_family(__entry->family),
__entry->listener ? " (listener)" : ""
__entry->state == TCP_LISTEN ? " (listener)" : ""
)
);
#define DEFINE_SVCSOCK_LIFETIME_EVENT(name) \
DEFINE_EVENT(svcsock_lifetime_class, name, \
TP_PROTO( \
const void *svsk, \
const struct socket *socket \
), \
TP_ARGS(svsk, socket))
DEFINE_SVCSOCK_LIFETIME_EVENT(svcsock_new);
DEFINE_SVCSOCK_LIFETIME_EVENT(svcsock_free);
TRACE_EVENT(svcsock_marker,
TP_PROTO(

4
net/sunrpc/svcsock.c
View file

@ -1470,7 +1470,7 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
else
svc_tcp_init(svsk, serv);
trace_svcsock_new_socket(sock);
trace_svcsock_new(svsk, sock);
return svsk;
}
@ -1651,6 +1651,8 @@ static void svc_sock_free(struct svc_xprt *xprt)
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
struct socket *sock = svsk->sk_sock;
trace_svcsock_free(svsk, sock);
tls_handshake_cancel(sock->sk);
if (sock->file)
sockfd_put(sock);