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rxrpc: Add connection tracepoint and client conn state tracepoint 

Add a pair of tracepoints, one to track rxrpc_connection struct ref
counting and the other to track the client connection cache state.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-09-17 10:49:14 +01:00
parent a84a46d730
commit 363deeab6d
9 changed files with 273 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
include/trace/events/rxrpc.h
View File

@ -16,6 +16,66 @@
#include <linux/tracepoint.h>
TRACE_EVENT(rxrpc_conn,
TP_PROTO(struct rxrpc_connection *conn, enum rxrpc_conn_trace op,
int usage, const void *where),
TP_ARGS(conn, op, usage, where),
TP_STRUCT__entry(
__field(struct rxrpc_connection *, conn )
__field(int, op )
__field(int, usage )
__field(const void *, where )
),
TP_fast_assign(
__entry->conn = conn;
__entry->op = op;
__entry->usage = usage;
__entry->where = where;
),
TP_printk("C=%p %s u=%d sp=%pSR",
__entry->conn,
rxrpc_conn_traces[__entry->op],
__entry->usage,
__entry->where)
);
TRACE_EVENT(rxrpc_client,
TP_PROTO(struct rxrpc_connection *conn, int channel,
enum rxrpc_client_trace op),
TP_ARGS(conn, channel, op),
TP_STRUCT__entry(
__field(struct rxrpc_connection *, conn )
__field(u32, cid )
__field(int, channel )
__field(int, usage )
__field(enum rxrpc_client_trace, op )
__field(enum rxrpc_conn_cache_state, cs )
),
TP_fast_assign(
__entry->conn = conn;
__entry->channel = channel;
__entry->usage = atomic_read(&conn->usage);
__entry->op = op;
__entry->cid = conn->proto.cid;
__entry->cs = conn->cache_state;
),
TP_printk("C=%p h=%2d %s %s i=%08x u=%d",
__entry->conn,
__entry->channel,
rxrpc_client_traces[__entry->op],
rxrpc_conn_cache_states[__entry->cs],
__entry->cid,
__entry->usage)
);
TRACE_EVENT(rxrpc_call,
TP_PROTO(struct rxrpc_call *call, enum rxrpc_call_trace op,
int usage, const void *where, const void *aux),

76
net/rxrpc/ar-internal.h
View File

@ -314,6 +314,7 @@ enum rxrpc_conn_cache_state {
RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */
RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */
RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */
RXRPC_CONN__NR_CACHE_STATES
};
/*
@ -533,6 +534,44 @@ struct rxrpc_call {
rxrpc_serial_t acks_latest; /* serial number of latest ACK received */
};
enum rxrpc_conn_trace {
rxrpc_conn_new_client,
rxrpc_conn_new_service,
rxrpc_conn_queued,
rxrpc_conn_seen,
rxrpc_conn_got,
rxrpc_conn_put_client,
rxrpc_conn_put_service,
rxrpc_conn__nr_trace
};
extern const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4];
enum rxrpc_client_trace {
rxrpc_client_activate_chans,
rxrpc_client_alloc,
rxrpc_client_chan_activate,
rxrpc_client_chan_disconnect,
rxrpc_client_chan_pass,
rxrpc_client_chan_unstarted,
rxrpc_client_cleanup,
rxrpc_client_count,
rxrpc_client_discard,
rxrpc_client_duplicate,
rxrpc_client_exposed,
rxrpc_client_replace,
rxrpc_client_to_active,
rxrpc_client_to_culled,
rxrpc_client_to_idle,
rxrpc_client_to_inactive,
rxrpc_client_to_waiting,
rxrpc_client_uncount,
rxrpc_client__nr_trace
};
extern const char rxrpc_client_traces[rxrpc_client__nr_trace][7];
extern const char rxrpc_conn_cache_states[RXRPC_CONN__NR_CACHE_STATES][5];
enum rxrpc_call_trace {
rxrpc_call_new_client,
rxrpc_call_new_service,
@ -734,7 +773,11 @@ struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
void rxrpc_disconnect_call(struct rxrpc_call *);
void rxrpc_kill_connection(struct rxrpc_connection *);
void __rxrpc_put_connection(struct rxrpc_connection *);
bool rxrpc_queue_conn(struct rxrpc_connection *);
void rxrpc_see_connection(struct rxrpc_connection *);
void rxrpc_get_connection(struct rxrpc_connection *);
struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
void rxrpc_put_service_conn(struct rxrpc_connection *);
void __exit rxrpc_destroy_all_connections(void);
static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
@ -747,38 +790,15 @@ static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
return !rxrpc_conn_is_client(conn);
}
static inline void rxrpc_get_connection(struct rxrpc_connection *conn)
{
atomic_inc(&conn->usage);
}
static inline
struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
{
return atomic_inc_not_zero(&conn->usage) ? conn : NULL;
}
static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
{
if (!conn)
return;
if (rxrpc_conn_is_client(conn)) {
if (atomic_dec_and_test(&conn->usage))
rxrpc_put_client_conn(conn);
} else {
if (atomic_dec_return(&conn->usage) == 1)
__rxrpc_put_connection(conn);
}
}
static inline bool rxrpc_queue_conn(struct rxrpc_connection *conn)
{
if (!rxrpc_get_connection_maybe(conn))
return false;
if (!rxrpc_queue_work(&conn->processor))
rxrpc_put_connection(conn);
return true;
if (rxrpc_conn_is_client(conn))
rxrpc_put_client_conn(conn);
else
rxrpc_put_service_conn(conn);
}
/*

4
net/rxrpc/call_accept.c
View File

@ -85,6 +85,9 @@ static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
b->conn_backlog[head] = conn;
smp_store_release(&b->conn_backlog_head,
(head + 1) & (size - 1));
trace_rxrpc_conn(conn, rxrpc_conn_new_service,
atomic_read(&conn->usage), here);
}
/* Now it gets complicated, because calls get registered with the
@ -290,6 +293,7 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
rxrpc_get_local(local);
conn->params.local = local;
conn->params.peer = peer;
rxrpc_see_connection(conn);
rxrpc_new_incoming_connection(conn, skb);
} else {
rxrpc_get_connection(conn);

2
net/rxrpc/call_object.c
View File

@ -479,8 +479,6 @@ void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
struct rxrpc_call, accept_link);
list_del(&call->accept_link);
rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET);
rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
rxrpc_release_call(rx, call);
rxrpc_put_call(call, rxrpc_call_put);
}

80
net/rxrpc/conn_client.c
View File

@ -105,6 +105,14 @@ static void rxrpc_discard_expired_client_conns(struct work_struct *);
static DECLARE_DELAYED_WORK(rxrpc_client_conn_reap,
rxrpc_discard_expired_client_conns);
const char rxrpc_conn_cache_states[RXRPC_CONN__NR_CACHE_STATES][5] = {
[RXRPC_CONN_CLIENT_INACTIVE] = "Inac",
[RXRPC_CONN_CLIENT_WAITING] = "Wait",
[RXRPC_CONN_CLIENT_ACTIVE] = "Actv",
[RXRPC_CONN_CLIENT_CULLED] = "Cull",
[RXRPC_CONN_CLIENT_IDLE] = "Idle",
};
/*
* Get a connection ID and epoch for a client connection from the global pool.
* The connection struct pointer is then recorded in the idr radix tree. The
@ -220,6 +228,9 @@ rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp)
rxrpc_get_local(conn->params.local);
key_get(conn->params.key);
trace_rxrpc_conn(conn, rxrpc_conn_new_client, atomic_read(&conn->usage),
__builtin_return_address(0));
trace_rxrpc_client(conn, -1, rxrpc_client_alloc);
_leave(" = %p", conn);
return conn;
@ -385,6 +396,7 @@ static int rxrpc_get_client_conn(struct rxrpc_call *call,
rb_replace_node(&conn->client_node,
&candidate->client_node,
&local->client_conns);
trace_rxrpc_client(conn, -1, rxrpc_client_replace);
goto candidate_published;
}
}
@ -409,8 +421,11 @@ found_extant_conn:
_debug("found conn");
spin_unlock(&local->client_conns_lock);
rxrpc_put_connection(candidate);
candidate = NULL;
if (candidate) {
trace_rxrpc_client(candidate, -1, rxrpc_client_duplicate);
rxrpc_put_connection(candidate);
candidate = NULL;
}
spin_lock(&conn->channel_lock);
call->conn = conn;
@ -433,6 +448,7 @@ error:
*/
static void rxrpc_activate_conn(struct rxrpc_connection *conn)
{
trace_rxrpc_client(conn, -1, rxrpc_client_to_active);
conn->cache_state = RXRPC_CONN_CLIENT_ACTIVE;
rxrpc_nr_active_client_conns++;
list_move_tail(&conn->cache_link, &rxrpc_active_client_conns);
@ -462,8 +478,10 @@ static void rxrpc_animate_client_conn(struct rxrpc_connection *conn)
spin_lock(&rxrpc_client_conn_cache_lock);
nr_conns = rxrpc_nr_client_conns;
if (!test_and_set_bit(RXRPC_CONN_COUNTED, &conn->flags))
if (!test_and_set_bit(RXRPC_CONN_COUNTED, &conn->flags)) {
trace_rxrpc_client(conn, -1, rxrpc_client_count);
rxrpc_nr_client_conns = nr_conns + 1;
}
switch (conn->cache_state) {
case RXRPC_CONN_CLIENT_ACTIVE:
@ -494,6 +512,7 @@ activate_conn:
wait_for_capacity:
_debug("wait");
trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting);
conn->cache_state = RXRPC_CONN_CLIENT_WAITING;
list_move_tail(&conn->cache_link, &rxrpc_waiting_client_conns);
goto out_unlock;
@ -524,6 +543,8 @@ static void rxrpc_activate_one_channel(struct rxrpc_connection *conn,
struct rxrpc_call, chan_wait_link);
u32 call_id = chan->call_counter + 1;
trace_rxrpc_client(conn, channel, rxrpc_client_chan_activate);
write_lock_bh(&call->state_lock);
call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
write_unlock_bh(&call->state_lock);
@ -563,6 +584,8 @@ static void rxrpc_activate_channels(struct rxrpc_connection *conn)
_enter("%d", conn->debug_id);
trace_rxrpc_client(conn, -1, rxrpc_client_activate_chans);
if (conn->cache_state != RXRPC_CONN_CLIENT_ACTIVE ||
conn->active_chans == RXRPC_ACTIVE_CHANS_MASK)
return;
@ -657,10 +680,13 @@ int rxrpc_connect_call(struct rxrpc_call *call,
* had a chance at re-use (the per-connection security negotiation is
* expensive).
*/
static void rxrpc_expose_client_conn(struct rxrpc_connection *conn)
static void rxrpc_expose_client_conn(struct rxrpc_connection *conn,
unsigned int channel)
{
if (!test_and_set_bit(RXRPC_CONN_EXPOSED, &conn->flags))
if (!test_and_set_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
trace_rxrpc_client(conn, channel, rxrpc_client_exposed);
rxrpc_get_connection(conn);
}
}
/*
@ -669,9 +695,9 @@ static void rxrpc_expose_client_conn(struct rxrpc_connection *conn)
*/
void rxrpc_expose_client_call(struct rxrpc_call *call)
{
unsigned int channel = call->cid & RXRPC_CHANNELMASK;
struct rxrpc_connection *conn = call->conn;
struct rxrpc_channel *chan =
&conn->channels[call->cid & RXRPC_CHANNELMASK];
struct rxrpc_channel *chan = &conn->channels[channel];
if (!test_and_set_bit(RXRPC_CALL_EXPOSED, &call->flags)) {
/* Mark the call ID as being used. If the callNumber counter
@ -682,7 +708,7 @@ void rxrpc_expose_client_call(struct rxrpc_call *call)
chan->call_counter++;
if (chan->call_counter >= INT_MAX)
set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
rxrpc_expose_client_conn(conn);
rxrpc_expose_client_conn(conn, channel);
}
}
@ -695,6 +721,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
struct rxrpc_connection *conn = call->conn;
struct rxrpc_channel *chan = &conn->channels[channel];
trace_rxrpc_client(conn, channel, rxrpc_client_chan_disconnect);
call->conn = NULL;
spin_lock(&conn->channel_lock);
@ -709,6 +736,8 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags));
list_del_init(&call->chan_wait_link);
trace_rxrpc_client(conn, channel, rxrpc_client_chan_unstarted);
/* We must deactivate or idle the connection if it's now
* waiting for nothing.
*/
@ -739,7 +768,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
/* See if we can pass the channel directly to another call. */
if (conn->cache_state == RXRPC_CONN_CLIENT_ACTIVE &&
!list_empty(&conn->waiting_calls)) {
_debug("pass chan");
trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
rxrpc_activate_one_channel(conn, channel);
goto out_2;
}
@ -762,7 +791,7 @@ void rxrpc_disconnect_client_call(struct rxrpc_call *call)
goto out;
}
_debug("pass chan 2");
trace_rxrpc_client(conn, channel, rxrpc_client_chan_pass);
rxrpc_activate_one_channel(conn, channel);
goto out;
@ -794,7 +823,7 @@ idle_connection:
* immediately or moved to the idle list for a short while.
*/
if (test_bit(RXRPC_CONN_EXPOSED, &conn->flags)) {
_debug("make idle");
trace_rxrpc_client(conn, channel, rxrpc_client_to_idle);
conn->idle_timestamp = jiffies;
conn->cache_state = RXRPC_CONN_CLIENT_IDLE;
list_move_tail(&conn->cache_link, &rxrpc_idle_client_conns);
@ -804,7 +833,7 @@ idle_connection:
&rxrpc_client_conn_reap,
rxrpc_conn_idle_client_expiry);
} else {
_debug("make inactive");
trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive);
conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
list_del_init(&conn->cache_link);
}
@ -821,6 +850,8 @@ rxrpc_put_one_client_conn(struct rxrpc_connection *conn)
struct rxrpc_local *local = conn->params.local;
unsigned int nr_conns;
trace_rxrpc_client(conn, -1, rxrpc_client_cleanup);
if (test_bit(RXRPC_CONN_IN_CLIENT_CONNS, &conn->flags)) {
spin_lock(&local->client_conns_lock);
if (test_and_clear_bit(RXRPC_CONN_IN_CLIENT_CONNS,
@ -834,6 +865,7 @@ rxrpc_put_one_client_conn(struct rxrpc_connection *conn)
ASSERTCMP(conn->cache_state, ==, RXRPC_CONN_CLIENT_INACTIVE);
if (test_bit(RXRPC_CONN_COUNTED, &conn->flags)) {
trace_rxrpc_client(conn, -1, rxrpc_client_uncount);
spin_lock(&rxrpc_client_conn_cache_lock);
nr_conns = --rxrpc_nr_client_conns;
@ -863,20 +895,18 @@ rxrpc_put_one_client_conn(struct rxrpc_connection *conn)
*/
void rxrpc_put_client_conn(struct rxrpc_connection *conn)
{
struct rxrpc_connection *next;
const void *here = __builtin_return_address(0);
int n;
do {
_enter("%p{u=%d,d=%d}",
conn, atomic_read(&conn->usage), conn->debug_id);
n = atomic_dec_return(&conn->usage);
trace_rxrpc_conn(conn, rxrpc_conn_put_client, n, here);
if (n > 0)
return;
ASSERTCMP(n, >=, 0);
next = rxrpc_put_one_client_conn(conn);
if (!next)
break;
conn = next;
} while (atomic_dec_and_test(&conn->usage));
_leave("");
conn = rxrpc_put_one_client_conn(conn);
} while (conn);
}
/*
@ -907,9 +937,11 @@ static void rxrpc_cull_active_client_conns(void)
ASSERTCMP(conn->cache_state, ==, RXRPC_CONN_CLIENT_ACTIVE);
if (list_empty(&conn->waiting_calls)) {
trace_rxrpc_client(conn, -1, rxrpc_client_to_culled);
conn->cache_state = RXRPC_CONN_CLIENT_CULLED;
list_del_init(&conn->cache_link);
} else {
trace_rxrpc_client(conn, -1, rxrpc_client_to_waiting);
conn->cache_state = RXRPC_CONN_CLIENT_WAITING;
list_move_tail(&conn->cache_link,
&rxrpc_waiting_client_conns);
@ -983,7 +1015,7 @@ next:
goto not_yet_expired;
}
_debug("discard conn %d", conn->debug_id);
trace_rxrpc_client(conn, -1, rxrpc_client_discard);
if (!test_and_clear_bit(RXRPC_CONN_EXPOSED, &conn->flags))
BUG();
conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;

2
net/rxrpc/conn_event.c
View File

@ -377,7 +377,7 @@ void rxrpc_process_connection(struct work_struct *work)
u32 abort_code = RX_PROTOCOL_ERROR;
int ret;
_enter("{%d}", conn->debug_id);
rxrpc_see_connection(conn);
if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
rxrpc_secure_connection(conn);

72
net/rxrpc/conn_object.c
View File

@ -246,11 +246,77 @@ void rxrpc_kill_connection(struct rxrpc_connection *conn)
}
/*
* release a virtual connection
* Queue a connection's work processor, getting a ref to pass to the work
* queue.
*/
void __rxrpc_put_connection(struct rxrpc_connection *conn)
bool rxrpc_queue_conn(struct rxrpc_connection *conn)
{
rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
const void *here = __builtin_return_address(0);
int n = __atomic_add_unless(&conn->usage, 1, 0);
if (n == 0)
return false;
if (rxrpc_queue_work(&conn->processor))
trace_rxrpc_conn(conn, rxrpc_conn_queued, n + 1, here);
else
rxrpc_put_connection(conn);
return true;
}
/*
* Note the re-emergence of a connection.
*/
void rxrpc_see_connection(struct rxrpc_connection *conn)
{
const void *here = __builtin_return_address(0);
if (conn) {
int n = atomic_read(&conn->usage);
trace_rxrpc_conn(conn, rxrpc_conn_seen, n, here);
}
}
/*
* Get a ref on a connection.
*/
void rxrpc_get_connection(struct rxrpc_connection *conn)
{
const void *here = __builtin_return_address(0);
int n = atomic_inc_return(&conn->usage);
trace_rxrpc_conn(conn, rxrpc_conn_got, n, here);
}
/*
* Try to get a ref on a connection.
*/
struct rxrpc_connection *
rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
{
const void *here = __builtin_return_address(0);
if (conn) {
int n = __atomic_add_unless(&conn->usage, 1, 0);
if (n > 0)
trace_rxrpc_conn(conn, rxrpc_conn_got, n + 1, here);
else
conn = NULL;
}
return conn;
}
/*
* Release a service connection
*/
void rxrpc_put_service_conn(struct rxrpc_connection *conn)
{
const void *here = __builtin_return_address(0);
int n;
n = atomic_dec_return(&conn->usage);
trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here);
ASSERTCMP(n, >=, 0);
if (n == 0)
rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
}
/*

4
net/rxrpc/conn_service.c
View File

@ -136,6 +136,10 @@ struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t gfp)
list_add_tail(&conn->link, &rxrpc_connections);
list_add_tail(&conn->proc_link, &rxrpc_connection_proc_list);
write_unlock(&rxrpc_connection_lock);
trace_rxrpc_conn(conn, rxrpc_conn_new_service,
atomic_read(&conn->usage),
__builtin_return_address(0));
}
return conn;

31
net/rxrpc/misc.c
View File

@ -101,3 +101,34 @@ const char *rxrpc_acks(u8 reason)
reason = ARRAY_SIZE(str) - 1;
return str[reason];
}
const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4] = {
[rxrpc_conn_new_client] = "NWc",
[rxrpc_conn_new_service] = "NWs",
[rxrpc_conn_queued] = "QUE",
[rxrpc_conn_seen] = "SEE",
[rxrpc_conn_got] = "GOT",
[rxrpc_conn_put_client] = "PTc",
[rxrpc_conn_put_service] = "PTs",
};
const char rxrpc_client_traces[rxrpc_client__nr_trace][7] = {
[rxrpc_client_activate_chans] = "Activa",
[rxrpc_client_alloc] = "Alloc ",
[rxrpc_client_chan_activate] = "ChActv",
[rxrpc_client_chan_disconnect] = "ChDisc",
[rxrpc_client_chan_pass] = "ChPass",
[rxrpc_client_chan_unstarted] = "ChUnst",
[rxrpc_client_cleanup] = "Clean ",
[rxrpc_client_count] = "Count ",
[rxrpc_client_discard] = "Discar",
[rxrpc_client_duplicate] = "Duplic",
[rxrpc_client_exposed] = "Expose",
[rxrpc_client_replace] = "Replac",
[rxrpc_client_to_active] = "->Actv",
[rxrpc_client_to_culled] = "->Cull",
[rxrpc_client_to_idle] = "->Idle",
[rxrpc_client_to_inactive] = "->Inac",
[rxrpc_client_to_waiting] = "->Wait",
[rxrpc_client_uncount] = "Uncoun",
};