rxrpc: Trace rxrpc_call usage
Add a trace event for debuging rxrpc_call struct usage.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 852c30d..104ee8b 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -219,6 +219,7 @@
{
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 @@
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_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 @@
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;
@@ -431,6 +439,44 @@
}
/*
+ * 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
*/
void rxrpc_release_call(struct rxrpc_call *call)
@@ -443,6 +489,8 @@
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 @@
_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 @@
{
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 @@
/*
* release a call
*/
-void __rxrpc_put_call(struct rxrpc_call *call)
+void rxrpc_put_call(struct rxrpc_call *call)
{
+ const void *here = __builtin_return_address(0);
+ int n, m;
+
ASSERT(call != NULL);
- _enter("%p{u=%d}", call, atomic_read(&call->usage));
-
- ASSERTCMP(atomic_read(&call->usage), >, 0);
-
- if (atomic_dec_and_test(&call->usage)) {
+ 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(atomic_read(&call->skb_count) != 0);
+ WARN_ON(m != 0);
ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
rxrpc_queue_work(&call->destroyer);
}
- _leave("");
+}
+
+/*
+ * 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(m != 0);
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ rxrpc_queue_work(&call->destroyer);
+ }
}
/*
@@ -705,6 +777,7 @@
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 @@
_enter("{%d}", call->debug_id);
+ rxrpc_see_call(call);
if (call->state >= RXRPC_CALL_COMPLETE)
return;
@@ -765,6 +839,7 @@
_enter("{%d}", call->debug_id);
+ rxrpc_see_call(call);
if (call->state >= RXRPC_CALL_COMPLETE)
return;
@@ -782,6 +857,7 @@
_enter("{%d}", call->debug_id);
+ rxrpc_see_call(call);
if (call->state >= RXRPC_CALL_COMPLETE)
return;