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authorDavid Howells <dhowells@redhat.com>2016-09-17 12:49:14 +0300
committerDavid Howells <dhowells@redhat.com>2016-09-17 13:24:03 +0300
commit363deeab6d0f308d33d011323661ae9cf5f9f8d6 (patch)
tree65e374e65719b9dc56b39fb48b574ec1d8713592 /net/rxrpc/conn_object.c
parenta84a46d73050f70fd8820c74840e2815c78d8690 (diff)
downloadlinux-363deeab6d0f308d33d011323661ae9cf5f9f8d6.tar.xz
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>
Diffstat (limited to 'net/rxrpc/conn_object.c')
-rw-r--r--net/rxrpc/conn_object.c72
1 files changed, 69 insertions, 3 deletions
diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index bb1f29280aea..3b55aee0c436 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -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);
}
/*