rxrpc: Implement a mechanism to send an event notification to a call

Provide a means by which an event notification can be sent to a call such
that the I/O thread can process it rather than it being done in a separate
workqueue.  This will allow a lot of locking to be removed.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

1 files changed, 52 insertions, 0 deletions

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 44a9be9836f9..0b12d96c7921 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -16,6 +16,13 @@
 /*
  * Declare tracing information enums and their string mappings for display.
  */
+#define rxrpc_call_poke_traces \
+	EM(rxrpc_call_poke_error,		"Error")	\
+	EM(rxrpc_call_poke_idle,		"Idle")		\
+	EM(rxrpc_call_poke_start,		"Start")	\
+	EM(rxrpc_call_poke_timer,		"Timer")	\
+	E_(rxrpc_call_poke_timer_now,		"Timer-now")
+
 #define rxrpc_skb_traces \
 	EM(rxrpc_skb_eaten_by_unshare,		"ETN unshare  ") \
 	EM(rxrpc_skb_eaten_by_unshare_nomem,	"ETN unshar-nm") \
@@ -150,6 +157,7 @@
 	EM(rxrpc_call_get_input,		"GET input   ") \
 	EM(rxrpc_call_get_kernel_service,	"GET krnl-srv") \
 	EM(rxrpc_call_get_notify_socket,	"GET notify  ") \
+	EM(rxrpc_call_get_poke,			"GET poke    ") \
 	EM(rxrpc_call_get_recvmsg,		"GET recvmsg ") \
 	EM(rxrpc_call_get_release_sock,		"GET rel-sock") \
 	EM(rxrpc_call_get_sendmsg,		"GET sendmsg ") \
@@ -160,6 +168,7 @@
 	EM(rxrpc_call_put_discard_prealloc,	"PUT disc-pre") \
 	EM(rxrpc_call_put_input,		"PUT input   ") \
 	EM(rxrpc_call_put_kernel,		"PUT kernel  ") \
+	EM(rxrpc_call_put_poke,			"PUT poke    ") \
 	EM(rxrpc_call_put_recvmsg,		"PUT recvmsg ") \
 	EM(rxrpc_call_put_release_sock,		"PUT rls-sock") \
 	EM(rxrpc_call_put_release_sock_tba,	"PUT rls-sk-a") \
@@ -378,6 +387,7 @@
 #define E_(a, b) a
 
 enum rxrpc_bundle_trace		{ rxrpc_bundle_traces } __mode(byte);
+enum rxrpc_call_poke_trace	{ rxrpc_call_poke_traces } __mode(byte);
 enum rxrpc_call_trace		{ rxrpc_call_traces } __mode(byte);
 enum rxrpc_client_trace		{ rxrpc_client_traces } __mode(byte);
 enum rxrpc_congest_change	{ rxrpc_congest_changes } __mode(byte);
@@ -408,6 +418,7 @@ enum rxrpc_txqueue_trace	{ rxrpc_txqueue_traces } __mode(byte);
 #define E_(a, b) TRACE_DEFINE_ENUM(a);
 
 rxrpc_bundle_traces;
+rxrpc_call_poke_traces;
 rxrpc_call_traces;
 rxrpc_client_traces;
 rxrpc_congest_changes;
@@ -1747,6 +1758,47 @@ TRACE_EVENT(rxrpc_txbuf,
 		      __entry->ref)
 	    );
 
+TRACE_EVENT(rxrpc_poke_call,
+	    TP_PROTO(struct rxrpc_call *call, bool busy,
+		     enum rxrpc_call_poke_trace what),
+
+	    TP_ARGS(call, busy, what),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		call_debug_id	)
+		    __field(bool,			busy		)
+		    __field(enum rxrpc_call_poke_trace,	what		)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->call_debug_id = call->debug_id;
+		    __entry->busy = busy;
+		    __entry->what = what;
+			   ),
+
+	    TP_printk("c=%08x %s%s",
+		      __entry->call_debug_id,
+		      __print_symbolic(__entry->what, rxrpc_call_poke_traces),
+		      __entry->busy ? "!" : "")
+	    );
+
+TRACE_EVENT(rxrpc_call_poked,
+	    TP_PROTO(struct rxrpc_call *call),
+
+	    TP_ARGS(call),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		call_debug_id	)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->call_debug_id = call->debug_id;
+			   ),
+
+	    TP_printk("c=%08x",
+		      __entry->call_debug_id)
+	    );
+
 #undef EM
 #undef E_
 #endif /* _TRACE_RXRPC_H */