Re: [PATCH v2 16/16] hyper-v: trace vmbus_send_tl_connect_request()

[Stephen Hemminger]

I added an additional set of trace points for when channel gets notified or signals host.

diff -urNp linux-msft/drivers/hv/channel.c msft-4.14-rc3/drivers/hv/channel.c
--- linux-msft/drivers/hv/channel.c	2017-10-03 10:06:54.893209237 -0700
+++ msft-4.14-rc3/drivers/hv/channel.c	2017-10-03 10:07:35.501665114 -0700
@@ -55,6 +55,8 @@ void vmbus_setevent(struct vmbus_channel
 {
 	struct hv_monitor_page *monitorpage;
 
+	trace_vmbus_setevent(channel);
+
 	/*
 	 * For channels marked as in "low latency" mode
 	 * bypass the monitor page mechanism.
diff -urNp linux-msft/drivers/hv/connection.c msft-4.14-rc3/drivers/hv/connection.c
--- linux-msft/drivers/hv/connection.c	2017-10-03 10:06:54.893209237 -0700
+++ msft-4.14-rc3/drivers/hv/connection.c	2017-10-03 10:07:35.501665114 -0700
@@ -322,6 +322,8 @@ void vmbus_on_event(unsigned long data)
 	struct vmbus_channel *channel = (void *) data;
 	unsigned long time_limit = jiffies + 2;
 
+	trace_vmbus_on_event(channel);
+	
 	do {
 		void (*callback_fn)(void *);
 
diff -urNp linux-msft/drivers/hv/hv_trace.h msft-4.14-rc3/drivers/hv/hv_trace.h
--- linux-msft/drivers/hv/hv_trace.h	2017-10-03 10:08:06.514014019 -0700
+++ msft-4.14-rc3/drivers/hv/hv_trace.h	2017-10-03 10:07:35.505665159 -0700
@@ -294,6 +294,29 @@ TRACE_EVENT(vmbus_send_tl_connect_reques
 		    )
 	);
 
+DECLARE_EVENT_CLASS(vmbus_channel,
+	TP_PROTO(const struct vmbus_channel *channel),
+	TP_ARGS(channel),
+	TP_STRUCT__entry(__field(u32, relid)),
+	TP_fast_assign(__entry->relid = channel->offermsg.child_relid),
+	TP_printk("relid 0x%x", __entry->relid)
+);
+
+DEFINE_EVENT(vmbus_channel, vmbus_chan_sched,
+	    TP_PROTO(const struct vmbus_channel *channel),
+	    TP_ARGS(channel)
+);
+
+DEFINE_EVENT(vmbus_channel, vmbus_setevent,
+	    TP_PROTO(const struct vmbus_channel *channel),
+	    TP_ARGS(channel)
+);
+
+DEFINE_EVENT(vmbus_channel, vmbus_on_event,
+	    TP_PROTO(const struct vmbus_channel *channel),
+	    TP_ARGS(channel)
+);
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE
diff -urNp linux-msft/drivers/hv/vmbus_drv.c msft-4.14-rc3/drivers/hv/vmbus_drv.c
--- linux-msft/drivers/hv/vmbus_drv.c	2017-10-03 10:06:54.897209282 -0700
+++ msft-4.14-rc3/drivers/hv/vmbus_drv.c	2017-10-03 10:07:35.505665159 -0700
@@ -948,6 +948,7 @@ static void vmbus_chan_sched(struct hv_p
 				continue;
 
 			++channel->interrupts_in;
+			trace_vmbus_chan_sched(channel);
 
 			switch (channel->callback_mode) {
 			case HV_CALL_ISR: