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:
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