linux-kernel - [PATCH v2 09/16] hyper-v: trace vmbus_request

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Message-Id: <20170929132602.24487-10-vkuznets@redhat.com>
Date:   Fri, 29 Sep 2017 15:25:55 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     devel@...uxdriverproject.org
Cc:     linux-kernel@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH v2 09/16] hyper-v: trace vmbus_request_offers()

Add tracepoint to CHANNELMSG_REQUESTOFFERS sender.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/hv/channel_mgmt.c | 4 +++-
 drivers/hv/hv_trace.h     | 8 ++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index a9a1fc1424c6..5c39388545f5 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -1218,9 +1218,11 @@ int vmbus_request_offers(void)
 
 	msg->msgtype = CHANNELMSG_REQUESTOFFERS;
 
-
 	ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header),
 			     true);
+
+	trace_vmbus_request_offers(ret);
+
 	if (ret != 0) {
 		pr_err("Unable to request offers - %d\n", ret);
 
diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h
index e99db56d27b7..7212d8898775 100644
--- a/drivers/hv/hv_trace.h
+++ b/drivers/hv/hv_trace.h
@@ -122,6 +122,14 @@ TRACE_EVENT(vmbus_onversion_response,
 	    TP_printk("version_supported %d", __entry->ver)
 	);
 
+TRACE_EVENT(vmbus_request_offers,
+	    TP_PROTO(int ret),
+	    TP_ARGS(ret),
+	    TP_STRUCT__entry(__field(int, ret)),
+	    TP_fast_assign(__entry->ret = ret),
+	    TP_printk("sending ret %d", __entry->ret)
+	);
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE
-- 
2.13.5