linux-kernel - [PATCH 2/3] trace-cmd: Factor out print_exit

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Message-Id: <619c418c8af87f03027b8c8013b0443996605700.1388855989.git.jan.kiszka@web.de>
Date:	Sat,  4 Jan 2014 18:19:49 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-trace-users@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: [PATCH 2/3] trace-cmd: Factor out print_exit_reason in kvm plugin

From: Jan Kiszka <jan.kiszka@...mens.com>

We will reuse it for nested vmexit tracepoints.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 plugin_kvm.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/plugin_kvm.c b/plugin_kvm.c
index 59443e5..c407e55 100644
--- a/plugin_kvm.c
+++ b/plugin_kvm.c
@@ -244,15 +244,14 @@ static const char *find_exit_reason(unsigned isa, int val)
 	return strings[i].str;
 }
 
-static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
-			    struct event_format *event, void *context)
+static int print_exit_reason(struct trace_seq *s, struct pevent_record *record,
+			     struct event_format *event, const char *field)
 {
 	unsigned long long isa;
 	unsigned long long val;
-	unsigned long long info1 = 0, info2 = 0;
 	const char *reason;
 
-	if (pevent_get_field_val(s, event, "exit_reason", record, &val, 1) < 0)
+	if (pevent_get_field_val(s, event, field, record, &val, 1) < 0)
 		return -1;
 
 	if (pevent_get_field_val(s, event, "isa", record, &isa, 0) < 0)
@@ -263,6 +262,16 @@ static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
 		trace_seq_printf(s, "reason %s", reason);
 	else
 		trace_seq_printf(s, "reason UNKNOWN (%llu)", val);
+	return 0;
+}
+
+static int kvm_exit_handler(struct trace_seq *s, struct pevent_record *record,
+			    struct event_format *event, void *context)
+{
+	unsigned long long info1 = 0, info2 = 0;
+
+	if (print_exit_reason(s, record, event, "exit_reason") < 0)
+		return -1;
 
 	pevent_print_num_field(s, " rip 0x%lx", event, "guest_rip", record, 1);
 
-- 
1.8.1.1.298.ge7eed54

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