perf intel-pt: Make logging slightly more efficient

Logging is only used for debugging. Use macros to save calling into the
functions only to return immediately when logging is not enabled.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1443186956-18718-5-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/intel-pt-decoder/intel-pt-log.c

@@ -29,18 +29,18 @@
 
 static FILE *f;
 static char log_name[MAX_LOG_NAME];
-static bool enable_logging;
+bool intel_pt_enable_logging;
 
 void intel_pt_log_enable(void)
 {
-	enable_logging = true;
+	intel_pt_enable_logging = true;
 }
 
 void intel_pt_log_disable(void)
 {
 	if (f)
 		fflush(f);
-	enable_logging = false;
+	intel_pt_enable_logging = false;
 }
 
 void intel_pt_log_set_name(const char *name)
@@ -80,7 +80,7 @@ static void intel_pt_print_no_data(uint64_t pos, int indent)
 
 static int intel_pt_log_open(void)
 {
-	if (!enable_logging)
+	if (!intel_pt_enable_logging)
 		return -1;
 
 	if (f)
@@ -91,15 +91,15 @@ static int intel_pt_log_open(void)
 
 	f = fopen(log_name, "w+");
 	if (!f) {
-		enable_logging = false;
+		intel_pt_enable_logging = false;
 		return -1;
 	}
 
 	return 0;
 }
 
-void intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
-			 uint64_t pos, const unsigned char *buf)
+void __intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
+			   uint64_t pos, const unsigned char *buf)
 {
 	char desc[INTEL_PT_PKT_DESC_MAX];
 
@@ -111,7 +111,7 @@ void intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
 	fprintf(f, "%s\n", desc);
 }
 
-void intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
+void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
 {
 	char desc[INTEL_PT_INSN_DESC_MAX];
 	size_t len = intel_pt_insn->length;
@@ -128,7 +128,8 @@ void intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
 		fprintf(f, "Bad instruction!\n");
 }
 
-void intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
+void __intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
+				 uint64_t ip)
 {
 	char desc[INTEL_PT_INSN_DESC_MAX];
 
@@ -142,7 +143,7 @@ void intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
 		fprintf(f, "Bad instruction!\n");
 }
 
-void intel_pt_log(const char *fmt, ...)
+void __intel_pt_log(const char *fmt, ...)
 {
 	va_list args;
 

tools/perf/util/intel-pt-decoder/intel-pt-log.h

@@ -25,20 +25,46 @@ void intel_pt_log_enable(void);
 void intel_pt_log_disable(void);
 void intel_pt_log_set_name(const char *name);
 
-void intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
-			 uint64_t pos, const unsigned char *buf);
+void __intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
+			   uint64_t pos, const unsigned char *buf);
 
 struct intel_pt_insn;
 
-void intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip);
-void intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
-			       uint64_t ip);
+void __intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip);
+void __intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
+				 uint64_t ip);
 
 __attribute__((format(printf, 1, 2)))
-void intel_pt_log(const char *fmt, ...);
+void __intel_pt_log(const char *fmt, ...);
+
+#define intel_pt_log(fmt, ...) \
+	do { \
+		if (intel_pt_enable_logging) \
+			__intel_pt_log(fmt, ##__VA_ARGS__); \
+	} while (0)
+
+#define intel_pt_log_packet(arg, ...) \
+	do { \
+		if (intel_pt_enable_logging) \
+			__intel_pt_log_packet(arg, ##__VA_ARGS__); \
+	} while (0)
+
+#define intel_pt_log_insn(arg, ...) \
+	do { \
+		if (intel_pt_enable_logging) \
+			__intel_pt_log_insn(arg, ##__VA_ARGS__); \
+	} while (0)
+
+#define intel_pt_log_insn_no_data(arg, ...) \
+	do { \
+		if (intel_pt_enable_logging) \
+			__intel_pt_log_insn_no_data(arg, ##__VA_ARGS__); \
+	} while (0)
 
 #define x64_fmt "0x%" PRIx64
 
+extern bool intel_pt_enable_logging;
+
 static inline void intel_pt_log_at(const char *msg, uint64_t u)
 {
 	intel_pt_log("%s at " x64_fmt "\n", msg, u);