Tracing: Add lttng support for tracing on Linux.

Makefile

@@ -395,8 +395,9 @@ jslint:
 
 CPPLINT_EXCLUDE ?=
 CPPLINT_EXCLUDE += src/node_dtrace.cc
-CPPLINT_EXCLUDE += src/node_dtrace.cc
+CPPLINT_EXCLUDE += src/node_lttng.cc
 CPPLINT_EXCLUDE += src/node_root_certs.h
+CPPLINT_EXCLUDE += src/node_lttng_tp.h
 CPPLINT_EXCLUDE += src/node_win32_perfctr_provider.cc
 CPPLINT_EXCLUDE += src/queue.h
 CPPLINT_EXCLUDE += src/tree.h

configure

@@ -213,6 +213,11 @@ parser.add_option('--with-dtrace',
     dest='with_dtrace',
     help='build with DTrace (default is true on sunos)')
 
+parser.add_option('--with-lttng',
+    action='store_true',
+    dest='with_lttng',
+    help='build with Lttng (Only available to Linux)')
+
 parser.add_option('--with-etw',
     action='store_true',
     dest='with_etw',
@@ -524,6 +529,15 @@ def configure_node(o):
   else:
     o['variables']['node_use_dtrace'] = 'false'
 
+  # Enable Lttng if --with-lttng was defined. Use logic similar to
+  # ETW for windows. Lttng is only available on the Linux platform.
+  if flavor == 'linux':
+    o['variables']['node_use_lttng'] = b(options.with_lttng)
+  elif options.with_lttng:
+    raise Exception('lttng is only supported on Linux.')
+  else:
+    o['variables']['node_use_lttng'] = 'false'
+
   # if we're on illumos based systems wrap the helper library into the
   # executable
   if flavor == 'solaris':

lib/_http_client.js

@@ -155,6 +155,7 @@ ClientRequest.prototype.aborted = undefined;
 
 ClientRequest.prototype._finish = function() {
   DTRACE_HTTP_CLIENT_REQUEST(this, this.connection);
+  LTTNG_HTTP_CLIENT_REQUEST(this, this.connection);
   COUNTER_HTTP_CLIENT_REQUEST();
   OutgoingMessage.prototype._finish.call(this);
 };
@@ -386,6 +387,7 @@ function parserOnIncomingClient(res, shouldKeepAlive) {
 
 
   DTRACE_HTTP_CLIENT_RESPONSE(socket, req);
+  LTTNG_HTTP_CLIENT_RESPONSE(socket, req);
   COUNTER_HTTP_CLIENT_RESPONSE();
   req.res = res;
   res.req = req;

lib/_http_server.js

@@ -92,6 +92,7 @@ util.inherits(ServerResponse, OutgoingMessage);
 
 ServerResponse.prototype._finish = function() {
   DTRACE_HTTP_SERVER_RESPONSE(this.connection);
+  LTTNG_HTTP_SERVER_RESPONSE(this.connection);
   COUNTER_HTTP_SERVER_RESPONSE();
   OutgoingMessage.prototype._finish.call(this);
 };
@@ -416,6 +417,7 @@ function connectionListener(socket) {
 
     res.shouldKeepAlive = shouldKeepAlive;
     DTRACE_HTTP_SERVER_REQUEST(req, socket);
+    LTTNG_HTTP_SERVER_REQUEST(req, socket);
     COUNTER_HTTP_SERVER_REQUEST();
 
     if (socket._httpMessage) {

lib/net.js

@@ -387,6 +387,7 @@ Socket.prototype.end = function(data, encoding) {
   stream.Duplex.prototype.end.call(this, data, encoding);
   this.writable = false;
   DTRACE_NET_STREAM_END(this);
+  LTTNG_NET_STREAM_END(this);
 
   // just in case we're waiting for an EOF.
   if (this.readable && !this._readableState.endEmitted)
@@ -1324,6 +1325,7 @@ function onconnection(err, clientHandle) {
   socket.server = self;
 
   DTRACE_NET_SERVER_CONNECTION(socket);
+  LTTNG_NET_SERVER_CONNECTION(socket);
   COUNTER_NET_SERVER_CONNECTION(socket);
   self.emit('connection', socket);
 }

node.gyp

@@ -2,6 +2,7 @@
   'variables': {
     'v8_use_snapshot%': 'false',
     'node_use_dtrace%': 'false',
+    'node_use_lttng%': 'false',
     'node_use_etw%': 'false',
     'node_use_perfctr%': 'false',
     'node_has_winsdk%': 'false',
@@ -260,6 +261,14 @@
             }
           ] ]
         } ],
+        [ 'node_use_lttng=="true"', {
+          'defines': [ 'HAVE_LTTNG=1' ],
+          'include_dirs': [ '<(SHARED_INTERMEDIATE_DIR)' ],
+          'libraries': [ '-llttng-ust' ],
+          'sources': [
+            'src/node_lttng.cc'
+          ],
+        } ],
         [ 'node_use_mdb=="true"', {
           'dependencies': [ 'node_mdb' ],
           'include_dirs': [ '<(SHARED_INTERMEDIATE_DIR)' ],
@@ -450,6 +459,9 @@
             [ 'node_use_dtrace=="false" and node_use_etw=="false"', {
               'inputs': [ 'src/notrace_macros.py' ]
             }],
+            ['node_use_lttng=="false"', {
+              'inputs': [ 'src/nolttng_macros.py' ]
+            }],
             [ 'node_use_perfctr=="false"', {
               'inputs': [ 'src/perfctr_macros.py' ]
             }]

src/node.cc

@@ -23,6 +23,10 @@
 #include "node_dtrace.h"
 #endif
 
+#if defined HAVE_LTTNG
+#include "node_lttng.h"
+#endif
+
 #include "ares.h"
 #include "async-wrap.h"
 #include "async-wrap-inl.h"
@@ -2871,6 +2875,10 @@ void LoadEnvironment(Environment* env) {
   InitDTrace(env, global);
 #endif
 
+#if defined HAVE_LTTNG
+  InitLTTNG(env, global);
+#endif
+
 #if defined HAVE_PERFCTR
   InitPerfCounters(env, global);
 #endif