master: allow batching context switches for forward_modules()

-7 switches per task.

ansible_mitogen/services.py

@@ -269,8 +269,7 @@ class ContextService(mitogen.service.Service):
     )
 
     def _send_module_forwards(self, context):
-        for fullname in self.ALWAYS_PRELOAD:
+        self.router.responder.forward_modules(context, self.ALWAYS_PRELOAD)
-            self.router.responder.forward_module(context, fullname)
 
     _candidate_temp_dirs = None
 

mitogen/master.py

@@ -681,8 +681,7 @@ class ModuleResponder(object):
                 )
             )
 
-    def _forward_module(self, context, fullname):
+    def _forward_one_module(self, context, fullname):
-        IOLOG.debug('%r._forward_module(%r, %r)', self, context, fullname)
         path = []
         while fullname:
             path.append(fullname)
@@ -693,8 +692,13 @@ class ModuleResponder(object):
             self._send_module_and_related(stream, fullname)
             self._send_forward_module(stream, context, fullname)
 
-    def forward_module(self, context, fullname):
+    def _forward_modules(self, context, fullnames):
-        self._router.broker.defer(self._forward_module, context, fullname)
+        IOLOG.debug('%r._forward_modules(%r, %r)', self, context, fullnames)
+        for fullname in fullnames:
+            self._forward_one_module(context, fullname)
+
+    def forward_modules(self, context, fullnames):
+        self._router.broker.defer(self._forward_modules, context, fullnames)
 
 
 class Broker(mitogen.core.Broker):

mitogen/service.py

@@ -636,8 +636,7 @@ class PushFileService(Service):
         """
         for path in paths:
             self.propagate_to(context, path)
-        for fullname in modules:
+        self.router.responder.forward_modules(context, modules)
-            self.router.responder.forward_module(context, fullname)
 
     @expose(policy=AllowParents())
     @arg_spec({