Merge branch 'master' into subchannel_factory_create_lb_channel

4 files changed, 180 insertions, 232 deletions

diff --git a/vsprojects/vcxproj/grpc/grpc.vcxproj b/vsprojects/vcxproj/grpc/grpc.vcxproj
index c9fae26fa2..0e7c944669 100644
--- a/vsprojects/vcxproj/grpc/grpc.vcxproj
+++ b/vsprojects/vcxproj/grpc/grpc.vcxproj
@@ -282,6 +282,12 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc\status.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\aggregation.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_interface.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_rpc_stats.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\mlog.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\rpc_metric_id.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\alpn.h" />
@@ -305,11 +311,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_map.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\timeout_encoding.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\varint.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\aggregation.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\mlog.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\rpc_metric_id.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_stack.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_stack_builder.h" />
@@ -344,17 +345,16 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\closure.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_windows.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\resolve_address.h" />
@@ -391,8 +391,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\secure_endpoint.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\security_connector.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\security_context.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_interface.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_rpc_stats.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\call.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\call_test_only.h" />
@@ -423,6 +421,24 @@
     <ClInclude Include="$(SolutionDir)\..\third_party\nanopb\pb_encode.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\context.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_context.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_plugin.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\initialize.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\mlog.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\operation.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\placeholders.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\tracing.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.c">
@@ -481,24 +497,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\writing.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\context.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_context.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\initialize.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\mlog.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\operation.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\placeholders.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\tracing.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\channel_stack.c">
@@ -571,12 +569,14 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair_windows.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.c">
@@ -585,14 +585,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_windows.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_epoll.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_poll_posix.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_windows.c">
diff --git a/vsprojects/vcxproj/grpc/grpc.vcxproj.filters b/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
index 9ab4297979..1b3b8bbf55 100644
--- a/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
@@ -1,6 +1,33 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\context.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_context.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_plugin.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\initialize.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\mlog.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\operation.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\placeholders.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\tracing.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
       <Filter>src\core\ext\lb_policy\grpclb</Filter>
     </ClCompile>
@@ -88,33 +115,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\writing.c">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\context.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_context.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\initialize.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\mlog.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\operation.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\placeholders.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\tracing.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.c">
       <Filter>src\core\lib\channel</Filter>
     </ClCompile>
@@ -223,13 +223,16 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair_windows.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.c">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.c">
@@ -244,18 +247,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_windows.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_epoll.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_poll_posix.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
@@ -539,6 +530,24 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\aggregation.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_interface.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_rpc_stats.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\mlog.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\rpc_metric_id.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h">
       <Filter>src\core\ext\lb_policy\grpclb</Filter>
     </ClInclude>
@@ -608,21 +617,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\varint.h">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\aggregation.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\mlog.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\rpc_metric_id.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.h">
       <Filter>src\core\lib\channel</Filter>
     </ClInclude>
@@ -725,13 +719,16 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.h">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.h">
@@ -749,15 +746,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.h">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.h">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
@@ -866,12 +857,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\security\security_context.h">
       <Filter>src\core\lib\security</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_interface.h">
-      <Filter>src\core\lib\statistics</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_rpc_stats.h">
-      <Filter>src\core\lib\statistics</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.h">
       <Filter>src\core\lib\surface</Filter>
     </ClInclude>
@@ -980,6 +965,9 @@
     <Filter Include="src\core\ext">
       <UniqueIdentifier>{3f32a58f-394f-5f13-06aa-6cc52cc2daaf}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\ext\census">
+      <UniqueIdentifier>{9bf70bd2-f553-11b2-c237-abd148971eea}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\ext\lb_policy">
       <UniqueIdentifier>{030f00ff-6c54-76c8-12df-37e3008335d1}</UniqueIdentifier>
     </Filter>
@@ -1034,9 +1022,6 @@
     <Filter Include="src\core\lib">
       <UniqueIdentifier>{5b2ded3f-84a5-f6b4-2060-286c7d1dc945}</UniqueIdentifier>
     </Filter>
-    <Filter Include="src\core\lib\census">
-      <UniqueIdentifier>{f4108884-98c3-ac2e-c669-83cd41343975}</UniqueIdentifier>
-    </Filter>
     <Filter Include="src\core\lib\channel">
       <UniqueIdentifier>{1931b044-90f3-cd68-b5f8-23be77ca8efc}</UniqueIdentifier>
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@@ -1064,9 +1049,6 @@
     <Filter Include="src\core\lib\security">
       <UniqueIdentifier>{c4661d64-349f-01c1-1ba8-0602f9047595}</UniqueIdentifier>
     </Filter>
-    <Filter Include="src\core\lib\statistics">
-      <UniqueIdentifier>{4dc3c48b-e931-ed47-ffa2-b4ea3a7956ec}</UniqueIdentifier>
-    </Filter>
     <Filter Include="src\core\lib\surface">
       <UniqueIdentifier>{a21971fb-304f-da08-b1b2-7bd8df8ac373}</UniqueIdentifier>
     </Filter>
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
index 195c8cf477..8654a8bc0e 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
@@ -272,6 +272,12 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc\status.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\aggregation.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_interface.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_rpc_stats.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\mlog.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\rpc_metric_id.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\alpn.h" />
@@ -295,11 +301,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\stream_map.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\timeout_encoding.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\varint.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\aggregation.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\mlog.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\rpc_metric_id.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_stack.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_stack_builder.h" />
@@ -334,17 +335,16 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\closure.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_windows.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\resolve_address.h" />
@@ -372,8 +372,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_common.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_reader.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\json\json_writer.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_interface.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_rpc_stats.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\call.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\call_test_only.h" />
@@ -399,6 +397,24 @@
     <ClInclude Include="$(SolutionDir)\..\third_party\nanopb\pb_encode.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\context.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_context.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_plugin.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\initialize.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\mlog.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\operation.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\placeholders.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\tracing.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\proto\grpc\lb\v0\load_balancer.pb.c">
@@ -453,24 +469,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\writing.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\context.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_context.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\initialize.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\mlog.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\operation.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\placeholders.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\tracing.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\channel_stack.c">
@@ -541,12 +539,14 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair_windows.c">
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.c">
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.c">
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.c">
@@ -555,14 +555,6 @@
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_windows.c">
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_epoll.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_poll_posix.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.c">
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.c">
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.c">
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_windows.c">
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index 67d0dd0929..c2418fb021 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -1,6 +1,33 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\context.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_context.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\grpc_plugin.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\initialize.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\mlog.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\operation.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\placeholders.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\ext\census\tracing.c">
+      <Filter>src\core\ext\census</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.c">
       <Filter>src\core\ext\lb_policy\grpclb</Filter>
     </ClCompile>
@@ -82,33 +109,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\ext\transport\chttp2\transport\writing.c">
       <Filter>src\core\ext\transport\chttp2\transport</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\context.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_context.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\initialize.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\mlog.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\operation.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\placeholders.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\census\tracing.c">
-      <Filter>src\core\lib\census</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.c">
       <Filter>src\core\lib\channel</Filter>
     </ClCompile>
@@ -214,13 +214,16 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair_windows.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.c">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.c">
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.c">
@@ -235,18 +238,6 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_windows.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_epoll.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_multipoller_with_poll_posix.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
-    <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.c">
-      <Filter>src\core\lib\iomgr</Filter>
-    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.c">
       <Filter>src\core\lib\iomgr</Filter>
     </ClCompile>
@@ -476,6 +467,24 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\aggregation.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_interface.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\census_rpc_stats.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\grpc_filter.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\mlog.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\ext\census\rpc_metric_id.h">
+      <Filter>src\core\ext\census</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\ext\lb_policy\grpclb\load_balancer_api.h">
       <Filter>src\core\ext\lb_policy\grpclb</Filter>
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@@ -545,21 +554,6 @@
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       <Filter>src\core\ext\transport\chttp2\transport</Filter>
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-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\aggregation.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_filter.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\grpc_plugin.h">
-      <Filter>src\core\lib\census</Filter>
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-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\mlog.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\census\rpc_metric_id.h">
-      <Filter>src\core\lib\census</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\channel_args.h">
       <Filter>src\core\lib\channel</Filter>
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@@ -662,13 +656,16 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\endpoint_pair.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_poll_and_epoll_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\ev_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\fd_posix.h">
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\exec_ctx.h">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\executor.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iocp_windows.h">
@@ -686,15 +683,9 @@
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-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_posix.h">
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-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_posix.h">
-      <Filter>src\core\lib\iomgr</Filter>
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     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\pollset_set_windows.h">
       <Filter>src\core\lib\iomgr</Filter>
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@@ -776,12 +767,6 @@
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-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_interface.h">
-      <Filter>src\core\lib\statistics</Filter>
-    </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\core\lib\statistics\census_rpc_stats.h">
-      <Filter>src\core\lib\statistics</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\surface\api_trace.h">
       <Filter>src\core\lib\surface</Filter>
     </ClInclude>
@@ -875,6 +860,9 @@
     <Filter Include="src\core\ext">
       <UniqueIdentifier>{82f86e8c-00a4-f566-d235-670fc629798d}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\ext\census">
+      <UniqueIdentifier>{3f21cd12-b8b9-18f8-8780-e21bbe2285d0}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\ext\lb_policy">
       <UniqueIdentifier>{a23781d2-27e4-7cb0-12cd-59782ecb21ce}</UniqueIdentifier>
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@@ -923,9 +911,6 @@
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-    <Filter Include="src\core\lib\census">
-      <UniqueIdentifier>{19582d5a-dab7-9dc1-c7e9-cc147fd52e5f}</UniqueIdentifier>
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     <Filter Include="src\core\lib\channel">
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@@ -950,9 +935,6 @@
     <Filter Include="src\core\lib\json">
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-    <Filter Include="src\core\lib\statistics">
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