Merge github.com:google/grpc into fast-unref

36 files changed, 650 insertions, 61 deletions

diff --git a/BUILD b/BUILD
index 12fd6488b6..916f24eaf6 100644
--- a/BUILD
+++ b/BUILD
@@ -186,6 +186,8 @@ cc_library(
     "src/core/json/json_common.h",
     "src/core/json/json_reader.h",
     "src/core/json/json_writer.h",
+    "src/core/profiling/timers.h",
+    "src/core/profiling/timers_preciseclock.h",
     "src/core/statistics/census_interface.h",
     "src/core/statistics/census_log.h",
     "src/core/statistics/census_rpc_stats.h",
@@ -298,6 +300,7 @@ cc_library(
     "src/core/json/json_reader.c",
     "src/core/json/json_string.c",
     "src/core/json/json_writer.c",
+    "src/core/profiling/timers.c",
     "src/core/statistics/census_init.c",
     "src/core/statistics/census_log.c",
     "src/core/statistics/census_rpc_stats.c",
@@ -414,6 +417,8 @@ cc_library(
     "src/core/json/json_common.h",
     "src/core/json/json_reader.h",
     "src/core/json/json_writer.h",
+    "src/core/profiling/timers.h",
+    "src/core/profiling/timers_preciseclock.h",
     "src/core/statistics/census_interface.h",
     "src/core/statistics/census_log.h",
     "src/core/statistics/census_rpc_stats.h",
@@ -506,6 +511,7 @@ cc_library(
     "src/core/json/json_reader.c",
     "src/core/json/json_string.c",
     "src/core/json/json_writer.c",
+    "src/core/profiling/timers.c",
     "src/core/statistics/census_init.c",
     "src/core/statistics/census_log.c",
     "src/core/statistics/census_rpc_stats.c",
diff --git a/Makefile b/Makefile
index b86e76ac95..f42213def4 100644
--- a/Makefile
+++ b/Makefile
@@ -85,6 +85,15 @@ CPPFLAGS_opt = -O2
 LDFLAGS_opt =
 DEFINES_opt = NDEBUG
 
+VALID_CONFIG_latprof = 1
+CC_latprof = $(DEFAULT_CC)
+CXX_latprof = $(DEFAULT_CXX)
+LD_latprof = $(DEFAULT_CC)
+LDXX_latprof = $(DEFAULT_CXX)
+CPPFLAGS_latprof = -O2 -DGRPC_LATENCY_PROFILER
+LDFLAGS_latprof =
+DEFINES_latprof = NDEBUG
+
 VALID_CONFIG_dbg = 1
 CC_dbg = $(DEFAULT_CC)
 CXX_dbg = $(DEFAULT_CXX)
@@ -621,6 +630,7 @@ tcp_server_posix_test: $(BINDIR)/$(CONFIG)/tcp_server_posix_test
 time_averaged_stats_test: $(BINDIR)/$(CONFIG)/time_averaged_stats_test
 time_test: $(BINDIR)/$(CONFIG)/time_test
 timeout_encoding_test: $(BINDIR)/$(CONFIG)/timeout_encoding_test
+timers_test: $(BINDIR)/$(CONFIG)/timers_test
 transport_metadata_test: $(BINDIR)/$(CONFIG)/transport_metadata_test
 transport_security_test: $(BINDIR)/$(CONFIG)/transport_security_test
 async_end2end_test: $(BINDIR)/$(CONFIG)/async_end2end_test
@@ -1081,7 +1091,7 @@ privatelibs_cxx:  $(LIBDIR)/$(CONFIG)/libgrpc++_test_util.a $(LIBDIR)/$(CONFIG)/
 
 buildtests: buildtests_c buildtests_cxx
 
-buildtests_c: privatelibs_c $(BINDIR)/$(CONFIG)/alarm_heap_test $(BINDIR)/$(CONFIG)/alarm_list_test $(BINDIR)/$(CONFIG)/alarm_test $(BINDIR)/$(CONFIG)/alpn_test $(BINDIR)/$(CONFIG)/bin_encoder_test $(BINDIR)/$(CONFIG)/census_hash_table_test $(BINDIR)/$(CONFIG)/census_statistics_multiple_writers_circular_buffer_test $(BINDIR)/$(CONFIG)/census_statistics_multiple_writers_test $(BINDIR)/$(CONFIG)/census_statistics_performance_test $(BINDIR)/$(CONFIG)/census_statistics_quick_test $(BINDIR)/$(CONFIG)/census_statistics_small_log_test $(BINDIR)/$(CONFIG)/census_stub_test $(BINDIR)/$(CONFIG)/census_window_stats_test $(BINDIR)/$(CONFIG)/chttp2_status_conversion_test $(BINDIR)/$(CONFIG)/chttp2_stream_encoder_test $(BINDIR)/$(CONFIG)/chttp2_stream_map_test $(BINDIR)/$(CONFIG)/chttp2_transport_end2end_test $(BINDIR)/$(CONFIG)/dualstack_socket_test $(BINDIR)/$(CONFIG)/echo_client $(BINDIR)/$(CONFIG)/echo_server $(BINDIR)/$(CONFIG)/echo_test $(BINDIR)/$(CONFIG)/fd_posix_test $(BINDIR)/$(CONFIG)/fling_client $(BINDIR)/$(CONFIG)/fling_server $(BINDIR)/$(CONFIG)/fling_stream_test $(BINDIR)/$(CONFIG)/fling_test $(BINDIR)/$(CONFIG)/gpr_cancellable_test $(BINDIR)/$(CONFIG)/gpr_cmdline_test $(BINDIR)/$(CONFIG)/gpr_env_test $(BINDIR)/$(CONFIG)/gpr_file_test $(BINDIR)/$(CONFIG)/gpr_histogram_test $(BINDIR)/$(CONFIG)/gpr_host_port_test $(BINDIR)/$(CONFIG)/gpr_log_test $(BINDIR)/$(CONFIG)/gpr_slice_buffer_test $(BINDIR)/$(CONFIG)/gpr_slice_test $(BINDIR)/$(CONFIG)/gpr_string_test $(BINDIR)/$(CONFIG)/gpr_sync_test $(BINDIR)/$(CONFIG)/gpr_thd_test $(BINDIR)/$(CONFIG)/gpr_time_test $(BINDIR)/$(CONFIG)/gpr_tls_test $(BINDIR)/$(CONFIG)/gpr_useful_test $(BINDIR)/$(CONFIG)/grpc_base64_test $(BINDIR)/$(CONFIG)/grpc_byte_buffer_reader_test $(BINDIR)/$(CONFIG)/grpc_channel_stack_test $(BINDIR)/$(CONFIG)/grpc_completion_queue_test $(BINDIR)/$(CONFIG)/grpc_credentials_test $(BINDIR)/$(CONFIG)/grpc_json_token_test $(BINDIR)/$(CONFIG)/grpc_stream_op_test $(BINDIR)/$(CONFIG)/hpack_parser_test $(BINDIR)/$(CONFIG)/hpack_table_test $(BINDIR)/$(CONFIG)/httpcli_format_request_test $(BINDIR)/$(CONFIG)/httpcli_parser_test $(BINDIR)/$(CONFIG)/httpcli_test $(BINDIR)/$(CONFIG)/json_rewrite $(BINDIR)/$(CONFIG)/json_rewrite_test $(BINDIR)/$(CONFIG)/json_test $(BINDIR)/$(CONFIG)/lame_client_test $(BINDIR)/$(CONFIG)/message_compress_test $(BINDIR)/$(CONFIG)/metadata_buffer_test $(BINDIR)/$(CONFIG)/multi_init_test $(BINDIR)/$(CONFIG)/murmur_hash_test $(BINDIR)/$(CONFIG)/no_server_test $(BINDIR)/$(CONFIG)/poll_kick_posix_test $(BINDIR)/$(CONFIG)/resolve_address_test $(BINDIR)/$(CONFIG)/secure_endpoint_test $(BINDIR)/$(CONFIG)/sockaddr_utils_test $(BINDIR)/$(CONFIG)/tcp_client_posix_test $(BINDIR)/$(CONFIG)/tcp_posix_test $(BINDIR)/$(CONFIG)/tcp_server_posix_test $(BINDIR)/$(CONFIG)/time_averaged_stats_test $(BINDIR)/$(CONFIG)/time_test $(BINDIR)/$(CONFIG)/timeout_encoding_test $(BINDIR)/$(CONFIG)/transport_metadata_test $(BINDIR)/$(CONFIG)/transport_security_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_no_op_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fake_security_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_no_op_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_no_op_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_fullstack_uds_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_no_op_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_fullstack_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_simple_ssl_with_oauth2_fullstack_no_op_test 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$(BINDIR)/$(CONFIG)/chttp2_socket_pair_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_writes_done_hangs_with_pending_read_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_bad_hostname_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_and_writes_closed_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_invoke_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_before_invoke_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_in_a_vacuum_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_census_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_disappearing_server_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_inflight_calls_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_tags_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_empty_batch_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_graceful_server_shutdown_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_invoke_large_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_max_concurrent_streams_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_no_op_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_ping_pong_streaming_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_binary_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_metadata_and_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_large_metadata_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_payload_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_delayed_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_request_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_thread_stress_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_writes_done_hangs_with_pending_read_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_accept_and_writes_closed_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_after_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_before_invoke_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_cancel_in_a_vacuum_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_census_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_disappearing_server_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_inflight_calls_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_early_server_shutdown_finishes_tags_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_graceful_server_shutdown_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_invoke_large_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_max_concurrent_streams_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_no_op_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_ping_pong_streaming_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_binary_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_response_with_trailing_metadata_and_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_large_metadata_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_request_with_payload_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_delayed_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_simple_request_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_thread_stress_legacy_test $(BINDIR)/$(CONFIG)/chttp2_socket_pair_one_byte_at_a_time_writes_done_hangs_with_pending_read_legacy_test
 
 buildtests_cxx: privatelibs_cxx $(BINDIR)/$(CONFIG)/async_end2end_test $(BINDIR)/$(CONFIG)/channel_arguments_test $(BINDIR)/$(CONFIG)/cli_call_test $(BINDIR)/$(CONFIG)/credentials_test $(BINDIR)/$(CONFIG)/cxx_time_test $(BINDIR)/$(CONFIG)/end2end_test $(BINDIR)/$(CONFIG)/generic_end2end_test $(BINDIR)/$(CONFIG)/grpc_cli $(BINDIR)/$(CONFIG)/interop_client $(BINDIR)/$(CONFIG)/interop_server $(BINDIR)/$(CONFIG)/interop_test $(BINDIR)/$(CONFIG)/pubsub_client $(BINDIR)/$(CONFIG)/pubsub_publisher_test $(BINDIR)/$(CONFIG)/pubsub_subscriber_test $(BINDIR)/$(CONFIG)/qps_driver $(BINDIR)/$(CONFIG)/qps_smoke_test $(BINDIR)/$(CONFIG)/qps_worker $(BINDIR)/$(CONFIG)/status_test $(BINDIR)/$(CONFIG)/thread_pool_test
 
@@ -1220,6 +1230,8 @@ test_c: buildtests_c
 	$(Q) $(BINDIR)/$(CONFIG)/time_test || ( echo test time_test failed ; exit 1 )
 	$(E) "[RUN]     Testing timeout_encoding_test"
 	$(Q) $(BINDIR)/$(CONFIG)/timeout_encoding_test || ( echo test timeout_encoding_test failed ; exit 1 )
+	$(E) "[RUN]     Testing timers_test"
+	$(Q) $(BINDIR)/$(CONFIG)/timers_test || ( echo test timers_test failed ; exit 1 )
 	$(E) "[RUN]     Testing transport_metadata_test"
 	$(Q) $(BINDIR)/$(CONFIG)/transport_metadata_test || ( echo test transport_metadata_test failed ; exit 1 )
 	$(E) "[RUN]     Testing transport_security_test"
@@ -2634,6 +2646,7 @@ LIBGRPC_SRC = \
     src/core/json/json_reader.c \
     src/core/json/json_string.c \
     src/core/json/json_writer.c \
+    src/core/profiling/timers.c \
     src/core/statistics/census_init.c \
     src/core/statistics/census_log.c \
     src/core/statistics/census_rpc_stats.c \
@@ -2782,6 +2795,7 @@ src/core/json/json.c: $(OPENSSL_DEP)
 src/core/json/json_reader.c: $(OPENSSL_DEP)
 src/core/json/json_string.c: $(OPENSSL_DEP)
 src/core/json/json_writer.c: $(OPENSSL_DEP)
+src/core/profiling/timers.c: $(OPENSSL_DEP)
 src/core/statistics/census_init.c: $(OPENSSL_DEP)
 src/core/statistics/census_log.c: $(OPENSSL_DEP)
 src/core/statistics/census_rpc_stats.c: $(OPENSSL_DEP)
@@ -2946,6 +2960,7 @@ $(OBJDIR)/$(CONFIG)/src/core/json/json.o:
 $(OBJDIR)/$(CONFIG)/src/core/json/json_reader.o: 
 $(OBJDIR)/$(CONFIG)/src/core/json/json_string.o: 
 $(OBJDIR)/$(CONFIG)/src/core/json/json_writer.o: 
+$(OBJDIR)/$(CONFIG)/src/core/profiling/timers.o: 
 $(OBJDIR)/$(CONFIG)/src/core/statistics/census_init.o: 
 $(OBJDIR)/$(CONFIG)/src/core/statistics/census_log.o: 
 $(OBJDIR)/$(CONFIG)/src/core/statistics/census_rpc_stats.o: 
@@ -3126,6 +3141,7 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/json/json_reader.c \
     src/core/json/json_string.c \
     src/core/json/json_writer.c \
+    src/core/profiling/timers.c \
     src/core/statistics/census_init.c \
     src/core/statistics/census_log.c \
     src/core/statistics/census_rpc_stats.c \
@@ -3267,6 +3283,7 @@ $(OBJDIR)/$(CONFIG)/src/core/json/json.o:
 $(OBJDIR)/$(CONFIG)/src/core/json/json_reader.o: 
 $(OBJDIR)/$(CONFIG)/src/core/json/json_string.o: 
 $(OBJDIR)/$(CONFIG)/src/core/json/json_writer.o: 
+$(OBJDIR)/$(CONFIG)/src/core/profiling/timers.o: 
 $(OBJDIR)/$(CONFIG)/src/core/statistics/census_init.o: 
 $(OBJDIR)/$(CONFIG)/src/core/statistics/census_log.o: 
 $(OBJDIR)/$(CONFIG)/src/core/statistics/census_rpc_stats.o: 
@@ -8295,6 +8312,37 @@ endif
 endif
 
 
+TIMERS_TEST_SRC = \
+    test/core/profiling/timers_test.c \
+
+TIMERS_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(TIMERS_TEST_SRC))))
+
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL with ALPN.
+
+$(BINDIR)/$(CONFIG)/timers_test: openssl_dep_error
+
+else
+
+$(BINDIR)/$(CONFIG)/timers_test: $(TIMERS_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(TIMERS_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/timers_test
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/profiling/timers_test.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_timers_test: $(TIMERS_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(TIMERS_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 TRANSPORT_METADATA_TEST_SRC = \
     test/core/transport/metadata_test.c \
 
diff --git a/build.json b/build.json
index cb8d9433cf..0dfe7a1840 100644
--- a/build.json
+++ b/build.json
@@ -137,6 +137,8 @@
         "src/core/json/json_common.h",
         "src/core/json/json_reader.h",
         "src/core/json/json_writer.h",
+        "src/core/profiling/timers.h",
+        "src/core/profiling/timers_preciseclock.h",
         "src/core/statistics/census_interface.h",
         "src/core/statistics/census_log.h",
         "src/core/statistics/census_rpc_stats.h",
@@ -230,6 +232,7 @@
         "src/core/json/json_reader.c",
         "src/core/json/json_string.c",
         "src/core/json/json_writer.c",
+        "src/core/profiling/timers.c",
         "src/core/statistics/census_init.c",
         "src/core/statistics/census_log.c",
         "src/core/statistics/census_rpc_stats.c",
@@ -1766,6 +1769,20 @@
       ]
     },
     {
+      "name": "timers_test",
+      "build": "test",
+      "language": "c",
+      "src": [
+        "test/core/profiling/timers_test.c"
+      ],
+      "deps": [
+        "grpc_test_util",
+        "grpc",
+        "gpr_test_util",
+        "gpr"
+      ]
+    },
+    {
       "name": "transport_metadata_test",
       "build": "test",
       "language": "c",
diff --git a/src/core/profiling/timers.c b/src/core/profiling/timers.c
new file mode 100644
index 0000000000..478397d1bf
--- /dev/null
+++ b/src/core/profiling/timers.c
@@ -0,0 +1,138 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifdef GRPC_LATENCY_PROFILER
+
+#include "src/core/profiling/timers.h"
+#include "src/core/profiling/timers_preciseclock.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/time.h>
+#include <grpc/support/sync.h>
+#include <stdio.h>
+
+typedef struct grpc_timer_entry {
+  grpc_precise_clock tm;
+  const char* tag;
+  int seq;
+  const char* file;
+  int line;
+} grpc_timer_entry;
+
+struct grpc_timers_log {
+  gpr_mu mu;
+  grpc_timer_entry* log;
+  int num_entries;
+  int capacity;
+  int capacity_limit;
+  FILE* fp;
+};
+
+grpc_timers_log* grpc_timers_log_global = NULL;
+
+grpc_timers_log* grpc_timers_log_create(int capacity_limit, FILE* dump) {
+  grpc_timers_log* log = gpr_malloc(sizeof(*log));
+
+  /* TODO (vpai): Allow allocation below limit */
+  log->log = gpr_malloc(capacity_limit * sizeof(*log->log));
+
+  /* TODO (vpai): Improve concurrency, do per-thread logging? */
+  gpr_mu_init(&log->mu);
+
+  log->num_entries = 0;
+  log->capacity = log->capacity_limit = capacity_limit;
+
+  log->fp = dump;
+
+  return log;
+}
+
+static void log_report_locked(grpc_timers_log* log) {
+  FILE* fp = log->fp;
+  int i;
+  for (i = 0; i < log->num_entries; i++) {
+    grpc_timer_entry* entry = &(log->log[i]);
+    fprintf(fp, "GRPC_LAT_PROF ");
+    grpc_precise_clock_print(&entry->tm, fp);
+    fprintf(fp, " %s#%d,%s:%d\n", entry->tag, entry->seq, entry->file,
+            entry->line);
+  }
+
+  /* Now clear out the log */
+  log->num_entries = 0;
+}
+
+void grpc_timers_log_destroy(grpc_timers_log* log) {
+  gpr_mu_lock(&log->mu);
+  log_report_locked(log);
+  gpr_mu_unlock(&log->mu);
+
+  gpr_free(log->log);
+  gpr_mu_destroy(&log->mu);
+
+  gpr_free(log);
+}
+
+void grpc_timers_log_add(grpc_timers_log* log, const char* tag, int seq,
+                         const char* file, int line) {
+  grpc_timer_entry* entry;
+
+  /* TODO (vpai) : Improve concurrency */
+  gpr_mu_lock(&log->mu);
+  if (log->num_entries == log->capacity_limit) {
+    log_report_locked(log);
+  }
+
+  entry = &log->log[log->num_entries++];
+
+  grpc_precise_clock_now(&entry->tm);
+  entry->tag = tag;
+  entry->seq = seq;
+  entry->file = file;
+  entry->line = line;
+
+  gpr_mu_unlock(&log->mu);
+}
+
+void grpc_timers_log_global_init(void) {
+  grpc_timers_log_global = grpc_timers_log_create(100000, stdout);
+}
+
+void grpc_timers_log_global_destroy(void) {
+  grpc_timers_log_destroy(grpc_timers_log_global);
+}
+#else  /* !GRPC_LATENCY_PROFILER */
+void grpc_timers_log_global_init(void) {}
+void grpc_timers_log_global_destroy(void) {}
+#endif /* GRPC_LATENCY_PROFILER */
diff --git a/src/core/profiling/timers.h b/src/core/profiling/timers.h
new file mode 100644
index 0000000000..ef4cad112a
--- /dev/null
+++ b/src/core/profiling/timers.h
@@ -0,0 +1,70 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_CORE_PROFILING_TIMERS_H
+#define GRPC_CORE_PROFILING_TIMERS_H
+
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef GRPC_LATENCY_PROFILER
+
+typedef struct grpc_timers_log grpc_timers_log;
+
+grpc_timers_log *grpc_timers_log_create(int capacity_limit, FILE *dump);
+void grpc_timers_log_add(grpc_timers_log *, const char *tag, int seq,
+                         const char *file, int line);
+void grpc_timers_log_destroy(grpc_timers_log *);
+
+extern grpc_timers_log *grpc_timers_log_global;
+
+#define GRPC_TIMER_MARK(x, s) \
+  grpc_timers_log_add(grpc_timers_log_global, #x, s, __FILE__, __LINE__)
+
+#else /* !GRPC_LATENCY_PROFILER */
+#define GRPC_TIMER_MARK(x, s) \
+  do {                        \
+  } while (0)
+#endif /* GRPC_LATENCY_PROFILER */
+
+void grpc_timers_log_global_init(void);
+void grpc_timers_log_global_destroy(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRPC_CORE_PROFILING_TIMERS_H */
diff --git a/src/core/profiling/timers_preciseclock.h b/src/core/profiling/timers_preciseclock.h
new file mode 100644
index 0000000000..bf4a0eab8a
--- /dev/null
+++ b/src/core/profiling/timers_preciseclock.h
@@ -0,0 +1,56 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H
+#define GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H
+
+#include <grpc/support/time.h>
+#include <stdio.h>
+
+typedef struct grpc_precise_clock grpc_precise_clock;
+
+#ifdef GRPC_TIMERS_RDTSC
+#error RDTSC timers not currently supported
+#else
+struct grpc_precise_clock {
+  gpr_timespec clock;
+};
+static void grpc_precise_clock_now(grpc_precise_clock* clk) {
+  clk->clock = gpr_now();
+}
+static void grpc_precise_clock_print(const grpc_precise_clock* clk, FILE* fp) {
+  fprintf(fp, "%ld.%09d", clk->clock.tv_sec, clk->clock.tv_nsec);
+}
+#endif /* GRPC_TIMERS_RDTSC */
+
+#endif /* GRPC_CORE_PROFILING_TIMERS_PRECISECLOCK_H */
diff --git a/src/core/surface/init.c b/src/core/surface/init.c
index d4f0eb40e8..4de51a666f 100644
--- a/src/core/surface/init.c
+++ b/src/core/surface/init.c
@@ -32,10 +32,11 @@
  */
 
 #include <grpc/grpc.h>
-#include "src/core/iomgr/iomgr.h"
+#include "src/core/channel/channel_stack.h"
 #include "src/core/debug/trace.h"
+#include "src/core/iomgr/iomgr.h"
 #include "src/core/statistics/census_interface.h"
-#include "src/core/channel/channel_stack.h"
+#include "src/core/profiling/timers.h"
 #include "src/core/surface/call.h"
 #include "src/core/surface/init.h"
 #include "src/core/surface/surface_trace.h"
@@ -63,6 +64,7 @@ void grpc_init(void) {
     grpc_tracer_init("GRPC_TRACE");
     grpc_iomgr_init();
     census_init();
+    grpc_timers_log_global_init();
   }
   gpr_mu_unlock(&g_init_mu);
 }
@@ -72,6 +74,7 @@ void grpc_shutdown(void) {
   if (--g_initializations == 0) {
     grpc_iomgr_shutdown();
     census_shutdown();
+    grpc_timers_log_global_destroy();
   }
   gpr_mu_unlock(&g_init_mu);
 }
diff --git a/src/ruby/.rubocop_todo.yml b/src/ruby/.rubocop_todo.yml
index d5bb55e5a8..d9fe0a5835 100644
--- a/src/ruby/.rubocop_todo.yml
+++ b/src/ruby/.rubocop_todo.yml
@@ -1,42 +1,30 @@
 # This configuration was generated by `rubocop --auto-gen-config`
-# on 2015-01-16 02:30:04 -0800 using RuboCop version 0.28.0.
+# on 2015-04-14 09:35:44 -0700 using RuboCop version 0.29.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 3
-# Lint/UselessAssignment:
-#  Enabled: false
-
-# Offense count: 33
+# Offense count: 32
 Metrics/AbcSize:
-  Max: 39
+  Max: 36
 
-# Offense count: 3
+# Offense count: 2
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 231
-
-# Offense count: 2
-Metrics/CyclomaticComplexity:
-  Max: 8
+  Max: 183
 
-# Offense count: 36
+# Offense count: 35
 # Configuration parameters: CountComments.
 Metrics/MethodLength:
-  Max: 37
+  Max: 36
 
-# Offense count: 8
+# Offense count: 7
 # Configuration parameters: CountKeywordArgs.
 Metrics/ParameterLists:
   Max: 8
 
-# Offense count: 2
-Metrics/PerceivedComplexity:
-  Max: 10
-
-# Offense count: 7
+# Offense count: 6
 # Configuration parameters: AllowedVariables.
 Style/GlobalVars:
   Enabled: false
@@ -50,3 +38,7 @@ Style/Next:
 # Configuration parameters: Methods.
 Style/SingleLineBlockParams:
   Enabled: false
+
+# Offense count: 1
+Style/StructInheritance:
+  Enabled: false
diff --git a/src/ruby/CHANGELOG.md b/src/ruby/CHANGELOG.md
new file mode 100644
index 0000000000..8ec6e3cfdb
--- /dev/null
+++ b/src/ruby/CHANGELOG.md
@@ -0,0 +1,11 @@
+## 0.6.1 (2015-04-14)
+
+### Changes
+
+* Begins this ChangeLog ([@tbetbetbe][])
+* Updates to version 0.4 of googleauth. ([@tbetbetbe][])
+* Switch the extension to use the call API. ([@tbetbetbe][])
+* Refactor the C extension to avoid identifiers used by ruby ([@yugui][])
+
+[@tbetbetbe]: https://github.com/tbetbetbe
+[@yugui]: https://github.com/yugui
diff --git a/src/ruby/bin/apis/pubsub_demo.rb b/src/ruby/bin/apis/pubsub_demo.rb
index 9bb324ff64..6d69b0f21e 100755
--- a/src/ruby/bin/apis/pubsub_demo.rb
+++ b/src/ruby/bin/apis/pubsub_demo.rb
@@ -71,7 +71,7 @@ end
 
 # Builds the metadata authentication update proc.
 def auth_proc(opts)
-  auth_creds = Google::Auth.get_application_default(opts.oauth_scope)
+  auth_creds = Google::Auth.get_application_default
   return auth_creds.updater_proc
 end
 
@@ -213,17 +213,14 @@ class NamedActions
 end
 
 # Args is used to hold the command line info.
-Args = Struct.new(:host, :oauth_scope, :port, :action, :project_id, :topic_name,
+Args = Struct.new(:host, :port, :action, :project_id, :topic_name,
                   :sub_name)
 
 # validates the the command line options, returning them as an Arg.
 def parse_args
   args = Args.new('pubsub-staging.googleapis.com',
-                  'https://www.googleapis.com/auth/pubsub',
                    443, 'list_some_topics', 'stoked-keyword-656')
   OptionParser.new do |opts|
-    opts.on('--oauth_scope scope',
-            'Scope for OAuth tokens') { |v| args['oauth_scope'] = v }
     opts.on('--server_host SERVER_HOST', 'server hostname') do |v|
       args.host = v
     end
@@ -250,7 +247,7 @@ def parse_args
 end
 
 def _check_args(args)
-  %w(host port action oauth_scope).each do |a|
+  %w(host port action).each do |a|
     if args[a].nil?
       raise OptionParser::MissingArgument.new("please specify --#{a}")
     end
diff --git a/src/ruby/bin/interop/interop_client.rb b/src/ruby/bin/interop/interop_client.rb
index b2a8711c79..af7a1d5b15 100755
--- a/src/ruby/bin/interop/interop_client.rb
+++ b/src/ruby/bin/interop/interop_client.rb
@@ -110,6 +110,11 @@ def create_stub(opts)
       end
     end
 
+    if opts.test_case == 'jwt_token_creds'  # don't use a scope
+      auth_creds = Google::Auth.get_application_default
+      stub_opts[:update_metadata] = auth_creds.updater_proc
+    end
+
     logger.info("... connecting securely to #{address}")
     Grpc::Testing::TestService::Stub.new(address, **stub_opts)
   else
@@ -201,6 +206,15 @@ class NamedTests
     p 'OK: service_account_creds'
   end
 
+  def jwt_token_creds
+    json_key = File.read(ENV[AUTH_ENV])
+    wanted_email = MultiJson.load(json_key)['client_email']
+    resp = perform_large_unary(fill_username: true)
+    assert_equal(wanted_email, resp.username,
+                 'service_account_creds: incorrect username')
+    p 'OK: jwt_token_creds'
+  end
+
   def compute_engine_creds
     resp = perform_large_unary(fill_username: true,
                                fill_oauth_scope: true)
diff --git a/src/ruby/grpc.gemspec b/src/ruby/grpc.gemspec
index 45cbacfeb0..a50d0351da 100755
--- a/src/ruby/grpc.gemspec
+++ b/src/ruby/grpc.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.platform      = Gem::Platform::RUBY
 
   s.add_dependency 'google-protobuf', '~> 3.0.0alpha.1.1'
-  s.add_dependency 'googleauth', '~> 0.1'
+  s.add_dependency 'googleauth', '~> 0.4'
   s.add_dependency 'logging', '~> 1.8'
   s.add_dependency 'minitest', '~> 5.4'  # reqd for interop tests
   s.add_dependency 'xray', '~> 1.1'
diff --git a/src/ruby/lib/grpc/generic/client_stub.rb b/src/ruby/lib/grpc/generic/client_stub.rb
index 6547a1499e..dc7672d359 100644
--- a/src/ruby/lib/grpc/generic/client_stub.rb
+++ b/src/ruby/lib/grpc/generic/client_stub.rb
@@ -52,6 +52,14 @@ module GRPC
       Core::Channel.new(host, kw, creds)
     end
 
+    def self.update_with_jwt_aud_uri(a_hash, host, method)
+      last_slash_idx, res = method.rindex('/'), a_hash.clone
+      return res if last_slash_idx.nil?
+      service_name = method[0..(last_slash_idx - 1)]
+      res[:jwt_aud_uri] = "https://#{host}#{service_name}"
+      res
+    end
+
     # check_update_metadata is used by #initialize verify that it's a Proc.
     def self.check_update_metadata(update_metadata)
       return update_metadata if update_metadata.nil?
@@ -147,7 +155,8 @@ module GRPC
     def request_response(method, req, marshal, unmarshal, timeout = nil,
                          return_op: false, **kw)
       c = new_active_call(method, marshal, unmarshal, timeout)
-      md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
+      kw_with_jwt_uri = self.class.update_with_jwt_aud_uri(kw, @host, method)
+      md = @update_metadata.nil? ? kw : @update_metadata.call(kw_with_jwt_uri)
       return c.request_response(req, **md) unless return_op
 
       # return the operation view of the active_call; define #execute as a
@@ -204,7 +213,8 @@ module GRPC
     def client_streamer(method, requests, marshal, unmarshal, timeout = nil,
                         return_op: false, **kw)
       c = new_active_call(method, marshal, unmarshal, timeout)
-      md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
+      kw_with_jwt_uri = self.class.update_with_jwt_aud_uri(kw, @host, method)
+      md = @update_metadata.nil? ? kw : @update_metadata.call(kw_with_jwt_uri)
       return c.client_streamer(requests, **md) unless return_op
 
       # return the operation view of the active_call; define #execute as a
@@ -270,7 +280,8 @@ module GRPC
     def server_streamer(method, req, marshal, unmarshal, timeout = nil,
                         return_op: false, **kw, &blk)
       c = new_active_call(method, marshal, unmarshal, timeout)
-      md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
+      kw_with_jwt_uri = self.class.update_with_jwt_aud_uri(kw, @host, method)
+      md = @update_metadata.nil? ? kw : @update_metadata.call(kw_with_jwt_uri)
       return c.server_streamer(req, **md, &blk) unless return_op
 
       # return the operation view of the active_call; define #execute
@@ -375,7 +386,8 @@ module GRPC
     def bidi_streamer(method, requests, marshal, unmarshal, timeout = nil,
                       return_op: false, **kw, &blk)
       c = new_active_call(method, marshal, unmarshal, timeout)
-      md = @update_metadata.nil? ? kw : @update_metadata.call(kw.clone)
+      kw_with_jwt_uri = self.class.update_with_jwt_aud_uri(kw, @host, method)
+      md = @update_metadata.nil? ? kw : @update_metadata.call(kw_with_jwt_uri)
       return c.bidi_streamer(requests, **md, &blk) unless return_op
 
       # return the operation view of the active_call; define #execute
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index bfd0cbb393..072fb9b1aa 100644
--- a/src/ruby/lib/grpc/version.rb
+++ b/src/ruby/lib/grpc/version.rb
@@ -29,5 +29,5 @@
 
 # GRPC contains the General RPC module.
 module GRPC
-  VERSION = '0.6.0'
+  VERSION = '0.6.1'
 end
diff --git a/src/ruby/spec/channel_spec.rb b/src/ruby/spec/channel_spec.rb
index 31e38d71b8..d471ff5db6 100644
--- a/src/ruby/spec/channel_spec.rb
+++ b/src/ruby/spec/channel_spec.rb
@@ -58,7 +58,7 @@ describe GRPC::Core::Channel do
     it 'does not take a hash with bad values as channel args' do
       blk = construct_with_args(symbol: Object.new)
       expect(&blk).to raise_error TypeError
-      blk = construct_with_args('1' => Hash.new)
+      blk = construct_with_args('1' => {})
       expect(&blk).to raise_error TypeError
     end
 
diff --git a/src/ruby/spec/client_server_spec.rb b/src/ruby/spec/client_server_spec.rb
index 1a2afbe1f9..68af79f907 100644
--- a/src/ruby/spec/client_server_spec.rb
+++ b/src/ruby/spec/client_server_spec.rb
@@ -192,11 +192,11 @@ shared_examples 'GRPC metadata delivery works OK' do
   describe 'from client => server' do
     before(:example) do
       n = 7  # arbitrary number of metadata
-      diff_keys_fn = proc { |i| [sprintf('k%d', i), sprintf('v%d', i)] }
+      diff_keys_fn = proc { |i| [format('k%d', i), format('v%d', i)] }
       diff_keys = Hash[n.times.collect { |x| diff_keys_fn.call x }]
-      null_vals_fn = proc { |i| [sprintf('k%d', i), sprintf('v\0%d', i)] }
+      null_vals_fn = proc { |i| [format('k%d', i), format('v\0%d', i)] }
       null_vals = Hash[n.times.collect { |x| null_vals_fn.call x }]
-      same_keys_fn = proc { |i| [sprintf('k%d', i), [sprintf('v%d', i)] * n] }
+      same_keys_fn = proc { |i| [format('k%d', i), [format('v%d', i)] * n] }
       same_keys = Hash[n.times.collect { |x| same_keys_fn.call x }]
       symbol_key = { a_key: 'a val' }
       @valid_metadata = [diff_keys, same_keys, null_vals, symbol_key]
@@ -242,11 +242,11 @@ shared_examples 'GRPC metadata delivery works OK' do
   describe 'from server => client' do
     before(:example) do
       n = 7  # arbitrary number of metadata
-      diff_keys_fn = proc { |i| [sprintf('k%d', i), sprintf('v%d', i)] }
+      diff_keys_fn = proc { |i| [format('k%d', i), format('v%d', i)] }
       diff_keys = Hash[n.times.collect { |x| diff_keys_fn.call x }]
-      null_vals_fn = proc { |i| [sprintf('k%d', i), sprintf('v\0%d', i)] }
+      null_vals_fn = proc { |i| [format('k%d', i), format('v\0%d', i)] }
       null_vals = Hash[n.times.collect { |x| null_vals_fn.call x }]
-      same_keys_fn = proc { |i| [sprintf('k%d', i), [sprintf('v%d', i)] * n] }
+      same_keys_fn = proc { |i| [format('k%d', i), [format('v%d', i)] * n] }
       same_keys = Hash[n.times.collect { |x| same_keys_fn.call x }]
       symbol_key = { a_key: 'a val' }
       @valid_metadata = [diff_keys, same_keys, null_vals, symbol_key]
diff --git a/src/ruby/spec/generic/rpc_server_spec.rb b/src/ruby/spec/generic/rpc_server_spec.rb
index f409d73e2f..245999ea03 100644
--- a/src/ruby/spec/generic/rpc_server_spec.rb
+++ b/src/ruby/spec/generic/rpc_server_spec.rb
@@ -400,7 +400,8 @@ describe GRPC::RpcServer do
         end
         stub = EchoStub.new(@host, **@client_opts)
         expect(stub.an_rpc(req, k1: 'v1', k2: 'v2')).to be_a(EchoMsg)
-        wanted_md = [{ 'k1' => 'updated-v1', 'k2' => 'v2' }]
+        wanted_md = [{ 'k1' => 'updated-v1', 'k2' => 'v2',
+                       'jwt_aud_uri' => "https://#{@host}/EchoService" }]
         expect(service.received_md).to eq(wanted_md)
         @srv.stop
         t.join
diff --git a/src/ruby/spec/server_spec.rb b/src/ruby/spec/server_spec.rb
index a47e484f97..bb566d1b1f 100644
--- a/src/ruby/spec/server_spec.rb
+++ b/src/ruby/spec/server_spec.rb
@@ -152,7 +152,7 @@ describe Server do
     it 'does not take a hash with bad values as channel args' do
       blk = construct_with_args(symbol: Object.new)
       expect(&blk).to raise_error TypeError
-      blk = construct_with_args('1' => Hash.new)
+      blk = construct_with_args('1' => {})
       expect(&blk).to raise_error TypeError
     end
 
diff --git a/templates/Makefile.template b/templates/Makefile.template
index 331141fb24..73f7945074 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -96,6 +96,15 @@ CPPFLAGS_opt = -O2
 LDFLAGS_opt =
 DEFINES_opt = NDEBUG
 
+VALID_CONFIG_latprof = 1
+CC_latprof = $(DEFAULT_CC)
+CXX_latprof = $(DEFAULT_CXX)
+LD_latprof = $(DEFAULT_CC)
+LDXX_latprof = $(DEFAULT_CXX)
+CPPFLAGS_latprof = -O2 -DGRPC_LATENCY_PROFILER
+LDFLAGS_latprof =
+DEFINES_latprof = NDEBUG
+
 VALID_CONFIG_dbg = 1
 CC_dbg = $(DEFAULT_CC)
 CXX_dbg = $(DEFAULT_CXX)
diff --git a/test/core/profiling/timers_test.c b/test/core/profiling/timers_test.c
new file mode 100644
index 0000000000..55e59c969e
--- /dev/null
+++ b/test/core/profiling/timers_test.c
@@ -0,0 +1,83 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/profiling/timers.h"
+#include <stdlib.h>
+#include "test/core/util/test_config.h"
+
+void test_log_events(int num_seqs) {
+  int start = 0;
+  int *state;
+  state = calloc(num_seqs, sizeof(state[0]));
+  while (start < num_seqs) {
+    int i;
+    int row;
+    if (state[start] == 3) { /* Already done with this posn */
+      start++;
+      continue;
+    }
+
+    row = rand() % 10; /* how many in a row */
+    for (i = start; (i < start + row) && (i < num_seqs); i++) {
+      int j;
+      int advance = 1 + rand() % 3; /* how many to advance by */
+      for (j = 0; j < advance; j++) {
+        switch (state[i]) {
+          case 0:
+            GRPC_TIMER_MARK(STATE_0, i);
+            state[i]++;
+            break;
+          case 1:
+            GRPC_TIMER_MARK(STATE_1, i);
+            state[i]++;
+            break;
+          case 2:
+            GRPC_TIMER_MARK(STATE_2, i);
+            state[i]++;
+            break;
+          case 3:
+            break;
+        }
+      }
+    }
+  }
+  free(state);
+}
+
+int main(int argc, char **argv) {
+  grpc_test_init(argc, argv);
+  grpc_timers_log_global_init();
+  test_log_events(1000000);
+  grpc_timers_log_global_destroy();
+  return 0;
+}
diff --git a/tools/gce_setup/cloud_prod_runner.sh b/tools/gce_setup/cloud_prod_runner.sh
index e236c921ec..0389ac9dc1 100755
--- a/tools/gce_setup/cloud_prod_runner.sh
+++ b/tools/gce_setup/cloud_prod_runner.sh
@@ -32,21 +32,25 @@ thisfile=$(readlink -ne "${BASH_SOURCE[0]}")
 current_time=$(date "+%Y-%m-%d-%H-%M-%S")
 result_file_name=cloud_prod_result.$current_time.html
 echo $result_file_name
+log_link=https://pantheon.corp.google.com/m/cloudstorage/b/stoked-keyword-656-output/o/log_history
 
 main() {
   source grpc_docker.sh
   test_cases=(large_unary empty_unary ping_pong client_streaming server_streaming cancel_after_begin cancel_after_first_response)
   auth_test_cases=(service_account_creds compute_engine_creds jwt_token_creds)
-  clients=(cxx java go ruby node csharp_mono)
+  clients=(cxx java go ruby node csharp_mono python)
   for test_case in "${test_cases[@]}"
   do
     for client in "${clients[@]}"
     do
-      if grpc_cloud_prod_test $test_case grpc-docker-testclients $client
+      log_file_name=cloud_{$test_case}_{$client}.txt 
+      if grpc_cloud_prod_test $test_case grpc-docker-testclients $client > /tmp/$log_file_name 2>&1
       then
-        echo "          ['$test_case', '$client', 'prod', true]," >> /tmp/cloud_prod_result.txt
+        gsutil cp /tmp/$log_file_name gs://stoked-keyword-656-output/log_history/$log_file_name
+        echo "          ['$test_case', '$client', 'prod', true, '<a href="$log_link/$log_file_name">log</a>']," >> /tmp/cloud_prod_result.txt
       else
-        echo "          ['$test_case', '$client', 'prod', false]," >> /tmp/cloud_prod_result.txt
+        gsutil cp /tmp/$log_file_name gs://stoked-keyword-656-output/log_history/$log_file_name
+        echo "          ['$test_case', '$client', 'prod', false, '<a href="$log_link/$log_file_name">log</a>']," >> /tmp/cloud_prod_result.txt
       fi
     done
   done
@@ -54,11 +58,14 @@ main() {
   do
     for client in "${clients[@]}"
     do
-      if grpc_cloud_prod_auth_test $test_case grpc-docker-testclients $client
+      log_file_name=cloud_{$test_case}_{$client}.txt 
+      if grpc_cloud_prod_auth_test $test_case grpc-docker-testclients $client > /tmp/$log_file_name 2>&1
       then
-        echo "          ['$test_case', '$client', 'prod', true]," >> /tmp/cloud_prod_result.txt
+        gsutil cp /tmp/$log_file_name gs://stoked-keyword-656-output/log_history/$log_file_name
+        echo "          ['$test_case', '$client', 'prod', true, '<a href="$log_link/$log_file_name">log</a>']," >> /tmp/cloud_prod_result.txt
       else
-        echo "          ['$test_case', '$client', 'prod', false]," >> /tmp/cloud_prod_result.txt
+        gsutil cp /tmp/$log_file_name gs://stoked-keyword-656-output/log_history/$log_file_name    
+        echo "          ['$test_case', '$client', 'prod', false, '<a href="$log_link/$log_file_name">log</a>']," >> /tmp/cloud_prod_result.txt
       fi
     done
   done
@@ -69,6 +76,7 @@ main() {
     gsutil cp /tmp/cloud_prod_result.html gs://stoked-keyword-656-output/result_history/$result_file_name
     rm /tmp/cloud_prod_result.txt
     rm /tmp/cloud_prod_result.html
+    rm /tmp/cloud*.txt
   fi
 }
 
diff --git a/tools/gce_setup/grpc_docker.sh b/tools/gce_setup/grpc_docker.sh
index c68903b816..c8481c4211 100755
--- a/tools/gce_setup/grpc_docker.sh
+++ b/tools/gce_setup/grpc_docker.sh
@@ -1041,6 +1041,19 @@ grpc_interop_gen_python_cmd() {
   echo $the_cmd
 }
 
+# constructs the full dockerized python interop test cmd.
+#
+# call-seq:
+#   flags= .... # generic flags to include the command
+#   cmd=$($grpc_gen_test_cmd $flags)
+grpc_cloud_prod_gen_python_cmd() {
+  local cmd_prefix="sudo docker run grpc/python bin/bash -l -c"
+  local gfe_flags=$(_grpc_prod_gfe_flags)
+  local env_prefix="SSL_CERT_FILE=/cacerts/roots.pem"
+  local the_cmd="$cmd_prefix '$env_prefix python -B -m interop.client --use_tls $gfe_flags $@'"
+  echo $the_cmd
+}
+
 # constructs the full dockerized python service_account auth interop test cmd.
 #
 # call-seq:
@@ -1070,7 +1083,7 @@ grpc_cloud_prod_auth_compute_engine_creds_gen_python_cmd() {
   echo $the_cmd
 }
 
-# constructs the full dockerized java interop test cmd.
+# constructs the full dockerized ruby interop test cmd.
 #
 # call-seq:
 #   flags= .... # generic flags to include the command
@@ -1150,6 +1163,23 @@ grpc_cloud_prod_auth_compute_engine_creds_gen_ruby_cmd() {
   echo $the_cmd
 }
 
+# constructs the full dockerized ruby jwt_tokens auth interop test cmd.
+#
+# call-seq:
+#   flags= .... # generic flags to include the command
+#   cmd=$($grpc_gen_test_cmd $flags)
+grpc_cloud_prod_auth_jwt_token_creds_gen_ruby_cmd() {
+  local cmd_prefix="sudo docker run grpc/ruby bin/bash -l -c";
+  local test_script="/var/local/git/grpc/src/ruby/bin/interop/interop_client.rb"
+  local test_script+=" --use_tls"
+  local gfe_flags=$(_grpc_prod_gfe_flags)
+  local added_gfe_flags=$(_grpc_jwt_token_test_flags)
+  local env_prefix="SSL_CERT_FILE=/cacerts/roots.pem"
+  env_prefix+=" GOOGLE_APPLICATION_CREDENTIALS=/service_account/stubbyCloudTestingTest-7dd63462c60c.json"
+  local the_cmd="$cmd_prefix '$env_prefix ruby $test_script $gfe_flags $added_gfe_flags $@'"
+  echo $the_cmd
+}
+
 # constructs the full dockerized Go interop test cmd.
 #
 # call-seq:
diff --git a/tools/gce_setup/interop_test_runner.sh b/tools/gce_setup/interop_test_runner.sh
index 1c6122e9ae..b9f026e545 100755
--- a/tools/gce_setup/interop_test_runner.sh
+++ b/tools/gce_setup/interop_test_runner.sh
@@ -32,6 +32,7 @@ thisfile=$(readlink -ne "${BASH_SOURCE[0]}")
 current_time=$(date "+%Y-%m-%d-%H-%M-%S")
 result_file_name=interop_result.$current_time.html
 echo $result_file_name
+log_link=https://pantheon.corp.google.com/m/cloudstorage/b/stoked-keyword-656-output/o/log_history
 
 main() {
   source grpc_docker.sh
@@ -44,11 +45,14 @@ main() {
     do
       for server in "${servers[@]}"
       do
-        if grpc_interop_test $test_case grpc-docker-testclients $client grpc-docker-server $server
+        log_file_name=interop_{$test_case}_{$client}_{$server}.txt
+        if grpc_interop_test $test_case grpc-docker-testclients $client grpc-docker-server $server > /tmp/$log_file_name 2>&1
         then
-          echo "          ['$test_case', '$client', '$server', true]," >> /tmp/interop_result.txt
+          gsutil cp /tmp/$log_file_name gs://stoked-keyword-656-output/log_history/$log_file_name
+          echo "          ['$test_case', '$client', '$server', true, '<a href="$log_link/$log_file_name">log</a>']," >> /tmp/interop_result.txt
         else
-          echo "          ['$test_case', '$client', '$server', false]," >> /tmp/interop_result.txt
+          gsutil cp /tmp/$log_file_name gs://stoked-keyword-656-output/log_history/$log_file_name
+          echo "          ['$test_case', '$client', '$server', false, '<a href="$log_link/$log_file_name">log</a>']," >> /tmp/interop_result.txt
         fi
       done
     done
@@ -60,6 +64,7 @@ main() {
     gsutil cp /tmp/interop_result.html gs://stoked-keyword-656-output/result_history/$result_file_name
     rm /tmp/interop_result.txt
     rm /tmp/interop_result.html
+    rm /tmp/interop*.txt
   fi
 }
 
diff --git a/tools/gce_setup/post.html b/tools/gce_setup/post.html
index 57cbc8c369..2cea050c08 100644
--- a/tools/gce_setup/post.html
+++ b/tools/gce_setup/post.html
@@ -1,8 +1,7 @@
         ]);
 
         var table = new google.visualization.Table(document.getElementById('table_div'));
-
-        table.draw(data, {showRowNumber: true});
+        table.draw(data, {showRowNumber: true, allowHtml: true});
       }
     </script>
   </head>
diff --git a/tools/gce_setup/pre.html b/tools/gce_setup/pre.html
index 74ce5ce202..79aa8fa394 100644
--- a/tools/gce_setup/pre.html
+++ b/tools/gce_setup/pre.html
@@ -11,4 +11,5 @@
         data.addColumn('string', 'Client');
         data.addColumn('string', 'Server');
         data.addColumn('boolean', 'Pass');
+        data.addColumn('string', 'LogLink');
         data.addRows([
diff --git a/tools/run_tests/tests.json b/tools/run_tests/tests.json
index cb379863f1..c589320a2a 100644
--- a/tools/run_tests/tests.json
+++ b/tools/run_tests/tests.json
@@ -597,6 +597,15 @@
   {
     "flaky": false, 
     "language": "c", 
+    "name": "timers_test", 
+    "platforms": [
+      "windows", 
+      "posix"
+    ]
+  }, 
+  {
+    "flaky": false, 
+    "language": "c", 
     "name": "transport_metadata_test", 
     "platforms": [
       "windows", 
diff --git a/vsprojects/vs2010/Grpc.mak b/vsprojects/vs2010/Grpc.mak
index 727aa37781..93689a42af 100644
--- a/vsprojects/vs2010/Grpc.mak
+++ b/vsprojects/vs2010/Grpc.mak
@@ -53,10 +53,10 @@ grpc_test_util:
 $(OUT_DIR):
 	mkdir $(OUT_DIR)
 
-buildtests: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stats_store_test.exe census_stub_test.exe census_trace_store_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe dualstack_socket_test.exe echo_test.exe fd_posix_test.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_tls_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe transport_metadata_test.exe transport_security_test.exe 
+buildtests: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stats_store_test.exe census_stub_test.exe census_trace_store_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe dualstack_socket_test.exe echo_test.exe fd_posix_test.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_tls_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe timers_test.exe transport_metadata_test.exe transport_security_test.exe 
 	echo All tests built.
 
-test: alarm_heap_test alarm_list_test alarm_test alpn_test bin_encoder_test census_hash_table_test census_statistics_multiple_writers_circular_buffer_test census_statistics_multiple_writers_test census_statistics_performance_test census_statistics_quick_test census_statistics_small_log_test census_stats_store_test census_stub_test census_trace_store_test census_window_stats_test chttp2_status_conversion_test chttp2_stream_encoder_test chttp2_stream_map_test chttp2_transport_end2end_test dualstack_socket_test echo_test fd_posix_test fling_stream_test fling_test gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_tls_test gpr_useful_test grpc_base64_test grpc_byte_buffer_reader_test grpc_channel_stack_test grpc_completion_queue_test grpc_credentials_test grpc_json_token_test grpc_stream_op_test hpack_parser_test hpack_table_test httpcli_format_request_test httpcli_parser_test httpcli_test json_rewrite_test json_test lame_client_test message_compress_test metadata_buffer_test multi_init_test murmur_hash_test no_server_test poll_kick_posix_test resolve_address_test secure_endpoint_test sockaddr_utils_test tcp_client_posix_test tcp_posix_test tcp_server_posix_test time_averaged_stats_test time_test timeout_encoding_test transport_metadata_test transport_security_test 
+test: alarm_heap_test alarm_list_test alarm_test alpn_test bin_encoder_test census_hash_table_test census_statistics_multiple_writers_circular_buffer_test census_statistics_multiple_writers_test census_statistics_performance_test census_statistics_quick_test census_statistics_small_log_test census_stats_store_test census_stub_test census_trace_store_test census_window_stats_test chttp2_status_conversion_test chttp2_stream_encoder_test chttp2_stream_map_test chttp2_transport_end2end_test dualstack_socket_test echo_test fd_posix_test fling_stream_test fling_test gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_tls_test gpr_useful_test grpc_base64_test grpc_byte_buffer_reader_test grpc_channel_stack_test grpc_completion_queue_test grpc_credentials_test grpc_json_token_test grpc_stream_op_test hpack_parser_test hpack_table_test httpcli_format_request_test httpcli_parser_test httpcli_test json_rewrite_test json_test lame_client_test message_compress_test metadata_buffer_test multi_init_test murmur_hash_test no_server_test poll_kick_posix_test resolve_address_test secure_endpoint_test sockaddr_utils_test tcp_client_posix_test tcp_posix_test tcp_server_posix_test time_averaged_stats_test time_test timeout_encoding_test timers_test transport_metadata_test transport_security_test 
 	echo All tests ran.
 
 test_gpr: gpr_cancellable_test gpr_cmdline_test gpr_env_test gpr_file_test gpr_histogram_test gpr_host_port_test gpr_log_test gpr_slice_buffer_test gpr_slice_test gpr_string_test gpr_sync_test gpr_thd_test gpr_time_test gpr_tls_test gpr_useful_test 
@@ -702,6 +702,14 @@ timeout_encoding_test: timeout_encoding_test.exe
 	echo Running timeout_encoding_test
 	$(OUT_DIR)\timeout_encoding_test.exe
 
+timers_test.exe: grpc_test_util
+	echo Building timers_test
+	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\profiling\timers_test.c 
+	$(LINK) $(LFLAGS) /OUT:"$(OUT_DIR)\timers_test.exe" Debug\grpc_test_util.lib Debug\grpc.lib Debug\gpr_test_util.lib Debug\gpr.lib $(LIBS) $(OUT_DIR)\timers_test.obj 
+timers_test: timers_test.exe
+	echo Running timers_test
+	$(OUT_DIR)\timers_test.exe
+
 transport_metadata_test.exe: grpc_test_util
 	echo Building transport_metadata_test
 	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\transport\metadata_test.c 
diff --git a/vsprojects/vs2010/grpc.vcxproj b/vsprojects/vs2010/grpc.vcxproj
index 02d1f2643e..d18c33bf27 100644
--- a/vsprojects/vs2010/grpc.vcxproj
+++ b/vsprojects/vs2010/grpc.vcxproj
@@ -148,6 +148,8 @@
     <ClInclude Include="..\..\src\core\json\json_common.h" />
     <ClInclude Include="..\..\src\core\json\json_reader.h" />
     <ClInclude Include="..\..\src\core\json\json_writer.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h" />
     <ClInclude Include="..\..\src\core\statistics\census_interface.h" />
     <ClInclude Include="..\..\src\core\statistics\census_log.h" />
     <ClInclude Include="..\..\src\core\statistics\census_rpc_stats.h" />
@@ -336,6 +338,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\json\json_writer.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_log.c">
diff --git a/vsprojects/vs2010/grpc.vcxproj.filters b/vsprojects/vs2010/grpc.vcxproj.filters
index a010639ad1..7774a78040 100644
--- a/vsprojects/vs2010/grpc.vcxproj.filters
+++ b/vsprojects/vs2010/grpc.vcxproj.filters
@@ -223,6 +223,9 @@
     <ClCompile Include="..\..\src\core\json\json_writer.c">
       <Filter>src\core\json</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+      <Filter>src\core\profiling</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
       <Filter>src\core\statistics</Filter>
     </ClCompile>
@@ -569,6 +572,12 @@
     <ClInclude Include="..\..\src\core\json\json_writer.h">
       <Filter>src\core\json</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\core\statistics\census_interface.h">
       <Filter>src\core\statistics</Filter>
     </ClInclude>
@@ -716,6 +725,9 @@
     <Filter Include="src\core\json">
       <UniqueIdentifier>{e665cc0e-b994-d7c5-cc18-2007392019f0}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\profiling">
+      <UniqueIdentifier>{87674b72-0f05-0469-481a-bd8c7af9ad80}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\security">
       <UniqueIdentifier>{1d850ac6-e639-4eab-5338-4ba40272fcc9}</UniqueIdentifier>
     </Filter>
diff --git a/vsprojects/vs2010/grpc_unsecure.vcxproj b/vsprojects/vs2010/grpc_unsecure.vcxproj
index 651f38ae34..78d538b70e 100644
--- a/vsprojects/vs2010/grpc_unsecure.vcxproj
+++ b/vsprojects/vs2010/grpc_unsecure.vcxproj
@@ -132,6 +132,8 @@
     <ClInclude Include="..\..\src\core\json\json_common.h" />
     <ClInclude Include="..\..\src\core\json\json_reader.h" />
     <ClInclude Include="..\..\src\core\json\json_writer.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h" />
     <ClInclude Include="..\..\src\core\statistics\census_interface.h" />
     <ClInclude Include="..\..\src\core\statistics\census_log.h" />
     <ClInclude Include="..\..\src\core\statistics\census_rpc_stats.h" />
@@ -280,6 +282,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\json\json_writer.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_log.c">
diff --git a/vsprojects/vs2010/grpc_unsecure.vcxproj.filters b/vsprojects/vs2010/grpc_unsecure.vcxproj.filters
index 7757a44aec..cec8f78bae 100644
--- a/vsprojects/vs2010/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vs2010/grpc_unsecure.vcxproj.filters
@@ -163,6 +163,9 @@
     <ClCompile Include="..\..\src\core\json\json_writer.c">
       <Filter>src\core\json</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+      <Filter>src\core\profiling</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
       <Filter>src\core\statistics</Filter>
     </ClCompile>
@@ -461,6 +464,12 @@
     <ClInclude Include="..\..\src\core\json\json_writer.h">
       <Filter>src\core\json</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\core\statistics\census_interface.h">
       <Filter>src\core\statistics</Filter>
     </ClInclude>
@@ -605,6 +614,9 @@
     <Filter Include="src\core\json">
       <UniqueIdentifier>{443ffc61-1bea-2477-6e54-1ddf8c139264}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\profiling">
+      <UniqueIdentifier>{7f91d9bf-c9de-835a-d74d-b16f843b89a9}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\statistics">
       <UniqueIdentifier>{e084164c-a069-00e3-db35-4e0b1cd6f0b7}</UniqueIdentifier>
     </Filter>
diff --git a/vsprojects/vs2013/Grpc.mak b/vsprojects/vs2013/Grpc.mak
index c2c25ced69..1a96a2f3f8 100644
--- a/vsprojects/vs2013/Grpc.mak
+++ b/vsprojects/vs2013/Grpc.mak
@@ -55,7 +55,7 @@ $(OUT_DIR):
 
 buildtests: buildtests_c buildtests_cxx
 
-buildtests_c: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stub_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe echo_client.exe echo_server.exe echo_test.exe fd_posix_test.exe fling_client.exe fling_server.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_tls_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe transport_metadata_test.exe transport_security_test.exe 
+buildtests_c: alarm_heap_test.exe alarm_list_test.exe alarm_test.exe alpn_test.exe bin_encoder_test.exe census_hash_table_test.exe census_statistics_multiple_writers_circular_buffer_test.exe census_statistics_multiple_writers_test.exe census_statistics_performance_test.exe census_statistics_quick_test.exe census_statistics_small_log_test.exe census_stub_test.exe census_window_stats_test.exe chttp2_status_conversion_test.exe chttp2_stream_encoder_test.exe chttp2_stream_map_test.exe chttp2_transport_end2end_test.exe echo_client.exe echo_server.exe echo_test.exe fd_posix_test.exe fling_client.exe fling_server.exe fling_stream_test.exe fling_test.exe gpr_cancellable_test.exe gpr_cmdline_test.exe gpr_env_test.exe gpr_file_test.exe gpr_histogram_test.exe gpr_host_port_test.exe gpr_log_test.exe gpr_slice_buffer_test.exe gpr_slice_test.exe gpr_string_test.exe gpr_sync_test.exe gpr_thd_test.exe gpr_time_test.exe gpr_tls_test.exe gpr_useful_test.exe grpc_base64_test.exe grpc_byte_buffer_reader_test.exe grpc_channel_stack_test.exe grpc_completion_queue_test.exe grpc_credentials_test.exe grpc_json_token_test.exe grpc_stream_op_test.exe hpack_parser_test.exe hpack_table_test.exe httpcli_format_request_test.exe httpcli_parser_test.exe httpcli_test.exe json_rewrite.exe json_rewrite_test.exe json_test.exe lame_client_test.exe message_compress_test.exe metadata_buffer_test.exe multi_init_test.exe murmur_hash_test.exe no_server_test.exe poll_kick_posix_test.exe resolve_address_test.exe secure_endpoint_test.exe sockaddr_utils_test.exe tcp_client_posix_test.exe tcp_posix_test.exe tcp_server_posix_test.exe time_averaged_stats_test.exe time_test.exe timeout_encoding_test.exe timers_test.exe transport_metadata_test.exe transport_security_test.exe 
 	echo All tests built.
 
 buildtests_cxx: 
@@ -693,6 +693,14 @@ timeout_encoding_test: timeout_encoding_test.exe
 	echo Running timeout_encoding_test
 	$(OUT_DIR)\timeout_encoding_test.exe
 
+timers_test.exe: grpc_test_util $(OUT_DIR)
+	echo Building timers_test
+	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\profiling\timers_test.c 
+	$(LINK) $(LFLAGS) /OUT:"$(OUT_DIR)\timers_test.exe" Debug\grpc_test_util.lib Debug\grpc.lib Debug\gpr_test_util.lib Debug\gpr.lib $(LIBS) $(OUT_DIR)\timers_test.obj 
+timers_test: timers_test.exe
+	echo Running timers_test
+	$(OUT_DIR)\timers_test.exe
+
 transport_metadata_test.exe: grpc_test_util $(OUT_DIR)
 	echo Building transport_metadata_test
 	$(CC) $(CFLAGS) /Fo:$(OUT_DIR)\ ..\..\test\core\transport\metadata_test.c 
diff --git a/vsprojects/vs2013/grpc.vcxproj b/vsprojects/vs2013/grpc.vcxproj
index cb87334eab..4c7f0fad2e 100644
--- a/vsprojects/vs2013/grpc.vcxproj
+++ b/vsprojects/vs2013/grpc.vcxproj
@@ -150,6 +150,8 @@
     <ClInclude Include="..\..\src\core\json\json_common.h" />
     <ClInclude Include="..\..\src\core\json\json_reader.h" />
     <ClInclude Include="..\..\src\core\json\json_writer.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h" />
     <ClInclude Include="..\..\src\core\statistics\census_interface.h" />
     <ClInclude Include="..\..\src\core\statistics\census_log.h" />
     <ClInclude Include="..\..\src\core\statistics\census_rpc_stats.h" />
@@ -338,6 +340,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\json\json_writer.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_log.c">
diff --git a/vsprojects/vs2013/grpc.vcxproj.filters b/vsprojects/vs2013/grpc.vcxproj.filters
index a010639ad1..7774a78040 100644
--- a/vsprojects/vs2013/grpc.vcxproj.filters
+++ b/vsprojects/vs2013/grpc.vcxproj.filters
@@ -223,6 +223,9 @@
     <ClCompile Include="..\..\src\core\json\json_writer.c">
       <Filter>src\core\json</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+      <Filter>src\core\profiling</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
       <Filter>src\core\statistics</Filter>
     </ClCompile>
@@ -569,6 +572,12 @@
     <ClInclude Include="..\..\src\core\json\json_writer.h">
       <Filter>src\core\json</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\core\statistics\census_interface.h">
       <Filter>src\core\statistics</Filter>
     </ClInclude>
@@ -716,6 +725,9 @@
     <Filter Include="src\core\json">
       <UniqueIdentifier>{e665cc0e-b994-d7c5-cc18-2007392019f0}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\profiling">
+      <UniqueIdentifier>{87674b72-0f05-0469-481a-bd8c7af9ad80}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\security">
       <UniqueIdentifier>{1d850ac6-e639-4eab-5338-4ba40272fcc9}</UniqueIdentifier>
     </Filter>
diff --git a/vsprojects/vs2013/grpc_unsecure.vcxproj b/vsprojects/vs2013/grpc_unsecure.vcxproj
index 098ce340c1..a31d82aa5f 100644
--- a/vsprojects/vs2013/grpc_unsecure.vcxproj
+++ b/vsprojects/vs2013/grpc_unsecure.vcxproj
@@ -134,6 +134,8 @@
     <ClInclude Include="..\..\src\core\json\json_common.h" />
     <ClInclude Include="..\..\src\core\json\json_reader.h" />
     <ClInclude Include="..\..\src\core\json\json_writer.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers.h" />
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h" />
     <ClInclude Include="..\..\src\core\statistics\census_interface.h" />
     <ClInclude Include="..\..\src\core\statistics\census_log.h" />
     <ClInclude Include="..\..\src\core\statistics\census_rpc_stats.h" />
@@ -282,6 +284,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\json\json_writer.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_log.c">
diff --git a/vsprojects/vs2013/grpc_unsecure.vcxproj.filters b/vsprojects/vs2013/grpc_unsecure.vcxproj.filters
index 7757a44aec..cec8f78bae 100644
--- a/vsprojects/vs2013/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vs2013/grpc_unsecure.vcxproj.filters
@@ -163,6 +163,9 @@
     <ClCompile Include="..\..\src\core\json\json_writer.c">
       <Filter>src\core\json</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\profiling\timers.c">
+      <Filter>src\core\profiling</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\statistics\census_init.c">
       <Filter>src\core\statistics</Filter>
     </ClCompile>
@@ -461,6 +464,12 @@
     <ClInclude Include="..\..\src\core\json\json_writer.h">
       <Filter>src\core\json</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\core\profiling\timers_preciseclock.h">
+      <Filter>src\core\profiling</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\core\statistics\census_interface.h">
       <Filter>src\core\statistics</Filter>
     </ClInclude>
@@ -605,6 +614,9 @@
     <Filter Include="src\core\json">
       <UniqueIdentifier>{443ffc61-1bea-2477-6e54-1ddf8c139264}</UniqueIdentifier>
     </Filter>
+    <Filter Include="src\core\profiling">
+      <UniqueIdentifier>{7f91d9bf-c9de-835a-d74d-b16f843b89a9}</UniqueIdentifier>
+    </Filter>
     <Filter Include="src\core\statistics">
       <UniqueIdentifier>{e084164c-a069-00e3-db35-4e0b1cd6f0b7}</UniqueIdentifier>
     </Filter>