diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index c07ba2ac74c9d0cbe939afa840bb8f61bd3468a4..c103fcccf7a9ebd8b032690e082f0e8168872e7a 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -34,11 +34,13 @@ class AbstractAdapter
       include QueryCache
       include ActiveSupport::Callbacks
 
+      attr_accessor :runtime
       define_callbacks :checkout, :checkin
 
       def initialize(connection, logger = nil) #:nodoc:
         @active = nil
         @connection, @logger = connection, logger
+        @runtime = 0
         @query_cache_enabled = false
         @query_cache = {}
       end
@@ -89,6 +91,11 @@ def prefetch_primary_key?(table_name = nil)
         false
       end
 
+      def reset_runtime #:nodoc:
+        rt, @runtime = @runtime, 0
+        rt
+      end
+
       # QUOTING ==================================================
 
       # Override to return the quoted table name. Defaults to column quoting.
diff --git a/activerecord/lib/active_record/log_subscriber.rb b/activerecord/lib/active_record/log_subscriber.rb
index c7ae12977a1fc0a9014794b6e73da027512fd88e..d7b99d796d342168f64b174883daed8cd5042a52 100644
--- a/activerecord/lib/active_record/log_subscriber.rb
+++ b/activerecord/lib/active_record/log_subscriber.rb
@@ -1,25 +1,12 @@
 module ActiveRecord
   class LogSubscriber < ActiveSupport::LogSubscriber
-    def self.runtime=(value)
-      Thread.current["active_record_sql_runtime"] = value
-    end
-
-    def self.runtime
-      Thread.current["active_record_sql_runtime"] ||= 0
-    end
-
-    def self.reset_runtime
-      rt, self.runtime = runtime, 0
-      rt
-    end
-
     def initialize
       super
       @odd_or_even = false
     end
 
     def sql(event)
-      self.class.runtime += event.duration
+      connection.runtime += event.duration
       return unless logger.debug?
 
       name = '%s (%.1fms)' % [event.payload[:name], event.duration]
@@ -39,10 +26,14 @@ def odd?
       @odd_or_even = !@odd_or_even
     end
 
+    def connection
+      ActiveRecord::Base.connection
+    end
+
     def logger
       ActiveRecord::Base.logger
     end
   end
 end
 
-ActiveRecord::LogSubscriber.attach_to :active_record
\ No newline at end of file
+ActiveRecord::LogSubscriber.attach_to :active_record
diff --git a/activerecord/lib/active_record/railties/controller_runtime.rb b/activerecord/lib/active_record/railties/controller_runtime.rb
index bc6ca936c0f0669474b0b23788d4023d317c0281..aed1c59b004dedc3b925ac43d72997648302aa92 100644
--- a/activerecord/lib/active_record/railties/controller_runtime.rb
+++ b/activerecord/lib/active_record/railties/controller_runtime.rb
@@ -11,9 +11,9 @@ module ControllerRuntime
 
       def cleanup_view_runtime
         if ActiveRecord::Base.connected?
-          db_rt_before_render = ActiveRecord::LogSubscriber.reset_runtime
+          db_rt_before_render = ActiveRecord::Base.connection.reset_runtime
           runtime = super
-          db_rt_after_render = ActiveRecord::LogSubscriber.reset_runtime
+          db_rt_after_render = ActiveRecord::Base.connection.reset_runtime
           self.db_runtime = db_rt_before_render + db_rt_after_render
           runtime - db_rt_after_render
         else
diff --git a/activerecord/test/cases/log_subscriber_test.rb b/activerecord/test/cases/log_subscriber_test.rb
index cbaaca764b965cd91b0bc861ad41ca7b37ddd255..342daa19df339e8433986fc68558c3031ac1f869 100644
--- a/activerecord/test/cases/log_subscriber_test.rb
+++ b/activerecord/test/cases/log_subscriber_test.rb
@@ -57,8 +57,4 @@ def test_cached_queries_doesnt_log_when_level_is_not_debug
     wait
     assert_equal 0, @logger.logged(:debug).size
   end
-
-  def test_initializes_runtime
-    Thread.new { assert_equal 0, ActiveRecord::LogSubscriber.runtime }.join
-  end
 end