rails3 patch for perftools.rb cpu/object profiling

gistfile1.diff

diff --git a/Gemfile b/Gemfile
index fd90d42..9dd0146 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,6 @@
 source 'http://rubygems.org'
+gem 'perftools.rb', '>= 0.4.4'
+gem 'rack-perftools_profiler'
 
 gem 'rails', '3.0.0.rc'
 
diff --git a/config/application.rb b/config/application.rb
index 1900eaf..484a7b9 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -38,5 +38,26 @@ module Foobar
 
     # Configure sensitive parameters which will be filtered from the log file.
     config.filter_parameters += [:password]
+
+    # Enable object allocation profiling
+    #
+    #   $ RAILS_ENV=production ./script/rails server
+    #
+    #   $ curl http://localhost:3000/__start__
+    #   $ curl http://localhost:3000/home
+    #   $ curl http://localhost:3000/about
+    #   $ curl http://localhost:3000/__stop__
+    #   $ curl http://localhost:3000/__data__ -o profile.gif
+    #   $ curl http://localhost:3000/__data__?printer=text -o profile.txt
+    #
+    #   $ curl "http://localhost:3000/home?profile=true&times=10&printer=gif" -o 10_requests_to_homepage.gif
+    #
+    STDERR.puts '*** perftools.rb object allocation profiling is enabled (this will impact performance)'
+
+    ENV['CPUPROFILE_OBJECTS'] = '1' # remove this to do CPU profiling instead (much lower overhead)
+    config.cache_classes = true     # avoid unnecessary objects
+
+    require 'rack/perftools_profiler'
+    config.middleware.insert 0, Rack::PerftoolsProfiler, :default_printer => 'gif'
   end
 end