Rails 4.0.3 with TracePoint on Ruby 2.1.1 (MRI)

boot.rb

##### Rails app: config/boot.rb Added by VaskoZ
@stats = {}
@tp = TracePoint.trace(:a_call) do |tp|
  @stats[tp.defined_class] ||= {}
  @stats[tp.defined_class][tp.method_id] ||= 0
  @stats[tp.defined_class][tp.method_id] += 1
end
@tp.enable
##### End VaskoZ changes
# Set up gems listed in the Gemfile.
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)

require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])

hello_controller.rb

###### Rails app: app/controllers/hello_controller.rb
class HelloController < ApplicationController
  def index
    TOPLEVEL_BINDING.eval('@tp.disable')
    stats = TOPLEVEL_BINDING.eval('@stats')
    render text: "#{markup_stats(stats)}"
  end

  def start
    TOPLEVEL_BINDING.eval('@stats.clear')
    TOPLEVEL_BINDING.eval('@tp.enable')
    render text: "<h1>TracePoint started!!!</h1>"
  end

  def stop
    TOPLEVEL_BINDING.eval('@tp.disable')
    stats = TOPLEVEL_BINDING.eval('@stats')
    render text: "#{markup_stats(stats)}"
  end

  private
  def markup_stats(stats)
    html = "<h1>#{stats.keys.size} classes used</h1>"
    html += "<h1>#{stats.map{|k,v| v.keys}.flatten.size} methods used</h1>"
    html += "<h1>#{stats.map{|k,v| v.values}.flatten.sum} methods dispatched</h1>"
    html += "<br><br>#{stats.inspect}"
  end
end

routes.rb

##### Rails app: config/routes.rb
Easy::Application.routes.draw do
  get '/start', to: 'hello#start'
  get '/stop', to: 'hello#stop'
  get '/', to: 'hello#index'
end