From: "tmm1 (Aman Gupta)" <ruby@...1.net>
Date: 2013-12-02T13:59:06+09:00
Subject: [ruby-core:58778] [ruby-trunk - Feature #9190] Expose serial helper	macros


Issue #9190 has been updated by tmm1 (Aman Gupta).


I would like to see these exposed as well. They provide visibility into VM behavior, and are very useful for measuring how many constant or method table invalidations are happening in large applications.
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Feature #9190: Expose serial helper macros
https://bugs.ruby-lang.org/issues/9190#change-43347

Author: simeonwillbanks (Simeon Willbanks)
Status: Feedback
Priority: Normal
Assignee: 
Category: core
Target version: 


I've defined RubyVM::InstructionHelper with singleton methods #method_serial and #constant_serial.  They delegate to helper macros GET_METHOD_SERIAL() and GET_CONSTANT_SERIAL().

With these methods, users have visibility into the method and constant caches.  If it makes sense, I hope this patch is included in Ruby 2.1.0.

def constants_busted?(&blk)
  starting = RubyVM::InstructionHelper.constant_serial
  yield
  ending = RubyVM::InstructionHelper.constant_serial
  ending > starting
end

busted = constants_busted? do
  class Foo; end
end
puts busted.inspect
# true 

https://github.com/ruby/ruby/pull/462.patch

Thanks for considering; any input is appreciated!


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