Issue #6199 has been reported by funny_falcon (Yura Sokolov).

----------------------------------------
Feature #6199: Organize gc.c a bit
https://bugs.ruby-lang.org/issues/6199

Author: funny_falcon (Yura Sokolov)
Status: Open
Priority: Normal
Assignee: authorNari (Narihiro Nakamura)
Category: core
Target version: 2.0.0


1. Move immutable fields from struct heaps_slot and struct sorted_heaps_slot into struct heaps_header.
   One exception is limit field, but it starts to be mutable just before freeing a heaps_header, so that it is not big issue.
2. Embed bitmap into struct heaps_slot
3. Change `free_unused_heaps` to `free_unused_heap`, so that it will not be called on every GC round, but only when page should be freed.
   While `free_unused_heaps` does not consume much time (it is invisible in profiler), but regular application has no need in calling this function every time.

https://github.com/ruby/ruby/pull/108
https://github.com/ruby/ruby/pull/108.patch


-- 
http://bugs.ruby-lang.org/