If !RCLASS_EXT_EMBEDDED (e.g. 32 bit systems) then the rb_classext_t is allocated throug malloc so it must be freed.
The issue can be seen in the following script:
20.times do 100_000.times do mod = Module.new Class.new do include mod end end # Output the Resident Set Size (memory usage, in KB) of the current Ruby process puts `ps -o rss= -p #{$$}` end
Before this fix, the max RSS is 280MB, while after this change, it's 30MB.
Related issues
Bug #19550: Memory leak in iclass for 32 bit systems
Added by peterzhu2118 (Peter Zhu) over 2 years ago
Fix memory leak for iclass
[Bug #19550]
If !RCLASS_EXT_EMBEDDED (e.g. 32 bit systems) then the rb_classext_t is
allocated throug malloc so it must be freed.
The issue can be seen in the following script:
Before this fix, the max RSS is 280MB, while after this change, it's
30MB.