From: Eric Wong <normalperson@...>
Date: 2018-02-06T02:13:44+00:00
Subject: [ruby-core:85431] Re: [Ruby trunk Feature#14370] Directly mark instruction operands and avoid mark_ary usage on rb_iseq_constant_body

tenderlove@ruby-lang.org wrote:
>   https://gist.githubusercontent.com/tenderlove/f7fe6e09d6f9cacd3299abdd39fb65b7/raw/9b7dd3718278f7be0eb18bedf94590573e313ab2/resize_array.diff

> Unfortunately this patch also made more calls to malloc / free
> in order to allocate the smaller array.  Maybe there is a way
> to do this in-place?

Not really.  At least I do not recall malloc implementations
being optimized for shrinking smaller allocations with realloc.
For multi-page allocations, there's mremap(2), so it's not
appropriate for most Ruby arrays (and also Linux-specific).

Anyways, I like the rest of your changes to remove mark_ary
and flagging markability.

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