From: Eric Wong <normalperson@...>
Date: 2018-06-07T10:30:17+00:00
Subject: [ruby-core:87441] Re: [Ruby trunk Feature#14767] [PATCH] gc.c: use monotonic counters for objspace_malloc_increase

I wrote:
> I think the original unsigned + underflow avoidance code
> prevented us from accounting free() properly, and we were
> triggering GC more as a result.

(Warning: thinking out loud while sleep-deprived)

What's dangerous about this patch correcting the
free()-before-malloc() accounting is that it not only breaks
expectations with our current malloc limits; everybody who sets
custom limits in env also gets things broken.

So, I'm not sure what to do about it...

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