From: SASADA Koichi <ko1@...>
Date: 2013-10-04T10:24:07+09:00
Subject: [ruby-core:57652] Re: [ruby-trunk - Bug #8983] [PATCH] GC.stat[:heap_free_num] returns number of unused slots on heap

(2013/10/04 10:09), tmm1 (Aman Gupta) wrote:
> I understand the slot is removed, but `objspace_live_num` includes unfinalized objects so I included them in `heap_limit` also.
> 
> Otherwise, `objspace->heap.limit - objspace_live_num(objspace)` can become negative.

I got it.

objspace_live_num() should return the count including zombie (waiting to
finallization) because they are still living (living dead!!).

However, we can eliminate zombiees from live_num() because they are not
living normal objects.

Two approachs?

(1) eliminate zombies from live_num

(2) count zombie_num

(objspace->heap.limit -
  (objspace_live_num(objspace) - zombie_num)

-- 
// SASADA Koichi at atdot dot net