[ruby-core:65304] [ruby-trunk - Feature #10238] todo: remove dependency on malloc_usable_size

Issue #10238 has been updated by Nobuyoshi Nakada.


If it's a `Fixnum`, the size should be 0 for NULL `ptr`.

`enc_memsize` seems unnecessary anyway, indeed.

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Feature #10238: todo: remove dependency on malloc_usable_size
https://bugs.ruby-lang.org/issues/10238#change-49125

* Author: Eric Wong
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: Next Major
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malloc_usable_size shows up at or near the top of many profiles for me.

We should be able to use ruby_sized_xfree in more places; especially
if rb_data_type_t->dsize is defined.

One possible improvement is to allow the rb_data_type_t->dsize pointer
to be a FIXNUM, removing the need for some memsize functions.

Furthermore, over-accounting malloc-ed bytes (presumably the reason
malloc_usable_size was introduced). should be less harmful nowadays with
incremental marking.




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