[ruby-core:107856] [Ruby master Bug#18394] Backports for read barrier for GC compaction for Ruby 3.0

Issue #18394 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED to 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE

ruby_3_0 3ce60f44b8de3aabb31c37d2afd2a622a64a3e6f merged revision(s) 0130e17a410d60a10e7041ce98748b8de6946971,32b7dcfb56a417c1d1c354102351fc1825d653bf,79cc566ab4cdf75f125ecf413a27d353a9756c08.

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Bug #18394: Backports for read barrier for GC compaction for Ruby 3.0
https://bugs.ruby-lang.org/issues/18394#change-96795

* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Priority: Normal
* Backport: 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE
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Please backport commits [0130e17a410d60a10e7041ce98748b8de6946971](https://github.com/ruby/ruby/commit/0130e17a410d60a10e7041ce98748b8de6946971) and [32b7dcfb56a417c1d1c354102351fc1825d653bf](https://github.com/ruby/ruby/commit/32b7dcfb56a417c1d1c354102351fc1825d653bf) to Ruby 3.0.

The read barrier is required for both manual and automatic compaction. Not setting up the read barrier can cause crashes such as #18133.

Edit:

In addition to the two commits above, please also backport the attached patch. The attached patch switches `posix_memalign` to `mmap` for allocation of pages.


---Files--------------------------------
mmap.patch (11.1 KB)


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