Bug #18394: Backports for read barrier for GC compaction for Ruby 3.0

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED

[peterzhu2118 (Peter Zhu)]

Please backport commits 0130e17a410d60a10e7041ce98748b8de6946971 and 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.

[peterzhu2118 (Peter Zhu)]

• Description updated (diff)
• File mmap.patch added

[peterzhu2118 (Peter Zhu)]

• File deleted (mmap.patch)

[peterzhu2118 (Peter Zhu)]

• File mmap.patch mmap.patch added

[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.

[vo.x (Vit Ondruch)]

• Related to Bug #18746: /TestGCCompact#test_(ast_compacts|compact_count|complex_hash_keys|gc_compact_stats)/ fails on PPC added

[peterzhu2118 (Peter Zhu)]

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

Changing the backport status of Ruby 3.0 to "REQUIRED" again because it doesn't look like the attached patched was applied.