Ruby Issue Tracking System

Today

02:39 AM Ruby Feature #22067: New TypedData bit to allow the type to be freed in parallel

luke-gru (Luke Gruber) wrote in #note-5:
> ... some others said they've seen problematic mark functions in some extensions (reading/mutating global state, etc.) ...
jhawthorn (John Hawthorn) wrote in #note-6:
> ...
Yes. That's exac... wks (Kunshan Wang)

05/13/2026

11:40 AM Ruby Feature #22067: New TypedData bit to allow the type to be freed in parallel

If I read correctly, this proposal is about improving the performance of sweeping by running `obj_free` of TypedData concurrently with mutators. But I think this does not change a fact that the TypedData is still subject to finalization... wks (Kunshan Wang)

07/24/2025

03:37 PM Ruby Revision 5ef20b3a (git): YJIT: Use raw memory write to update pointers in code

Because we have set all code memory to writable before the reference
updating phase, we can use raw memory writes directly. wks (Kunshan Wang)

07/22/2025

02:05 PM Ruby Revision 0f408602 (git): Fix missing increment of deleted_entries

When `rb_concurrent_set_foreach_with_replace` deletes entries from a
concurrent set, it should increment the `deleted_entries` field, too. wks (Kunshan Wang)

07/14/2025

08:21 PM Ruby Revision 51a3ea5a (git): YJIT: Set code mem permissions in bulk

Some GC modules, notably MMTk, support parallel GC, i.e. multiple GC
threads work in parallel during a GC. Currently, when two GC threads
scan two iseq objects simultaneously when YJIT is enabled, both threads
will attempt to borrow `Co... wks (Kunshan Wang)

08:21 PM Ruby Revision 3a47f4ea (git): YJIT: Move RefCell one level down

This is the second part of making YJIT work with parallel GC.
During GC, `rb_yjit_iseq_mark` and `rb_yjit_iseq_update_references` need
to resolve offsets in `Block::gc_obj_offsets` into absolute addresses
before reading or updating the ... wks (Kunshan Wang)

05/30/2025

02:55 PM Ruby Revision 94688bdc (git): [ruby/mmtk] Fix clippy warnings and formatting.

We also enable `#![warn(unsafe_op_in_unsafe_fn)]` in the whole mmtk_ruby
crate.
https://github.com/ruby/mmtk/commit/8b8025f71a wks (Kunshan Wang)

02:55 PM Ruby Revision d2a1ad00 (git): [ruby/mmtk] Fix environment variable parsing

Ues more idiomatic rust approaches.
https://github.com/ruby/mmtk/commit/ef125f9eae wks (Kunshan Wang)

02:55 PM Ruby Revision 60de513d (git): [ruby/mmtk] Remove unused constant

Remove the unused constant HAS_MOVED_GFIELDSTBL and related methods.
In the mmtk/mmtk-ruby repo, we are now able to find the global field
(IV) table of a moved object during copying GC without using the
HAS_MOVED_GFIELDSTBL bit. We syn... wks (Kunshan Wang)

02:55 PM Ruby Revision d8774ec9 (git): [ruby/mmtk] Bump MMTk and dependencies version

https://github.com/ruby/mmtk/commit/de252637ec wks (Kunshan Wang)