Issues

• Fix MAX_SPACES and SFTSpaceMap index calculation

  mmtk/mmtk-core#1619 · Filter by author wks opened on Oct 19, 2026
  1

• Field unlog bits granularity (pointer size, or compressed ptr)

  C-bug
  mmtk/mmtk-core#1615 · Filter by author qinsoon opened on Oct 12, 2026
  2

• Clarify our assumptions/definitions on Slot

  mmtk/mmtk-core#1611 · Filter by author qinsoon opened on Oct 8, 2026
  4

• StickyImmix disregards defrag headroom during nursery evacuation

  mmtk/mmtk-core#1590 · Filter by author wks opened on Sep 14, 2026
  1

• Remove the hack about the block/non-block behavior for null tls in harness_begin/handle_user_collection_request

  C-bug
  mmtk/mmtk-core#1585 · Filter by author qinsoon opened on Sep 14, 2026

• Required LXR changes for Julia

  C-bug
  mmtk/mmtk-core#1574 · Filter by author qinsoon opened on Aug 31, 2026

• Mutator performance regression on fop

  C-regression
  mmtk/mmtk-core#1561 · Filter by author qinsoon opened on Aug 24, 2026

• Dimpsey et al./IBM style bitwise mark-sweep

  A-allocatorA-gc-algorithmC-featureF-project
  mmtk/mmtk-core#1557 · Filter by author no-defun-allowed opened on Aug 19, 2026
  2

• Split traits (Plan, Space, etc.) by accessibility, dispatch, etc.

  A-generalC-refactoringG-safety
  mmtk/mmtk-core#1555 · Filter by author wks opened on Aug 19, 2026

• meta: Cleanup to do after merging lxr-x/simplified

  mmtk/mmtk-core#1553 · Filter by author wks opened on Aug 17, 2026
  1

• Bump MSRV to a stable version that supports Edition 2024.

  mmtk/mmtk-core#1552 · Filter by author qinsoon opened on Aug 17, 2026

• Refactor AllocationSemantics

  A-allocator
  mmtk/mmtk-core#1543 · Filter by author k-sareen opened on Aug 3, 2026

• RegionPageResource double-counts newly allocated pages

  A-heapC-bug
  mmtk/mmtk-core#1541 · Filter by author no-defun-allowed opened on Jul 31, 2026
  1

• When to call Mmapper::ensure_mapped?

  mmtk/mmtk-core#1518 · Filter by author wks opened on Jun 29, 2026
  1

• Native MarkSweepSpace doesn't support in-header mark bits.

  mmtk/mmtk-core#1512 · Filter by author wks opened on Jun 18, 2026
  1

• Use the MarkState in ImmixSpace and LOS

  mmtk/mmtk-core#1511 · Filter by author wks opened on Jun 17, 2026
  4

• meta: Features needed by LXR but not implemented in master yet

  mmtk/mmtk-core#1509 · Filter by author wks opened on Jun 5, 2026
  1

• GCWork::do_work should own self

  mmtk/mmtk-core#1506 · Filter by author wks opened on Jun 2, 2026

• Concurrent worker threads

  A-work-queueC-enhancement
  mmtk/mmtk-core#1500 · Filter by author qinsoon opened on May 25, 2026

• Remove "double enqueuing" (a.k.a. dual-queue)

  mmtk/mmtk-core#1496 · Filter by author wks opened on May 18, 2026

• Concurrent and STW tracing GC should use the same set of work packets for tracing

  mmtk/mmtk-core#1495 · Filter by author wks opened on May 18, 2026

• Meta: Refactors after replacing ProcessEdgesWork with Trace

  mmtk/mmtk-core#1494 · Filter by author wks opened on May 18, 2026

• Can we pass TraceKind to trace_object by value without losing performance?

  mmtk/mmtk-core#1492 · Filter by author wks opened on Apr 30, 2026
  1

• eBPF: Declare USDT probes in one place

  A-toolsC-refactoring
  mmtk/mmtk-core#1490 · Filter by author wks opened on Apr 30, 2026

• Remove NullableObjectReference

  mmtk/mmtk-core#1489 · Filter by author wks opened on Apr 22, 2026