MMTk 0.31.0

0.31.0 (2025-04-17)

What's Changed

Plan

• Remove dead trace_object methods. by @wks in #1277
• implement mutator builder by @tianleq in #1287
• Fix incongruent defaults for copying GCs by @k-sareen in #1296

Policy

• Clear stale line mark state by @tianleq in #1268
• Ensure log bits are correctly maintained by @k-sareen in #1169

Scheduler

• Make work packet buffer size configurable from one location by @k-sareen in #1285
• Make EDGES_WORK_BUFFER_SIZE constant public to bindings by @k-sareen in #1291

CI

• Fix Clippy warning in 1.84.0 by @wks in #1262
• Fix julia extended tests by @qinsoon in #1270
• Fix to bytemuck_derive 1.8.1 by @qinsoon in #1288
• Fix lychee command by @wks in #1286
• Fix clippy warnings for Rust 1.86 by @wks in #1297
• Properly handle multiple plans in GITHUB-CI in CI scripts by @qinsoon in #1301

Documentation

• Special topic chapter for finalizers and weak references by @wks in #1265
• User Guide chapter for address-based hashing by @wks in #1294

Misc

• Move to Rust 1.83 by @qinsoon in #1253
• Unique object enqueuing option by @wks in #1255
• Fix a subtraction overflow in get_free_pages. by @wks in #1261
• Force fixed heap size when using NoGC by @wks in #1264
• Make GC triggering and heap resizing consistent by @wks in #1266
• Bump MSRV to 1.74.1 by @wks in #1276
• Fix clippy warning about operator precedence by @wks in #1280
• Fixing MSRV-breaking dependencies by @wks in #1284
• Check if an object is in our heap before using VM map during counting live bytes by @qinsoon in #1289
• Aggregate live bytes info in on_gc_finished by @qinsoon in #1292
• Fix broken stats gathering code if no. of GCs > MAX_PHASES by @k-sareen in #1295
• Fix contiguous chunk iterator in monotonic PR by @wks in #1299

Full Changelog: v0.30.0...v0.31.0

MMTk 0.30.0

0.30.0 (2024-12-20)

What's Changed

Policy

• Allow setting object metadata for VM space objects. Expose VO bit under a feature. by @qinsoon in #1248

Misc

• Fix clippy warnings for Rust 1.83 by @wks in #1242
• Annotate mmap ranges using PR_SET_VMA by @wks in #1236
• Fix warnings for lifetime in MmapAnnotation impl by @qinsoon in #1244
• Collect live bytes per space, and report by space by @qinsoon in #1238
• Minor changes for debugging. by @wks in #1245
• Use macos-15 for style check by @qinsoon in #1249
• Check the option before aggregating live bytes data. Panic if the option is enabled on malloc space. by @qinsoon in #1250

Full Changelog: v0.29.0...v0.30.0

MMTk 0.29.0

0.29.0 (2024-11-08)

What's Changed

CI

• Install cargo-msrv using stable toolchain. by @wks in #1215
• Update CI macos image by @qinsoon in #1216
• Performance history canary by @wks in #1209
• Change the default testing branch for Julia tests by @qinsoon in #1221
• Fix auto merge branches by @qinsoon in #1230

Documentation

• Document the policy about performance testing environment and epochs by @qinsoon in #1206

Misc

• Fix a race between forwarding bits and VO bits. by @wks in #1214
• Remove space for nogc link by @Pat-Lafon in #1217
• Make env_logger an optional dependency by @wks in #1226
• Use modern syntax for optional dependencies by @wks in #1229
• Fix nightly build and add inline attributes to {un,}likely by @k-sareen in #1228

New Contributors

• @Pat-Lafon made their first contribution in #1217

Full Changelog: v0.28.0...v0.29.0

MMTk 0.28.0

0.28.0 (2024-09-27)

What's Changed

API

• Require ObjectReference to point inside object by @wks in #1195
• Return if a GC ran or not for handle_user_collection_request by @k-sareen in #1205

CI

• Update ci-perf-kit to 0.7.6 by @qinsoon in #1199
• Update ci-perf-kit to plot epoch by @qinsoon in #1208

Misc

• Skip iterating through unallocated memory for MonotonePageResource by @k-sareen in #1189
• Fix find_last_non_zero_bit, and align metadata address before converting to data address. by @qinsoon in #1188
• Panic message and outdated comments by @wks in #1191
• Filter the result for find_prev_non_zero_value_fast to make sure it is in the search range by @qinsoon in #1192
• Assert OBJECT_REF_OFFSET_LOWER_BOUND invariant by @wks in #1194
• Minor fixes by @wks in #1196
• Add a feature immix_stress_copying by @qinsoon in #1202
• Update migration guide for #1205 by @qinsoon in #1211

Full Changelog: v0.27.0...v0.28.0

MMTk 0.27.0

0.27.0 (2024-08-09)

What's Changed

Policy

• Clear pin bits by @udesou in #1166
• Set the unlog bits for objects in the bootimage by @k-sareen in #1168
• Fix bug in line mark when MARK_LINE_AT_SCAN_TIME=false by @k-sareen in #1171

API

• Require object reference to be aligned by @qinsoon in #1159
• Internal pointer support by @qinsoon in #1165
• Heap traversal by @wks in #1174

CI

• Parallelize and workaround CI style checks by @wks in #1184

Misc

• Extensible eBPF timeline attributes by @wks in #1162
• Only map with executable permissions when using code space by @k-sareen in #1176
• Fix style check for Rust 1.80 by @qinsoon in #1178
• Extra assertions for mutators and epilogues by @wks in #1182
• Refactor iterate_meta_bits by @wks in #1181

Full Changelog: v0.26.0...v0.27.0

MMTk 0.26.0

0.26.0 (2024-07-01)

What's Changed

Policy

• Clear side forwarding bits properly by @wks in #1138
• Fix mark bit clearing in PrepareChunkMap by @wks in #1148
• Let MarkSweepSpace use BlockPageResource by @wks in #1150
• Add SweepChunk to native MarkSweepSpace by @wks in #1158

API

• Rename edge to slot by @wks in #1134

Documentation

• Fix broken link and stale descriptions in doc by @wks in #1139
• API migration guide. by @wks in #1133
• Add back DummyVM as a part of the porting guide. Minor changes to MMTk initialization in the porting guide. by @qinsoon in #1142
• Fix broken link to mmtk.h by @wks in #1149

Misc

• Fix clippy warnings for Rust 1.79 by @wks in #1151
• Display number of slots in timeline visualization by @wks in #1154

Full Changelog: v0.25.0...v0.26.0

MMTk 0.25.0

0.25.0 (2024-05-17)

What's Changed

Plan

• Allow roots to be pinned for StickyImmix nursery collections by @k-sareen in #1108
• Check FULL_NURSERY_GC for StickyImmix as well by @k-sareen in #1124

Policy

• Remove data race for marksweep block lists by @qinsoon in #1112

Scheduler

• Remove coordinator and support forking by @wks in #1067

API

• Allow nursery size to be proportional to the heap size by @qinsoon in #1087
• Remove NULL ObjectReference by @wks in #1064
• Fix write barrier parameter type by @wks in #1130
• Allow querying if the current GC may move objects. by @wks in #1128

CI

• Use host toolchain and explicit target in CI script by @wks in #1109
• Fix ignores in merge check by @qinsoon in #1117
• Fix the openjdk test name in merge check by @qinsoon in #1119

Misc

• Bump dependencies after version 0.24 by @wks in #1105
• Don't use PROT_EXEC with mmap on macos by @eileencodes in #1110
• Rename associated types in GCWorkContext by @wks in #1116
• Add missing pinning metadata to mock_vm by @wks in #1121
• Use to_address for SFT access by @wks in #1122
• Ensure reference objects are either traced or cleared by @wks in #1126
• Dump process map on mmap failure and fix typos by @k-sareen in #1127
• Fix compiler errors and warnings for Rust 1.78.0 by @wks in #1132
• Remove fl_map and refactor FreeListPageResoure by @wks in #953

New Contributors

• @eileencodes made their first contribution in #1110

Full Changelog: v0.24.0...v0.25.0

MMTk 0.24.0

0.24.0 (2024-04-08)

What's Changed

Misc

• Check and fix broken links in docs by @qinsoon in #1085
• Allow binding to implement GC trigger by @qinsoon in #1083
• Resolve issues for unit tests on 32 bits by @qinsoon in #1095
• Use SFTDenseChunkMap on 64bits when vm_space is enabled by @qinsoon in #1094
• Fix warnings with the stable Rust toolchain by @wks in #1099
• Use proper logging for the treadmill by @wks in #1101

Full Changelog: v0.23.0...v0.24.0

MMTk 0.23.0

0.23.0 (2024-02-09)

What's Changed

API

• Ask from binding if GC is disabled by @udesou in #1075

CI

• Stop using the deprecated set-output in our CI configs by @qinsoon in #1059
• Rename CI tests to minimal/extended tests by @qinsoon in #1073
• Properly get PR number for merge group by @qinsoon in #1077

Misc

• MMTk Enhancement Proposal by @wks in #1056
• Timeline visualization tool by @wks in #1022
• Add a document for project principles by @qinsoon in #1069
• Fix un-cleared VO bits for contiguous monotone PR by @wks in #1071
• Use live memory to estimate collection pages in mem balancer by @qinsoon in #1050
• Fix issues in sanity GC by @qinsoon in #1079

Full Changelog: v0.22.1...v0.23.0

MMTk 0.22.1

0.22.1 (2024-01-11)

What's Changed

• Revert a mistake in v0.22 that prevents cargo publish by @qinsoon in #1065

Full Changelog: v0.22.0...v0.22.1