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MMTk 0.8.0

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@qinsoon qinsoon released this 01 Nov 22:54
· 366 commits to master since this release
v0.8.0
8e50e2c
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Learn about vigilant mode.

GC Plans

  • Added schedule_common() to schedule the common work packets for all the plans.
  • Added proepr implementation for checking and triggering full heap collection for all the plans.
  • Fixed a bug that collection triggers were not properly cleared after a GC.
  • Fixed a bug that objects in generational copying's or semispace's tospace were traced.

Policies

  • Added a parameter roots: bool to ProcessEdgesWork::new() to indicate whether the packet contains root edges.
  • Refactored ImmixProcessEdges.trace_object() so it can deal with both defrag GC and fast GC.
  • Fixed a bug in Immix that recyclable blocks were not defragment source which could cause OOM without attempting
    to evacuate recyclable blocks.
  • Fixed a bug that nursery large objects had their unlogged bits set, and were treated as mature objects.
  • Fixed a bug that SFT entries were not set for MallocSpace.
  • Fixed a bug that SFT entries may not be correctly set if the start address is not chunk aligned.

Allocators

  • Supported proper stress test for all the allocators.
  • Supported proper alignment and offset for MallocAllocator.

API

  • (Breaking change) Renamed enable_collection() to initialize_collection().
  • Added enable_collection() and disable_collection(). When MMTk collection is disabled, MMTk allows allocation without
    triggering GCs.
  • Added COORDINATOR_ONLY_STW to the Collection trait. If this is set, the StopMutators work can only done by the MMTk
    coordinator thread. Otherwise, any GC thread may be used to stop mutators.

Misc

  • Added assertions in extreme_assertions to check if side metadata access is within their bounds.
  • Added SideMetadataSpec.name to help debug.
  • Added a macro in util::metadata::side_metadata::spec_defs to help define side metadata specs without
    explicitly laying out specs and providing offsets for each spec.
  • Renamed SideMetadataSpec.log_min_obj_size to SideMetadataSpec.log_bytes_in_region to avoid ambiguity.
  • Fixed some issues and outdated code in the MMTk tutorial.
  • Fixed a bug that may cause incorrect perf event values.
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