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MMTk 0.5.0

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@qinsoon qinsoon released this 28 Jun 02:15
· 436 commits to master since this release
v0.5.0
a849906
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Learn about vigilant mode.

GC Plans

  • Added a new plan PageProtect, a plan to help debugging. It allocates each object
    to a separate page, and protects pages when the pages are released.

API

  • Major changes to the ObjectModel trait: now a binding must specify each per-object
    metadata used by mmtk-core, whether the metadata resides in header bits provided
    by the VM or side tables provided by mmtk-core. For in-header metadata, a binding
    can further implement how it can be accessed, in case the bits are not always available
    to mmtk-core.

Misc

  • Refactored metadata to provide unified access to per-object metadata (in-header or side).
  • Refactored work packet statistics to allow other types of stats other than execution times.
  • Added the feature 'perf_counter' and the option 'perf_events' to collect data from hardware performance counters for work packets.
  • 'extreme_assertions' now also checks if values stored in side metadata are correct.
  • Fixed a bug that GenCopy may report OOM without doing a full heap GC.
  • Fixed a bug that existing mmapping of side metadata memory may get overwritten.
  • Fixed a bug that FreeListPageResource may return an incorrect new_chunk flag for the first allocation.
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