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95 lines
3.2 KiB
Plaintext
95 lines
3.2 KiB
Plaintext
SportModel To-Do List
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- Make page manager initialize pages to all zeros
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- remove fancy object initialization from alloc routines
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- java needs all fields to be zeroed, not just pointers
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- need to zero objects when copying occurs too
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- Implement weak ref support
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- new types
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- weak array
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- weak (open) hashtable
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- stack of objects with weak refs
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- on stack overflow, mark weak fields instead
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- if mark stack also overflows... !
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- routine to drain weak ref stack (done at end of gc)
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- if object, use weak ref field descriptors
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- if array, null out unmarked objects
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- need heuristic for disposing them
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- wait for java 1.2 spec for sun.misc.WeakRef
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- Implement open hash-tables
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- needed?
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- must be primitive (with custom scavenge routine) because
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keys & values are intermixed in same object
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- Sort out public vs. private info in header files
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- Add ability to explicitly lock and unlock objects for JS
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- Make Mac deal with multiple segments
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- i.e. grow page and card tables
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- need to stop app threads at safe points (non write barrier
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boundaries)
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- need to not be in a piece of code holding the address of a
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page desc (a lock in gc)
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- Unix page manager
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- 16 and 64 bit support
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- Add splay trees to page manager to find clusters faster
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- profile for large-object intensive allocations
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- Add blacklist support to page manager
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- blacklist bit already set for pages
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- Figure out locking strategy
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- currently Collect0 is not protected!
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- need notion of "processor"?
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- VirtualAlloc/Free on a per-page basis is too frequent
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- institute large blocks in the page manager?
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- add a better caching strategy
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- add a memory pressure api
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- Change SMPage* to SMPageNum throughout
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- conservative references are being found to pages
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- these look like refs to the first object on the page
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- Implement demographic feedback mediated tenuring policy
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- Implement segmented arrays for win16
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- not needed anymore with Greg's 32-bit win3.1?
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- Profiling
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- always more to do
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- Memory visualization tools
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- Add multi-processor support
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- introduce multiple youngest generations
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- need nspr notion of a "processor" to associate a youngest
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generation with (gating factor)
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- change allocation apis to specify a generation to allocate
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in
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- add allocation lock per youngest generation for concurrent
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allocation/collection
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- add lock for promotion to second generation during copying
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- fix write-barrier code to scan other youngest generation
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spaces for incoming pointers
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- Integration with EF
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- on gcbranch2 of ns/electricalfire
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- need build-time flag to determine whether class objects are
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scavenged or not
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- yes for EF
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- need union type for pointer/non-pointer?
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- low-order tag bit for pointers
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- only 31 bits of data!
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- unify with dereference operation
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- ambiguous field descriptors in class
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