Implement support for multiple garbage slots#14

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peterzhu2118 wants to merge 47 commits intomasterfrom

pz-multi-garbage

Commits on Oct 6, 2020

Allocate garbage

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Fix gc_verify_heap_page loop

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Fix bug

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Hack?

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Clean up hack

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Fix GC compaction

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Add bitmap for garbage slots

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Bring back the sweep mark bit optimisation
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Hack to estimate the number of slots we will be freeing

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Fix accounting of freed objects

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Correctly account for heap_pages_final_slots so it does not underflow

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Fix logic used to check if there is enough space for garbage slots

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Make garbage allocation play nice with ASan
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Don't double count the free slots
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expose garbage slots in GC.stat
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Fix ASan in objspace_each_objects_without_setup

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move the repoisoning to encompass all the reads on this memory
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Repoisoning `val` should be the last thing we do here
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Minor changes, mostly added some assertions

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Fix compiler warning

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.

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Fix compiler error

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Increase test timeout

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Skip test instead

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Clean ups

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remove unused variable
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introduce GET_NEXT_RVALUE and replace uses
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Fix Warnings when RGENGC_CHECK_MODE = 1
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Skip ractor tests

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Remove pooled_pages

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Implement new freelist structure

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Optimize freeing objects

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Optimize allocating objects

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Use free pages before triggering a GC in allocation slow path

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Debug

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Try new RVALUE_SAME_PAGE_P

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Fix ASan

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Fix requested_bin?

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Set page to NULL

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Fix free page prepare and refactors

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Fix GC.verify_internal_consistency

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Implement some TODOs

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Fix ObjectSpace.count_objects

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WIP - allocate iseq body on GC heap

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This isn't failing on local, let's try on CI
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Fix leaked global test failure
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fixup bad rebase
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