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Add section about the design of CPython's garbage collector #562

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Merged
merged 28 commits into from
Jan 21, 2020
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Add section about the design of CPython's garbage collector #562

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Add section about the design of CPython's garbage collector
pablogsal Jan 20, 2020
8aac485
Fix several typos
pablogsal Jan 20, 2020
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Update garbage_collector.rst
pablogsal Jan 20, 2020
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pablogsal Jan 20, 2020
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pablogsal Jan 20, 2020
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pablogsal Jan 20, 2020
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pablogsal Jan 20, 2020
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pablogsal Jan 20, 2020
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Update garbage_collector.rst
pablogsal Jan 20, 2020
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pablogsal Jan 20, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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Fix indentation and rework incomplete sentence
pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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Rework sentence about _gc_prev
pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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Add a warning section regarding tagged pointers
pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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pablogsal Jan 21, 2020
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Update garbage_collector.rst 
Co-Authored-By: Tim Peters <tim.peters@gmail.com>
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@pablogsal @tim-one
pablogsal and tim-one authored Jan 21, 2020
commit e956478573438f4ab826547dfb35b6a36cf5b836
2 changes: 1 addition & 1 deletion garbage_collector.rst
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Expand Up @@ -409,7 +409,7 @@ The CPython GC makes use of two fat pointers:
* The ``_gc_next`` field is used as the "next" pointer to maintain the doubly
linked list but during collection its lowest bit is used to keep the
``NEXT_MASK_UNREACHABLE`` flag that indicates if an object is tentatively
unreachable during the cycle detection algorithm.
unreachable during the cycle detection algorithm. This is a drawback to using only doubly linked lists to implement partitions: while most needed operations are constant-time, there is no efficient way to determine which partition an object is currently in. Instead, when that's needed, ad hoc tricks (like the ``NEXT_MASK_UNREACHABLE`` flag) are employed.

Optimization: delay tracking containers
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