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cpython/Objects
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Sam Gross c012c8ab7b
gh-115103: Delay reuse of mimalloc pages that store PyObjects (#115435) 
This implements the delayed reuse of mimalloc pages that contain Python
objects in the free-threaded build.

Allocations of the same size class are grouped in data structures called
pages. These are different from operating system pages. For thread-safety, we
want to ensure that memory used to store PyObjects remains valid as long as
there may be concurrent lock-free readers; we want to delay using it for
other size classes, in other heaps, or returning it to the operating system.

When a mimalloc page becomes empty, instead of immediately freeing it, we tag
it with a QSBR goal and insert it into a per-thread state linked list of
pages to be freed. When mimalloc needs a fresh page, we process the queue and
free any still empty pages that are now deemed safe to be freed. Pages
waiting to be freed are still available for allocations of the same size
class and allocating from a page prevent it from being freed. There is
additional logic to handle abandoned pages when threads exit.
2024-03-06 09:42:11 -05:00
..
clinic gh-112075: Accessing a single element should optimistically avoid locking (#115109) 2024-02-20 17:08:14 -08:00
mimalloc gh-115103: Delay reuse of mimalloc pages that store PyObjects (#115435) 2024-03-06 09:42:11 -05:00
stringlib gh-110964: Remove private _PyArg functions (#110966) 2023-10-17 14:30:31 +02:00
abstract.c gh-116316: Fix typo in UNARY_FUNC(PyNumber_Positive) macros (GH-116317) 2024-03-04 17:57:01 +00:00
boolobject.c gh-111999: Add signatures and improve docstrings for builtins (GH-112000) 2023-11-13 09:13:49 +02:00
bytearrayobject.c gh-115323: Add meaningful error message for using bytearray.extend with str (#115332) 2024-02-24 18:34:45 -05:00
bytes_methods.c gh-104922: remove PY_SSIZE_T_CLEAN (#106315) 2023-07-02 15:07:46 +09:00
bytesobject.c gh-108767: Replace ctype.h functions with pyctype.h functions (#108772) 2023-09-01 18:36:53 +02:00
call.c gh-106320: Remove _PyFunction_Vectorcall() API (#107071) 2023-07-22 21:44:33 +00:00
capsule.c gh-108240: Add pycore_capsule.h internal header file (#108596) 2023-08-29 01:20:02 +00:00
cellobject.c gh-110964: Remove private _PyArg functions (#110966) 2023-10-17 14:30:31 +02:00
classobject.c gh-113157 gh-89519: Fix method descriptors (gh-113233) 2023-12-21 16:08:35 -06:00
codeobject.c GH-114695: Add sys._clear_internal_caches (GH-115152) 2024-02-12 09:04:36 +00:00
complexobject.c gh-109598: make PyComplex_RealAsDouble/ImagAsDouble use __complex__ (GH-109647) 2024-01-15 16:04:17 +01:00
descrobject.c gh-101860: Expose __name__ on property (GH-101876) 2024-02-20 17:14:34 +02:00
dictnotes.txt bpo-46845: Reduce dict size when all keys are Unicode (GH-31564) 2022-03-02 08:09:28 +09:00
dictobject.c gh-112075: Enable freeing with qsbr and fallback to lock on key changed (GH-116336) 2024-03-05 09:08:18 +00:00
enumobject.c gh-106320: Create pycore_modsupport.h header file (#106355) 2023-07-03 09:39:11 +00:00
exception_handling_notes.txt GH-105848: Simplify the arrangement of CALL's stack (GH-107788) 2023-08-09 18:19:39 +00:00
exceptions.c gh-114570: Add PythonFinalizationError exception (#115352) 2024-02-14 23:35:06 +01:00
fileobject.c gh-82626: Emit a warning when bool is used as a file descriptor (GH-111275) 2024-02-05 22:51:11 +02:00
floatobject.c gh-111968: Split _Py_dictkeys_freelist out of _Py_dict_freelist (gh-115505) 2024-02-16 01:01:36 +00:00
frame_layout.md gh-109094: replace frame->prev_instr by frame->instr_ptr (#109095) 2023-10-26 13:43:10 +00:00
frameobject.c gh-113939: Frame clear, clear locals (#113940) 2024-01-31 19:14:44 +00:00
funcobject.c gh-114312: Collect stats for unlikely events (GH-114493) 2024-01-25 11:10:51 +00:00
genericaliasobject.c gh-110964: Remove private _PyArg functions (#110966) 2023-10-17 14:30:31 +02:00
genobject.c gh-111968: Split _Py_async_gen_asend_freelist out of _Py_async_gen_fr… (gh-115546) 2024-02-17 10:03:10 +09:00
interpreteridobject.c gh-101524: Only Use Public C-API in the _xxsubinterpreters Module (gh-107359) 2023-07-27 15:30:16 -06:00
iterobject.c gh-106320: Remove private _PyEval function (#108433) 2023-08-24 20:25:22 +02:00
listobject.c gh-112087: Update list_get_item_ref to optimistically avoid locking (gh-116353) 2024-03-06 08:21:33 +09:00
listsort.txt Fix typos in the Objects directory (GH-28766) 2021-10-06 16:57:10 -07:00
lnotab_notes.txt Document the co_lines method on code objects (#113682) 2024-01-03 19:29:24 +00:00
locations.md GH-88116: Use a compact format to represent end line and column offsets. (GH-91666) 2022-04-21 16:10:37 +01:00
longobject.c gh-115827: Fix compile warning in longobject.c (#115828) 2024-02-22 17:57:12 +00:00
memoryobject.c gh-111178: Avoid calling functions from incompatible pointer types in memoryobject.c (GH-112863) 2023-12-11 17:43:07 +01:00
methodobject.c gh-114626: add PyCFunctionFast and PyCFunctionFastWithKeywords (GH-114627) 2024-02-15 11:05:20 +01:00
moduleobject.c gh-95754: Better AttributeError on partially initialised module (#112577) 2023-12-21 13:24:10 -08:00
namespaceobject.c gh-110964: Remove private _PyArg functions (#110966) 2023-10-17 14:30:31 +02:00
object.c gh-115491: Keep some fields valid across allocations in obmalloc (free-threading) (#115745) 2024-02-21 10:00:08 -08:00
object_layout.md gh-106293: Fix typos in Objects/object_layout.md (#106294) 2024-01-16 23:11:15 +00:00
object_layout_312.gv GH-96068: Document object layout (GH-96069) 2022-08-23 13:55:43 +01:00
object_layout_312.png GH-96068: Document object layout (GH-96069) 2022-08-23 13:55:43 +01:00
object_layout_full_312.gv GH-96068: Document object layout (GH-96069) 2022-08-23 13:55:43 +01:00
object_layout_full_312.png GH-96068: Document object layout (GH-96069) 2022-08-23 13:55:43 +01:00
obmalloc.c gh-115103: Delay reuse of mimalloc pages that store PyObjects (#115435) 2024-03-06 09:42:11 -05:00
odictobject.c gh-112075: Add critical sections for most dict APIs (#114508) 2024-02-06 14:03:43 -08:00
picklebufobject.c gh-104922: remove PY_SSIZE_T_CLEAN (#106315) 2023-07-02 15:07:46 +09:00
rangeobject.c gh-106320: Remove private _PyEval function (#108433) 2023-08-24 20:25:22 +02:00
README
setobject.c gh-112069: Adapt set/frozenset methods to Argument Clinic (#115112) 2024-02-08 17:47:27 +01:00
sliceobject.c gh-111968: Rename freelist related struct names to Eric's suggestion (gh-115329) 2024-02-14 00:32:51 +00:00
structseq.c GH-108362: Revert "GH-108362: Incremental GC implementation (GH-108038)" (#115132) 2024-02-07 12:38:34 +00:00
tupleobject.c gh-111968: Split _Py_dictkeys_freelist out of _Py_dict_freelist (gh-115505) 2024-02-16 01:01:36 +00:00
typeobject.c gh-116296: Fix refleak in reduce_newobj() corner case (#116297) 2024-03-04 09:46:18 +00:00
typeslots.inc bpo-41073: PyType_GetSlot() can now accept static types. (GH-21931) 2020-11-10 12:53:46 -08:00
typeslots.py bpo-41073: PyType_GetSlot() can now accept static types. (GH-21931) 2020-11-10 12:53:46 -08:00
typevarobject.c gh-110864: TypeVar constructor: Partially revert gh-110784, constraints cannot be NULL (#110922) 2023-10-16 15:01:04 +00:00
unicodectype.c bpo-46670: Remove unused macros in the Objects directory (GH-31193) 2022-02-07 16:21:41 +01:00
unicodeobject.c gh-112066: Use PyDict_SetDefaultRef in place of PyDict_SetDefault. (#112211) 2024-02-07 13:43:18 -05:00
unicodetype_db.h gh-96954: Fix make regen-unicodedata in out-of-tree builds (#112118) 2023-11-15 16:42:17 +00:00
unionobject.c gh-108511: Add C API functions which do not silently ignore errors (GH-109025) 2023-09-17 14:23:31 +03:00
weakrefobject.c gh-106320: Remove private _PyErr_ChainExceptions() (#108713) 2023-08-31 13:53:19 +02:00

README 

Source files for various builtin objects