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Neil Schemenauer 5c16f699d2
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[3.13] GH-133136: Revise QSBR to reduce excess memory held (gh-135473) (gh-136480) 
The free threading build uses QSBR to delay the freeing of dictionary
keys and list arrays when the objects are accessed by multiple threads
in order to allow concurrent reads to proceed with holding the object
lock. The requests are processed in batches to reduce execution
overhead, but for large memory blocks this can lead to excess memory
usage.

Take into account the size of the memory block when deciding when to
process QSBR requests.

Also track the amount of memory being held by QSBR for mimalloc pages.
Advance the write sequence if this memory exceeds a limit.  Advancing
the sequence will allow it to be freed more quickly.

Process the held QSBR items from the "eval breaker", rather than from
`_PyMem_FreeDelayed()`.  This gives a higher chance that the global read
sequence has advanced enough so that items can be freed.

(cherry picked from commit 113de8545f)

Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>
Co-authored-by: Sam Gross <colesbury@gmail.com>
2025-07-30 11:06:44 -07:00
..
cpython [3.13] gh-136759: revert rename lock.h to pylock.h (GH-137041) (#137075) (#137166) 2025-07-28 12:19:32 +00:00
internal [3.13] GH-133136: Revise QSBR to reduce excess memory held (gh-135473) (gh-136480) 2025-07-30 11:06:44 -07:00
abstract.h [3.13] gh-134989: Implement PyObject_DelAttr() as a macro in the limited C API (GH-135021) (#135134) 2025-06-04 17:10:51 +02:00
bltinmodule.h
boolobject.h [3.13] gh-134989: Fix Py_RETURN_NONE in the limited C API (GH-135165) (#135182) 2025-06-05 15:02:09 +00:00
bytearrayobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
bytesobject.h gh-108765: Move standard includes to Python.h (#108769) 2023-09-01 21:03:20 +02:00
ceval.h gh-74929: Implement PEP 667 (GH-115153) 2024-05-04 12:12:10 +01:00
codecs.h Remove private _PyCodec_Lookup() function (#106269) 2023-06-30 09:34:01 +00:00
compile.h gh-109596: Ensure repeated rules in the grammar are not allowed and fix incorrect soft keywords (#109606) 2023-09-22 19:03:23 +01:00
complexobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
critical_section.h [3.13] gh-119344: Make critical section API public (GH-119353) (#120856) 2024-06-21 20:20:41 +00:00
datetime.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
descrobject.h gh-103509: PEP 697 -- Limited C API for Extending Opaque Types (GH-103511) 2023-05-04 09:56:53 +02:00
dictobject.h gh-106004: PyDict_GetItemRef() should only be in the limited API 3.13 (GH-107229) 2023-07-25 21:48:07 +03:00
dynamic_annotations.h gh-96959: Update HTTP links which are redirected to HTTPS (GH-96961) 2022-09-24 14:38:53 +03:00
enumobject.h
errcode.h gh-107450: Check for overflow in the tokenizer and fix overflow test (#110832) 2023-10-16 16:42:49 +02:00
exports.h gh-108765: Move export code from pyport.h to exports.h (#108855) 2023-09-04 01:04:05 +02:00
fileobject.h gh-106320: Remove _PyIsSelectable_fd() C API (#107142) 2023-07-23 19:07:12 +00:00
fileutils.h gh-108765: Move stat() fiddling from pyport.h to fileutils.h (#108854) 2023-09-03 21:32:13 +00:00
floatobject.h [3.13] gh-121905: Consistently use "floating-point" instead of "floating point" (GH-121907) (GH-122012) 2024-07-19 09:13:08 +00:00
frameobject.h bpo-45434: Remove useless space in includes (GH-28963) 2021-10-15 01:50:04 +02:00
genericaliasobject.h bpo-44654: Refactor and clean up the union type implementation (GH-27196) 2021-07-17 22:44:10 +03:00
import.h gh-105922: Add PyImport_AddModuleRef() function (#105923) 2023-06-20 08:48:14 +02:00
intrcheck.h gh-106320: Remove private _PyOS_IsMainThread() function (#108605) 2023-08-29 03:20:31 +00:00
iterobject.h gh-106320: Remove _PyAnextAwaitable_Type from the public C API (#108597) 2023-08-29 02:05:11 +00:00
listobject.h gh-114329: Fix PyList_GetItemRef() limited C API definition (#117520) 2024-04-03 21:02:42 +00:00
lock.h [3.13] gh-136759: revert rename lock.h to pylock.h (GH-137041) (#137075) (#137166) 2025-07-28 12:19:32 +00:00
longobject.h gh-117021: Fix integer overflow in PyLong_AsPid() on non-Windows 64-bit platforms (GH-117064) 2024-03-20 15:39:53 +02:00
marshal.h bpo-45474: Exclude all of marshal.h if Py_LIMITED_API is defined (GH-29061) 2021-10-20 02:32:14 -07:00
memoryobject.h gh-79315: Add Include/cpython/memoryobject.h header (#99723) 2022-11-23 15:44:42 +01:00
methodobject.h gh-114626: Add again _PyCFunctionFastWithKeywords name (GH-115561) 2024-02-19 13:20:46 +01:00
modsupport.h [3.13] gh-112136: Restore removed _PyArg_Parser (GH-121262) (#121344) 2024-07-03 18:29:00 +00:00
moduleobject.h gh-116322: Rename PyModule_ExperimentalSetGIL to PyUnstable_Module_SetGIL (GH-118645) 2024-05-06 18:59:36 +02:00
monitoring.h gh-111997: C-API for signalling monitoring events (#116413) 2024-05-04 08:23:50 +00:00
object.h [3.13] gh-134989: Fix Py_RETURN_NONE in the limited C API (GH-135165) (#135182) 2025-06-05 15:02:09 +00:00
objimpl.h gh-102013: Move PyUnstable_GC_VisitObjects() to Include/cpython/objimpl.h (#115560) 2024-02-16 15:49:13 +01:00
opcode.h gh-105481: opcode.h is no longer generated during the build (#108080) 2023-08-17 17:07:58 +01:00
opcode_ids.h GH-118095: Use broader specializations of CALL in tier 1, for better tier 2 support of calls. (GH-118322) 2024-05-04 12:11:11 +01:00
osdefs.h gh-108765: Reformat Include/osdefs.h (#108766) 2023-09-01 14:35:39 +00:00
osmodule.h
patchlevel.h Post 3.13.5 2025-06-11 23:32:50 +02:00
py_curses.h [3.13] bpo-44172: Keep reference to original window in curses subwindow objects (GH-26226) (GH-133370) 2025-05-04 11:15:43 +00:00
pyatomic.h gh-108724: Add PyMutex and _PyParkingLot APIs (gh-109344) 2023-09-19 09:54:29 -06:00
pybuffer.h gh-102500: Implement PEP 688 (#102521) 2023-05-04 07:59:46 -07:00
pycapsule.h gh-108240: Add pycore_capsule.h internal header file (#108596) 2023-08-29 01:20:02 +00:00
pydtrace.d
pydtrace.h Fix pydtrace.d path comment in Include/pydtrace.h (#28539) 2022-12-31 22:40:25 +05:30
pyerrors.h [3.13] gh-119521: Rename IncompleteInputError to _IncompleteInputError and remove from public API/ABI (GH-119680, GH-120955) (GH-120944) 2024-06-24 20:23:30 +02:00
pyexpat.h gh-115398: Revert PyExpat_CAPI_MAGIC version bump (GH-116411) 2024-03-06 09:55:07 -08:00
pyframe.h gh-93937, C API: Move PyFrame_GetBack() to Python.h (#93938) 2022-06-19 12:02:33 +02:00
pyhash.h gh-111545: Add Include/cpython/pyhash.h header file (#112063) 2023-11-15 01:19:20 +01:00
pylifecycle.h gh-117987: Restore several functions removed in Python 3.13 alpha 1 (GH-117993) 2024-04-18 15:20:38 +02:00
pymacconfig.h gh-110820: Make sure processor specific defines are correct for Universal 2 build on macOS (#112828) 2023-12-08 10:09:34 +01:00
pymacro.h [3.13] gh-127906: Fix Py_BUILD_ASSERT_EXPR() on Windows (#127994) 2024-12-16 17:17:01 +00:00
pymath.h gh-104263: Rely on Py_NAN and introduce Py_INFINITY (GH-104202) 2023-05-10 17:44:52 +01:00
pymem.h gh-85283: Add PyMem_RawMalloc() to the limited C API (#108570) 2023-10-17 02:41:51 +02:00
pyport.h [3.13] gh-133256: Add _Py_NONSTRING macro (#133257) (#135135) 2025-06-04 17:10:35 +02:00
pystate.h gh-108867: Add PyThreadState_GetUnchecked() function (#108870) 2023-10-03 16:53:51 +00:00
pystats.h gh-108753: Enhance pystats (#108754) 2023-09-06 15:54:59 +00:00
pystrcmp.h
pystrtod.h gh-106320: Remove private float C API functions (#108430) 2023-08-24 19:09:49 +02:00
Python.h [3.13] gh-136759: revert rename lock.h to pylock.h (GH-137041) (#137075) (#137166) 2025-07-28 12:19:32 +00:00
pythonrun.h gh-102755: PyErr_DisplayException only in ABI >= 3.12. Tests cover PyErr_Display as well (GH-102849) 2023-03-21 10:36:18 +01:00
pythread.h gh-81925: Implement native thread ids for kFreeBSD (#111761) 2023-11-09 21:02:30 +01:00
pytypedefs.h bpo-45459: Fix PyModuleDef_Slot type in the limited C API (GH-31668) 2022-03-03 23:06:55 +01:00
rangeobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
README.rst gh-101101: Unstable C API tier (PEP 689) (GH-101102) 2023-02-28 09:31:01 +01:00
setobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
sliceobject.h gh-115754: Add Py_GetConstant() function (#116883) 2024-03-21 16:07:00 +00:00
structmember.h gh-47146: Soft-deprecate structmember.h, expose its contents via Python.h (GH-99014) 2022-11-22 08:25:43 +01:00
structseq.h gh-106168: PyTuple_SET_ITEM() now checks the index (#106164) 2023-06-28 03:45:57 +02:00
sysmodule.h gh-117987: Restore several functions removed in Python 3.13 alpha 1 (GH-117993) 2024-04-18 15:20:38 +02:00
traceback.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
tupleobject.h gh-87347: Add parenthesis around PyXXX_Check() arguments (#92815) 2022-06-16 13:49:43 +02:00
typeslots.h bpo-45459: Add Py_buffer to limited API (GH-29991) 2022-02-02 07:03:10 -08:00
unicodeobject.h gh-111089: Revert PyUnicode_AsUTF8() changes (#111833) 2023-11-07 22:36:13 +00:00
warnings.h bpo-35134: Split warnings.h and weakrefobject.h (GH-29042) 2021-10-19 01:31:57 +02:00
weakrefobject.h gh-105927: Limit PyWeakref_GetRef() to limited C API 3.13 (#117091) 2024-03-20 23:52:23 +01:00

README.rst 

The Python C API
================

The C API is divided into these sections:

1. ``Include/``: Limited API
2. ``Include/cpython/``: CPython implementation details
3. ``Include/cpython/``, names with the ``PyUnstable_`` prefix: API that can
   change between minor releases
4. ``Include/internal/``, and any name with ``_`` prefix: The internal API

Information on changing the C API is available `in the developer guide`_

.. _in the developer guide: https://devguide.python.org/c-api/