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cpython/Include/internal
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Sam Gross 6577d870b0
gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 
Align the QSBR thread state array to a 64-byte cache line boundary
and add padding at the end of _PyThreadStateImpl. Depending on heap
layout, the QSBR array could end up sharing a cache line with a
thread's tlbc_index, causing QSBR quiescent state updates to contend
with reads of tlbc_index in RESUME_CHECK. This is sensitive to
earlier allocations during interpreter init and can appear or
disappear with seemingly unrelated changes.

Either change alone is sufficient to fix the specific issue, but both
are worthwhile to avoid similar problems in the future.
2026-02-17 11:12:25 -05:00
..
mimalloc gh-144490: Fix mimalloc debug build for C++ (#144620) 2026-02-10 11:56:52 +01:00
pycore_abstract.h gh-135763: AC: Implement `allow_negative for Py_ssize_t` (#138150) 2025-09-01 22:55:22 +01:00
pycore_asdl.h gh-87347: Add parenthesis around macro arguments (#93915) 2022-06-20 16:04:52 +02:00
pycore_ast.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_ast_state.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_atexit.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_audit.h gh-125604: Move _Py_AuditHookEntry, etc. Out of pycore_runtime.h (gh-125605) 2024-10-18 09:26:08 -06:00
pycore_backoff.h gh-141504: Refactor policy object into a single opt_config (gh-143644) 2026-01-15 09:53:00 +09:00
pycore_bitutils.h gh-108216: Cleanup #include in internal header files (#108228) 2023-08-21 18:05:59 +00:00
pycore_blocks_output_buffer.h gh-139877: Use PyBytesWriter in pycore_blocks_output_buffer.h (#139976) 2025-10-14 10:03:55 -07:00
pycore_brc.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_bytes_methods.h gh-71679: Share the repr implementation between bytes and bytearray (GH-138181) 2025-09-17 11:10:29 +03:00
pycore_bytesobject.h gh-139871: Add bytearray.take_bytes([n]) to efficiently extract bytes (GH-140128) 2025-11-13 13:19:44 +00:00
pycore_c_array.h gh-130080: move _Py_EnsureArrayLargeEnough to a separate header so it can be used outside of the compiler (#130930) 2025-03-13 16:02:58 +00:00
pycore_call.h gh-142217: Remove internal _Py_Identifier functions (#142219) 2025-12-03 14:33:32 +01:00
pycore_capsule.h gh-108240: Add pycore_capsule.h internal header file (#108596) 2023-08-29 01:20:02 +00:00
pycore_cell.h gh-144490: Fix C++ compatibility in pycore_cell.h (GH-144482) 2026-02-06 22:11:58 -05:00
pycore_ceval.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_ceval_state.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_code.h gh-144289: Remove ENABLE_SPECIALIZATION_FT (gh-144290) 2026-01-27 17:52:50 -05:00
pycore_codecs.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_compile.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_complexobject.h gh-128813: hide mixed-mode functions for complex arithmetic from C-API (#131703) 2025-04-22 14:18:18 +02:00
pycore_condvar.h gh-131082: Add missing guards for WIN32_LEAN_AND_MEAN (#131044) 2025-03-11 12:33:01 +01:00
pycore_context.h gh-140414: streamline thread state access in asyncio (#142742) 2025-12-15 16:57:51 +05:30
pycore_critical_section.h gh-140795: fetch thread state once on fast path for critical sections (#141406) 2025-11-21 19:49:53 +05:30
pycore_crossinterp.h gh-132775: Clean Up Cross-Interpreter Error Handling (gh-135369) 2025-06-13 16:45:21 -06:00
pycore_crossinterp_data_registry.h gh-132775: Support Fallbacks in _PyObject_GetXIData() (gh-133482) 2025-05-21 07:23:48 -06:00
pycore_debug_offsets.h gh-138122: Add exception profiling mode to the sampling profiler (#142561) 2025-12-11 20:46:34 +00:00
pycore_descrobject.h gh-41779: Allow defining any __slots__ for a class derived from tuple (GH-141763) 2026-01-06 11:36:00 +02:00
pycore_dict.h gh-141510, PEP 814: Add built-in frozendict type (#144757) 2026-02-17 10:54:41 +01:00
pycore_dict_state.h gh-124296: Remove private dictionary version tag (PEP 699) (#124472) 2024-10-01 12:39:56 -04:00
pycore_dtoa.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_emscripten_signal.h GH-108614: Unbreak emscripten build (GH-109132) 2023-09-08 17:54:45 +01:00
pycore_emscripten_trampoline.h gh-132097: use a macro for semantically casting function pointers (#132406) 2025-04-18 12:24:34 +02:00
pycore_exceptions.h gh-129668: Fix thread-safety of MemoryError freelist in free threaded build (gh-129704) 2025-02-06 12:38:12 -05:00
pycore_faulthandler.h gh-127604: Add C stack dumps to faulthandler (#128159) 2025-04-21 20:48:02 +01:00
pycore_fileutils.h gh-131238: Use pycore_interp_structs.h header (#131481) 2025-03-19 23:13:25 +00:00
pycore_fileutils_windows.h gh-108220: Internal header files require Py_BUILD_CORE to be defined (#108221) 2023-08-21 19:15:52 +02:00
pycore_floatobject.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_flowgraph.h GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
pycore_format.h gh-104018: remove unused format "z" handling in string formatfloat() (#104107) 2023-05-07 10:11:42 +05:30
pycore_frame.h gh-120321: Add gi_state, cr_state, and ag_state attributes (gh-144409) 2026-02-03 13:06:32 -05:00
pycore_freelist.h gh-140544: store pointer to interpreter state as a thread local for fast access (#140573) 2025-10-25 19:56:07 +05:30
pycore_freelist_state.h gh-129813, PEP 782: Add PyBytesWriter C API (#138822) 2025-09-12 13:41:59 +02:00
pycore_function.h remove unused _PyFunction_LookupByVersion (GH-144814) 2026-02-14 14:09:01 +00:00
pycore_gc.h GH-139951: Fix major GC performance regression (GH-140262) 2025-10-21 15:22:15 +01:00
pycore_genobject.h gh-120321: Make gen.gi_frame.clear() thread-safe (gh-143112) 2026-01-08 14:45:54 -05:00
pycore_getopt.h bpo-36763: Cleanup precmdline in _PyCoreConfig_Read() (GH-13371) 2019-05-17 03:15:12 +02:00
pycore_gil.h gh-116322: Enable the GIL while loading C extension modules (#118560) 2024-05-06 23:07:23 -04:00
pycore_global_objects.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_global_objects_fini_generated.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_global_strings.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_hamt.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_hashtable.h gh-107211: No longer export internal functions (5) (#108423) 2023-08-24 16:06:53 +00:00
pycore_import.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_importdl.h gh-141169: Re-raise exception from findfuncptr (GH-141349) 2025-11-11 13:52:13 +01:00
pycore_index_pool.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_initconfig.h gh-116749: Fix code comment for _PyConfig_GIL_DEFAULT (gh-141804) 2025-11-24 10:42:00 -05:00
pycore_instruction_sequence.h GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
pycore_instruments.h gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911) 2026-01-16 10:33:29 -08:00
pycore_interp.h gh-131238: Remove includes from pycore_interp.h (#131495) 2025-03-20 11:35:23 +00:00
pycore_interp_structs.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_interpframe.h gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911) 2026-01-16 10:33:29 -08:00
pycore_interpframe_structs.h GH-140643: Add <native> and <GC> frames to the sampling profiler (#141108) 2025-11-17 13:39:00 +00:00
pycore_interpolation.h gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
pycore_intrinsics.h gh-116126: Implement PEP 696 (#116129) 2024-05-03 06:17:32 -07:00
pycore_jit.h GH-126910: add test for manual frame unwinding (#144137) 2026-01-27 13:17:40 +00:00
pycore_lazyimportobject.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_list.h gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911) 2026-01-16 10:33:29 -08:00
pycore_llist.h gh-111964: Implement stop-the-world pauses (gh-112471) 2024-01-23 11:08:23 -07:00
pycore_lock.h gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292) 2026-01-30 12:20:27 -05:00
pycore_long.h gh-129813, PEP 782: Use PyBytesWriter in _PyBytes_FormatEx() (#138839) 2025-09-15 12:23:36 +02:00
pycore_magic_number.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_memoryobject.h gh-132776: Revert Moving memoryview XIData Code to memoryobject.c (gh-132960) 2025-04-25 16:43:50 +00:00
pycore_mimalloc.h gh-122584: Import mimalloc headers in a C++ context (#122587) 2024-08-15 09:01:01 -04:00
pycore_mmap.h gh-142419: Add mmap.set_name method for user custom annotation (gh-142480) 2025-12-18 23:33:49 +09:00
pycore_modsupport.h gh-129594: Remove redundant check on varargs in _PyArg_CheckPositional (#129595) 2025-05-26 10:51:12 +02:00
pycore_moduleobject.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_namespace.h gh-107211: No longer export internal functions (4) (#107217) 2023-07-25 03:16:28 +00:00
pycore_object.h gh-139103: Improve namedtuple scaling in free-threaded build (gh-144332) 2026-02-06 09:43:05 -05:00
pycore_object_alloc.h gh-112529: Use GC heaps for GC allocations in free-threaded builds (gh-114157) 2024-01-21 01:14:45 +09:00
pycore_object_deferred.h gh-117139: Convert the evaluation stack to stack refs (#118450) 2024-06-27 03:10:43 +08:00
pycore_object_stack.h gh-125859: Fix crash when gc.get_objects is called during GC (#125882) 2024-10-24 09:33:11 -04:00
pycore_object_state.h gh-125604: Move _Py_AuditHookEntry, etc. Out of pycore_runtime.h (gh-125605) 2024-10-18 09:26:08 -06:00
pycore_obmalloc.h gh-144319: Add huge pages support for pymalloc (#144320) 2026-01-29 12:26:11 +00:00
pycore_obmalloc_init.h gh-113055: Use pointer for interp->obmalloc state (gh-113412) 2024-01-26 19:38:14 -08:00
pycore_opcode_metadata.h gh-134584: Optimize _BINARY_OP_SUBSCR_LIST_SLICE (GH-144659) 2026-02-10 22:33:32 +08:00
pycore_opcode_utils.h gh-142863: optimize list and set calls with generator expressions (#142864) 2026-01-06 23:23:28 +05:30
pycore_optimizer.h GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
pycore_optimizer_types.h GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
pycore_parking_lot.h gh-110850: Cleanup pycore_time.h includes (#115724) 2024-02-20 16:50:43 +00:00
pycore_parser.h gh-122581: Use parser mutex in default build for subinterpreters (gh-142959) 2025-12-20 15:37:31 -05:00
pycore_pathconfig.h gh-107211: No longer export internal functions (6) (#108424) 2023-08-24 17:28:35 +02:00
pycore_pyarena.h gh-107211: Fix test_peg_generator (#108435) 2023-08-24 17:47:44 +00:00
pycore_pyatomic_ft_wrappers.h gh-120321: Make gi_frame_state transitions atomic in FT build (gh-142599) 2025-12-19 19:10:37 +00:00
pycore_pybuffer.h gh-76785: Rename _xxsubinterpreters to _interpreters (gh-117791) 2024-04-24 16:18:24 +00:00
pycore_pyerrors.h gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911) 2026-01-16 10:33:29 -08:00
pycore_pyhash.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_pylifecycle.h gh-136421: Load _datetime static types during interpreter initialization (GH-136583) 2025-07-21 13:47:26 -04:00
pycore_pymath.h gh-142342: Fix m68k assembler operand constraints for %fpcr access (gh-142343) 2025-12-09 13:46:40 +00:00
pycore_pymem.h gh-116008: Detect freed thread state in faulthandler (#141988) 2025-11-27 12:35:00 +01:00
pycore_pymem_init.h gh-115103: Implement delayed free mechanism for free-threaded builds (#115367) 2024-02-20 13:04:37 -05:00
pycore_pystate.h GH-139914: Handle stack growth direction on HPPA (GH-140028) 2025-11-17 14:41:22 +01:00
pycore_pystats.h gh-131253: free-threaded build support for pystats (gh-137189) 2025-11-03 11:36:37 -08:00
pycore_pythonrun.h gh-140222: Increase stack margin on debug build (#142452) 2025-12-09 16:25:46 +01:00
pycore_pythread.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_qsbr.h gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 2026-02-17 11:12:25 -05:00
pycore_range.h gh-89189: More compact range iterator (GH-27986) 2022-11-30 23:04:30 +02:00
pycore_runtime.h gh-131238: Use pycore_interp_structs.h header (#131481) 2025-03-19 23:13:25 +00:00
pycore_runtime_init.h gh-131185: Use a proper thread-local for cached thread states (gh-132510) 2025-05-21 07:01:25 -06:00
pycore_runtime_init_generated.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_runtime_structs.h gh-144319: Fix huge page safety in pymalloc arenas (#144331) 2026-01-30 18:18:56 +00:00
pycore_semaphore.h gh-137433: Fix deadlock with stop-the-world and daemon threads (gh-137735) 2025-09-16 09:21:58 +01:00
pycore_setobject.h gh-130312: SET_ADD should not lock (#130136) 2025-03-21 15:58:32 -07:00
pycore_signal.h gh-109693: Use pyatomic.h for signal module (gh-110480) 2023-10-10 08:26:29 +09:00
pycore_sliceobject.h GH-115802: JIT "small" code for Windows (GH-115964) 2024-02-29 08:11:28 -08:00
pycore_stackref.h gh-142472: Clean-up _PyStackRef functions (gh-142479) 2025-12-15 12:03:49 -05:00
pycore_stats.h gh-131253: free-threaded build support for pystats (gh-137189) 2025-11-03 11:36:37 -08:00
pycore_strhex.h gh-107211: No longer export pycore_strhex.h functions (#108229) 2023-08-21 18:12:22 +00:00
pycore_structs.h GH-131498: Cases generator: manage stacks automatically (GH-132074) 2025-04-04 17:59:36 +01:00
pycore_structseq.h gh-107211: No longer export internal functions (4) (#107217) 2023-07-25 03:16:28 +00:00
pycore_symtable.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_sysmodule.h gh-108512: Add and use new replacements for PySys_GetObject() (GH-111035) 2025-05-28 20:11:09 +03:00
pycore_template.h gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
pycore_time.h Remove internal _PyTime_AsLong() function (#141053) 2025-11-05 18:37:06 +01:00
pycore_token.h gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
pycore_traceback.h gh-125434: Display thread name in faulthandler on Windows (#140675) 2025-10-27 18:41:18 +01:00
pycore_tracemalloc.h gh-143057: avoid locking in tracemalloc C-APIs when it is not enabled (#143065) 2025-12-22 21:08:07 +05:30
pycore_tstate.h gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 2026-02-17 11:12:25 -05:00
pycore_tuple.h gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
pycore_typedefs.h gh-130931: Add pycore_typedefs.h internal header (#131396) 2025-03-19 15:23:32 +01:00
pycore_typeobject.h gh-141510, PEP 814: Add built-in frozendict type (#144757) 2026-02-17 10:54:41 +01:00
pycore_typevarobject.h gh-119180: Add evaluate functions for type params and type aliases (#122212) 2024-07-27 17:24:10 +00:00
pycore_ucnhash.h gh-111972: Make Unicode name C APIcapsule initialization thread-safe (#112249) 2023-11-30 11:12:49 +01:00
pycore_unicodectype.h gh-129117: Add unicodedata.isxidstart() function (#140269) 2025-10-30 10:18:12 +00:00
pycore_unicodeobject.h gh-142217: Remove internal _Py_Identifier functions (#142219) 2025-12-03 14:33:32 +01:00
pycore_unicodeobject_generated.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_unionobject.h gh-105499: Merge typing.Union and types.UnionType (#105511) 2025-03-04 11:44:19 -08:00
pycore_uniqueid.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_uop.h GH-139109: Partial reworking of JIT data structures (GH-144105) 2026-01-22 10:55:49 +00:00
pycore_uop_ids.h gh-134584: Optimize _BINARY_OP_SUBSCR_LIST_SLICE (GH-144659) 2026-02-10 22:33:32 +08:00
pycore_uop_metadata.h gh-134584: Optimize _BINARY_OP_SUBSCR_LIST_SLICE (GH-144659) 2026-02-10 22:33:32 +08:00
pycore_warnings.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_weakref.h gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) 2025-06-30 11:14:31 +00:00