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gh-128679: Redesign tracemalloc locking (#128888)

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* Use TABLES_LOCK() to protect 'tracemalloc_config.tracing'.
* Hold TABLES_LOCK() longer while accessing tables.
* tracemalloc_realloc() and tracemalloc_free() no longer
  remove the trace on reentrant call.
* _PyTraceMalloc_Stop() unregisters _PyTraceMalloc_TraceRef().
* _PyTraceMalloc_GetTraces() sets the reentrant flag.
* tracemalloc_clear_traces_unlocked() sets the reentrant flag.
This commit is contained in:
Victor Stinner 2025-01-15 21:22:44 +01:00 • committed by GitHub
parent 080f444a58
commit 36c5e3bcc2
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5 changed files with 302 additions and 364 deletions
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6
Include/internal/pycore_object.h
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@ -299,12 +299,6 @@ Py_ssize_t _Py_ExplicitMergeRefcount(PyObject *op, Py_ssize_t extra);
extern int _PyType_CheckConsistency(PyTypeObject *type);
extern int _PyDict_CheckConsistency(PyObject *mp, int check_content);
/* Update the Python traceback of an object. This function must be called
when a memory block is reused from a free list.
Internal function called by _Py_NewReference(). */
extern int _PyTraceMalloc_TraceRef(PyObject *op, PyRefTracerEvent event, void*);
// Fast inlined version of PyType_HasFeature()
static inline int
_PyType_HasFeature(PyTypeObject *type, unsigned long feature) {