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cpython/Include/internal/pycore_obmalloc_init.h

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gh-81057: Move the Allocators to _PyRuntimeState (gh-99217) The global allocators were stored in 3 static global variables: _PyMem_Raw, _PyMem, and _PyObject. State for the "small block" allocator was stored in another 13. That makes a total of 16 global variables. We are moving all 16 to the _PyRuntimeState struct as part of the work for gh-81057. (If PEP 684 is accepted then we will follow up by moving them all to PyInterpreterState.) https://github.com/python/cpython/issues/81057
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#ifndef Py_INTERNAL_OBMALLOC_INIT_H
#define Py_INTERNAL_OBMALLOC_INIT_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef Py_BUILD_CORE
# error "this header requires Py_BUILD_CORE define"
#endif
/****************************************************/
/* the default object allocator's state initializer */
#define PTA(pools, x) \
((poolp )((uint8_t *)&(pools.used[2*(x)]) - 2*sizeof(pymem_block *)))
#define PT(p, x) PTA(p, x), PTA(p, x)
#define PT_8(p, start) \
PT(p, start), \
PT(p, start+1), \
PT(p, start+2), \
PT(p, start+3), \
PT(p, start+4), \
PT(p, start+5), \
PT(p, start+6), \
PT(p, start+7)
#if NB_SMALL_SIZE_CLASSES <= 8
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0) }
#elif NB_SMALL_SIZE_CLASSES <= 16
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8) }
#elif NB_SMALL_SIZE_CLASSES <= 24
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16) }
#elif NB_SMALL_SIZE_CLASSES <= 32
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24) }
#elif NB_SMALL_SIZE_CLASSES <= 40
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32) }
#elif NB_SMALL_SIZE_CLASSES <= 48
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32), PT_8(p, 40) }
#elif NB_SMALL_SIZE_CLASSES <= 56
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32), PT_8(p, 40), PT_8(p, 48) }
#elif NB_SMALL_SIZE_CLASSES <= 64
# define _obmalloc_pools_INIT(p) \
{ PT_8(p, 0), PT_8(p, 8), PT_8(p, 16), PT_8(p, 24), PT_8(p, 32), PT_8(p, 40), PT_8(p, 48), PT_8(p, 56) }
#else
# error "NB_SMALL_SIZE_CLASSES should be less than 64"
#endif
gh-101659: Isolate "obmalloc" State to Each Interpreter (gh-101660) This is strictly about moving the "obmalloc" runtime state from `_PyRuntimeState` to `PyInterpreterState`. Doing so improves isolation between interpreters, specifically most of the memory (incl. objects) allocated for each interpreter's use. This is important for a per-interpreter GIL, but such isolation is valuable even without it. FWIW, a per-interpreter obmalloc is the proverbial canary-in-the-coalmine when it comes to the isolation of objects between interpreters. Any object that leaks (unintentionally) to another interpreter is highly likely to cause a crash (on debug builds at least). That's a useful thing to know, relative to interpreter isolation.
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#define _obmalloc_global_state_INIT \
gh-81057: Move the Allocators to _PyRuntimeState (gh-99217) The global allocators were stored in 3 static global variables: _PyMem_Raw, _PyMem, and _PyObject. State for the "small block" allocator was stored in another 13. That makes a total of 16 global variables. We are moving all 16 to the _PyRuntimeState struct as part of the work for gh-81057. (If PEP 684 is accepted then we will follow up by moving them all to PyInterpreterState.) https://github.com/python/cpython/issues/81057
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{ \
gh-81057: Move More Globals to _PyRuntimeState (gh-100092) https://github.com/python/cpython/issues/81057
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.dump_debug_stats = -1, \
gh-101659: Isolate "obmalloc" State to Each Interpreter (gh-101660) This is strictly about moving the "obmalloc" runtime state from `_PyRuntimeState` to `PyInterpreterState`. Doing so improves isolation between interpreters, specifically most of the memory (incl. objects) allocated for each interpreter's use. This is important for a per-interpreter GIL, but such isolation is valuable even without it. FWIW, a per-interpreter obmalloc is the proverbial canary-in-the-coalmine when it comes to the isolation of objects between interpreters. Any object that leaks (unintentionally) to another interpreter is highly likely to cause a crash (on debug builds at least). That's a useful thing to know, relative to interpreter isolation.
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}
#define _obmalloc_state_INIT(obmalloc) \
{ \
gh-81057: Move the Allocators to _PyRuntimeState (gh-99217) The global allocators were stored in 3 static global variables: _PyMem_Raw, _PyMem, and _PyObject. State for the "small block" allocator was stored in another 13. That makes a total of 16 global variables. We are moving all 16 to the _PyRuntimeState struct as part of the work for gh-81057. (If PEP 684 is accepted then we will follow up by moving them all to PyInterpreterState.) https://github.com/python/cpython/issues/81057
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.pools = { \
.used = _obmalloc_pools_INIT(obmalloc.pools), \
}, \
}
#ifdef __cplusplus
}
#endif
#endif // !Py_INTERNAL_OBMALLOC_INIT_H