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gh-101659: Isolate "obmalloc" State to Each Interpreter (gh-101660)

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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.
This commit is contained in:
Eric Snow 2023-04-24 17:23:57 -06:00 • committed by GitHub
parent 01be52e42e
commit df3173d28e
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20 changed files with 322 additions and 73 deletions
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3
Include/internal/pycore_runtime_init.h
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@ -29,7 +29,7 @@ extern PyTypeObject _PyExc_MemoryError;
_pymem_allocators_debug_INIT, \
_pymem_allocators_obj_arena_INIT, \
}, \
.obmalloc = _obmalloc_state_INIT(runtime.obmalloc), \
.obmalloc = _obmalloc_global_state_INIT, \
.pyhash_state = pyhash_state_INIT, \
.signals = _signals_RUNTIME_INIT, \
.interpreters = { \
@ -93,6 +93,7 @@ extern PyTypeObject _PyExc_MemoryError;
{ \
.id_refcount = -1, \
.imports = IMPORTS_INIT, \
.obmalloc = _obmalloc_state_INIT(INTERP.obmalloc), \
.ceval = { \
.recursion_limit = Py_DEFAULT_RECURSION_LIMIT, \
}, \