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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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4
Include/cpython/initconfig.h
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@ -245,6 +245,8 @@ PyAPI_FUNC(PyStatus) PyConfig_SetWideStringList(PyConfig *config,
/* --- PyInterpreterConfig ------------------------------------ */
typedef struct {
// XXX "allow_object_sharing"? "own_objects"?
int use_main_obmalloc;
int allow_fork;
int allow_exec;
int allow_threads;
@ -254,6 +256,7 @@ typedef struct {
#define _PyInterpreterConfig_INIT \
{ \
.use_main_obmalloc = 0, \
.allow_fork = 0, \
.allow_exec = 0, \
.allow_threads = 1, \
@ -263,6 +266,7 @@ typedef struct {
#define _PyInterpreterConfig_LEGACY_INIT \
{ \
.use_main_obmalloc = 1, \
.allow_fork = 1, \
.allow_exec = 1, \
.allow_threads = 1, \