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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
Lib/test/test_embed.py
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@ -1656,6 +1656,7 @@ class InitConfigTests(EmbeddingTestsMixin, unittest.TestCase):
api=API_PYTHON, env=env)
def test_init_main_interpreter_settings(self):
OBMALLOC = 1<<5
EXTENSIONS = 1<<8
THREADS = 1<<10
DAEMON_THREADS = 1<<11
@ -1664,7 +1665,7 @@ class InitConfigTests(EmbeddingTestsMixin, unittest.TestCase):
expected = {
# All optional features should be enabled.
'feature_flags':
FORK | EXEC | THREADS | DAEMON_THREADS,
OBMALLOC | FORK | EXEC | THREADS | DAEMON_THREADS,
}
out, err = self.run_embedded_interpreter(
'test_init_main_interpreter_settings',