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gh-117783: Immortalize objects that use deferred reference counting (#118112)

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Deferred reference counting is not fully implemented yet. As a temporary
measure, we immortalize objects that would use deferred reference
counting to avoid multi-threaded scaling bottlenecks.

This is only performed in the free-threaded build once the first
non-main thread is started. Additionally, some tests, including refleak
tests, suppress this behavior.
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Sam Gross 2024-04-29 14:36:02 -04:00 • committed by GitHub
parent 8d4b756fd3
commit 7ccacb220d
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13 changed files with 134 additions and 8 deletions
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11
Python/pystate.c
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@ -1568,6 +1568,17 @@ new_threadstate(PyInterpreterState *interp, int whence)
// Must be called with lock unlocked to avoid re-entrancy deadlock.
PyMem_RawFree(new_tstate);
}
else {
#ifdef Py_GIL_DISABLED
if (interp->gc.immortalize.enable_on_thread_created &&
!interp->gc.immortalize.enabled)
{
// Immortalize objects marked as using deferred reference counting
// the first time a non-main thread is created.
_PyGC_ImmortalizeDeferredObjects(interp);
}
#endif
}
#ifdef Py_GIL_DISABLED
// Must be called with lock unlocked to avoid lock ordering deadlocks.