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[3.13] gh-142048: Fix quadratically increasing GC delays (gh-142051) (#142167)

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The GC for the free threaded build would get slower with each collection due
to effectively double counting objects freed by the GC.
(cherry picked from commit eb892868b3)

Co-authored-by: Kevin Wang <kevmo314@gmail.com>
This commit is contained in:
Sam Gross 2025-12-01 19:31:36 -05:00 • committed by GitHub
parent 8d920ac1a5
commit 01393ffbe6
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2 changed files with 15 additions and 1 deletions
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14
Python/gc_free_threading.c
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@ -1100,7 +1100,19 @@ record_deallocation(PyThreadState *tstate)
gc->alloc_count--;
if (gc->alloc_count <= -LOCAL_ALLOC_COUNT_THRESHOLD) {
GCState *gcstate = &tstate->interp->gc;
_Py_atomic_add_int(&gcstate->generations[0].count, (int)gc->alloc_count);
int count = _Py_atomic_load_int_relaxed(&gcstate->generations[0].count);
int new_count;
do {
if (count == 0) {
break;
}
new_count = count + (int)gc->alloc_count;
if (new_count < 0) {
new_count = 0;
}
} while (!_Py_atomic_compare_exchange_int(&gcstate->generations[0].count,
&count,
new_count));
gc->alloc_count = 0;
}
}