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gh-142048: Fix quadratically increasing GC delays #142051

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Merged
colesbury merged 8 commits into from
Dec 2, 2025
Merged

gh-142048: Fix quadratically increasing GC delays #142051

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a9edb7b
reset allocation counts in gc thread-local buffers
kevmo314 Nov 28, 2025
b1a6c16
Merge branch 'main' into fix-gc-alloc-count-negative
kevmo314 Nov 30, 2025
9388518
Fix allocation count decrement and GC state update
kevmo314 Dec 1, 2025
f5e46b5
Fix formatting in gc_free_threading.c
kevmo314 Dec 1, 2025
795e703
Update Python/pystate.c
kevmo314 Dec 1, 2025
8d01b65
news and lint
kevmo314 Dec 1, 2025
8be49b5
Remove local GC allocation count flush in pystate.c
kevmo314 Dec 1, 2025
f202991
Merge branch 'main' into fix-gc-alloc-count-negative
kevmo314 Dec 1, 2025
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Update Python/pystate.c 
Co-authored-by: Sam Gross <[email protected]>
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@kevmo314 @colesbury
kevmo314 and colesbury authored Dec 1, 2025
commit 795e703759b4928edd7dc87a161fe5e3ad35d6e9
4 changes: 2 additions & 2 deletions Python/pystate.c
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Expand Up @@ -1814,8 +1814,8 @@ tstate_delete_common(PyThreadState *tstate, int release_gil)
// Flush the thread's local GC allocation count to the global count
// before the thread state is deleted, otherwise the count is lost.
_Py_atomic_add_int(&tstate->interp->gc.young.count,
(int)((_PyThreadStateImpl *)tstate)->gc.alloc_count);
((_PyThreadStateImpl *)tstate)->gc.alloc_count = 0;
(int)tstate_impl->gc.alloc_count);
tstate_impl->gc.alloc_count = 0;
#endif

#if _Py_TIER2
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