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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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news and lint
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@kevmo314
kevmo314 committed Dec 1, 2025
commit 8d01b65df5a0c21ef68cdfe955f5257190424ae6
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-12-01-20-41-26.gh-issue-142048.c2YosX.rst
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@@ -0,0 +1,2 @@
Fix quadratically increasing garbage collection delays in free-threaded
build.
2 changes: 1 addition & 1 deletion Python/gc_free_threading.c
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Expand Up @@ -2213,7 +2213,7 @@ record_deallocation(PyThreadState *tstate)
int count = _Py_atomic_load_int_relaxed(&gcstate->young.count);
int new_count;
do {
if (count == 0) {
if (count == 0) {
break;
}
new_count = count + (int)gc->alloc_count;
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