Merge train: #9618 (idle-time old-gen reclaim) - #9627
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This was referenced Sep 3, 2026
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Lands #9618 (idle-time old-generation reclaim, #9589):
js_wait_for_eventhands the collector the moment before it parks — an open budgeted cycle is finished there, and after a 3 s quiet window an owed full cycle runs in wake-checked 4 ms slices with rate limiting and exponential backoff on unproductive fulls. The reclaim tail also purges mimalloc so RSS follows reclaimed pages down.Audited against the GC knob kill-policy: the
PERRY_GC_IDLE_RECLAIM=0OFF state has an asserting arm ("must leave the idle heap untouched"), and the ON arm asserts subject liveness (idle_reclaim_completions == Some(1)) with a negative control on the parser — so it is not a gate that cannot fail.Validation:
run_lint_gates.shall 62 gates pass; release build green; RUST_TEST_THREADS=1 perry-runtime 3046/0;issue_9589_idle_reclaim_heap_descends2/2.#9620 was held out of this train for a separate rooting question (reported on that PR).
Rebase-merge preserving authorship.