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Malte UblandClaude Opus 5.5
3fcef83d38
An async function called inside LifetimeRegion.run now keeps its region after every await: its fiber records the region that was current at spawn, and the event loop makes that region current while it resumes the fiber. A region is not freed (or attempted) while a fiber that carries it exists, so a region released while its async work is pending keeps taking that work's objects and is freed once the work ends. Before, objects created after an await went to the default region, which is never freed, and kept the request's region allocated for good, so per-request regions in async servers grew without bound. Freed region chunks now go to a per-thread cache (at most 8 MiB resident, the first 256 KiB of each kept cleared, fresh pages past it, no huge-page chunks) instead of being unmapped, so a region per request or per batch no longer maps and faults in new memory every time. Adds the requests.ts region benchmark (concurrent async handlers), corpus 5023 and its region-stats checks, and a chunk-reuse runtime unit check. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>