[turbopack] Reduce persistence buffer lifetimes#92413
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[turbopack] Reduce persistence buffer lifetimes#92413lukesandberg wants to merge 2 commits intographite-base/92413from
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deserialize directly into the TaskStorage struct in the in memory cache this means we need to hold the shard lock while doing it, but we save a bunch of temporary memory allocations from the snapshots
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What?
Refactor the task restore path to decode persisted bytes directly into the live in-memory
TaskStorage, rather than first decoding into a scratchTaskStorageand then copying the fields across.Also introduces
batch_get_with— a streaming callback-based batch lookup that resolves and delivers each value immediately rather than accumulating all decoded values simultaneously.Why?
The old path allocated a scratch
TaskStorageper task, decoded into it, then calledrestore_fromto copy persisted fields into the live task. For large batches (up to 50K tasks) this meant holding every decoded value in memory at once.The new path:
TaskStorageallocation per taskrestore_from/restore_meta_from/restore_data_fromfamily of methods from theTaskStoragemacro, which were the only consumers of this patternAlso switches
batch_getfrom returningVec<Option<ArcBytes>>to a streamingbatch_get_with(callback)interface, and replaces theValueBuffer<'l>associated type onKeyValueDatabasewith a concreteArcBytesreturn type.How?
turbo-persistence: addbatch_get_withonTurboPersistenceandKeyValueDatabase;batch_lookup_withonMetaFilenow takes aFoundBitsetand fires a callback per resolved entry rather than storingLookupValuein the cells vecBackingStorage:lookup_datareturnsOption<ArcBytes>(raw bytes);batch_lookup_datatakes a&mut dyn FnMut(usize, Option<&[u8]>)callbackkv_backing_storage: decode removed from the lookup path; callers decode directly usingnew_turbo_bincode_decoderoperation/mod.rs: newrestore_batchhelper handles single and batch cases uniformly;process_taskclosure decodes into live storage and firesprepared_task_callbackinline without a second passtask_storage_macro.rs: removerestore_fromand related generated methods