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Matteo Collina
0f5cb92cf3
Read buffers for streams that emit their data to JS were allocated per read: a 64KB backing store, tracked in a map, and then - since reads rarely fill the whole buffer - reallocated to the right size and copied. Allocate read buffers from a 64KB slab instead. Reads reserve the suggested size from the slab and JS receives a view over the slab's ArrayBuffer at the read's offset, using the offset mechanism that onStreamRead already supports. Unused reservation space is rewound when a read returns less than was reserved, so small reads (e.g. TLS records) share a slab. This removes the per-read allocations, the map bookkeeping and the resize copy. Signed-off-by: Matteo Collina <hello@matteocollina.com> PR-URL: https://github.com/nodejs/node/pull/64455 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Robert Nagy <ronagy@icloud.com>