Andreas Kling c2d9cd8d53 LibJS: Implement lazy freelist allocation for cells ...

HeapBlock now implements the same lazy freelist as LibC malloc() does,
where new blocks start out in a "bump allocator" mode that gets used
until we've bump-allocated all the way to the end of the block.

Then we fall back to the old freelist style as before.

This means we don't have to pre-initialize the freelist on HeapBlock
construction. This defers page faults and reduces memory usage for
blocks where all cells don't get used. :^)

2021-05-17 19:30:12 +02:00

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