2034417 - Investigate doing some buffer allocator sweeping on the main thread rather than allocating a new chunk

Status: NEW

(Core :: JavaScript: GC, enhancement, P5)

Description

[Jon Coppeard (:jonco)]

If we run out of allocated space for the buffer allocator while we're sweeping we could do some of that sweeping on the main thread, rather than allocating a new chunk from the OS. This could reduce the overall amount of memory usage.

Comment 1

[Jon Coppeard (:jonco)]

Attachment: WIP: Bug 2034417 - Sweep on main thread rather than allocating a new chunk if possible

Comment 2

[Jon Coppeard (:jonco)]

I implemented this but it didn't show any improvement in memory use and hurt performance slightly in some benchmarks (crypto, pdfjs and typescript). While I feel this is a good idea I wasn't able to come up with a benchmark where we allocated more memory that necessary without this change so I'm parking it for now.