Also set `image.mem.shared.unmap.min_threshold_kb` to 0 to more closely mirror the 32-bit behaviour.
Bug 1709679 Comment 26 Edit History
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Also set `image.mem.shared.unmap.min_threshold_kb` to 0 to more closely mirror the 32-bit behaviour. `image.mem.shared.unmap.min_expiration_ms` should be the same on both, but perhaps you can lower the expiration period to be more aggressive about the unmapping to aid reproduction.