RFR: 8287788: Implement a better allocator for downcalls [v8]

[Matthias Ernst]

On Thu, 23 Jan 2025 12:27:53 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> the shared memory segment is confined on the carrier thread

But is it? When the CarrierThreadLocal is initialized, we may be executing in a VT and Arena.ofConfined will confine to it. We'd need something like an Arena.ofCarrierConfined() to make that work.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23142#discussion_r1926928205