Expand description
Sub-VM recursive-spawn bench guest with a 64 KiB pinned RO data
mapping. Every recursion level reads (sums) the mapped bytes —
exercising the direct-mapping path landed by Issue #855 part A
(Commit 2). The RO blob lives in .rodata so subsoil auto-
generates a pinned-slot MemoryMapping for it.
When this bench is built into the JIT/javm target it ships a
self-recursive image: each level derive_spawns a fresh sub-VM,
sums the RO data, and CALLs into the child with depth - 1. The
parent’s RO mapping is shared across every child by content
address — Cap::Data pages get refcount-pinned at frame build,
mapped read-only into each frame’s PT, and the cache is hit
exactly once per Image type.