Mirror per-hugepage backing state in huge_region_fuzz. - #990
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Track used pages and backed status for every hugepage of the region, bracketing each mock unback so hugepages in flight are modelled as fully used exactly as HugeRegion::UnbackHugepages does. After every instruction, used_pages(), backed(), free_backed(), and unmapped_pages() must match the model. MaybeGet must return a range disjoint from live allocations and report from_released iff it touched an unbacked hugepage; Put must unback exactly the hugepages it empties, and only when asked; Release must select the free, backed hugepages HugeRegion::Release's scan order predicts and report exactly the hugepages whose unback succeeded. This replaces the page-level released_ set, which only recorded pages inside allocations. PiperOrigin-RevId: 983554969
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Mirror per-hugepage backing state in huge_region_fuzz.
Track used pages and backed status for every hugepage of the region,
bracketing each mock unback so hugepages in flight are modelled as fully used
exactly as HugeRegion::UnbackHugepages does. After every instruction,
used_pages(), backed(), free_backed(), and unmapped_pages() must match the
model. MaybeGet must return a range disjoint from live allocations and report
from_released iff it touched an unbacked hugepage; Put must unback exactly
the hugepages it empties, and only when asked; Release must select the free,
backed hugepages HugeRegion::Release's scan order predicts and report exactly
the hugepages whose unback succeeded. This replaces the page-level
released_ set, which only recorded pages inside allocations.