feat(kvflash): pager serialize/deserialize + critical-chunk pinning#429
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feat(kvflash): pager serialize/deserialize + critical-chunk pinning#429dusterbloom wants to merge 3 commits into
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This was referenced Jun 24, 2026
Add serialize()/deserialize() to KvFlashPager (snapshot the full resident+paged KV in logical chunk order; header-validated against layout) and a factored for_each_segment() helper. serde uses synchronous get/set and adapts to the pinned void* host_data of the async-DMA path (Luce-Org#408). Add critical-chunk pinning (pin_range/is_pinned/unpin_all + a best-effort deadlock floor) OR-ed into the ensure_free_block + reselect protections; empty by default (byte-identical non-pin path). CPU unit test (no GPU) covers serde round-trip, header-guard reject, pinning, deadlock guard, reset.
…OB, UAF, atoi-UB, re-prefill fallback, pin_range, gguf type guards)
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What
Snapshot/restore for the KVFlash pager:
serialize()/deserialize()with afixed-layout header guard (rejects layout drift), plus critical-chunk pinning so
sink/anchor chunks survive eviction (with a deadlock floor that refuses pins that
would starve the eviction pool).
Shape
server/src/common/kvflash_pager.h— header-only addition; backend-agnostic.test_kvflash_pager.cpp(serde round-trip + header-mismatchguard + pin deadlock guard).
Independent of the placement PR; required by the prefill-snapshot PR.