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67c6208b3a
Mirror patch 0006 of the paged-attention series into the vendored llama.cpp patch set. Extends the vendored PagedKVManager (src/paged-kv-manager) with host-side cross-request prefix sharing: place_with_prefix reuses cached physical blocks for a new sequence shared prefix (ref_cnt++) and allocates only the divergent suffix; cow_block copy-on-writes a still-shared (ref>1) block before a divergent write so co-owners stay byte-correct; ref-counted free releases a shared block only at ref 0. Core kv-cache files untouched; gated behind LLAMA_KV_PAGED, default off. Gate 0 verified on the dev tree (CPU, Qwen3-0.6B-Q8_0): shared-prefix greedy tokens byte-identical to the unshared baseline at both a block boundary and mid-block, measured 2-block reuse (ref_cnt==2, only the suffix allocated), and copy-on-write + seq_rm ref-count safety with no use-after-free. Assisted-by: Claude:opus-4.8 [Claude Code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io>