LOCKS: Page-Local Compact Key Summaries for Efficient Long-Context Decoding
Serving large language models at long context is bottlenecked by the key-value (KV) cache, which is read at every decode step. We find that attention keys are approximately low-rank within pages. A single low-rank projection shared across pages can miss page-specific directions; fitting a basis to each page better identifies the pages receiving the most attention at comparable stored selector cost. LOCKS stores a rank-$r$ spectral summary per page, reconstructs its within-page logits, and selects pages by log-sum-exp mass without reading candidate keys or values. It stays within about a point of FullKV on LongBench-v1, tracks the read-every-key exact-LSE oracle on RULER down to the smalle...
| Authors | Junsung Hwang |
|---|---|
| Primary category | cs.LG |
| Published | 27 July 2026 |
| Last updated at source | 29 September 2026 |
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