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[Refactor] Extract _bucket_layers_by_page_size from DSV4 KV cache config#166

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LucasWilkinson wants to merge 12 commits into
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lwilkinson/kv-layout/bucket-layers-refactor
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[Refactor] Extract _bucket_layers_by_page_size from DSV4 KV cache config#166
LucasWilkinson wants to merge 12 commits into
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lwilkinson/kv-layout/bucket-layers-refactor

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Summary

  • Extracts reusable _bucket_layers_by_page_size() utility from _get_kv_cache_config_deepseek_v4() in vllm/v1/core/kv_cache_utils.py
  • Simplifies _pool_bytes_per_block() DSV4 branch by deriving page_sizes and num_layer_tuples from the buckets dict
  • Behavior-preserving: same allocation pattern, same shared_by lists, same test results

Context

Preliminary refactoring for upstream PR vllm-project#42374 (Standardized KV cache layout). Splitting the large PR into smaller, independently-landable pieces to reduce the final diff.

Test plan

  • pytest tests/v1/core/test_kv_cache_utils.py -v — all 57 tests pass
  • pytest tests/v1/core/test_prefix_caching.py -v — all 64 tests pass
  • ruff check and ruff format pass
  • All pre-commit hooks pass

🤖 Generated with Claude Code

shen-shanshan and others added 12 commits June 3, 2026 01:20
Signed-off-by: shen-shanshan <467638484@qq.com>
Signed-off-by: wzhao18 <wzhao18.sz@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
…pe (vllm-project#43759)

Signed-off-by: Yan Ma <yan.ma@intel.com>
Co-authored-by: Kunshang Ji <kunshang.ji@intel.com>
…offloading connector (vllm-project#42212)

Signed-off-by: Itay Etelis <itay.etelis@ibm.com>
Co-authored-by: Itay Etelis <itay.etelis@ibm.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Signed-off-by: varun sundar rabindranath <vsundarr@redhat.com>
Co-authored-by: varun sundar rabindranath <vsundarr@redhat.com>
Signed-off-by: xunzhuo <xunzhuo@vllm-semantic-router.ai>
Signed-off-by: Bugen Zhao <i@bugenzhao.com>
Co-authored-by: Bugen Zhao <i@bugenzhao.com>
Signed-off-by: Wu, Xiaochang <xiaochang.wu@intel.com>
Signed-off-by: Xiaochang Wu <xiaochang.wu@intel.com>
Co-authored-by: Yuxiang <yuxiang.liang@intel.com>
Co-authored-by: Kunshang Ji <kunshang.ji@intel.com>
Extract reusable bucketing logic from _get_kv_cache_config_deepseek_v4
into _bucket_layers_by_page_size(). This simplifies the DSV4 config
builder and _pool_bytes_per_block by deriving page_sizes and
num_layer_tuples directly from the buckets dict.

Behavior-preserving: same allocation pattern, same shared_by lists.

Preliminary refactoring for PR vllm-project#42374.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>
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