vllm-project/vllm

[Feature]: Remove attention layer name from `unified_kv_cache_update`

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#33,267 opened on Jan 28, 2026

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 (8 comments) (1 reaction) (2 assignees)Python (16,816 forks)batch import
feature requestgood first issuehelp wantedstalestartup-uxtorch.compile

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Description

🚀 The feature, motivation and pitch

unified_kv_cache_update appears in piecewise cudagraph regions, and each layer has a different name, so each of these have to be compiled separately. This increases cold start compilation time with Dynamo partition because the graphs can no longer be reused.

We should use the same approach as #32805 and #33184 to iterate through the layers in the forward context.

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Contributor guide

Research direction
Refer to previous PRs #32805 and #33184. Iterate through layers in forward context to remove layer name from unified kv cache update to allow graph reuse.
Tech stack
python
Domain
backendperformance
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30