---
id: pr-vllm-29644
repo: vllm-project/vllm
pr: 29644
title: '[Attention] Make `split_decodes_and_prefills(..., require_uniform=True)` support padding'
author: LucasWilkinson
date: '2025-12-09'
url: https://github.com/vllm-project/vllm/pull/29644
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- decode
- prefill
techniques: []
hardware_features: []
kernel_types:
- attention
- decode
- prefill
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: aed846917fee3b27df876d21ade4d3a30d4de402
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/attention/test_attention_splitting.py
- vllm/v1/attention/backends/utils.py
head_ref_oid: 3c5fc6c8515aeae3baee435445ee2cf20b9e622c
artifact_dir: evidence/pull-bundles/vllm/gh-29644
---
# [Attention] Make `split_decodes_and_prefills(..., require_uniform=True)` support padding

- Repository: `vllm-project/vllm`
- PR: [29644](https://github.com/vllm-project/vllm/pull/29644)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/attention/test_attention_splitting.py`
- `vllm/v1/attention/backends/utils.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-29644`
