---
id: pr-vllm-21137
repo: vllm-project/vllm
pr: 21137
title: '[Attention] Optimize FlashInfer MetadataBuilder Build call'
author: LucasWilkinson
date: '2025-07-24'
url: https://github.com/vllm-project/vllm/pull/21137
source_category: upstream-code
architectures:
- sm100
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 61b8cea3b42feab021d506e9143551de18f9165c
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/attention/test_attention_backends.py
- tests/v1/attention/utils.py
- vllm/v1/attention/backends/flashinfer.py
head_ref_oid: 9723f3d8cfa928d77e7a4f40f8eb106cee9061f4
artifact_dir: evidence/pull-bundles/vllm/gh-21137
---
# [Attention] Optimize FlashInfer MetadataBuilder Build call

- Repository: `vllm-project/vllm`
- PR: [21137](https://github.com/vllm-project/vllm/pull/21137)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/attention/test_attention_backends.py`
- `tests/v1/attention/utils.py`
- `vllm/v1/attention/backends/flashinfer.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21137`
