---
id: pr-vllm-21412
repo: vllm-project/vllm
pr: 21412
title: '[v1][attention] Support Hybrid Allocator + FlashInfer'
author: heheda12345
date: '2025-07-30'
url: https://github.com/vllm-project/vllm/pull/21412
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- decode
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- decode
- mla
languages:
- triton
captured_at: '2026-04-27'
status: merged
merge_sha: 555e7225bcb9cdf9b037ce064e48987dbc3e13a0
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/attention/test_attention_backends.py
- tests/v1/spec_decode/test_eagle.py
- tests/v1/worker/test_gpu_model_runner.py
- vllm/config.py
- vllm/v1/attention/backends/cpu_attn.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/flashinfer.py
- vllm/v1/attention/backends/flex_attention.py
- vllm/v1/attention/backends/mamba_attn.py
- vllm/v1/attention/backends/mla/common.py
- vllm/v1/attention/backends/mla/flashmla.py
- vllm/v1/attention/backends/mla/rocm_aiter_mla.py
- vllm/v1/attention/backends/rocm_aiter_fa.py
- vllm/v1/attention/backends/triton_attn.py
- vllm/v1/attention/backends/utils.py
- vllm/v1/worker/gpu_model_runner.py
head_ref_oid: 46f1416a16fd99d353778fe3c05cdbff83f038bb
artifact_dir: evidence/pull-bundles/vllm/gh-21412
---
# [v1][attention] Support Hybrid Allocator + FlashInfer

- Repository: `vllm-project/vllm`
- PR: [21412](https://github.com/vllm-project/vllm/pull/21412)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/attention/test_attention_backends.py`
- `tests/v1/spec_decode/test_eagle.py`
- `tests/v1/worker/test_gpu_model_runner.py`
- `vllm/config.py`
- `vllm/v1/attention/backends/cpu_attn.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/flashinfer.py`
- `vllm/v1/attention/backends/flex_attention.py`
- `vllm/v1/attention/backends/mamba_attn.py`
- `vllm/v1/attention/backends/mla/common.py`
- `vllm/v1/attention/backends/mla/flashmla.py`
- `vllm/v1/attention/backends/mla/rocm_aiter_mla.py`
- `vllm/v1/attention/backends/rocm_aiter_fa.py`
- `vllm/v1/attention/backends/triton_attn.py`
- `vllm/v1/attention/backends/utils.py`
- `vllm/v1/worker/gpu_model_runner.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21412`
