---
id: pr-vllm-21116
repo: vllm-project/vllm
pr: 21116
title: '[perf] Add fused MLA QKV + strided layernorm'
author: mickaelseznec
date: '2025-07-22'
url: https://github.com/vllm-project/vllm/pull/21116
source_category: upstream-code
architectures:
- sm100
tags:
- fp8
- kernel-fusion
- mla
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp8
kernel_types:
- mla
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 4fb56914c5f27ef062e10d44a0f79c6ceab382f9
inclusion_reason: kernel file changes
changed_paths:
- csrc/layernorm_kernels.cu
- csrc/layernorm_quant_kernels.cu
- csrc/quantization/fp8/common.cu
- tests/kernels/core/test_layernorm.py
- vllm/model_executor/layers/linear.py
- vllm/model_executor/layers/quantization/fp8.py
- vllm/model_executor/models/deepseek_v2.py
head_ref_oid: 070dfa4b77e10f75ea466e704f369c941654b7fb
artifact_dir: evidence/pull-bundles/vllm/gh-21116
---
# [perf] Add fused MLA QKV + strided layernorm

- Repository: `vllm-project/vllm`
- PR: [21116](https://github.com/vllm-project/vllm/pull/21116)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/layernorm_kernels.cu`
- `csrc/layernorm_quant_kernels.cu`
- `csrc/quantization/fp8/common.cu`
- `tests/kernels/core/test_layernorm.py`
- `vllm/model_executor/layers/linear.py`
- `vllm/model_executor/layers/quantization/fp8.py`
- `vllm/model_executor/models/deepseek_v2.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21116`
