---
id: pr-vllm-25774
repo: vllm-project/vllm
pr: 25774
title: Fuse RoPE and MLA KV-cache write
author: PatrykSaffer
date: '2026-01-10'
url: https://github.com/vllm-project/vllm/pull/25774
source_category: upstream-code
architectures:
- sm100
tags:
- kernel-fusion
- mla
techniques:
- kernel-fusion
hardware_features: []
kernel_types:
- mla
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 80fead8bf6508b7907a565d05cb0a6aed9101a3d
inclusion_reason: kernel file changes
changed_paths:
- CMakeLists.txt
- csrc/cache.h
- csrc/cache_kernels_fused.cu
- csrc/torch_bindings.cpp
- tests/kernels/core/test_rotary_embedding_mla_cache_fused.py
- vllm/_custom_ops.py
head_ref_oid: e794de49ed411563737dd3de961dede7c5db3a7b
artifact_dir: evidence/pull-bundles/vllm/gh-25774
---
# Fuse RoPE and MLA KV-cache write

- Repository: `vllm-project/vllm`
- PR: [25774](https://github.com/vllm-project/vllm/pull/25774)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `CMakeLists.txt`
- `csrc/cache.h`
- `csrc/cache_kernels_fused.cu`
- `csrc/torch_bindings.cpp`
- `tests/kernels/core/test_rotary_embedding_mla_cache_fused.py`
- `vllm/_custom_ops.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-25774`
