---
id: pr-vllm-22320
repo: vllm-project/vllm
pr: 22320
title: Add attention sink in attention backends
author: WoosukKwon
date: '2025-08-06'
url: https://github.com/vllm-project/vllm/pull/22320
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 6e20924350e3fed375bc63d55166a303b6f0828a
inclusion_reason: defer
changed_paths:
- vllm/attention/ops/chunked_prefill_paged_decode.py
- vllm/attention/ops/prefix_prefill.py
- vllm/attention/ops/triton_unified_attention.py
- vllm/envs.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/triton_attn.py
- vllm/v1/attention/backends/utils.py
artifact_dir: evidence/pull-bundles/vllm/gh-22320
head_ref_oid: 9a0460164a47bf951c3a54a69c6a3cd4b1d7304b
---
# Add attention sink in attention backends

- Repository: `vllm-project/vllm`
- PR: [22320](https://github.com/vllm-project/vllm/pull/22320)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/attention/ops/chunked_prefill_paged_decode.py`
- `vllm/attention/ops/prefix_prefill.py`
- `vllm/attention/ops/triton_unified_attention.py`
- `vllm/envs.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/triton_attn.py`
- `vllm/v1/attention/backends/utils.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-22320`
