---
id: pr-flash-attention-2309
repo: Dao-AILab/flash-attention
pr: 2309
title: '[Fwd,Sm100] Extract named barriers'
author: drisspg
date: '2026-03-09'
url: https://github.com/Dao-AILab/flash-attention/pull/2309
source_category: upstream-code
architectures:
- sm100
tags:
- sm100
techniques: []
hardware_features:
- blackwell
kernel_types:
- attention
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 7b1581feb08448d5979adfbbdb9770d8c5572c27
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- flash_attn/cute/flash_fwd_sm100.py
- flash_attn/cute/named_barrier.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2309
head_ref_oid: b3223a35cae4a2f164e63b24f441ab53127b8304
---
# [Fwd,Sm100] Extract named barriers

- Repository: `Dao-AILab/flash-attention`
- PR: [2309](https://github.com/Dao-AILab/flash-attention/pull/2309)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `flash_attn/cute/flash_fwd_sm100.py`
- `flash_attn/cute/named_barrier.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2309`
