---
id: pr-flash-attention-1999
repo: Dao-AILab/flash-attention
pr: 1999
title: '[Cute,Fwd,Sm100] Support paged attention'
author: timmy-feng
date: '2025-11-14'
url: https://github.com/Dao-AILab/flash-attention/pull/1999
source_category: upstream-code
architectures:
- sm100
tags:
- FA3
- FA4
- arch_pipeline
- attention_kv
- compiler_runtime
- cute dsl
- head_dim
- paged
- tma
techniques:
- async-copy
- pipeline-stages
- warp-specialization
hardware_features:
- blackwell
- tma
kernel_types:
- attention
- compiler
- runtime
languages:
- cuda-cpp
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 5d2cd3bcbaeff6fe1bfc5d0ff489451b0d4827a6
inclusion_reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.
changed_paths:
- flash_attn/cute/flash_fwd_sm100.py
- flash_attn/cute/interface.py
- flash_attn/cute/mask.py
- flash_attn/cute/paged_kv.py
- tests/cute/test_flash_attn.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-1999
head_ref_oid: 3df3e64a225e4e2ba529cfc99d84ba497471c661
---
# [Cute,Fwd,Sm100] Support paged attention

- Repository: `Dao-AILab/flash-attention`
- PR: [1999](https://github.com/Dao-AILab/flash-attention/pull/1999)
- Decision: `Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.`
- Reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.

## Changed Paths

- `flash_attn/cute/flash_fwd_sm100.py`
- `flash_attn/cute/interface.py`
- `flash_attn/cute/mask.py`
- `flash_attn/cute/paged_kv.py`
- `tests/cute/test_flash_attn.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-1999`
