---
id: pr-flash-attention-1331
repo: Dao-AILab/flash-attention
pr: 1331
title: 'FA3 paged attention: Readiness for Cutlass 3.6 / default value for block_table'
author: kadeng
date: '2024-11-12'
url: https://github.com/Dao-AILab/flash-attention/pull/1331
source_category: upstream-code
architectures:
- sm90
tags:
- FA3
- arch_pipeline
- attention_kv
- paged
- sm90
- tma
techniques:
- async-copy
- cache-policy
- pipeline-stages
hardware_features:
- hopper
- tma
kernel_types:
- attention
- runtime
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 284e2c6e5beff017996d72de6e028b2dc605acf8
inclusion_reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.
changed_paths:
- hopper/copy_paged_sm90_tma.hpp
- hopper/copy_paged_sm90_tma_cutlass35.hpp
- hopper/copy_paged_sm90_tma_cutlass36.hpp
- hopper/flash_attn_interface.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-1331
head_ref_oid: c5f4810c80abb349944033507d43392ac7f382c1
---
# FA3 paged attention: Readiness for Cutlass 3.6 / default value for block_table

- Repository: `Dao-AILab/flash-attention`
- PR: [1331](https://github.com/Dao-AILab/flash-attention/pull/1331)
- 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

- `hopper/copy_paged_sm90_tma.hpp`
- `hopper/copy_paged_sm90_tma_cutlass35.hpp`
- `hopper/copy_paged_sm90_tma_cutlass36.hpp`
- `hopper/flash_attn_interface.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-1331`
